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Diffstat (limited to 'src/mesa/swrast/s_span.c')
-rw-r--r--src/mesa/swrast/s_span.c350
1 files changed, 58 insertions, 292 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index 247c7ee688..8441530956 100644
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -80,7 +80,7 @@ _swrast_span_default_fog( GLcontext *ctx, struct sw_span *span )
/**
- * Init span's color or index interpolation values to the RasterPos color.
+ * Init span's rgba or index interpolation values to the RasterPos color.
* Used during setup for glDraw/CopyPixels.
*/
void
@@ -127,7 +127,10 @@ _swrast_span_default_texcoords( GLcontext *ctx, struct sw_span *span )
GLuint i;
for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
const GLfloat *tc = ctx->Current.RasterTexCoords[i];
- if (tc[3] > 0.0F) {
+ if (ctx->FragmentProgram._Enabled) {
+ COPY_4V(span->tex[i], tc);
+ }
+ else if (tc[3] > 0.0F) {
/* use (s/q, t/q, r/q, 1) */
span->tex[i][0] = tc[0] / tc[3];
span->tex[i][1] = tc[1] / tc[3];
@@ -884,7 +887,7 @@ _swrast_write_index_span( GLcontext *ctx, struct sw_span *span)
span->writeAll = GL_FALSE;
}
else {
- MEMSET(span->array->mask, 1, span->end);
+ _mesa_memset(span->array->mask, 1, span->end);
span->writeAll = GL_TRUE;
}
@@ -903,6 +906,7 @@ _swrast_write_index_span( GLcontext *ctx, struct sw_span *span)
}
#ifdef DEBUG
+ /* Make sure all fragments are within window bounds */
if (span->arrayMask & SPAN_XY) {
GLuint i;
for (i = 0; i < span->end; i++) {
@@ -1037,262 +1041,6 @@ _swrast_write_index_span( GLcontext *ctx, struct sw_span *span)
/**
- * This function may modify any of the array values in the span.
- * span->interpMask and span->arrayMask may be changed but will be restored
- * to their original values before returning.
- */
-void
-_swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span)
-{
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
- const GLuint colorMask = *((GLuint *) ctx->Color.ColorMask);
- const GLuint origInterpMask = span->interpMask;
- const GLuint origArrayMask = span->arrayMask;
- GLboolean monoColor;
-
- ASSERT(span->end <= MAX_WIDTH);
- ASSERT(span->primitive == GL_POINT || span->primitive == GL_LINE ||
- span->primitive == GL_POLYGON || span->primitive == GL_BITMAP);
- ASSERT((span->interpMask & span->arrayMask) == 0);
- ASSERT((span->interpMask | span->arrayMask) & SPAN_RGBA);
-#ifdef DEBUG
- if (ctx->Fog.Enabled)
- ASSERT((span->interpMask | span->arrayMask) & SPAN_FOG);
- if (ctx->Depth.Test)
- ASSERT((span->interpMask | span->arrayMask) & SPAN_Z);
-#endif
-
- if (span->arrayMask & SPAN_MASK) {
- /* mask was initialized by caller, probably glBitmap */
- span->writeAll = GL_FALSE;
- }
- else {
- MEMSET(span->array->mask, 1, span->end);
- span->writeAll = GL_TRUE;
- }
-
- /* Determine if we have mono-chromatic colors */
- monoColor = (span->interpMask & SPAN_RGBA) &&
- span->redStep == 0 && span->greenStep == 0 &&
- span->blueStep == 0 && span->alphaStep == 0;
-
- /* Clipping */
- if ((swrast->_RasterMask & CLIP_BIT) || (span->primitive != GL_POLYGON)) {
- if (!clip_span(ctx, span)) {
- return;
- }
- }
-
- /* Depth bounds test */
- if (ctx->Depth.BoundsTest && ctx->Visual.depthBits > 0) {
- if (!_swrast_depth_bounds_test(ctx, span)) {
- return;
- }
- }
-
-#ifdef DEBUG
- if (span->arrayMask & SPAN_XY) {
- GLuint i;
- for (i = 0; i < span->end; i++) {
- if (span->array->mask[i]) {
- assert(span->array->x[i] >= ctx->DrawBuffer->_Xmin);
- assert(span->array->x[i] < ctx->DrawBuffer->_Xmax);
- assert(span->array->y[i] >= ctx->DrawBuffer->_Ymin);
- assert(span->array->y[i] < ctx->DrawBuffer->_Ymax);
- }
- }
- }
-#endif
-
- /* Polygon Stippling */
- if (ctx->Polygon.StippleFlag && span->primitive == GL_POLYGON) {
- stipple_polygon_span(ctx, span);
- }
-
- /* Fragment program */
- if (ctx->FragmentProgram._Enabled) {
- /* Now we may need to interpolate the colors and texcoords */
- if ((span->interpMask & SPAN_RGBA) &&
- (span->arrayMask & SPAN_RGBA) == 0) {
- interpolate_colors(ctx, span);
- span->interpMask &= ~SPAN_RGBA;
- }
- if (span->interpMask & SPAN_SPEC) {
- interpolate_specular(ctx, span);
- }
- if ((span->interpMask & SPAN_TEXTURE)
- && (span->arrayMask & SPAN_TEXTURE) == 0)
- interpolate_texcoords(ctx, span);
- _swrast_exec_fragment_program(ctx, span);
- monoColor = GL_FALSE;
- }
-
- /* Do the alpha test */
- if (ctx->Color.AlphaEnabled) {
- if (!_swrast_alpha_test(ctx, span)) {
- span->interpMask = origInterpMask;
- span->arrayMask = origArrayMask;
- return;
- }
- }
-
- /* Stencil and Z testing */
- if (ctx->Stencil.Enabled || ctx->Depth.Test) {
- if (span->interpMask & SPAN_Z)
- _swrast_span_interpolate_z(ctx, span);
-
- if (ctx->Stencil.Enabled) {
- if (!_swrast_stencil_and_ztest_span(ctx, span)) {
- span->interpMask = origInterpMask;
- span->arrayMask = origArrayMask;
- return;
- }
- }
- else {
- ASSERT(ctx->Depth.Test);
- ASSERT(span->arrayMask & SPAN_Z);
- /* regular depth testing */
- if (!_swrast_depth_test_span(ctx, span)) {
- span->interpMask = origInterpMask;
- span->arrayMask = origArrayMask;
- return;
- }
- }
- }
-
- /* if we get here, something passed the depth test */
- if (ctx->Depth.OcclusionTest) {
- ctx->OcclusionResult = GL_TRUE;
- }
-
-#if FEATURE_ARB_occlusion_query
- if (ctx->Occlusion.Active) {
- /* update count of 'passed' fragments */
- GLuint i;
- for (i = 0; i < span->end; i++)
- ctx->Occlusion.PassedCounter += span->array->mask[i];
- }
-#endif
-
- /* can't abort span-writing until after occlusion testing */
- if (colorMask == 0x0) {
- span->interpMask = origInterpMask;
- span->arrayMask = origArrayMask;
- return;
- }
-
- /* Now we may need to interpolate the colors */
- if ((span->interpMask & SPAN_RGBA) && (span->arrayMask & SPAN_RGBA) == 0) {
- interpolate_colors(ctx, span);
- /* clear the bit - this allows the WriteMonoCISpan optimization below */
- span->interpMask &= ~SPAN_RGBA;
- }
-
- /* Fog */
- if (swrast->_FogEnabled) {
- _swrast_fog_rgba_span(ctx, span);
- monoColor = GL_FALSE;
- }
-
- /* Antialias coverage application */
- if (span->arrayMask & SPAN_COVERAGE) {
- GLchan (*rgba)[4] = span->array->rgba;
- GLfloat *coverage = span->array->coverage;
- GLuint i;
- for (i = 0; i < span->end; i++) {
- rgba[i][ACOMP] = (GLchan) (rgba[i][ACOMP] * coverage[i]);
- }
- monoColor = GL_FALSE;
- }
-
- if (swrast->_RasterMask & MULTI_DRAW_BIT) {
- multi_write_rgba_span(ctx, span);
- }
- else {
- /* normal: write to exactly one buffer */
- if (ctx->Color._LogicOpEnabled) {
- _swrast_logicop_rgba_span(ctx, span, span->array->rgba);
- monoColor = GL_FALSE;
- }
- else if (ctx->Color.BlendEnabled) {
- _swrast_blend_span(ctx, span, span->array->rgba);
- monoColor = GL_FALSE;
- }
-
- /* Color component masking */
- if (colorMask != 0xffffffff) {
- _swrast_mask_rgba_span(ctx, span, span->array->rgba);
- monoColor = GL_FALSE;
- }
-
- /* write pixels */
- if (span->arrayMask & SPAN_XY) {
- /* array of pixel coords */
- if (monoColor) {
- /* all pixels have same color */
- GLchan color[4];
- color[RCOMP] = FixedToChan(span->red);
- color[GCOMP] = FixedToChan(span->green);
- color[BCOMP] = FixedToChan(span->blue);
- color[ACOMP] = FixedToChan(span->alpha);
- (*swrast->Driver.WriteMonoRGBAPixels)(ctx, span->end,
- span->array->x, span->array->y, color, span->array->mask);
- if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) {
- _swrast_write_mono_alpha_pixels(ctx, span->end,
- span->array->x, span->array->y,
- color[ACOMP], span->array->mask);
- }
- }
- else {
- (*swrast->Driver.WriteRGBAPixels)(ctx, span->end,
- span->array->x, span->array->y,
- (const GLchan (*)[4]) span->array->rgba,
- span->array->mask);
- if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) {
- _swrast_write_alpha_pixels(ctx, span->end,
- span->array->x, span->array->y,
- (const GLchan (*)[4]) span->array->rgba,
- span->array->mask);
- }
- }
- }
- else {
- /* horizontal run of pixels */
- if (monoColor) {
- /* all pixels have same color */
- GLchan color[4];
- color[RCOMP] = FixedToChan(span->red);
- color[GCOMP] = FixedToChan(span->green);
- color[BCOMP] = FixedToChan(span->blue);
- color[ACOMP] = FixedToChan(span->alpha);
- (*swrast->Driver.WriteMonoRGBASpan)(ctx, span->end, span->x,
- span->y, color, span->array->mask);
- if (swrast->_RasterMask & ALPHABUF_BIT) {
- _swrast_write_mono_alpha_span(ctx, span->end, span->x, span->y,
- color[ACOMP],
- span->writeAll ? ((const GLubyte *) NULL) : span->array->mask);
- }
- }
- else {
- /* each pixel is a different color */
- (*swrast->Driver.WriteRGBASpan)(ctx, span->end, span->x, span->y,
- (const GLchan (*)[4]) span->array->rgba,
- span->writeAll ? ((const GLubyte *) NULL) : span->array->mask);
- if (swrast->_RasterMask & ALPHABUF_BIT) {
- _swrast_write_alpha_span(ctx, span->end, span->x, span->y,
- (const GLchan (*)[4]) span->array->rgba,
- span->writeAll ? ((const GLubyte *) NULL) : span->array->mask);
- }
- }
- }
- }
-
- span->interpMask = origInterpMask;
- span->arrayMask = origArrayMask;
-}
-
-
-/**
* Add specular color to base color. This is used only when
* GL_LIGHT_MODEL_COLOR_CONTROL = GL_SEPARATE_SPECULAR_COLOR.
*/
@@ -1319,12 +1067,14 @@ add_colors(GLuint n, GLchan rgba[][4], GLchan specular[][4] )
/**
+ * Apply all the per-fragment operations to a span.
+ * This now includes texturing (_swrast_write_texture_span() is history).
* This function may modify any of the array values in the span.
* span->interpMask and span->arrayMask may be changed but will be restored
* to their original values before returning.
*/
void
-_swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
+_swrast_write_rgba_span( GLcontext *ctx, struct sw_span *span)
{
const GLuint colorMask = *((GLuint *) ctx->Color.ColorMask);
SWcontext *swrast = SWRAST_CONTEXT(ctx);
@@ -1335,10 +1085,10 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
span->primitive == GL_POLYGON || span->primitive == GL_BITMAP);
ASSERT(span->end <= MAX_WIDTH);
ASSERT((span->interpMask & span->arrayMask) == 0);
- ASSERT(ctx->Texture._EnabledCoordUnits || ctx->FragmentProgram._Enabled);
/*
- printf("%s() interp 0x%x array 0x%x\n", __FUNCTION__, span->interpMask, span->arrayMask);
+ printf("%s() interp 0x%x array 0x%x\n", __FUNCTION__,
+ span->interpMask, span->arrayMask);
*/
if (span->arrayMask & SPAN_MASK) {
@@ -1346,11 +1096,11 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
span->writeAll = GL_FALSE;
}
else {
- MEMSET(span->array->mask, 1, span->end);
+ _mesa_memset(span->array->mask, 1, span->end);
span->writeAll = GL_TRUE;
}
- /* Clipping */
+ /* Clip to window/scissor box */
if ((swrast->_RasterMask & CLIP_BIT) || (span->primitive != GL_POLYGON)) {
if (!clip_span(ctx, span)) {
return;
@@ -1358,6 +1108,7 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
}
#ifdef DEBUG
+ /* Make sure all fragments are within window bounds */
if (span->arrayMask & SPAN_XY) {
GLuint i;
for (i = 0; i < span->end; i++) {
@@ -1376,28 +1127,33 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
stipple_polygon_span(ctx, span);
}
- /* Need texture coordinates now */
- if ((span->interpMask & SPAN_TEXTURE)
- && (span->arrayMask & SPAN_TEXTURE) == 0)
+ /* Interpolate texcoords? */
+ if (ctx->Texture._EnabledCoordUnits
+ && (span->interpMask & SPAN_TEXTURE)
+ && (span->arrayMask & SPAN_TEXTURE) == 0) {
interpolate_texcoords(ctx, span);
+ }
- /* Texture with alpha test */
+ /* If the alpha test is enabled, we have to compute the fragment colors
+ * at this point and do the alpha test.
+ * Else, if alpha test is not enabled, we'll try to defer fragment
+ * color computation (by interpolation, texture mapping, fragment program)
+ * until after the Z/stencil tests in the hope that many fragments will
+ * get culled, leaving less work to do.
+ */
if (ctx->Color.AlphaEnabled) {
-
/* Now we need the rgba array, fill it in if needed */
if ((span->interpMask & SPAN_RGBA) && (span->arrayMask & SPAN_RGBA) == 0)
interpolate_colors(ctx, span);
- if (span->interpMask & SPAN_SPEC) {
+ if (span->interpMask & SPAN_SPEC)
interpolate_specular(ctx, span);
- }
- /* Texturing without alpha is done after depth-testing which
- * gives a potential speed-up.
- */
+ /* Compute fragment colors with fragment program or texture lookups */
if (ctx->FragmentProgram._Enabled)
+ /* XXX interpolate depth values here??? */
_swrast_exec_fragment_program( ctx, span );
- else
+ else if (ctx->Texture._EnabledUnits)
_swrast_texture_span( ctx, span );
/* Do the alpha test */
@@ -1413,6 +1169,7 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
_swrast_span_interpolate_z(ctx, span);
if (ctx->Stencil.Enabled) {
+ /* Combined Z/stencil tests */
if (!_swrast_stencil_and_ztest_span(ctx, span)) {
span->interpMask = origInterpMask;
span->arrayMask = origArrayMask;
@@ -1420,9 +1177,9 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
}
}
else {
+ /* Just regular depth testing */
ASSERT(ctx->Depth.Test);
ASSERT(span->arrayMask & SPAN_Z);
- /* regular depth testing */
if (!_swrast_depth_test_span(ctx, span)) {
span->interpMask = origInterpMask;
span->arrayMask = origArrayMask;
@@ -1445,7 +1202,7 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
}
#endif
- /* We had to wait until now to check for glColorMask(F,F,F,F) because of
+ /* We had to wait until now to check for glColorMask(0,0,0,0) because of
* the occlusion test.
*/
if (colorMask == 0x0) {
@@ -1454,20 +1211,21 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
return;
}
- /* Texture without alpha test */
+ /* If the alpha test isn't enabled, we're able to defer computing fragment
+ * colors (by interpolation, texturing, fragment program) until now.
+ * Hopefully, Z/stencil tests culled many of the fragments!
+ */
if (!ctx->Color.AlphaEnabled) {
-
/* Now we need the rgba array, fill it in if needed */
if ((span->interpMask & SPAN_RGBA) && (span->arrayMask & SPAN_RGBA) == 0)
interpolate_colors(ctx, span);
- if (span->interpMask & SPAN_SPEC) {
+ if (span->interpMask & SPAN_SPEC)
interpolate_specular(ctx, span);
- }
if (ctx->FragmentProgram._Enabled)
_swrast_exec_fragment_program( ctx, span );
- else
+ else if (ctx->Texture._EnabledUnits)
_swrast_texture_span( ctx, span );
}
@@ -1481,8 +1239,14 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
if (span->interpMask & SPAN_SPEC) {
interpolate_specular(ctx, span);
}
- ASSERT(span->arrayMask & SPAN_SPEC);
- add_colors( span->end, span->array->rgba, span->array->spec );
+ if (span->arrayMask & SPAN_SPEC) {
+ add_colors( span->end, span->array->rgba, span->array->spec );
+ }
+ else {
+ /* We probably added the base/specular colors during the
+ * vertex stage!
+ */
+ }
}
}
@@ -1502,6 +1266,7 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
}
if (swrast->_RasterMask & MULTI_DRAW_BIT) {
+ /* need to do blend/logicop separately for each color buffer */
multi_write_rgba_span(ctx, span);
}
else {
@@ -1518,11 +1283,12 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
_swrast_mask_rgba_span(ctx, span, span->array->rgba);
}
- /* write pixels */
+ /* Finally, write the pixels to a color buffer */
if (span->arrayMask & SPAN_XY) {
/* array of pixel coords */
- (*swrast->Driver.WriteRGBAPixels)(ctx, span->end, span->array->x,
- span->array->y, (const GLchan (*)[4]) span->array->rgba, span->array->mask);
+ swrast->Driver.WriteRGBAPixels(ctx, span->end, span->array->x,
+ span->array->y, (const GLchan (*)[4]) span->array->rgba,
+ span->array->mask);
if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) {
_swrast_write_alpha_pixels(ctx, span->end,
span->array->x, span->array->y,
@@ -1532,9 +1298,9 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
}
else {
/* horizontal run of pixels */
- (*swrast->Driver.WriteRGBASpan)(ctx, span->end, span->x, span->y,
- (const GLchan (*)[4]) span->array->rgba,
- span->writeAll ? NULL : span->array->mask);
+ swrast->Driver.WriteRGBASpan(ctx, span->end, span->x, span->y,
+ (const GLchan (*)[4]) span->array->rgba,
+ span->writeAll ? NULL : span->array->mask);
if (swrast->_RasterMask & ALPHABUF_BIT) {
_swrast_write_alpha_span(ctx, span->end, span->x, span->y,
(const GLchan (*)[4]) span->array->rgba,
@@ -1555,7 +1321,7 @@ _swrast_write_texture_span( GLcontext *ctx, struct sw_span *span)
*/
void
_swrast_read_rgba_span( GLcontext *ctx, GLframebuffer *buffer,
- GLuint n, GLint x, GLint y, GLchan rgba[][4] )
+ GLuint n, GLint x, GLint y, GLchan rgba[][4] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLint bufWidth = (GLint) buffer->Width;
@@ -1609,7 +1375,7 @@ _swrast_read_rgba_span( GLcontext *ctx, GLframebuffer *buffer,
*/
void
_swrast_read_index_span( GLcontext *ctx, GLframebuffer *buffer,
- GLuint n, GLint x, GLint y, GLuint indx[] )
+ GLuint n, GLint x, GLint y, GLuint indx[] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLint bufWidth = (GLint) buffer->Width;
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-04 18:59:46 +0000