/*
* 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);
}
/**
* This isn't terribly efficient. If a driver really has combined
* depth/stencil buffers the driver should implement an optimized
* CopyPixels function.
*/
static void
copy_depth_stencil_pixels(GLcontext *ctx,
const GLint srcX, const GLint srcY,
const GLint width, const GLint height,
const GLint destX, const GLint destY)
{
struct gl_renderbuffer *stencilReadRb, *depthReadRb, *depthDrawRb;
GLint sy, dy, stepy;
GLint j;
GLstencil *tempStencilImage = NULL, *stencilPtr = NULL;
GLfloat *tempDepthImage = NULL, *depthPtr = NULL;
const GLfloat depthScale = ctx->DrawBuffer->_DepthMaxF;
const GLuint stencilMask = ctx->Stencil.WriteMask[0];
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
const GLboolean shiftOrOffset
= ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
const GLboolean scaleOrBias
= ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
GLint overlapping;
depthDrawRb = ctx->DrawBuffer->_DepthBuffer;
depthReadRb = ctx->ReadBuffer->_DepthBuffer;
stencilReadRb = ctx->ReadBuffer->_StencilBuffer;
ASSERT(depthDrawRb);
ASSERT(depthReadRb);
ASSERT(stencilReadRb);
/* 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 (overlapping) {
GLint ssy = sy;
if (stencilMask != 0x0) {
tempStencilImage
= (GLstencil *) _mesa_malloc(width * height * sizeof(GLstencil));
if (!tempStencilImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
return;
}
/* get copy of stencil pixels */
stencilPtr = tempStencilImage;
for (j = 0; j < height; j++, ssy += stepy) {
_swrast_read_stencil_span(ctx, stencilReadRb,
width, srcX, ssy, stencilPtr);
stencilPtr += width;
}
stencilPtr = tempStencilImage;
}
if (ctx->Depth.Mask) {
tempDepthImage
= (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat));
if (!tempDepthImage) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
_mesa_free(tempStencilImage);
return;
}
/* get copy of depth pixels */
depthPtr = tempDepthImage;
for (j = 0; j < height; j++, ssy += stepy) {
_swrast_read_depth_span_float(ctx, depthReadRb,
width, srcX, ssy, depthPtr);
depthPtr += width;
}
depthPtr = tempDepthImage;
}
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
if (stencilMask != 0x0) {
GLstencil stencil[MAX_WIDTH];
/* Get stencil values */
if (overlapping) {
_mesa_memcpy(stencil, stencilPtr, width * sizeof(GLstencil));
stencilPtr += width;
}
else {
_swrast_read_stencil_span(ctx, stencilReadRb,
width, srcX, sy, stencil);
}
/* Apply shift, offset, look-up table */
if (shiftOrOffset) {
_mesa_shift_and_offset_stencil(ctx, width, stencil);
}
if (ctx->Pixel.MapStencilFlag) {
_mesa_map_stencil(ctx, width, stencil);
}
/* Write values */
if (zoom) {
_swrast_write_zoomed_stencil_span(ctx, destX, destY, width,
destX, dy, stencil);
}
else {
_swrast_write_stencil_span( ctx, width, destX, dy, stencil );
}
}
if (ctx->Depth.Mask) {
GLfloat depth[MAX_WIDTH];
GLuint zVals32[MAX_WIDTH];
GLushort zVals16[MAX_WIDTH];
GLvoid *zVals;
GLuint zBytes;
/* get depth values */
if (overlapping) {
_mesa_memcpy(depth, depthPtr, width * sizeof(GLfloat));
depthPtr += width;
}
else {
_swrast_read_depth_span_float(ctx, depthReadRb,
width, srcX, sy, depth);
}
/* scale & bias */
if (scaleOrBias) {
_mesa_scale_and_bias_depth(ctx, width, depth);
}
/* convert to integer Z values */
if (depthDrawRb->DataType == GL_UNSIGNED_SHORT) {
GLint k;
for (k = 0; k < width; k++)
zVals16[k] = (GLushort) (depth[k] * depthScale);
zVals = zVals16;
zBytes = 2;
}
else {
GLint k;
for (k = 0; k < width; k++)
zVals32[k] = (GLuint) (depth[k] * depthScale);
zVals = zVals32;
zBytes = 4;
}
/* Write values */
if (zoom) {
_swrast_write_zoomed_z_span(ctx, destX, destY, width,
destX, dy, zVals);
}
else {
_swrast_put_row(ctx, depthDrawRb, width, destX, dy, zVals, zBytes);
}
}
}
if (tempStencilImage)
_mesa_free(tempStencilImage);
if (tempDepthImage)
_mesa_free(tempDepthImage);
}
/*
* 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);
}
