/**
* Clear color index buffer with masking.
*/
static void
clear_ci_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
{
const GLint x = ctx->DrawBuffer->_Xmin;
const GLint y = ctx->DrawBuffer->_Ymin;
const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
SWspan span;
GLint i;
ASSERT(!ctx->Visual.rgbMode);
ASSERT(rb->PutRow);
ASSERT(rb->DataType == GL_UNSIGNED_INT);
/* Initialize index span with clear index */
INIT_SPAN(span, GL_BITMAP);
span.end = width;
span.arrayMask = SPAN_INDEX;
for (i = 0; i < width;i++) {
span.array->index[i] = ctx->Color.ClearIndex;
}
/* Note that masking will change the color indexes, but only the
* bits for which the write mask is GL_FALSE. The bits
* which are write-enabled won't get modified.
*/
for (i = 0; i < height;i++) {
span.x = x;
span.y = y + i;
_swrast_mask_ci_span(ctx, rb, &span);
/* write masked row */
rb->PutRow(ctx, rb, width, x, y + i, span.array->index, NULL);
}
}
/**
* Clear the color buffer when glColorMask is in effect.
*/
static void
clear_rgba_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
{
const GLint x = ctx->DrawBuffer->_Xmin;
const GLint y = ctx->DrawBuffer->_Ymin;
const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
SWspan span;
GLint i;
ASSERT(ctx->Visual.rgbMode);
ASSERT(rb->PutRow);
/* Initialize color span with clear color */
/* XXX optimize for clearcolor == black/zero (bzero) */
INIT_SPAN(span, GL_BITMAP, width, 0, SPAN_RGBA);
span.array->ChanType = rb->DataType;
if (span.array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte clearColor[4];
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[RCOMP], ctx->Color.ClearColor[0]);
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[GCOMP], ctx->Color.ClearColor[1]);
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[BCOMP], ctx->Color.ClearColor[2]);
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[ACOMP], ctx->Color.ClearColor[3]);
for (i = 0; i < width; i++) {
COPY_4UBV(span.array->rgba[i], clearColor);
}
}
else if (span.array->ChanType == GL_UNSIGNED_SHORT) {
GLushort clearColor[4];
UNCLAMPED_FLOAT_TO_USHORT(clearColor[RCOMP], ctx->Color.ClearColor[0]);
UNCLAMPED_FLOAT_TO_USHORT(clearColor[GCOMP], ctx->Color.ClearColor[1]);
UNCLAMPED_FLOAT_TO_USHORT(clearColor[BCOMP], ctx->Color.ClearColor[2]);
UNCLAMPED_FLOAT_TO_USHORT(clearColor[ACOMP], ctx->Color.ClearColor[3]);
for (i = 0; i < width; i++) {
COPY_4V(span.array->rgba[i], clearColor);
}
}
else {
ASSERT(span.array->ChanType == GL_FLOAT);
for (i = 0; i < width; i++) {
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][0], ctx->Color.ClearColor[0]);
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][1], ctx->Color.ClearColor[1]);
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][2], ctx->Color.ClearColor[2]);
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][3], ctx->Color.ClearColor[3]);
}
}
/* Note that masking will change the color values, but only the
* channels for which the write mask is GL_FALSE. The channels
* which which are write-enabled won't get modified.
*/
for (i = 0; i < height; i++) {
span.x = x;
span.y = y + i;
_swrast_mask_rgba_span(ctx, rb, &span);
/* write masked row */
rb->PutRow(ctx, rb, width, x, y + i, span.array->rgba, NULL);
}
}
/*
* Draw color index image.
*/
static void
draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels )
{
const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
GLint row, skipPixels;
struct sw_span span;
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_INDEX);
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (ctx->Fog.Enabled)
_swrast_span_default_fog(ctx, &span);
/*
* General solution
*/
skipPixels = 0;
while (skipPixels < width) {
const GLint spanX = x + (zoom ? 0 : skipPixels);
GLint spanY = y;
const GLint spanEnd = (width - skipPixels > MAX_WIDTH)
? MAX_WIDTH : (width - skipPixels);
ASSERT(spanEnd <= MAX_WIDTH);
for (row = 0; row < height; row++, spanY++) {
const GLvoid *source = _mesa_image_address2d(unpack, pixels,
width, height,
GL_COLOR_INDEX, type,
row, skipPixels);
_mesa_unpack_index_span(ctx, spanEnd, GL_UNSIGNED_INT,
span.array->index, type, source, unpack,
ctx->_ImageTransferState);
/* These may get changed during writing/clipping */
span.x = spanX;
span.y = spanY;
span.end = spanEnd;
if (zoom)
_swrast_write_zoomed_index_span(ctx, &span, y, skipPixels);
else
_swrast_write_index_span(ctx, &span);
}
skipPixels += spanEnd;
}
}
/*
* Draw color index image.
*/
static void
draw_index_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels )
{
const GLint imgX = x, imgY = y;
const GLboolean zoom = ctx->Pixel.ZoomX!=1.0 || ctx->Pixel.ZoomY!=1.0;
GLint row, skipPixels;
SWspan span;
INIT_SPAN(span, GL_BITMAP);
span.arrayMask = SPAN_INDEX;
_swrast_span_default_attribs(ctx, &span);
/*
* General solution
*/
skipPixels = 0;
while (skipPixels < width) {
const GLint spanWidth = MIN2(width - skipPixels, MAX_WIDTH);
ASSERT(spanWidth <= MAX_WIDTH);
for (row = 0; row < height; row++) {
const GLvoid *source = _mesa_image_address2d(unpack, pixels,
width, height,
GL_COLOR_INDEX, type,
row, skipPixels);
_mesa_unpack_index_span(ctx, spanWidth, GL_UNSIGNED_INT,
span.array->index, type, source, unpack,
ctx->_ImageTransferState);
/* These may get changed during writing/clipping */
span.x = x + skipPixels;
span.y = y + row;
span.end = spanWidth;
if (zoom)
_swrast_write_zoomed_index_span(ctx, imgX, imgY, &span);
else
_swrast_write_index_span(ctx, &span);
}
skipPixels += spanWidth;
}
}
/**
* Draw smooth/antialiased point. RGB or CI mode.
*/
static void
smooth_point(GLcontext *ctx, const SWvertex *vert)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLboolean ciMode = !ctx->Visual.rgbMode;
SWspan span;
GLfloat size, alphaAtten;
CULL_INVALID(vert);
/* z coord */
if (ctx->DrawBuffer->Visual.depthBits <= 16)
span.z = FloatToFixed(vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F);
else
span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F);
span.zStep = 0;
size = get_size(ctx, vert, GL_TRUE);
/* alpha attenuation / fade factor */
if (ctx->Multisample._Enabled) {
if (vert->pointSize >= ctx->Point.Threshold) {
alphaAtten = 1.0F;
}
else {
GLfloat dsize = vert->pointSize / ctx->Point.Threshold;
alphaAtten = dsize * dsize;
}
}
else {
alphaAtten = 1.0;
}
(void) alphaAtten; /* not used */
/* span init */
INIT_SPAN(span, GL_POINT);
span.interpMask = SPAN_Z | SPAN_RGBA;
span.arrayMask = SPAN_COVERAGE | SPAN_MASK;
span.facing = swrast->PointLineFacing;
span.red = ChanToFixed(vert->color[0]);
span.green = ChanToFixed(vert->color[1]);
span.blue = ChanToFixed(vert->color[2]);
span.alpha = ChanToFixed(vert->color[3]);
span.redStep = 0;
span.greenStep = 0;
span.blueStep = 0;
span.alphaStep = 0;
/* need these for fragment programs */
span.attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F;
span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F;
span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F;
ATTRIB_LOOP_BEGIN
COPY_4V(span.attrStart[attr], vert->attrib[attr]);
ASSIGN_4V(span.attrStepX[attr], 0, 0, 0, 0);
ASSIGN_4V(span.attrStepY[attr], 0, 0, 0, 0);
ATTRIB_LOOP_END
/* compute pos, bounds and render */
{
const GLfloat x = vert->attrib[FRAG_ATTRIB_WPOS][0];
const GLfloat y = vert->attrib[FRAG_ATTRIB_WPOS][1];
const GLfloat radius = 0.5F * size;
const GLfloat rmin = radius - 0.7071F; /* 0.7071 = sqrt(2)/2 */
const GLfloat rmax = radius + 0.7071F;
const GLfloat rmin2 = MAX2(0.0F, rmin * rmin);
const GLfloat rmax2 = rmax * rmax;
const GLfloat cscale = 1.0F / (rmax2 - rmin2);
const GLint xmin = (GLint) (x - radius);
const GLint xmax = (GLint) (x + radius);
const GLint ymin = (GLint) (y - radius);
const GLint ymax = (GLint) (y + radius);
GLint ix, iy;
for (iy = ymin; iy <= ymax; iy++) {
/* these might get changed by span clipping */
span.x = xmin;
span.y = iy;
span.end = xmax - xmin + 1;
/* compute coverage for each pixel in span */
for (ix = xmin; ix <= xmax; ix++) {
const GLfloat dx = ix - x + 0.5F;
const GLfloat dy = iy - y + 0.5F;
const GLfloat dist2 = dx * dx + dy * dy;
GLfloat coverage;
if (dist2 < rmax2) {
if (dist2 >= rmin2) {
/* compute partial coverage */
coverage = 1.0F - (dist2 - rmin2) * cscale;
if (ciMode) {
/* coverage in [0,15] */
coverage *= 15.0;
}
}
else {
/* full coverage */
coverage = 1.0F;
}
span.array->mask[ix - xmin] = 1;
}
else {
/* zero coverage - fragment outside the radius */
coverage = 0.0;
span.array->mask[ix - xmin] = 0;
}
span.array->coverage[ix - xmin] = coverage;
}
/* render span */
_swrast_write_rgba_span(ctx, &span);
}
}
}
/*
* TODO: Optimize!!!!
*/
static void
copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *readRb = fb->_DepthBuffer;
const GLfloat depthMax = fb->_DepthMaxF;
GLfloat *p, *tmpImage;
GLint sy, dy, stepy;
GLint i, j;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
struct sw_span span;
if (!readRb) {
/* no readbuffer - OK */
return;
}
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (srcy<desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
_swrast_span_default_color(ctx, &span);
if (swrast->_FogEnabled)
_swrast_span_default_fog(ctx, &span);
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat));
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = tmpImage;
for (j = 0; j < height; j++, ssy += stepy) {
_swrast_read_depth_span_float(ctx, readRb, width, srcx, ssy, p);
p += width;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warning */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
GLfloat depth[MAX_WIDTH];
/* get depth values */
if (overlapping) {
_mesa_memcpy(depth, p, width * sizeof(GLfloat));
p += width;
}
else {
_swrast_read_depth_span_float(ctx, readRb, width, srcx, sy, depth);
}
/* apply scale and bias */
for (i = 0; i < width; i++) {
GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
span.array->z[i] = (GLuint) (CLAMP(d, 0.0F, 1.0F) * depthMax);
}
/* write depth values */
span.x = destx;
span.y = dy;
span.end = width;
if (fb->Visual.rgbMode) {
if (zoom)
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span,
(const GLchan (*)[4]) span.array->rgba);
else
_swrast_write_rgba_span(ctx, &span);
}
else {
if (zoom)
_swrast_write_zoomed_index_span(ctx, destx, desty, &span);
else
_swrast_write_index_span(ctx, &span);
}
}
if (overlapping)
_mesa_free(tmpImage);
}
/**
* RGBA copypixels
*/
static void
copy_rgba_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
GLint width, GLint height, GLint destx, GLint desty)
{
GLfloat *tmpImage, *p;
GLint sy, dy, stepy, row;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
GLuint transferOps = ctx->_ImageTransferState;
SWspan span;
if (!ctx->ReadBuffer->_ColorReadBuffer) {
/* no readbuffer - OK */
return;
}
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
/* Determine if copy should be done bottom-to-top or top-to-bottom */
if (!overlapping && srcy < desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
INIT_SPAN(span, GL_BITMAP);
_swrast_span_default_attribs(ctx, &span);
span.arrayMask = SPAN_RGBA;
span.arrayAttribs = VARYING_BIT_COL0; /* we'll fill in COL0 attrib values */
if (overlapping) {
tmpImage = malloc(width * height * sizeof(GLfloat) * 4);
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
/* read the source image as RGBA/float */
p = tmpImage;
for (row = 0; row < height; row++) {
_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy + row, p );
p += width * 4;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warnings */
p = NULL;
}
ASSERT(width < SWRAST_MAX_WIDTH);
for (row = 0; row < height; row++, sy += stepy, dy += stepy) {
GLvoid *rgba = span.array->attribs[VARYING_SLOT_COL0];
/* Get row/span of source pixels */
if (overlapping) {
/* get from buffered image */
memcpy(rgba, p, width * sizeof(GLfloat) * 4);
p += width * 4;
}
else {
/* get from framebuffer */
_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy, rgba );
}
if (transferOps) {
_mesa_apply_rgba_transfer_ops(ctx, transferOps, width,
(GLfloat (*)[4]) rgba);
}
/* Write color span */
span.x = destx;
span.y = dy;
span.end = width;
span.array->ChanType = GL_FLOAT;
if (zoom) {
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
}
else {
_swrast_write_rgba_span(ctx, &span);
}
}
span.array->ChanType = CHAN_TYPE; /* restore */
if (overlapping)
free(tmpImage);
}
static void
accum_return(GLcontext *ctx, GLfloat value,
GLint xpos, GLint ypos, GLint width, GLint height )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct gl_renderbuffer *accumRb = fb->Attachment[BUFFER_ACCUM].Renderbuffer;
const GLboolean directAccess
= (accumRb->GetPointer(ctx, accumRb, 0, 0) != NULL);
const GLboolean masking = (!ctx->Color.ColorMask[RCOMP] ||
!ctx->Color.ColorMask[GCOMP] ||
!ctx->Color.ColorMask[BCOMP] ||
!ctx->Color.ColorMask[ACOMP]);
static GLchan multTable[32768];
static GLfloat prevMult = 0.0;
const GLfloat mult = swrast->_IntegerAccumScaler;
const GLint max = MIN2((GLint) (256 / mult), 32767);
/* May have to leave optimized accum buffer mode */
if (swrast->_IntegerAccumMode && value != 1.0)
rescale_accum(ctx);
if (swrast->_IntegerAccumMode && swrast->_IntegerAccumScaler > 0) {
/* build lookup table to avoid many floating point multiplies */
GLint j;
assert(swrast->_IntegerAccumScaler <= 1.0);
if (mult != prevMult) {
for (j = 0; j < max; j++)
multTable[j] = IROUND((GLfloat) j * mult);
prevMult = mult;
}
}
if (accumRb->DataType == GL_SHORT ||
accumRb->DataType == GL_UNSIGNED_SHORT) {
const GLfloat scale = value * CHAN_MAXF / ACCUM_SCALE16;
GLuint buffer;
GLint i;
/* XXX maybe transpose the 'i' and 'buffer' loops??? */
for (i = 0; i < height; i++) {
GLshort accumRow[4 * MAX_WIDTH];
GLshort *acc;
SWspan span;
/* init color span */
INIT_SPAN(span, GL_BITMAP);
span.end = width;
span.arrayMask = SPAN_RGBA;
span.x = xpos;
span.y = ypos + i;
if (directAccess) {
acc = (GLshort *) accumRb->GetPointer(ctx, accumRb, xpos, ypos +i);
}
else {
accumRb->GetRow(ctx, accumRb, width, xpos, ypos + i, accumRow);
acc = accumRow;
}
/* get the colors to return */
if (swrast->_IntegerAccumMode) {
GLint j;
for (j = 0; j < width; j++) {
ASSERT(acc[j * 4 + 0] < max);
ASSERT(acc[j * 4 + 1] < max);
ASSERT(acc[j * 4 + 2] < max);
ASSERT(acc[j * 4 + 3] < max);
span.array->rgba[j][RCOMP] = multTable[acc[j * 4 + 0]];
span.array->rgba[j][GCOMP] = multTable[acc[j * 4 + 1]];
span.array->rgba[j][BCOMP] = multTable[acc[j * 4 + 2]];
span.array->rgba[j][ACOMP] = multTable[acc[j * 4 + 3]];
}
}
else {
/* scaled integer (or float) accum buffer */
GLint j;
for (j = 0; j < width; j++) {
#if CHAN_BITS==32
GLchan r = acc[j * 4 + 0] * scale;
GLchan g = acc[j * 4 + 1] * scale;
GLchan b = acc[j * 4 + 2] * scale;
GLchan a = acc[j * 4 + 3] * scale;
#else
GLint r = IROUND( (GLfloat) (acc[j * 4 + 0]) * scale );
GLint g = IROUND( (GLfloat) (acc[j * 4 + 1]) * scale );
GLint b = IROUND( (GLfloat) (acc[j * 4 + 2]) * scale );
GLint a = IROUND( (GLfloat) (acc[j * 4 + 3]) * scale );
#endif
span.array->rgba[j][RCOMP] = CLAMP( r, 0, CHAN_MAX );
span.array->rgba[j][GCOMP] = CLAMP( g, 0, CHAN_MAX );
span.array->rgba[j][BCOMP] = CLAMP( b, 0, CHAN_MAX );
span.array->rgba[j][ACOMP] = CLAMP( a, 0, CHAN_MAX );
}
}
/* store colors */
for (buffer = 0; buffer < fb->_NumColorDrawBuffers; buffer++) {
struct gl_renderbuffer *rb = fb->_ColorDrawBuffers[buffer];
if (masking) {
_swrast_mask_rgba_span(ctx, rb, &span);
}
rb->PutRow(ctx, rb, width, xpos, ypos + i, span.array->rgba, NULL);
}
}
}
else {
/* other types someday */
}
}
/*
* Draw depth image.
*/
static void
draw_depth_pixels( struct gl_context *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels )
{
const GLboolean scaleOrBias
= ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
SWspan span;
INIT_SPAN(span, GL_BITMAP);
span.arrayMask = SPAN_Z;
_swrast_span_default_attribs(ctx, &span);
if (type == GL_UNSIGNED_SHORT
&& ctx->DrawBuffer->Visual.depthBits == 16
&& !scaleOrBias
&& !zoom
&& width <= SWRAST_MAX_WIDTH
&& !unpack->SwapBytes) {
/* Special case: directly write 16-bit depth values */
GLint row;
for (row = 0; row < height; row++) {
const GLushort *zSrc = (const GLushort *)
_mesa_image_address2d(unpack, pixels, width, height,
GL_DEPTH_COMPONENT, type, row, 0);
GLint i;
for (i = 0; i < width; i++)
span.array->z[i] = zSrc[i];
span.x = x;
span.y = y + row;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else if (type == GL_UNSIGNED_INT
&& !scaleOrBias
&& !zoom
&& width <= SWRAST_MAX_WIDTH
&& !unpack->SwapBytes) {
/* Special case: shift 32-bit values down to Visual.depthBits */
const GLint shift = 32 - ctx->DrawBuffer->Visual.depthBits;
GLint row;
for (row = 0; row < height; row++) {
const GLuint *zSrc = (const GLuint *)
_mesa_image_address2d(unpack, pixels, width, height,
GL_DEPTH_COMPONENT, type, row, 0);
if (shift == 0) {
memcpy(span.array->z, zSrc, width * sizeof(GLuint));
}
else {
GLint col;
for (col = 0; col < width; col++)
span.array->z[col] = zSrc[col] >> shift;
}
span.x = x;
span.y = y + row;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else {
/*
* XXX this is another way to implement Bitmap. Use horizontal runs of
* fragments, initializing the mask array to indicate which fragments to
* draw or skip.
*/
void
_swrast_Bitmap( struct gl_context *ctx, GLint px, GLint py,
GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLint row, col;
SWspan span;
ASSERT(ctx->RenderMode == GL_RENDER);
ASSERT(bitmap);
swrast_render_start(ctx);
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
INIT_SPAN(span, GL_BITMAP);
span.end = width;
span.arrayMask = SPAN_MASK;
_swrast_span_default_attribs(ctx, &span);
/*span.arrayMask |= SPAN_MASK;*/ /* we'll init span.mask[] */
span.x = px;
span.y = py;
/*span.end = width;*/
for (row=0; row<height; row++, span.y++) {
const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
if (unpack->LsbFirst) {
/* Lsb first */
GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
for (col=0; col<width; col++) {
span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
if (mask == 128U) {
src++;
mask = 1U;
}
else {
mask = mask << 1;
}
}
_swrast_write_rgba_span(ctx, &span);
/* get ready for next row */
if (mask != 1)
src++;
}
else {
/* Msb first */
GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
for (col=0; col<width; col++) {
span.array->mask[col] = (*src & mask) ? GL_TRUE : GL_FALSE;
if (mask == 1U) {
src++;
mask = 128U;
}
else {
mask = mask >> 1;
}
}
_swrast_write_rgba_span(ctx, &span);
/* get ready for next row */
if (mask != 128)
src++;
}
}
swrast_render_finish(ctx);
}
/*
* Try to do a fast and simple RGB(a) glDrawPixels.
* Return: GL_TRUE if success, GL_FALSE if slow path must be used instead
*/
static GLboolean
fast_draw_pixels(GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct sw_span span;
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
if (!ctx->Current.RasterPosValid) {
return GL_TRUE; /* no-op */
}
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (ctx->Fog.Enabled)
_swrast_span_default_fog(ctx, &span);
if (ctx->Texture._EnabledCoordUnits)
_swrast_span_default_texcoords(ctx, &span);
if ((SWRAST_CONTEXT(ctx)->_RasterMask & ~CLIP_BIT) == 0
&& ctx->Texture._EnabledCoordUnits == 0
&& unpack->Alignment == 1
&& !unpack->SwapBytes
&& !unpack->LsbFirst) {
GLint destX = x;
GLint destY = y;
GLint drawWidth = width; /* actual width drawn */
GLint drawHeight = height; /* actual height drawn */
GLint skipPixels = unpack->SkipPixels;
GLint skipRows = unpack->SkipRows;
GLint rowLength;
GLint zoomY0 = 0;
if (unpack->RowLength > 0)
rowLength = unpack->RowLength;
else
rowLength = width;
/* If we're not using pixel zoom then do all clipping calculations
* now. Otherwise, we'll let the _swrast_write_zoomed_*_span() functions
* handle the clipping.
*/
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* horizontal clipping */
if (destX < ctx->DrawBuffer->_Xmin) {
skipPixels += (ctx->DrawBuffer->_Xmin - destX);
drawWidth -= (ctx->DrawBuffer->_Xmin - destX);
destX = ctx->DrawBuffer->_Xmin;
}
if (destX + drawWidth > ctx->DrawBuffer->_Xmax)
drawWidth -= (destX + drawWidth - ctx->DrawBuffer->_Xmax);
if (drawWidth <= 0)
return GL_TRUE;
/* vertical clipping */
if (destY < ctx->DrawBuffer->_Ymin) {
skipRows += (ctx->DrawBuffer->_Ymin - destY);
drawHeight -= (ctx->DrawBuffer->_Ymin - destY);
destY = ctx->DrawBuffer->_Ymin;
}
if (destY + drawHeight > ctx->DrawBuffer->_Ymax)
drawHeight -= (destY + drawHeight - ctx->DrawBuffer->_Ymax);
if (drawHeight <= 0)
return GL_TRUE;
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down image */
/* horizontal clipping */
if (destX < ctx->DrawBuffer->_Xmin) {
skipPixels += (ctx->DrawBuffer->_Xmin - destX);
drawWidth -= (ctx->DrawBuffer->_Xmin - destX);
destX = ctx->DrawBuffer->_Xmin;
}
if (destX + drawWidth > ctx->DrawBuffer->_Xmax)
drawWidth -= (destX + drawWidth - ctx->DrawBuffer->_Xmax);
if (drawWidth <= 0)
return GL_TRUE;
/* vertical clipping */
if (destY > ctx->DrawBuffer->_Ymax) {
skipRows += (destY - ctx->DrawBuffer->_Ymax);
drawHeight -= (destY - ctx->DrawBuffer->_Ymax);
destY = ctx->DrawBuffer->_Ymax;
}
if (destY - drawHeight < ctx->DrawBuffer->_Ymin)
drawHeight -= (ctx->DrawBuffer->_Ymin - (destY - drawHeight));
if (drawHeight <= 0)
return GL_TRUE;
}
else {
if (drawWidth > MAX_WIDTH)
return GL_FALSE; /* fall back to general case path */
/* save Y value of first row */
zoomY0 = IROUND(ctx->Current.RasterPos[1]);
}
/*
* Ready to draw!
* The window region at (destX, destY) of size (drawWidth, drawHeight)
* will be written to.
* We'll take pixel data from buffer pointed to by "pixels" but we'll
* skip "skipRows" rows and skip "skipPixels" pixels/row.
*/
if (format == GL_RGBA && type == CHAN_TYPE
&& ctx->_ImageTransferState==0) {
if (ctx->Visual.rgbMode) {
GLchan *src = (GLchan *) pixels
+ (skipRows * rowLength + skipPixels) * 4;
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) src, NULL);
src += rowLength * 4;
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
for (row=0; row<drawHeight; row++) {
destY--;
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) src, NULL);
src += rowLength * 4;
}
}
else {
/* with zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgba_span(ctx, &span,
(CONST GLchan (*)[4]) src, zoomY0, 0);
src += rowLength * 4;
destY++;
}
}
}
return GL_TRUE;
}
else if (format == GL_RGB && type == CHAN_TYPE
&& ctx->_ImageTransferState == 0) {
if (ctx->Visual.rgbMode) {
GLchan *src = (GLchan *) pixels
+ (skipRows * rowLength + skipPixels) * 3;
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
GLint row;
for (row=0; row<drawHeight; row++) {
(*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[3]) src, NULL);
src += rowLength * 3;
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
for (row=0; row<drawHeight; row++) {
destY--;
(*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[3]) src, NULL);
src += rowLength * 3;
}
}
else {
/* with zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgb_span(ctx, &span,
(CONST GLchan (*)[3]) src, zoomY0, 0);
src += rowLength * 3;
destY++;
}
}
}
return GL_TRUE;
}
else if (format == GL_LUMINANCE && type == CHAN_TYPE
&& ctx->_ImageTransferState==0) {
if (ctx->Visual.rgbMode) {
GLchan *src = (GLchan *) pixels
+ (skipRows * rowLength + skipPixels);
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
for (i=0;i<drawWidth;i++) {
span.array->rgb[i][0] = src[i];
span.array->rgb[i][1] = src[i];
span.array->rgb[i][2] = src[i];
}
(*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[3]) span.array->rgb, NULL);
src += rowLength;
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
for (i=0;i<drawWidth;i++) {
span.array->rgb[i][0] = src[i];
span.array->rgb[i][1] = src[i];
span.array->rgb[i][2] = src[i];
}
destY--;
(*swrast->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[3]) span.array->rgb, NULL);
src += rowLength;
}
}
else {
/* with zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
for (i=0;i<drawWidth;i++) {
span.array->rgb[i][0] = src[i];
span.array->rgb[i][1] = src[i];
span.array->rgb[i][2] = src[i];
}
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgb_span(ctx, &span,
(CONST GLchan (*)[3]) span.array->rgb, zoomY0, 0);
src += rowLength;
destY++;
}
}
}
return GL_TRUE;
}
else if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE
&& ctx->_ImageTransferState == 0) {
if (ctx->Visual.rgbMode) {
GLchan *src = (GLchan *) pixels
+ (skipRows * rowLength + skipPixels)*2;
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
GLchan *ptr = src;
for (i=0;i<drawWidth;i++) {
span.array->rgba[i][0] = *ptr;
span.array->rgba[i][1] = *ptr;
span.array->rgba[i][2] = *ptr++;
span.array->rgba[i][3] = *ptr++;
}
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) span.array->rgba, NULL);
src += rowLength*2;
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
GLchan *ptr = src;
for (i=0;i<drawWidth;i++) {
span.array->rgba[i][0] = *ptr;
span.array->rgba[i][1] = *ptr;
span.array->rgba[i][2] = *ptr++;
span.array->rgba[i][3] = *ptr++;
}
destY--;
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) span.array->rgba, NULL);
src += rowLength*2;
}
}
else {
/* with zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLchan *ptr = src;
GLint i;
for (i=0;i<drawWidth;i++) {
span.array->rgba[i][0] = *ptr;
span.array->rgba[i][1] = *ptr;
span.array->rgba[i][2] = *ptr++;
span.array->rgba[i][3] = *ptr++;
}
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgba_span(ctx, &span,
(CONST GLchan (*)[4]) span.array->rgba, zoomY0, 0);
src += rowLength*2;
destY++;
}
}
}
return GL_TRUE;
}
else if (format==GL_COLOR_INDEX && type==GL_UNSIGNED_BYTE) {
GLubyte *src = (GLubyte *) pixels + skipRows * rowLength + skipPixels;
if (ctx->Visual.rgbMode) {
/* convert CI data to RGBA */
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(const GLchan (*)[4]) span.array->rgba, NULL);
src += rowLength;
destY++;
}
return GL_TRUE;
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
for (row=0; row<drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
destY--;
(*swrast->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(CONST GLchan (*)[4]) span.array->rgba, NULL);
src += rowLength;
}
return GL_TRUE;
}
else {
/* with zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba(ctx, drawWidth, src, span.array->rgba);
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgba_span(ctx, &span,
(CONST GLchan (*)[4]) span.array->rgba, zoomY0, 0);
src += rowLength;
destY++;
}
return GL_TRUE;
}
}
else if (ctx->_ImageTransferState==0) {
/* write CI data to CI frame buffer */
GLint row;
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
for (row=0; row<drawHeight; row++) {
(*swrast->Driver.WriteCI8Span)(ctx, drawWidth, destX, destY,
src, NULL);
src += rowLength;
destY++;
}
return GL_TRUE;
}
else {
/* with zooming */
return GL_FALSE;
}
}
}
else {
/* can't handle this pixel format and/or data type here */
return GL_FALSE;
}
}
/* can't do a simple draw, have to use slow path */
return GL_FALSE;
}
/**
* RGBA copypixels with convolution.
*/
static void
copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height, GLint destx, GLint desty)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLint row;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
const GLbitfield transferOps = ctx->_ImageTransferState;
const GLboolean sink = (ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink)
|| (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink);
GLfloat *dest, *tmpImage, *convImage;
SWspan span;
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (swrast->_FogEnabled)
_swrast_span_default_fog(ctx, &span);
_swrast_span_default_secondary_color(ctx, &span);
/* allocate space for GLfloat image */
tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!tmpImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!convImage) {
_mesa_free(tmpImage);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
/* read source image as float/RGBA */
dest = tmpImage;
for (row = 0; row < height; row++) {
_swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, srcy + row, GL_FLOAT, dest);
dest += 4 * width;
}
/* do the image transfer ops which preceed convolution */
for (row = 0; row < height; row++) {
GLfloat (*rgba)[4] = (GLfloat (*)[4]) (tmpImage + row * width * 4);
_mesa_apply_rgba_transfer_ops(ctx,
transferOps & IMAGE_PRE_CONVOLUTION_BITS,
width, rgba);
}
/* do convolution */
if (ctx->Pixel.Convolution2DEnabled) {
_mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
}
else {
ASSERT(ctx->Pixel.Separable2DEnabled);
_mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
}
_mesa_free(tmpImage);
/* do remaining post-convolution image transfer ops */
for (row = 0; row < height; row++) {
GLfloat (*rgba)[4] = (GLfloat (*)[4]) (convImage + row * width * 4);
_mesa_apply_rgba_transfer_ops(ctx,
transferOps & IMAGE_POST_CONVOLUTION_BITS,
width, rgba);
}
if (!sink) {
/* write the new image */
for (row = 0; row < height; row++) {
const GLfloat *src = convImage + row * width * 4;
GLvoid *rgba = (GLvoid *) span.array->attribs[FRAG_ATTRIB_COL0];
/* copy convolved colors into span array */
_mesa_memcpy(rgba, src, width * 4 * sizeof(GLfloat));
/* write span */
span.x = destx;
span.y = desty + row;
span.end = width;
span.array->ChanType = GL_FLOAT;
if (zoom) {
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
}
else {
_swrast_write_rgba_span(ctx, &span);
}
}
/* restore this */
span.array->ChanType = CHAN_TYPE;
}
_mesa_free(convImage);
}
/**
* RGBA copypixels
*/
static void
copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height, GLint destx, GLint desty)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLfloat *tmpImage, *p;
GLint sy, dy, stepy, row;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
GLuint transferOps = ctx->_ImageTransferState;
SWspan span;
if (!ctx->ReadBuffer->_ColorReadBuffer) {
/* no readbuffer - OK */
return;
}
if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
return;
}
else if (ctx->Pixel.Convolution1DEnabled) {
/* make sure we don't apply 1D convolution */
transferOps &= ~(IMAGE_CONVOLUTION_BIT |
IMAGE_POST_CONVOLUTION_SCALE_BIAS);
}
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
/* Determine if copy should be done bottom-to-top or top-to-bottom */
if (!overlapping && srcy < desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (swrast->_FogEnabled)
_swrast_span_default_fog(ctx, &span);
_swrast_span_default_secondary_color(ctx, &span);
if (overlapping) {
tmpImage = (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat) * 4);
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
/* read the source image as RGBA/float */
p = tmpImage;
for (row = 0; row < height; row++) {
_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy + row, GL_FLOAT, p );
p += width * 4;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warnings */
p = NULL;
}
ASSERT(width < MAX_WIDTH);
for (row = 0; row < height; row++, sy += stepy, dy += stepy) {
GLvoid *rgba = span.array->attribs[FRAG_ATTRIB_COL0];
/* Get row/span of source pixels */
if (overlapping) {
/* get from buffered image */
_mesa_memcpy(rgba, p, width * sizeof(GLfloat) * 4);
p += width * 4;
}
else {
/* get from framebuffer */
_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy, GL_FLOAT, rgba );
}
if (transferOps) {
_mesa_apply_rgba_transfer_ops(ctx, transferOps, width,
(GLfloat (*)[4]) rgba);
}
/* Write color span */
span.x = destx;
span.y = dy;
span.end = width;
span.array->ChanType = GL_FLOAT;
if (zoom) {
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
}
else {
_swrast_write_rgba_span(ctx, &span);
}
}
span.array->ChanType = CHAN_TYPE; /* restore */
if (overlapping)
_mesa_free(tmpImage);
}
/*
* TODO: Optimize!!!!
*/
static void
copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *readRb = fb->_DepthBuffer;
GLfloat *p, *tmpImage;
GLint sy, dy, stepy;
GLint j;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
SWspan span;
if (!readRb) {
/* no readbuffer - OK */
return;
}
INIT_SPAN(span, GL_BITMAP);
_swrast_span_default_attribs(ctx, &span);
span.arrayMask = SPAN_Z;
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (!overlapping && srcy < desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLfloat *) malloc(width * height * sizeof(GLfloat));
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = tmpImage;
for (j = 0; j < height; j++, ssy += stepy) {
_swrast_read_depth_span_float(ctx, readRb, width, srcx, ssy, p);
p += width;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warning */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
GLfloat depth[MAX_WIDTH];
/* get depth values */
if (overlapping) {
memcpy(depth, p, width * sizeof(GLfloat));
p += width;
}
else {
_swrast_read_depth_span_float(ctx, readRb, width, srcx, sy, depth);
}
/* apply scale and bias */
scale_and_bias_z(ctx, width, depth, span.array->z);
/* write depth values */
span.x = destx;
span.y = dy;
span.end = width;
if (zoom)
_swrast_write_zoomed_depth_span(ctx, destx, desty, &span);
else
_swrast_write_rgba_span(ctx, &span);
}
if (overlapping)
free(tmpImage);
}
/*
* Helper function called from _swrast_write_zoomed_rgba/rgb/index_span().
*/
static void
zoom_span( GLcontext *ctx, const struct sw_span *span,
const GLvoid *src, GLint y0, GLenum format, GLint skipPixels )
{
GLint r0, r1, row;
GLint c0, c1, skipCol;
GLint i, j;
const GLuint maxWidth = MIN2( ctx->DrawBuffer->Width, MAX_WIDTH );
struct sw_span zoomed;
struct span_arrays zoomed_arrays; /* this is big! */
/* no pixel arrays! must be horizontal spans. */
ASSERT((span->arrayMask & SPAN_XY) == 0);
ASSERT(span->primitive == GL_BITMAP);
INIT_SPAN(zoomed, GL_BITMAP, 0, 0, 0);
zoomed.array = &zoomed_arrays;
/* copy fog interp info */
zoomed.fog = span->fog;
zoomed.fogStep = span->fogStep;
/* XXX copy texcoord info? */
if (format == GL_RGBA || format == GL_RGB) {
/* copy Z info */
zoomed.z = span->z;
zoomed.zStep = span->zStep;
/* we'll generate an array of colorss */
zoomed.interpMask = span->interpMask & ~SPAN_RGBA;
zoomed.arrayMask |= SPAN_RGBA;
}
else if (format == GL_COLOR_INDEX) {
/* copy Z info */
zoomed.z = span->z;
zoomed.zStep = span->zStep;
/* we'll generate an array of color indexes */
zoomed.interpMask = span->interpMask & ~SPAN_INDEX;
zoomed.arrayMask |= SPAN_INDEX;
}
else {
assert(format == GL_DEPTH_COMPONENT);
/* Copy color info */
zoomed.red = span->red;
zoomed.green = span->green;
zoomed.blue = span->blue;
zoomed.alpha = span->alpha;
zoomed.redStep = span->redStep;
zoomed.greenStep = span->greenStep;
zoomed.blueStep = span->blueStep;
zoomed.alphaStep = span->alphaStep;
/* we'll generate an array of depth values */
zoomed.interpMask = span->interpMask & ~SPAN_Z;
zoomed.arrayMask |= SPAN_Z;
}
/*
* Compute which columns to draw: [c0, c1)
*/
c0 = (GLint) (span->x + skipPixels * ctx->Pixel.ZoomX);
c1 = (GLint) (span->x + (skipPixels + span->end) * ctx->Pixel.ZoomX);
if (c0 == c1) {
return;
}
else if (c1 < c0) {
/* swap */
GLint ctmp = c1;
c1 = c0;
c0 = ctmp;
}
if (c0 < 0) {
zoomed.x = 0;
zoomed.start = 0;
zoomed.end = c1;
skipCol = -c0;
}
else {
zoomed.x = c0;
zoomed.start = 0;
zoomed.end = c1 - c0;
skipCol = 0;
}
if (zoomed.end > maxWidth)
zoomed.end = maxWidth;
/*
* Compute which rows to draw: [r0, r1)
*/
row = span->y - y0;
r0 = y0 + (GLint) (row * ctx->Pixel.ZoomY);
r1 = y0 + (GLint) ((row+1) * ctx->Pixel.ZoomY);
if (r0 == r1) {
return;
}
else if (r1 < r0) {
/* swap */
GLint rtmp = r1;
r1 = r0;
r0 = rtmp;
}
ASSERT(r0 < r1);
ASSERT(c0 < c1);
/*
* Trivial clip rejection testing.
*/
if (r1 < 0) /* below window */
return;
if (r0 >= (GLint) ctx->DrawBuffer->Height) /* above window */
return;
if (c1 < 0) /* left of window */
return;
if (c0 >= (GLint) ctx->DrawBuffer->Width) /* right of window */
return;
/* zoom the span horizontally */
if (format == GL_RGBA) {
const GLchan (*rgba)[4] = (const GLchan (*)[4]) src;
if (ctx->Pixel.ZoomX == -1.0F) {
/* common case */
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = span->end - (j + skipCol) - 1;
COPY_CHAN4(zoomed.array->rgba[j], rgba[i]);
}
}
else {
/* general solution */
const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = (GLint) ((j + skipCol) * xscale);
if (ctx->Pixel.ZoomX < 0.0) {
ASSERT(i <= 0);
i = span->end + i - 1;
}
ASSERT(i >= 0);
ASSERT(i < (GLint) span->end);
COPY_CHAN4(zoomed.array->rgba[j], rgba[i]);
}
}
}
else if (format == GL_RGB) {
const GLchan (*rgb)[3] = (const GLchan (*)[3]) src;
if (ctx->Pixel.ZoomX == -1.0F) {
/* common case */
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = span->end - (j + skipCol) - 1;
zoomed.array->rgba[j][0] = rgb[i][0];
zoomed.array->rgba[j][1] = rgb[i][1];
zoomed.array->rgba[j][2] = rgb[i][2];
zoomed.array->rgba[j][3] = CHAN_MAX;
}
}
else {
/* general solution */
const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = (GLint) ((j + skipCol) * xscale);
if (ctx->Pixel.ZoomX < 0.0) {
ASSERT(i <= 0);
i = span->end + i - 1;
}
ASSERT(i >= 0);
ASSERT(i < (GLint) span->end);
zoomed.array->rgba[j][0] = rgb[i][0];
zoomed.array->rgba[j][1] = rgb[i][1];
zoomed.array->rgba[j][2] = rgb[i][2];
zoomed.array->rgba[j][3] = CHAN_MAX;
}
}
}
else if (format == GL_COLOR_INDEX) {
const GLuint *indexes = (const GLuint *) src;
if (ctx->Pixel.ZoomX == -1.0F) {
/* common case */
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = span->end - (j + skipCol) - 1;
zoomed.array->index[j] = indexes[i];
}
}
else {
/* general solution */
const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = (GLint) ((j + skipCol) * xscale);
if (ctx->Pixel.ZoomX < 0.0) {
ASSERT(i <= 0);
i = span->end + i - 1;
}
ASSERT(i >= 0);
ASSERT(i < (GLint) span->end);
zoomed.array->index[j] = indexes[i];
}
}
}
else {
const GLdepth *zValues = (const GLuint *) src;
assert(format == GL_DEPTH_COMPONENT);
if (ctx->Pixel.ZoomX == -1.0F) {
/* common case */
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = span->end - (j + skipCol) - 1;
zoomed.array->z[j] = zValues[i];
}
}
else {
/* general solution */
const GLfloat xscale = 1.0F / ctx->Pixel.ZoomX;
for (j = (GLint) zoomed.start; j < (GLint) zoomed.end; j++) {
i = (GLint) ((j + skipCol) * xscale);
if (ctx->Pixel.ZoomX < 0.0) {
ASSERT(i <= 0);
i = span->end + i - 1;
}
ASSERT(i >= 0);
ASSERT(i < (GLint) span->end);
zoomed.array->z[j] = zValues[i];
}
}
/* Now, fall into either the RGB or COLOR_INDEX path below */
if (ctx->Visual.rgbMode)
format = GL_RGBA;
else
format = GL_COLOR_INDEX;
}
/* write the span in rows [r0, r1) */
if (format == GL_RGBA || format == GL_RGB) {
/* Writing the span may modify the colors, so make a backup now if we're
* going to call _swrast_write_zoomed_span() more than once.
* Also, clipping may change the span end value, so store it as well.
*/
GLchan rgbaSave[MAX_WIDTH][4];
const GLint end = zoomed.end; /* save */
if (r1 - r0 > 1) {
MEMCPY(rgbaSave, zoomed.array->rgba, zoomed.end * 4 * sizeof(GLchan));
}
for (zoomed.y = r0; zoomed.y < r1; zoomed.y++) {
_swrast_write_rgba_span(ctx, &zoomed);
zoomed.end = end; /* restore */
if (r1 - r0 > 1) {
/* restore the colors */
MEMCPY(zoomed.array->rgba, rgbaSave, zoomed.end*4 * sizeof(GLchan));
}
}
}
else if (format == GL_COLOR_INDEX) {
GLuint indexSave[MAX_WIDTH];
const GLint end = zoomed.end; /* save */
if (r1 - r0 > 1) {
MEMCPY(indexSave, zoomed.array->index, zoomed.end * sizeof(GLuint));
}
for (zoomed.y = r0; zoomed.y < r1; zoomed.y++) {
_swrast_write_index_span(ctx, &zoomed);
zoomed.end = end; /* restore */
if (r1 - r0 > 1) {
/* restore the colors */
MEMCPY(zoomed.array->index, indexSave, zoomed.end * sizeof(GLuint));
}
}
}
}
/**
* Draw large (size >= 1) non-AA point. RGB or CI mode.
*/
static void
large_point(GLcontext *ctx, const SWvertex *vert)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLboolean ciMode = !ctx->Visual.rgbMode;
SWspan span;
GLfloat size;
CULL_INVALID(vert);
/* z coord */
if (ctx->DrawBuffer->Visual.depthBits <= 16)
span.z = FloatToFixed(vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F);
else
span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F);
span.zStep = 0;
size = get_size(ctx, vert, GL_FALSE);
/* span init */
INIT_SPAN(span, GL_POINT);
span.arrayMask = SPAN_XY;
span.facing = swrast->PointLineFacing;
if (ciMode) {
span.interpMask = SPAN_Z | SPAN_INDEX;
span.index = FloatToFixed(vert->attrib[FRAG_ATTRIB_CI][0]);
span.indexStep = 0;
}
else {
span.interpMask = SPAN_Z | SPAN_RGBA;
span.red = ChanToFixed(vert->color[0]);
span.green = ChanToFixed(vert->color[1]);
span.blue = ChanToFixed(vert->color[2]);
span.alpha = ChanToFixed(vert->color[3]);
span.redStep = 0;
span.greenStep = 0;
span.blueStep = 0;
span.alphaStep = 0;
}
/* need these for fragment programs */
span.attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F;
span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F;
span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F;
ATTRIB_LOOP_BEGIN
COPY_4V(span.attrStart[attr], vert->attrib[attr]);
ASSIGN_4V(span.attrStepX[attr], 0, 0, 0, 0);
ASSIGN_4V(span.attrStepY[attr], 0, 0, 0, 0);
ATTRIB_LOOP_END
/* compute pos, bounds and render */
{
const GLfloat x = vert->attrib[FRAG_ATTRIB_WPOS][0];
const GLfloat y = vert->attrib[FRAG_ATTRIB_WPOS][1];
GLint iSize = (GLint) (size + 0.5F);
GLint xmin, xmax, ymin, ymax, ix, iy;
GLint iRadius;
iSize = MAX2(1, iSize);
iRadius = iSize / 2;
if (iSize & 1) {
/* odd size */
xmin = (GLint) (x - iRadius);
xmax = (GLint) (x + iRadius);
ymin = (GLint) (y - iRadius);
ymax = (GLint) (y + iRadius);
}
else {
/* even size */
/* 0.501 factor allows conformance to pass */
xmin = (GLint) (x + 0.501) - iRadius;
xmax = xmin + iSize - 1;
ymin = (GLint) (y + 0.501) - iRadius;
ymax = ymin + iSize - 1;
}
/* generate fragments */
span.end = 0;
for (iy = ymin; iy <= ymax; iy++) {
for (ix = xmin; ix <= xmax; ix++) {
span.array->x[span.end] = ix;
span.array->y[span.end] = iy;
span.end++;
}
}
assert(span.end <= MAX_WIDTH);
_swrast_write_rgba_span(ctx, &span);
}
}
/**
* Draw a point sprite
*/
static void
sprite_point(GLcontext *ctx, const SWvertex *vert)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
SWspan span;
GLfloat size;
GLuint tCoords[MAX_TEXTURE_COORD_UNITS + 1];
GLuint numTcoords = 0;
GLfloat t0, dtdy;
CULL_INVALID(vert);
/* z coord */
if (ctx->DrawBuffer->Visual.depthBits <= 16)
span.z = FloatToFixed(vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F);
else
span.z = (GLuint) (vert->attrib[FRAG_ATTRIB_WPOS][2] + 0.5F);
span.zStep = 0;
size = get_size(ctx, vert, GL_FALSE);
/* span init */
INIT_SPAN(span, GL_POINT);
span.interpMask = SPAN_Z | SPAN_RGBA;
span.facing = swrast->PointLineFacing;
span.red = ChanToFixed(vert->color[0]);
span.green = ChanToFixed(vert->color[1]);
span.blue = ChanToFixed(vert->color[2]);
span.alpha = ChanToFixed(vert->color[3]);
span.redStep = 0;
span.greenStep = 0;
span.blueStep = 0;
span.alphaStep = 0;
/* need these for fragment programs */
span.attrStart[FRAG_ATTRIB_WPOS][3] = 1.0F;
span.attrStepX[FRAG_ATTRIB_WPOS][3] = 0.0F;
span.attrStepY[FRAG_ATTRIB_WPOS][3] = 0.0F;
{
GLfloat s, r, dsdx;
/* texcoord / pointcoord interpolants */
s = 0.0;
dsdx = 1.0 / size;
if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT) {
dtdy = 1.0 / size;
t0 = 0.5 * dtdy;
}
else {
/* GL_UPPER_LEFT */
dtdy = -1.0 / size;
t0 = 1.0 + 0.5 * dtdy;
}
ATTRIB_LOOP_BEGIN
if (attr >= FRAG_ATTRIB_TEX0 && attr < FRAG_ATTRIB_VAR0) {
const GLuint u = attr - FRAG_ATTRIB_TEX0;
/* a texcoord */
if (ctx->Point.CoordReplace[u]) {
tCoords[numTcoords++] = attr;
if (ctx->Point.SpriteRMode == GL_ZERO)
r = 0.0F;
else if (ctx->Point.SpriteRMode == GL_S)
r = vert->attrib[attr][0];
else /* GL_R */
r = vert->attrib[attr][2];
span.attrStart[attr][0] = s;
span.attrStart[attr][1] = 0.0; /* overwritten below */
span.attrStart[attr][2] = r;
span.attrStart[attr][3] = 1.0;
span.attrStepX[attr][0] = dsdx;
span.attrStepX[attr][1] = 0.0;
span.attrStepX[attr][2] = 0.0;
span.attrStepX[attr][3] = 0.0;
span.attrStepY[attr][0] = 0.0;
span.attrStepY[attr][1] = dtdy;
span.attrStepY[attr][2] = 0.0;
span.attrStepY[attr][3] = 0.0;
continue;
}
}
else if (attr == FRAG_ATTRIB_FOGC) {
/* GLSL gl_PointCoord is stored in fog.zw */
span.attrStart[FRAG_ATTRIB_FOGC][2] = 0.0;
span.attrStart[FRAG_ATTRIB_FOGC][3] = 0.0; /* t0 set below */
span.attrStepX[FRAG_ATTRIB_FOGC][2] = dsdx;
span.attrStepX[FRAG_ATTRIB_FOGC][3] = 0.0;
span.attrStepY[FRAG_ATTRIB_FOGC][2] = 0.0;
span.attrStepY[FRAG_ATTRIB_FOGC][3] = dtdy;
tCoords[numTcoords++] = FRAG_ATTRIB_FOGC;
continue;
}
/* use vertex's texcoord/attrib */
COPY_4V(span.attrStart[attr], vert->attrib[attr]);
ASSIGN_4V(span.attrStepX[attr], 0, 0, 0, 0);
ASSIGN_4V(span.attrStepY[attr], 0, 0, 0, 0);
ATTRIB_LOOP_END;
}
/* compute pos, bounds and render */
{
const GLfloat x = vert->attrib[FRAG_ATTRIB_WPOS][0];
const GLfloat y = vert->attrib[FRAG_ATTRIB_WPOS][1];
GLint iSize = (GLint) (size + 0.5F);
GLint xmin, xmax, ymin, ymax, iy;
GLint iRadius;
GLfloat tcoord = t0;
iSize = MAX2(1, iSize);
iRadius = iSize / 2;
if (iSize & 1) {
/* odd size */
xmin = (GLint) (x - iRadius);
xmax = (GLint) (x + iRadius);
ymin = (GLint) (y - iRadius);
ymax = (GLint) (y + iRadius);
}
else {
/* even size */
/* 0.501 factor allows conformance to pass */
xmin = (GLint) (x + 0.501) - iRadius;
xmax = xmin + iSize - 1;
ymin = (GLint) (y + 0.501) - iRadius;
ymax = ymin + iSize - 1;
}
/* render spans */
for (iy = ymin; iy <= ymax; iy++) {
GLuint i;
/* setup texcoord T for this row */
for (i = 0; i < numTcoords; i++) {
if (tCoords[i] == FRAG_ATTRIB_FOGC)
span.attrStart[FRAG_ATTRIB_FOGC][3] = tcoord;
else
span.attrStart[tCoords[i]][1] = tcoord;
}
/* these might get changed by span clipping */
span.x = xmin;
span.y = iy;
span.end = xmax - xmin + 1;
_swrast_write_rgba_span(ctx, &span);
tcoord += dtdy;
}
}
}
/*
* Draw depth image.
*/
static void
draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels )
{
const GLboolean bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
const GLint desty = y;
struct sw_span span;
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
if (type != GL_BYTE
&& type != GL_UNSIGNED_BYTE
&& type != GL_SHORT
&& type != GL_UNSIGNED_SHORT
&& type != GL_INT
&& type != GL_UNSIGNED_INT
&& type != GL_FLOAT) {
_mesa_error(ctx, GL_INVALID_ENUM, "glDrawPixels(type)");
return;
}
_swrast_span_default_color(ctx, &span);
if (ctx->Fog.Enabled)
_swrast_span_default_fog(ctx, &span);
if (ctx->Texture._EnabledCoordUnits)
_swrast_span_default_texcoords(ctx, &span);
if (type == GL_UNSIGNED_SHORT
&& ctx->Visual.depthBits == 16
&& !bias_or_scale
&& !zoom
&& ctx->Visual.rgbMode
&& width <= MAX_WIDTH) {
/* Special case: directly write 16-bit depth values */
GLint row, spanY = y;
for (row = 0; row < height; row++, spanY++) {
const GLushort *zSrc = (const GLushort *)
_mesa_image_address2d(unpack, pixels, width, height,
GL_DEPTH_COMPONENT, type, row, 0);
GLint i;
for (i = 0; i < width; i++)
span.array->z[i] = zSrc[i];
span.x = x;
span.y = spanY;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else if (type == GL_UNSIGNED_INT
&& sizeof(GLdepth) == 4
&& !bias_or_scale
&& !zoom
&& ctx->Visual.rgbMode
&& width <= MAX_WIDTH) {
/* Special case: shift 32-bit values down to ctx->Visual.depthBits */
const GLint shift = 32 - ctx->Visual.depthBits;
GLint row, spanY = y;
for (row = 0; row < height; row++, spanY++) {
const GLuint *zSrc = (const GLuint *)
_mesa_image_address2d(unpack, pixels, width, height,
GL_DEPTH_COMPONENT, type, row, 0);
if (shift == 0) {
MEMCPY(span.array->z, zSrc, width * sizeof(GLdepth));
}
else {
GLint col;
for (col = 0; col < width; col++)
span.array->z[col] = zSrc[col] >> shift;
}
span.x = x;
span.y = spanY;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else {
/**
* Render a bitmap.
* Called via ctx->Driver.Bitmap()
* All parameter error checking will have been done before this is called.
*/
void
_swrast_Bitmap( struct gl_context *ctx, GLint px, GLint py,
GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap )
{
GLint row, col;
GLuint count = 0;
SWspan span;
ASSERT(ctx->RenderMode == GL_RENDER);
if (!_mesa_check_conditional_render(ctx))
return; /* don't draw */
bitmap = (const GLubyte *) _mesa_map_pbo_source(ctx, unpack, bitmap);
if (!bitmap)
return;
swrast_render_start(ctx);
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
INIT_SPAN(span, GL_BITMAP);
span.end = width;
span.arrayMask = SPAN_XY;
_swrast_span_default_attribs(ctx, &span);
for (row = 0; row < height; row++) {
const GLubyte *src = (const GLubyte *) _mesa_image_address2d(unpack,
bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, row, 0);
if (unpack->LsbFirst) {
/* Lsb first */
GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
for (col = 0; col < width; col++) {
if (*src & mask) {
span.array->x[count] = px + col;
span.array->y[count] = py + row;
count++;
}
if (mask == 128U) {
src++;
mask = 1U;
}
else {
mask = mask << 1;
}
}
/* get ready for next row */
if (mask != 1)
src++;
}
else {
/* Msb first */
GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
for (col = 0; col < width; col++) {
if (*src & mask) {
span.array->x[count] = px + col;
span.array->y[count] = py + row;
count++;
}
if (mask == 1U) {
src++;
mask = 128U;
}
else {
mask = mask >> 1;
}
}
/* get ready for next row */
if (mask != 128)
src++;
}
if (count + width >= SWRAST_MAX_WIDTH || row + 1 == height) {
/* flush the span */
span.end = count;
_swrast_write_rgba_span(ctx, &span);
span.end = 0;
count = 0;
}
}
swrast_render_finish(ctx);
_mesa_unmap_pbo_source(ctx, unpack);
}
/**
* Try to do a fast and simple RGB(a) glDrawPixels.
* Return: GL_TRUE if success, GL_FALSE if slow path must be used instead
*/
static GLboolean
fast_draw_rgba_pixels(struct gl_context *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *userUnpack,
const GLvoid *pixels)
{
const GLint imgX = x, imgY = y;
struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
GLenum rbType;
SWcontext *swrast = SWRAST_CONTEXT(ctx);
SWspan span;
GLboolean simpleZoom;
GLint yStep; /* +1 or -1 */
struct gl_pixelstore_attrib unpack;
GLint destX, destY, drawWidth, drawHeight; /* post clipping */
if (!rb)
return GL_TRUE; /* no-op */
rbType = rb->DataType;
if ((swrast->_RasterMask & ~CLIP_BIT) ||
ctx->Texture._EnabledCoordUnits ||
userUnpack->SwapBytes ||
ctx->_ImageTransferState) {
/* can't handle any of those conditions */
return GL_FALSE;
}
INIT_SPAN(span, GL_BITMAP);
span.arrayMask = SPAN_RGBA;
span.arrayAttribs = FRAG_BIT_COL0;
_swrast_span_default_attribs(ctx, &span);
/* copy input params since clipping may change them */
unpack = *userUnpack;
destX = x;
destY = y;
drawWidth = width;
drawHeight = height;
/* check for simple zooming and clipping */
if (ctx->Pixel.ZoomX == 1.0F &&
(ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F)) {
if (!_mesa_clip_drawpixels(ctx, &destX, &destY,
&drawWidth, &drawHeight, &unpack)) {
/* image was completely clipped: no-op, all done */
return GL_TRUE;
}
simpleZoom = GL_TRUE;
yStep = (GLint) ctx->Pixel.ZoomY;
ASSERT(yStep == 1 || yStep == -1);
}
else {
/* non-simple zooming */
simpleZoom = GL_FALSE;
yStep = 1;
if (unpack.RowLength == 0)
unpack.RowLength = width;
}
/*
* Ready to draw!
*/
if (format == GL_RGBA && type == rbType) {
const GLubyte *src
= (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
height, format, type, 0, 0);
const GLint srcStride = _mesa_image_row_stride(&unpack, width,
format, type);
if (simpleZoom) {
GLint row;
for (row = 0; row < drawHeight; row++) {
rb->PutRow(ctx, rb, drawWidth, destX, destY, src, NULL);
src += srcStride;
destY += yStep;
}
}
else {
/* with zooming */
GLint row;
for (row = 0; row < drawHeight; row++) {
span.x = destX;
span.y = destY + row;
span.end = drawWidth;
span.array->ChanType = rbType;
_swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span, src);
src += srcStride;
}
span.array->ChanType = CHAN_TYPE;
}
return GL_TRUE;
}
if (format == GL_RGB && type == rbType) {
const GLubyte *src
= (const GLubyte *) _mesa_image_address2d(&unpack, pixels, width,
height, format, type, 0, 0);
const GLint srcStride = _mesa_image_row_stride(&unpack, width,
format, type);
if (simpleZoom) {
GLint row;
for (row = 0; row < drawHeight; row++) {
rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, src, NULL);
src += srcStride;
destY += yStep;
}
}
else {
/* with zooming */
GLint row;
for (row = 0; row < drawHeight; row++) {
span.x = destX;
span.y = destY;
span.end = drawWidth;
span.array->ChanType = rbType;
_swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, src);
src += srcStride;
destY++;
}
span.array->ChanType = CHAN_TYPE;
}
return GL_TRUE;
}
/* Remaining cases haven't been tested with alignment != 1 */
if (userUnpack->Alignment != 1)
return GL_FALSE;
if (format == GL_LUMINANCE && type == CHAN_TYPE && rbType == CHAN_TYPE) {
const GLchan *src = (const GLchan *) pixels
+ (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels);
if (simpleZoom) {
/* no zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row = 0; row < drawHeight; row++) {
GLchan rgb[MAX_WIDTH][3];
GLint i;
for (i = 0;i<drawWidth;i++) {
rgb[i][0] = src[i];
rgb[i][1] = src[i];
rgb[i][2] = src[i];
}
rb->PutRowRGB(ctx, rb, drawWidth, destX, destY, rgb, NULL);
src += unpack.RowLength;
destY += yStep;
}
}
else {
/* with zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row = 0; row < drawHeight; row++) {
GLchan rgb[MAX_WIDTH][3];
GLint i;
for (i = 0;i<drawWidth;i++) {
rgb[i][0] = src[i];
rgb[i][1] = src[i];
rgb[i][2] = src[i];
}
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgb_span(ctx, imgX, imgY, &span, rgb);
src += unpack.RowLength;
destY++;
}
}
return GL_TRUE;
}
if (format == GL_LUMINANCE_ALPHA && type == CHAN_TYPE && rbType == CHAN_TYPE) {
const GLchan *src = (const GLchan *) pixels
+ (unpack.SkipRows * unpack.RowLength + unpack.SkipPixels)*2;
if (simpleZoom) {
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row = 0; row < drawHeight; row++) {
GLint i;
const GLchan *ptr = src;
for (i = 0;i<drawWidth;i++) {
span.array->rgba[i][0] = *ptr;
span.array->rgba[i][1] = *ptr;
span.array->rgba[i][2] = *ptr++;
span.array->rgba[i][3] = *ptr++;
}
rb->PutRow(ctx, rb, drawWidth, destX, destY,
span.array->rgba, NULL);
src += unpack.RowLength*2;
destY += yStep;
}
}
else {
/* with zooming */
GLint row;
ASSERT(drawWidth <= MAX_WIDTH);
for (row = 0; row < drawHeight; row++) {
const GLchan *ptr = src;
GLint i;
for (i = 0;i<drawWidth;i++) {
span.array->rgba[i][0] = *ptr;
span.array->rgba[i][1] = *ptr;
span.array->rgba[i][2] = *ptr++;
span.array->rgba[i][3] = *ptr++;
}
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
span.array->rgba);
src += unpack.RowLength*2;
destY++;
}
}
return GL_TRUE;
}
if (format == GL_COLOR_INDEX && type == GL_UNSIGNED_BYTE) {
const GLubyte *src = (const GLubyte *) pixels
+ unpack.SkipRows * unpack.RowLength + unpack.SkipPixels;
if (rbType == GL_UNSIGNED_BYTE) {
/* convert ubyte/CI data to ubyte/RGBA */
if (simpleZoom) {
GLint row;
for (row = 0; row < drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
span.array->rgba8);
rb->PutRow(ctx, rb, drawWidth, destX, destY,
span.array->rgba8, NULL);
src += unpack.RowLength;
destY += yStep;
}
}
else {
/* ubyte/CI to ubyte/RGBA with zooming */
GLint row;
for (row = 0; row < drawHeight; row++) {
ASSERT(drawWidth <= MAX_WIDTH);
_mesa_map_ci8_to_rgba8(ctx, drawWidth, src,
span.array->rgba8);
span.x = destX;
span.y = destY;
span.end = drawWidth;
_swrast_write_zoomed_rgba_span(ctx, imgX, imgY, &span,
span.array->rgba8);
src += unpack.RowLength;
destY++;
}
}
return GL_TRUE;
}
}
/* can't handle this pixel format and/or data type */
return GL_FALSE;
}
/*
* Render a bitmap.
*/
void
_swrast_Bitmap( GLcontext *ctx, GLint px, GLint py,
GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLint row, col;
GLuint count = 0;
struct sw_span span;
ASSERT(ctx->RenderMode == GL_RENDER);
ASSERT(bitmap);
RENDER_START(swrast,ctx);
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
INIT_SPAN(span, GL_BITMAP, width, 0, SPAN_XY);
if (ctx->Visual.rgbMode) {
span.interpMask |= SPAN_RGBA;
span.red = FloatToFixed(ctx->Current.RasterColor[0] * CHAN_MAXF);
span.green = FloatToFixed(ctx->Current.RasterColor[1] * CHAN_MAXF);
span.blue = FloatToFixed(ctx->Current.RasterColor[2] * CHAN_MAXF);
span.alpha = FloatToFixed(ctx->Current.RasterColor[3] * CHAN_MAXF);
span.redStep = span.greenStep = span.blueStep = span.alphaStep = 0;
}
else {
span.interpMask |= SPAN_INDEX;
span.index = ChanToFixed(ctx->Current.RasterIndex);
span.indexStep = 0;
}
if (ctx->Depth.Test)
_mesa_span_default_z(ctx, &span);
if (ctx->Fog.Enabled)
_mesa_span_default_fog(ctx, &span);
if (ctx->Texture._EnabledUnits)
_mesa_span_default_texcoords(ctx, &span);
for (row = 0; row < height; row++, span.y++) {
const GLubyte *src = (const GLubyte *) _mesa_image_address( unpack,
bitmap, width, height, GL_COLOR_INDEX, GL_BITMAP, 0, row, 0 );
if (unpack->LsbFirst) {
/* Lsb first */
GLubyte mask = 1U << (unpack->SkipPixels & 0x7);
for (col = 0; col < width; col++) {
if (*src & mask) {
span.array->x[count] = px + col;
span.array->y[count] = py + row;
count++;
}
if (mask == 128U) {
src++;
mask = 1U;
}
else {
mask = mask << 1;
}
}
/* get ready for next row */
if (mask != 1)
src++;
}
else {
/* Msb first */
GLubyte mask = 128U >> (unpack->SkipPixels & 0x7);
for (col = 0; col < width; col++) {
if (*src & mask) {
span.array->x[count] = px + col;
span.array->y[count] = py + row;
count++;
}
if (mask == 1U) {
src++;
mask = 128U;
}
else {
mask = mask >> 1;
}
}
/* get ready for next row */
if (mask != 128)
src++;
}
if (count + width >= MAX_WIDTH || row + 1 == height) {
/* flush the span */
span.end = count;
if (ctx->Visual.rgbMode)
_mesa_write_rgba_span(ctx, &span);
else
_mesa_write_index_span(ctx, &span);
span.end = 0;
count = 0;
}
}
RENDER_FINISH(swrast,ctx);
}
/*
* RGBA copypixels with convolution.
*/
static void
copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height, GLint destx, GLint desty)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct gl_renderbuffer *drawRb = NULL;
GLboolean quick_draw;
GLint row;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
const GLuint transferOps = ctx->_ImageTransferState;
GLfloat *dest, *tmpImage, *convImage;
struct sw_span span;
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (swrast->_FogEnabled)
_swrast_span_default_fog(ctx, &span);
if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
&& !zoom
&& destx >= 0
&& destx + width <= (GLint) ctx->DrawBuffer->Width) {
quick_draw = GL_TRUE;
drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
}
else {
quick_draw = GL_FALSE;
}
/* allocate space for GLfloat image */
tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!tmpImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
if (!convImage) {
_mesa_free(tmpImage);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
/* read source image */
dest = tmpImage;
for (row = 0; row < height; row++) {
GLchan rgba[MAX_WIDTH][4];
/* Read GLchan and convert to GLfloat */
_swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, srcy + row, rgba);
chan_span_to_float(width, (CONST GLchan (*)[4]) rgba,
(GLfloat (*)[4]) dest);
dest += 4 * width;
}
/* do the image transfer ops which preceed convolution */
for (row = 0; row < height; row++) {
GLfloat (*rgba)[4] = (GLfloat (*)[4]) (tmpImage + row * width * 4);
_mesa_apply_rgba_transfer_ops(ctx,
transferOps & IMAGE_PRE_CONVOLUTION_BITS,
width, rgba);
}
/* do convolution */
if (ctx->Pixel.Convolution2DEnabled) {
_mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
}
else {
ASSERT(ctx->Pixel.Separable2DEnabled);
_mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
}
_mesa_free(tmpImage);
/* do remaining post-convolution image transfer ops */
for (row = 0; row < height; row++) {
GLfloat (*rgba)[4] = (GLfloat (*)[4]) (convImage + row * width * 4);
_mesa_apply_rgba_transfer_ops(ctx,
transferOps & IMAGE_POST_CONVOLUTION_BITS,
width, rgba);
}
/* write the new image */
for (row = 0; row < height; row++) {
const GLfloat *src = convImage + row * width * 4;
GLint dy;
/* convert floats back to chan */
float_span_to_chan(width, (const GLfloat (*)[4]) src, span.array->rgba);
/* write row to framebuffer */
dy = desty + row;
if (quick_draw && dy >= 0 && dy < (GLint) ctx->DrawBuffer->Height) {
drawRb->PutRow(ctx, drawRb, width, destx, dy, span.array->rgba, NULL);
}
else {
span.x = destx;
span.y = dy;
span.end = width;
if (zoom) {
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span,
(CONST GLchan (*)[4])span.array->rgba);
}
else {
_swrast_write_rgba_span(ctx, &span);
}
}
}
_mesa_free(convImage);
}
/**
* Helper function called from _swrast_write_zoomed_rgba/rgb/
* index/depth_span().
*/
static void
zoom_span( struct gl_context *ctx, GLint imgX, GLint imgY, const SWspan *span,
const GLvoid *src, GLenum format )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
SWspan zoomed;
GLint x0, x1, y0, y1;
GLint zoomedWidth;
if (!compute_zoomed_bounds(ctx, imgX, imgY, span->x, span->y, span->end,
&x0, &x1, &y0, &y1)) {
return; /* totally clipped */
}
if (!swrast->ZoomedArrays) {
/* allocate on demand */
swrast->ZoomedArrays = (SWspanarrays *) CALLOC(sizeof(SWspanarrays));
if (!swrast->ZoomedArrays)
return;
}
zoomedWidth = x1 - x0;
ASSERT(zoomedWidth > 0);
ASSERT(zoomedWidth <= MAX_WIDTH);
/* no pixel arrays! must be horizontal spans. */
ASSERT((span->arrayMask & SPAN_XY) == 0);
ASSERT(span->primitive == GL_BITMAP);
INIT_SPAN(zoomed, GL_BITMAP);
zoomed.x = x0;
zoomed.end = zoomedWidth;
zoomed.array = swrast->ZoomedArrays;
zoomed.array->ChanType = span->array->ChanType;
if (zoomed.array->ChanType == GL_UNSIGNED_BYTE)
zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba8;
else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT)
zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba16;
else
zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->attribs[FRAG_ATTRIB_COL];
COPY_4V(zoomed.attrStart[FRAG_ATTRIB_WPOS], span->attrStart[FRAG_ATTRIB_WPOS]);
COPY_4V(zoomed.attrStepX[FRAG_ATTRIB_WPOS], span->attrStepX[FRAG_ATTRIB_WPOS]);
COPY_4V(zoomed.attrStepY[FRAG_ATTRIB_WPOS], span->attrStepY[FRAG_ATTRIB_WPOS]);
zoomed.attrStart[FRAG_ATTRIB_FOGC][0] = span->attrStart[FRAG_ATTRIB_FOGC][0];
zoomed.attrStepX[FRAG_ATTRIB_FOGC][0] = span->attrStepX[FRAG_ATTRIB_FOGC][0];
zoomed.attrStepY[FRAG_ATTRIB_FOGC][0] = span->attrStepY[FRAG_ATTRIB_FOGC][0];
if (format == GL_RGBA || format == GL_RGB) {
/* copy Z info */
zoomed.z = span->z;
zoomed.zStep = span->zStep;
/* we'll generate an array of colorss */
zoomed.interpMask = span->interpMask & ~SPAN_RGBA;
zoomed.arrayMask |= SPAN_RGBA;
zoomed.arrayAttribs |= FRAG_BIT_COL; /* we'll produce these values */
ASSERT(span->arrayMask & SPAN_RGBA);
}
else if (format == GL_DEPTH_COMPONENT) {
/* Copy color info */
zoomed.red = span->red;
zoomed.green = span->green;
zoomed.blue = span->blue;
zoomed.alpha = span->alpha;
zoomed.redStep = span->redStep;
zoomed.greenStep = span->greenStep;
zoomed.blueStep = span->blueStep;
zoomed.alphaStep = span->alphaStep;
/* we'll generate an array of depth values */
zoomed.interpMask = span->interpMask & ~SPAN_Z;
zoomed.arrayMask |= SPAN_Z;
ASSERT(span->arrayMask & SPAN_Z);
}
else {
_mesa_problem(ctx, "Bad format in zoom_span");
return;
}
/* zoom the span horizontally */
if (format == GL_RGBA) {
if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {
const GLubyte (*rgba)[4] = (const GLubyte (*)[4]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
COPY_4UBV(zoomed.array->rgba8[i], rgba[j]);
}
}
else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {
const GLushort (*rgba)[4] = (const GLushort (*)[4]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
COPY_4V(zoomed.array->rgba16[i], rgba[j]);
}
}
else {
const GLfloat (*rgba)[4] = (const GLfloat (*)[4]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < span->end);
COPY_4V(zoomed.array->attribs[FRAG_ATTRIB_COL][i], rgba[j]);
}
}
}
else if (format == GL_RGB) {
if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) {
const GLubyte (*rgb)[3] = (const GLubyte (*)[3]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
zoomed.array->rgba8[i][0] = rgb[j][0];
zoomed.array->rgba8[i][1] = rgb[j][1];
zoomed.array->rgba8[i][2] = rgb[j][2];
zoomed.array->rgba8[i][3] = 0xff;
}
}
else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) {
const GLushort (*rgb)[3] = (const GLushort (*)[3]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
zoomed.array->rgba16[i][0] = rgb[j][0];
zoomed.array->rgba16[i][1] = rgb[j][1];
zoomed.array->rgba16[i][2] = rgb[j][2];
zoomed.array->rgba16[i][3] = 0xffff;
}
}
else {
const GLfloat (*rgb)[3] = (const GLfloat (*)[3]) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < span->end);
zoomed.array->attribs[FRAG_ATTRIB_COL][i][0] = rgb[j][0];
zoomed.array->attribs[FRAG_ATTRIB_COL][i][1] = rgb[j][1];
zoomed.array->attribs[FRAG_ATTRIB_COL][i][2] = rgb[j][2];
zoomed.array->attribs[FRAG_ATTRIB_COL][i][3] = 1.0F;
}
}
}
else if (format == GL_DEPTH_COMPONENT) {
const GLuint *zValues = (const GLuint *) src;
GLint i;
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x;
ASSERT(j >= 0);
ASSERT(j < (GLint) span->end);
zoomed.array->z[i] = zValues[j];
}
/* Now, fall into the RGB path below */
format = GL_RGBA;
}
/* write the span in rows [r0, r1) */
if (format == GL_RGBA || format == GL_RGB) {
/* Writing the span may modify the colors, so make a backup now if we're
* going to call _swrast_write_zoomed_span() more than once.
* Also, clipping may change the span end value, so store it as well.
*/
const GLint end = zoomed.end; /* save */
void *rgbaSave;
const GLint pixelSize =
(zoomed.array->ChanType == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) :
((zoomed.array->ChanType == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort)
: 4 * sizeof(GLfloat));
rgbaSave = malloc(zoomed.end * pixelSize);
if (!rgbaSave) {
return;
}
if (y1 - y0 > 1) {
memcpy(rgbaSave, zoomed.array->rgba, zoomed.end * pixelSize);
}
for (zoomed.y = y0; zoomed.y < y1; zoomed.y++) {
_swrast_write_rgba_span(ctx, &zoomed);
zoomed.end = end; /* restore */
if (y1 - y0 > 1) {
/* restore the colors */
memcpy(zoomed.array->rgba, rgbaSave, zoomed.end * pixelSize);
}
}
free(rgbaSave);
}
}
/*
* RGBA copypixels
*/
static void
copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height, GLint destx, GLint desty)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct gl_renderbuffer *drawRb;
GLchan *tmpImage,*p;
GLboolean quick_draw;
GLint sy, dy, stepy, j;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
const GLuint transferOps = ctx->_ImageTransferState;
struct sw_span span;
if (!ctx->ReadBuffer->_ColorReadBuffer) {
/* no readbuffer - OK */
return;
}
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_RGBA);
if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
return;
}
/* Determine if copy should be done bottom-to-top or top-to-bottom */
if (srcy < desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (swrast->_FogEnabled)
_swrast_span_default_fog(ctx, &span);
if (SWRAST_CONTEXT(ctx)->_RasterMask == 0
&& !zoom
&& destx >= 0
&& destx + width <= (GLint) ctx->DrawBuffer->Width) {
quick_draw = GL_TRUE;
drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0][0];
}
else {
quick_draw = GL_FALSE;
drawRb = NULL;
}
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLchan *) _mesa_malloc(width * height * sizeof(GLchan) * 4);
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
/* read the source image */
p = tmpImage;
for (j = 0; j < height; j++, ssy += stepy) {
_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, ssy, (GLchan (*)[4]) p );
p += width * 4;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warnings */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
/* Get source pixels */
if (overlapping) {
/* get from buffered image */
ASSERT(width < MAX_WIDTH);
_mesa_memcpy(span.array->rgba, p, width * sizeof(GLchan) * 4);
p += width * 4;
}
else {
/* get from framebuffer */
ASSERT(width < MAX_WIDTH);
_swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy, span.array->rgba );
}
if (transferOps) {
GLfloat rgbaFloat[MAX_WIDTH][4];
/* convert to float, transfer, convert back to chan */
chan_span_to_float(width, (CONST GLchan (*)[4]) span.array->rgba,
rgbaFloat);
_mesa_apply_rgba_transfer_ops(ctx, transferOps, width, rgbaFloat);
float_span_to_chan(width, (CONST GLfloat (*)[4]) rgbaFloat,
span.array->rgba);
}
/* Write color span */
if (quick_draw && dy >= 0 && dy < (GLint) ctx->DrawBuffer->Height) {
drawRb->PutRow(ctx, drawRb, width, destx, dy, span.array->rgba, NULL);
}
else {
span.x = destx;
span.y = dy;
span.end = width;
if (zoom) {
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span,
(CONST GLchan (*)[4]) span.array->rgba);
}
else {
_swrast_write_rgba_span(ctx, &span);
}
}
}
if (overlapping)
_mesa_free(tmpImage);
}
static void
copy_ci_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLuint *tmpImage,*p;
GLint sy, dy, stepy;
GLint j;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
GLint overlapping;
struct sw_span span;
if (!ctx->ReadBuffer->_ColorReadBuffer) {
/* no readbuffer - OK */
return;
}
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_INDEX);
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (srcy<desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
if (ctx->Depth.Test)
_swrast_span_default_z(ctx, &span);
if (swrast->_FogEnabled)
_swrast_span_default_fog(ctx, &span);
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLuint *) _mesa_malloc(width * height * sizeof(GLuint));
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
/* read the image */
p = tmpImage;
for (j = 0; j < height; j++, ssy += stepy) {
_swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, ssy, p );
p += width;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warning */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
/* Get color indexes */
if (overlapping) {
_mesa_memcpy(span.array->index, p, width * sizeof(GLuint));
p += width;
}
else {
_swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy, span.array->index );
}
/* Apply shift, offset, look-up table */
if (shift_or_offset) {
_mesa_shift_and_offset_ci( ctx, width, span.array->index );
}
if (ctx->Pixel.MapColorFlag) {
_mesa_map_ci( ctx, width, span.array->index );
}
/* write color indexes */
span.x = destx;
span.y = dy;
span.end = width;
if (zoom)
_swrast_write_zoomed_index_span(ctx, destx, desty, &span);
else
_swrast_write_index_span(ctx, &span);
}
if (overlapping)
_mesa_free(tmpImage);
}
static void
copy_ci_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
GLuint *tmpImage,*p;
GLint sy, dy, stepy;
GLint j;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
SWspan span;
if (!ctx->ReadBuffer->_ColorReadBuffer) {
/* no readbuffer - OK */
return;
}
INIT_SPAN(span, GL_BITMAP);
_swrast_span_default_attribs(ctx, &span);
span.arrayMask = SPAN_INDEX;
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (!overlapping && srcy < desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLuint *) _mesa_malloc(width * height * sizeof(GLuint));
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
/* read the image */
p = tmpImage;
for (j = 0; j < height; j++, ssy += stepy) {
_swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, ssy, p );
p += width;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warning */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
/* Get color indexes */
if (overlapping) {
_mesa_memcpy(span.array->index, p, width * sizeof(GLuint));
p += width;
}
else {
_swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
width, srcx, sy, span.array->index );
}
if (ctx->_ImageTransferState)
_mesa_apply_ci_transfer_ops(ctx, ctx->_ImageTransferState,
width, span.array->index);
/* write color indexes */
span.x = destx;
span.y = dy;
span.end = width;
if (zoom)
_swrast_write_zoomed_index_span(ctx, destx, desty, &span);
else
_swrast_write_index_span(ctx, &span);
}
if (overlapping)
_mesa_free(tmpImage);
}
