/**
* Enable or disable writing of frame buffer color components.
*
* \param red whether to mask writing of the red color component.
* \param green whether to mask writing of the green color component.
* \param blue whether to mask writing of the blue color component.
* \param alpha whether to mask writing of the alpha color component.
*
* \sa glColorMask().
*
* Sets the appropriate value of gl_colorbuffer_attrib::ColorMask. On a
* change, flushes the vertices and notifies the driver via the
* dd_function_table::ColorMask callback.
*/
void GLAPIENTRY
_mesa_ColorMask( GLboolean red, GLboolean green,
GLboolean blue, GLboolean alpha )
{
GET_CURRENT_CONTEXT(ctx);
GLubyte tmp[4];
GLuint i;
GLboolean flushed;
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glColorMask(%d, %d, %d, %d)\n",
red, green, blue, alpha);
/* Shouldn't have any information about channel depth in core mesa
* -- should probably store these as the native booleans:
*/
tmp[RCOMP] = red ? 0xff : 0x0;
tmp[GCOMP] = green ? 0xff : 0x0;
tmp[BCOMP] = blue ? 0xff : 0x0;
tmp[ACOMP] = alpha ? 0xff : 0x0;
flushed = GL_FALSE;
for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
if (!TEST_EQ_4V(tmp, ctx->Color.ColorMask[i])) {
if (!flushed) {
FLUSH_VERTICES(ctx, _NEW_COLOR);
}
flushed = GL_TRUE;
COPY_4UBV(ctx->Color.ColorMask[i], tmp);
}
}
if (ctx->Driver.ColorMask)
ctx->Driver.ColorMask( ctx, red, green, blue, alpha );
}
/**
* For GL_EXT_draw_buffers2 and GL3
*/
void GLAPIENTRY
_mesa_ColorMaski( GLuint buf, GLboolean red, GLboolean green,
GLboolean blue, GLboolean alpha )
{
GLubyte tmp[4];
GET_CURRENT_CONTEXT(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glColorMaskIndexed %u %d %d %d %d\n",
buf, red, green, blue, alpha);
if (buf >= ctx->Const.MaxDrawBuffers) {
_mesa_error(ctx, GL_INVALID_VALUE, "glColorMaskIndexed(buf=%u)", buf);
return;
}
/* Shouldn't have any information about channel depth in core mesa
* -- should probably store these as the native booleans:
*/
tmp[RCOMP] = red ? 0xff : 0x0;
tmp[GCOMP] = green ? 0xff : 0x0;
tmp[BCOMP] = blue ? 0xff : 0x0;
tmp[ACOMP] = alpha ? 0xff : 0x0;
if (TEST_EQ_4V(tmp, ctx->Color.ColorMask[buf]))
return;
FLUSH_VERTICES(ctx, _NEW_COLOR);
COPY_4UBV(ctx->Color.ColorMask[buf], tmp);
}
/**
* Enable or disable writing of frame buffer color components.
*
* \param red whether to mask writing of the red color component.
* \param green whether to mask writing of the green color component.
* \param blue whether to mask writing of the blue color component.
* \param alpha whether to mask writing of the alpha color component.
*
* \sa glColorMask().
*
* Sets the appropriate value of gl_colorbuffer_attrib::ColorMask. On a
* change, flushes the vertices and notifies the driver via the
* dd_function_table::ColorMask callback.
*/
void GLAPIENTRY
_mesa_ColorMask( GLboolean red, GLboolean green,
GLboolean blue, GLboolean alpha )
{
GET_CURRENT_CONTEXT(ctx);
GLubyte tmp[4];
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glColorMask %d %d %d %d\n", red, green, blue, alpha);
/* Shouldn't have any information about channel depth in core mesa
* -- should probably store these as the native booleans:
*/
tmp[RCOMP] = red ? 0xff : 0x0;
tmp[GCOMP] = green ? 0xff : 0x0;
tmp[BCOMP] = blue ? 0xff : 0x0;
tmp[ACOMP] = alpha ? 0xff : 0x0;
if (TEST_EQ_4UBV(tmp, ctx->Color.ColorMask))
return;
FLUSH_VERTICES(ctx, _NEW_COLOR);
COPY_4UBV(ctx->Color.ColorMask, tmp);
if (ctx->Driver.ColorMask)
ctx->Driver.ColorMask( ctx, red, green, blue, alpha );
}
/**
* 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);
}
}
static void trans_4_GLubyte_4ub(GLubyte (*t)[4],
const struct gl_client_array *from,
ARGS )
{
GLuint stride = from->StrideB;
const GLubyte *f = (GLubyte *) from->Ptr + SRC_START * stride;
const GLubyte *first = f;
GLuint i;
(void) start;
if (((((long) f | (long) stride)) & 3L) == 0L) {
/* Aligned.
*/
for (i = DST_START ; i < n ; i++, NEXT_F) {
CHECK {
NEXT_F2;
COPY_4UBV( t[i], f );
}
}
} else {
for (i = DST_START ; i < n ; i++, NEXT_F) {
static void trans_4_GLubyte_4ub_raw(GLubyte (*t)[4],
const void *Ptr,
GLuint stride,
ARGS )
{
const GLubyte *f = (GLubyte *) Ptr + SRC_START * stride;
GLuint i;
if (((((uintptr_t) f | (uintptr_t) stride)) & 3L) == 0L) {
/* Aligned.
*/
for (i = DST_START ; i < n ; i++, f += stride) {
COPY_4UBV( t[i], f );
}
} else {
for (i = DST_START ; i < n ; i++, f += stride) {
t[i][0] = f[0];
t[i][1] = f[1];
t[i][2] = f[2];
t[i][3] = f[3];
}
}
}
static void trans_4_GLubyte_4ub_raw (GLubyte (*t)[4],
const struct gl_client_array *from,
ARGS )
{
GLuint stride = from->StrideB;
const GLubyte *f = (GLubyte *) from->Ptr + SRC_START * stride;
GLuint i;
if (((((long) f | (long) stride)) & 3L) == 0L) {
/* Aligned.
*/
for (i = DST_START ; i < n ; i++, f += stride) {
COPY_4UBV( t[i], f );
}
} else {
for (i = DST_START ; i < n ; i++, f += stride) {
t[i][0] = f[0];
t[i][1] = f[1];
t[i][2] = f[2];
t[i][3] = f[3];
}
}
}
/**
* 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);
}
}
/**
* Interpolate primary colors to fill in the span->array->rgba8 (or rgb16)
* color array.
*/
static inline void
interpolate_int_colors(struct gl_context *ctx, SWspan *span)
{
#if CHAN_BITS != 32
const GLuint n = span->end;
GLuint i;
ASSERT(!(span->arrayMask & SPAN_RGBA));
#endif
switch (span->array->ChanType) {
#if CHAN_BITS != 32
case GL_UNSIGNED_BYTE:
{
GLubyte (*rgba)[4] = span->array->rgba8;
if (span->interpMask & SPAN_FLAT) {
GLubyte color[4];
color[RCOMP] = FixedToInt(span->red);
color[GCOMP] = FixedToInt(span->green);
color[BCOMP] = FixedToInt(span->blue);
color[ACOMP] = FixedToInt(span->alpha);
for (i = 0; i < n; i++) {
COPY_4UBV(rgba[i], color);
}
}
else {
GLfixed r = span->red;
GLfixed g = span->green;
GLfixed b = span->blue;
GLfixed a = span->alpha;
GLint dr = span->redStep;
GLint dg = span->greenStep;
GLint db = span->blueStep;
GLint da = span->alphaStep;
for (i = 0; i < n; i++) {
rgba[i][RCOMP] = FixedToChan(r);
rgba[i][GCOMP] = FixedToChan(g);
rgba[i][BCOMP] = FixedToChan(b);
rgba[i][ACOMP] = FixedToChan(a);
r += dr;
g += dg;
b += db;
a += da;
}
}
}
break;
case GL_UNSIGNED_SHORT:
{
GLushort (*rgba)[4] = span->array->rgba16;
if (span->interpMask & SPAN_FLAT) {
GLushort color[4];
color[RCOMP] = FixedToInt(span->red);
color[GCOMP] = FixedToInt(span->green);
color[BCOMP] = FixedToInt(span->blue);
color[ACOMP] = FixedToInt(span->alpha);
for (i = 0; i < n; i++) {
COPY_4V(rgba[i], color);
}
}
else {
GLushort (*rgba)[4] = span->array->rgba16;
GLfixed r, g, b, a;
GLint dr, dg, db, da;
r = span->red;
g = span->green;
b = span->blue;
a = span->alpha;
dr = span->redStep;
dg = span->greenStep;
db = span->blueStep;
da = span->alphaStep;
for (i = 0; i < n; i++) {
rgba[i][RCOMP] = FixedToChan(r);
rgba[i][GCOMP] = FixedToChan(g);
rgba[i][BCOMP] = FixedToChan(b);
rgba[i][ACOMP] = FixedToChan(a);
r += dr;
g += dg;
b += db;
a += da;
}
}
}
break;
#endif
case GL_FLOAT:
interpolate_active_attribs(ctx, span, FRAG_BIT_COL);
break;
default:
_mesa_problem(ctx, "bad datatype 0x%x in interpolate_int_colors",
span->array->ChanType);
}
span->arrayMask |= SPAN_RGBA;
}