-/* $Id: s_span.c,v 1.25 2002/01/28 00:07:33 brianp Exp $ */
+/* $Id: s_span.c,v 1.26 2002/01/28 03:42:28 brianp Exp $ */
/*
* Mesa 3-D graphics library
if (ctx->Color.IndexLogicOpEnabled) {
_mesa_logicop_ci_span( ctx, n, x, y, indexTmp, mask );
}
- if (ctx->Color.IndexMask == 0) {
- break;
- }
- else if (ctx->Color.IndexMask != 0xffffffff) {
+ if (ctx->Color.IndexMask != 0xffffffff) {
_mesa_mask_index_span( ctx, n, x, y, indexTmp );
}
(*swrast->Driver.WriteCI32Span)( ctx, n, x, y, indexTmp, mask );
/*
- * Write a horizontal span of color index pixels to the frame buffer.
- * Stenciling, Depth-testing, etc. are done as needed.
- * Input: primitive - either GL_POINT, GL_LINE, GL_POLYGON, or GL_BITMAP
+ * 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
_mesa_write_index_span( GLcontext *ctx, struct sw_span *span,
GLenum primitive)
{
- const GLuint modBits = FOG_BIT | BLEND_BIT | MASKING_BIT | LOGIC_OP_BIT;
- GLuint indexBackup[MAX_WIDTH];
- GLuint *index; /* points to span->color.index or indexBackup */
SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ const GLuint origInterpMask = span->interpMask;
const GLuint origArrayMask = span->arrayMask;
+ ASSERT((span->interpMask & span->arrayMask) == 0);
+
MEMSET(span->mask, 1, span->end);
+ span->writeAll = GL_TRUE;
+ /* Window clipping */
if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
if (clip_span(ctx,span) == GL_FALSE) {
return;
}
}
- if ((primitive==GL_BITMAP && (swrast->_RasterMask & modBits))
- || (swrast->_RasterMask & MULTI_DRAW_BIT)) {
- /* Make copy of color indexes */
- MEMCPY( indexBackup, span->color.index, span->end * sizeof(GLuint) );
- index = indexBackup;
- }
- else {
- index = span->color.index;
- }
-
-
- /* Do the scissor test */
+ /* Scissor test */
if (ctx->Scissor.Enabled) {
if (_mesa_scissor_span( ctx, span ) == GL_FALSE) {
return;
stipple_polygon_span(ctx, span);
}
+ /* Depth test and stencil */
+ if (ctx->Depth.Test || ctx->Stencil.Enabled) {
+ if (span->interpMask & SPAN_Z)
+ interpolate_z(ctx, span);
- /* I have to think where to put this!! */
- if (span->interpMask & SPAN_Z)
- interpolate_z(ctx, span);
-
-
- if (ctx->Stencil.Enabled) {
- /* first stencil test */
- if (_mesa_stencil_and_ztest_span(ctx, span) == GL_FALSE) {
- span->arrayMask = origArrayMask;
- return;
+ if (ctx->Stencil.Enabled) {
+ if (_mesa_stencil_and_ztest_span(ctx, span) == GL_FALSE) {
+ span->arrayMask = origArrayMask;
+ return;
+ }
}
- }
- else if (ctx->Depth.Test) {
- /* regular depth testing */
- if (_mesa_depth_test_span(ctx, span) == 0) {
- span->arrayMask = origArrayMask;
- return;
+ else {
+ ASSERT(ctx->Depth.Test);
+ if (_mesa_depth_test_span(ctx, span) == 0) {
+ span->arrayMask = origArrayMask;
+ return;
+ }
}
}
/* if we get here, something passed the depth test */
ctx->OcclusionResult = GL_TRUE;
- if (ctx->Color.DrawBuffer == GL_NONE) {
+ /* we have to wait until after occlusion to do this test */
+ if (ctx->Color.DrawBuffer == GL_NONE || ctx->Color.IndexMask == 0) {
/* write no pixels */
span->arrayMask = origArrayMask;
return;
}
- if (span->interpMask & SPAN_INDEX)
+ /* Interpolate the color indexes if needed */
+ if (span->interpMask & SPAN_INDEX) {
interpolate_indexes(ctx, span);
+ /* clear the bit - this allows the WriteMonoCISpan optimization below */
+ span->interpMask &= ~SPAN_INDEX;
+ }
+ /* Fog */
if (ctx->Fog.Enabled) {
if ((span->arrayMask & SPAN_FOG) && !swrast->_PreferPixelFog)
- _mesa_fog_ci_pixels_with_array( ctx, span, span->fogArray, index);
+ _mesa_fog_ci_pixels_with_array( ctx, span, span->fogArray,
+ span->color.index);
else if ((span->interpMask & SPAN_FOG) && !swrast->_PreferPixelFog)
- _mesa_fog_ci_pixels( ctx, span, index);
+ _mesa_fog_ci_pixels( ctx, span, span->color.index);
else
- _mesa_depth_fog_ci_pixels( ctx, span, index);
+ _mesa_depth_fog_ci_pixels( ctx, span, span->color.index);
}
/* Antialias coverage application */
if (span->arrayMask & SPAN_COVERAGE) {
GLuint i;
+ GLuint *index = span->color.index;
for (i = 0; i < span->end; i++) {
ASSERT(span->coverage[i] < 16);
index[i] = (index[i] & ~0xf) | ((GLuint) (span->coverage[i]));
if (swrast->_RasterMask & MULTI_DRAW_BIT) {
/* draw to zero or two or more buffers */
multi_write_index_span( ctx, span->end, span->x, span->y,
- index, span->mask );
+ span->color.index, span->mask );
}
else {
/* normal situation: draw to exactly one buffer */
if (ctx->Color.IndexLogicOpEnabled) {
_mesa_logicop_ci_span( ctx, span->end, span->x, span->y,
- index, span->mask );
+ span->color.index, span->mask );
}
- if (ctx->Color.IndexMask == 0) {
- return;
- }
- else if (ctx->Color.IndexMask != 0xffffffff) {
- _mesa_mask_index_span( ctx, span->end, span->x, span->y, index );
+ if (ctx->Color.IndexMask != 0xffffffff) {
+ _mesa_mask_index_span( ctx, span->end, span->x, span->y,
+ span->color.index );
}
/* write pixels */
- (*swrast->Driver.WriteCI32Span)( ctx, span->end, span->x,
- span->y, index, span->mask );
+ if ((span->interpMask & SPAN_INDEX) && span->indexStep == 0) {
+ /* all pixels have same color index */
+ (*swrast->Driver.WriteMonoCISpan)( ctx, span->end, span->x, span->y,
+ FixedToInt(span->index),
+ span->mask );
+ }
+ else {
+ (*swrast->Driver.WriteCI32Span)( ctx, span->end, span->x, span->y,
+ span->color.index, span->mask );
+ }
}
+ span->interpMask = origInterpMask;
span->arrayMask = origArrayMask;
}
-
/*
- * Apply fragment processing to a span of RGBA fragments.
- * Input:
+ * 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
_mesa_write_rgba_span( GLcontext *ctx, struct sw_span *span,
GLenum primitive)
{
- const GLuint modBits = FOG_BIT | BLEND_BIT | MASKING_BIT |
- LOGIC_OP_BIT | TEXTURE_BIT;
- GLchan rgbaBackup[MAX_WIDTH][4];
- GLchan (*rgba)[4];
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->interpMask & span->arrayMask) == 0);
MEMSET(span->mask, 1, span->end);
+ span->writeAll = GL_TRUE;
- if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
- if (clip_span( ctx,span ) == GL_FALSE) {
+ /* Determine if we have mono-chromatic colors */
+ monoColor = (span->interpMask & SPAN_RGBA) &&
+ span->redStep == 0 && span->greenStep == 0 &&
+ span->blueStep == 0 && span->alphaStep == 0;
+
+ /* Window clipping */
+ if ((swrast->_RasterMask & WINCLIP_BIT) || primitive == GL_BITMAP) {
+ if (clip_span(ctx, span) == GL_FALSE) {
return;
}
}
- /* Do the scissor test */
+ /* Scissor test */
if (ctx->Scissor.Enabled) {
- if (_mesa_scissor_span( ctx, span ) == GL_FALSE) {
+ if (!_mesa_scissor_span(ctx, span)) {
return;
}
}
/* Polygon Stippling */
- if (ctx->Polygon.StippleFlag && primitive==GL_POLYGON) {
- stipple_polygon_span( ctx, span);
+ if (ctx->Polygon.StippleFlag && primitive == GL_POLYGON) {
+ stipple_polygon_span(ctx, span);
}
+ /* Now we may need to interpolate the colors */
if ((span->interpMask & SPAN_RGBA) && (span->arrayMask & SPAN_RGBA) == 0) {
interpolate_colors(ctx, span);
- }
-
- if ((primitive==GL_BITMAP && (swrast->_RasterMask & modBits))
- || (swrast->_RasterMask & MULTI_DRAW_BIT)) {
- /* must make a copy of the colors since they may be modified */
- MEMCPY( rgbaBackup, span->color.rgba, 4 * span->end * sizeof(GLchan) );
- rgba = rgbaBackup;
- }
- else {
- rgba = span->color.rgba;
+ /* clear the bit - this allows the WriteMonoCISpan optimization below */
+ span->interpMask &= ~SPAN_RGBA;
}
/* Do the alpha test */
if (ctx->Color.AlphaEnabled) {
- if (_mesa_alpha_test( ctx, span, (const GLchan (*)[4]) rgba) == 0) {
+ if (!_mesa_alpha_test(ctx, span,
+ (const GLchan (*)[4]) span->color.rgba)) {
+ span->interpMask = origInterpMask;
span->arrayMask = origArrayMask;
return;
}
if (ctx->Stencil.Enabled) {
if (!_mesa_stencil_and_ztest_span(ctx, span)) {
+ span->interpMask = origInterpMask;
span->arrayMask = origArrayMask;
return;
}
ASSERT(span->arrayMask & SPAN_Z);
/* regular depth testing */
if (!_mesa_depth_test_span(ctx, span)) {
+ span->interpMask = origInterpMask;
span->arrayMask = origArrayMask;
return;
}
/* if we get here, something passed the depth test */
ctx->OcclusionResult = GL_TRUE;
+ /* can't abort span-writing until after occlusion testing */
+ if (colorMask == 0x0) {
+ span->interpMask = origInterpMask;
+ span->arrayMask = origArrayMask;
+ return;
+ }
+
/* Per-pixel fog */
if (ctx->Fog.Enabled) {
- if ((span->arrayMask & SPAN_FOG) && !swrast->_PreferPixelFog)
- _mesa_fog_rgba_pixels_with_array( ctx, span, span->fogArray, rgba);
- else if ((span->interpMask & SPAN_FOG) && !swrast->_PreferPixelFog)
- _mesa_fog_rgba_pixels( ctx, span, rgba );
+ if ((span->arrayMask & SPAN_FOG) && !swrast->_PreferPixelFog)
+ _mesa_fog_rgba_pixels_with_array(ctx, span, span->fogArray,
+ span->color.rgba);
+ else if ((span->interpMask & SPAN_FOG) && !swrast->_PreferPixelFog)
+ _mesa_fog_rgba_pixels(ctx, span, span->color.rgba);
else {
if ((span->interpMask & SPAN_Z) && (span->arrayMask & SPAN_Z) == 0)
interpolate_z(ctx, span);
- _mesa_depth_fog_rgba_pixels( ctx, span, rgba );
+ _mesa_depth_fog_rgba_pixels(ctx, span, span->color.rgba);
}
+ monoColor = GL_FALSE;
}
/* Antialias coverage application */
if (span->arrayMask & SPAN_COVERAGE) {
+ GLchan (*rgba)[4] = span->color.rgba;
GLuint i;
for (i = 0; i < span->end; i++) {
rgba[i][ACOMP] = (GLchan) (rgba[i][ACOMP] * span->coverage[i]);
}
+ monoColor = GL_FALSE;
}
if (swrast->_RasterMask & MULTI_DRAW_BIT) {
- multi_write_rgba_span( ctx, span->end, span->x, span->y, (const GLchan (*)[4]) rgba, span->mask );
+ multi_write_rgba_span( ctx, span->end, span->x, span->y,
+ (const GLchan (*)[4]) span->color.rgba,
+ span->mask );
}
else {
/* normal: write to exactly one buffer */
- /* logic op or blending */
- const GLuint colorMask = *((GLuint *) ctx->Color.ColorMask);
-
if (ctx->Color.ColorLogicOpEnabled) {
- _mesa_logicop_rgba_span( ctx, span->end, span->x, span->y, rgba, span->mask );
+ _mesa_logicop_rgba_span( ctx, span->end, span->x, span->y,
+ span->color.rgba, span->mask );
+ monoColor = GL_FALSE;
}
else if (ctx->Color.BlendEnabled) {
- _mesa_blend_span( ctx, span->end, span->x, span->y, rgba, span->mask );
+ _mesa_blend_span( ctx, span->end, span->x, span->y,
+ span->color.rgba, span->mask );
+ monoColor = GL_FALSE;
}
/* Color component masking */
- if (colorMask == 0x0) {
- span->arrayMask = origArrayMask;
- return;
- }
- else if (colorMask != 0xffffffff) {
- _mesa_mask_rgba_span( ctx, span->end, span->x, span->y, rgba );
+ if (colorMask != 0xffffffff) {
+ _mesa_mask_rgba_span( ctx, span->end, span->x, span->y,
+ span->color.rgba );
+ monoColor = GL_FALSE;
}
/* write pixels */
- (*swrast->Driver.WriteRGBASpan)( ctx, span->end, span->x, span->y,
- (const GLchan (*)[4]) rgba,
- span->writeAll ? ((const GLubyte *) NULL) : span->mask );
-
- if (swrast->_RasterMask & ALPHABUF_BIT) {
- _mesa_write_alpha_span( ctx, span->end, span->x, span->y,
- (const GLchan (*)[4]) rgba,
- span->writeAll ? ((const GLubyte *) NULL) : span->mask );
- }
- }
-
- span->arrayMask = origArrayMask;
-}
-
-
-/*
- * Write a horizontal span of color pixels to the frame buffer.
- * The color is initially constant for the whole span.
- * Alpha-testing, stenciling, depth-testing, and blending are done as needed.
- * Input: r, g, b, a - the color of the pixels
- * primitive - either GL_POINT, GL_LINE, GL_POLYGON or GL_BITMAP.
- */
-void
-_mesa_write_monocolor_span( GLcontext *ctx, struct sw_span *span,
- const GLchan color[4], GLenum primitive )
-{
- const GLuint colorMask = *((GLuint *) ctx->Color.ColorMask);
- GLuint i;
- GLchan rgba[MAX_WIDTH][4];
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
- MEMSET(span->mask, 1, span->end);
-
- if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
- if (clip_span(ctx,span) == GL_FALSE) {
- return;
- }
- }
-
- /* Do the scissor test */
- if (ctx->Scissor.Enabled) {
- if (_mesa_scissor_span( ctx, span ) == GL_FALSE) {
- return;
- }
- }
-
- /* Polygon Stippling */
- if (ctx->Polygon.StippleFlag && primitive==GL_POLYGON) {
- stipple_polygon_span( ctx, span);
- }
-
- /* Do the alpha test */
- if (ctx->Color.AlphaEnabled) {
- if ((span->interpMask & SPAN_RGBA) && (span->arrayMask & SPAN_RGBA) == 0)
- interpolate_colors(ctx, span);
-
- for (i = 0; i < span->end; i++) {
- rgba[i][ACOMP] = color[ACOMP];
- }
- if (_mesa_alpha_test( ctx, span, (const GLchan (*)[4])rgba) == 0) {
- return;
- }
- }
-
- if (span->interpMask & SPAN_Z)
- interpolate_z(ctx, span);
-
- if (ctx->Stencil.Enabled) {
- /* first stencil test */
- if (_mesa_stencil_and_ztest_span(ctx, span) == GL_FALSE)
- return;
- }
- else if (ctx->Depth.Test) {
- /* regular depth testing */
- if (_mesa_depth_test_span(ctx, span) == 0)
- return;
- }
-
- /* if we get here, something passed the depth test */
- ctx->OcclusionResult = GL_TRUE;
-
- if (ctx->Color.DrawBuffer == GL_NONE) {
- /* write no pixels */
- return;
- }
-
- if (ctx->Color.ColorLogicOpEnabled ||
- colorMask != 0xffffffff ||
- (swrast->_RasterMask & (BLEND_BIT | FOG_BIT)) ||
- (span->arrayMask & SPAN_COVERAGE)) {
- /* assign same color to each pixel */
- SW_SPAN_SET_FLAG(span->filledColor);
- for (i = 0; i < span->end; i++) {
- if (span->mask[i]) {
- COPY_CHAN4(rgba[i], color);
- }
- }
-
- /* Per-pixel fog */
- if (ctx->Fog.Enabled) {
- if ((span->interpMask & SPAN_FOG) && !swrast->_PreferPixelFog)
- _mesa_fog_rgba_pixels( ctx, span, rgba );
- else
- _mesa_depth_fog_rgba_pixels( ctx, span, rgba );
- }
-
- /* Antialias coverage application */
- if (span->arrayMask & SPAN_COVERAGE) {
- GLuint i;
- for (i = 0; i < span->end; i++) {
- rgba[i][ACOMP] = (GLchan) (rgba[i][ACOMP] * span->coverage[i]);
- }
- }
-
- if (swrast->_RasterMask & MULTI_DRAW_BIT) {
- multi_write_rgba_span( ctx, span->end, span->x, span->y,
- (const GLchan (*)[4]) rgba, span->mask );
+ 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->mask);
}
else {
- /* normal: write to exactly one buffer */
- if (ctx->Color.ColorLogicOpEnabled) {
- _mesa_logicop_rgba_span( ctx, span->end, span->x, span->y,
- rgba, span->mask );
- }
- else if (ctx->Color.BlendEnabled) {
- _mesa_blend_span( ctx, span->end, span->x, span->y,
- rgba, span->mask );
- }
-
- /* Color component masking */
- if (colorMask == 0x0) {
- return;
- }
- else if (colorMask != 0xffffffff) {
- _mesa_mask_rgba_span( ctx, span->end, span->x, span->y, rgba );
- }
-
- /* write pixels */
(*swrast->Driver.WriteRGBASpan)( ctx, span->end, span->x, span->y,
- (const GLchan (*)[4]) rgba,
- span->writeAll ? ((const GLubyte *) NULL) : span->mask );
- if (swrast->_RasterMask & ALPHABUF_BIT) {
- _mesa_write_alpha_span( ctx, span->end, span->x, span->y,
- (const GLchan (*)[4]) rgba,
- span->writeAll ? ((const GLubyte *) NULL) : span->mask );
- }
+ (const GLchan (*)[4]) span->color.rgba,
+ span->writeAll ? ((const GLubyte *) NULL) : span->mask );
}
- }
- else {
- /* same color for all pixels */
- ASSERT(!ctx->Color.BlendEnabled);
- ASSERT(!ctx->Color.ColorLogicOpEnabled);
- if (swrast->_RasterMask & MULTI_DRAW_BIT) {
- SW_SPAN_SET_FLAG(span->filledColor);
- for (i = 0; i < span->end; i++) {
- if (span->mask[i]) {
- COPY_CHAN4(rgba[i], color);
- }
- }
- multi_write_rgba_span( ctx, span->end, span->x, span->y,
- (const GLchan (*)[4]) rgba, span->mask );
- }
- else {
- (*swrast->Driver.WriteMonoRGBASpan)( ctx, span->end, span->x, span->y,
- color, span->mask );
- if (swrast->_RasterMask & ALPHABUF_BIT) {
- _mesa_write_mono_alpha_span( ctx, span->end, span->x, span->y,
- (GLchan) color[ACOMP],
- span->writeAll ? ((const GLubyte *) NULL) : span->mask );
- }
+ if (swrast->_RasterMask & ALPHABUF_BIT) {
+ _mesa_write_alpha_span( ctx, span->end, span->x, span->y,
+ (const GLchan (*)[4]) span->color.rgba,
+ span->writeAll ? ((const GLubyte *) NULL) : span->mask );
}
}
-}
+ span->interpMask = origInterpMask;
+ span->arrayMask = origArrayMask;
+}
/*
/*
* This function may modify any of the array values in the span.
- * span->arrayMask, however, will not be modified (or we'll
- * restore it to the original incoming value before returning.
+ * span->interpMask and span->arrayMask may be changed but will be restored
+ * to their original values before returning.
*/
void
_mesa_write_texture_span( GLcontext *ctx, struct sw_span *span,
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLuint origArrayMask = span->arrayMask;
+ ASSERT((span->interpMask & span->arrayMask) == 0);
+
/* printf("%s() interp 0x%x array 0x%x\n", __FUNCTION__, span->interpMask, span->arrayMask);*/
ASSERT(ctx->Texture._ReallyEnabled);
MEMSET(span->mask, 1, span->end);
+ span->writeAll = GL_TRUE;
/* clip against window bounds */
if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
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