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-rw-r--r--src/mesa/swrast/s_span.c283
1 files changed, 156 insertions, 127 deletions
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index 591d7d93a4..fc2a1d6633 100644
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -1,4 +1,4 @@
-/* $Id: s_span.c,v 1.4 2000/11/14 17:40:16 brianp Exp $ */
+/* $Id: s_span.c,v 1.5 2000/12/12 00:27:51 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -58,18 +58,19 @@
static void stipple_polygon_span( GLcontext *ctx,
GLuint n, GLint x, GLint y, GLubyte mask[] )
{
- register GLuint i, m, stipple, highbit=0x80000000;
+ const GLuint highbit = 0x80000000;
+ GLuint i, m, stipple;
stipple = ctx->PolygonStipple[y % 32];
m = highbit >> (GLuint) (x % 32);
- for (i=0;i<n;i++) {
- if ((m & stipple)==0) {
- mask[i] = 0;
+ for (i = 0; i < n; i++) {
+ if ((m & stipple) == 0) {
+ mask[i] = 0;
}
m = m >> 1;
- if (m==0) {
- m = 0x80000000;
+ if (m == 0) {
+ m = highbit;
}
}
}
@@ -78,41 +79,43 @@ static void stipple_polygon_span( GLcontext *ctx,
/*
* Clip a pixel span to the current buffer/window boundaries.
- * Return: 0 = all pixels clipped
- * 1 = at least one pixel is visible
+ * Return: 'n' such that pixel 'n', 'n+1' etc. are clipped,
+ * as a special case:
+ * 0 = all pixels clipped
*/
static GLuint clip_span( GLcontext *ctx,
GLint n, GLint x, GLint y, GLubyte mask[] )
{
- GLint i;
-
/* Clip to top and bottom */
if (y < 0 || y >= ctx->DrawBuffer->Height) {
return 0;
}
- /* Clip to left and right */
- if (x >= 0 && x + n <= ctx->DrawBuffer->Width) {
- /* no clipping needed */
- return 1;
- }
- else if (x + n <= 0) {
- /* completely off left side */
- return 0;
- }
- else if (x >= ctx->DrawBuffer->Width) {
- /* completely off right side */
- return 0;
+ /* Clip to the left */
+ if (x < 0) {
+ if (x + n <= 0) {
+ /* completely off left side */
+ return 0;
+ }
+ else {
+ /* partially off left side */
+ MEMSET(mask, 0, -x);
+ }
}
- else {
- /* clip-test each pixel, this could be done better */
- for (i=0;i<n;i++) {
- if (x + i < 0 || x + i >= ctx->DrawBuffer->Width) {
- mask[i] = 0;
- }
+
+ /* Clip to right */
+ if (x + n > ctx->DrawBuffer->Width) {
+ if (x >= ctx->DrawBuffer->Width) {
+ /* completely off right side */
+ return 0;
+ }
+ else {
+ /* partially off right side */
+ return ctx->DrawBuffer->Width - x;
}
- return 1;
}
+
+ return n;
}
@@ -189,7 +192,7 @@ void gl_write_index_span( GLcontext *ctx,
MEMSET(mask, 1, n);
if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
- if (clip_span(ctx,n,x,y,mask)==0) {
+ if ((n = clip_span(ctx,n,x,y,mask)) == 0) {
return;
}
}
@@ -204,17 +207,10 @@ void gl_write_index_span( GLcontext *ctx,
index = indexIn;
}
- /* Per-pixel fog */
- if (ctx->Fog.Enabled) {
- if (fog && !swrast->_PreferPixelFog)
- _mesa_fog_ci_pixels( ctx, n, fog, index );
- else
- _mesa_depth_fog_ci_pixels( ctx, n, z, index );
- }
/* Do the scissor test */
if (ctx->Scissor.Enabled) {
- if (gl_scissor_span( ctx, n, x, y, mask )==0) {
+ if (gl_scissor_span( ctx, n, x, y, mask ) == 0) {
return;
}
}
@@ -232,12 +228,21 @@ void gl_write_index_span( GLcontext *ctx,
}
else if (ctx->Depth.Test) {
/* regular depth testing */
- if (_mesa_depth_test_span( ctx, n, x, y, z, mask )==0) return;
+ if (_mesa_depth_test_span( ctx, n, x, y, z, mask ) == 0)
+ return;
}
/* if we get here, something passed the depth test */
ctx->OcclusionResult = GL_TRUE;
+ /* Per-pixel fog */
+ if (ctx->Fog.Enabled) {
+ if (fog && !swrast->_PreferPixelFog)
+ _mesa_fog_ci_pixels( ctx, n, fog, index );
+ else
+ _mesa_depth_fog_ci_pixels( ctx, n, z, index );
+ }
+
if (swrast->_RasterMask & MULTI_DRAW_BIT) {
/* draw to zero or two or more buffers */
multi_write_index_span( ctx, n, x, y, index, mask );
@@ -277,14 +282,14 @@ void gl_write_monoindex_span( GLcontext *ctx,
MEMSET(mask, 1, n);
if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
- if (clip_span( ctx, n, x, y, mask)==0) {
+ if ((n = clip_span( ctx, n, x, y, mask)) == 0) {
return;
}
}
/* Do the scissor test */
if (ctx->Scissor.Enabled) {
- if (gl_scissor_span( ctx, n, x, y, mask )==0) {
+ if (gl_scissor_span( ctx, n, x, y, mask ) == 0) {
return;
}
}
@@ -302,7 +307,8 @@ void gl_write_monoindex_span( GLcontext *ctx,
}
else if (ctx->Depth.Test) {
/* regular depth testing */
- if (_mesa_depth_test_span( ctx, n, x, y, z, mask )==0) return;
+ if (_mesa_depth_test_span( ctx, n, x, y, z, mask ) == 0)
+ return;
}
/* if we get here, something passed the depth test */
@@ -318,7 +324,7 @@ void gl_write_monoindex_span( GLcontext *ctx,
|| ctx->Color.IndexMask != 0xffffffff) {
/* different index per pixel */
GLuint indexes[MAX_WIDTH];
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
indexes[i] = index;
}
@@ -358,7 +364,7 @@ void gl_write_monoindex_span( GLcontext *ctx,
if (swrast->_RasterMask & MULTI_DRAW_BIT) {
/* draw to zero or two or more buffers */
GLuint indexes[MAX_WIDTH];
- for (i=0;i<n;i++)
+ for (i = 0; i < n; i++)
indexes[i] = index;
multi_write_index_span( ctx, n, x, y, indexes, mask );
}
@@ -458,10 +464,11 @@ void gl_write_rgba_span( GLcontext *ctx,
MEMSET(mask, 1, n);
if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
- if (clip_span( ctx,n,x,y,mask)==0) {
- return;
+ if ((n = clip_span( ctx,n,x,y,mask)) == 0) {
+ return;
}
- write_all = GL_FALSE;
+ if (mask[0] == 0)
+ write_all = GL_FALSE;
}
if ((primitive==GL_BITMAP && (swrast->_RasterMask & modBits))
@@ -474,17 +481,9 @@ void gl_write_rgba_span( GLcontext *ctx,
rgba = rgbaIn;
}
- /* Per-pixel fog */
- if (ctx->Fog.Enabled) {
- if (fog && !swrast->_PreferPixelFog)
- _mesa_fog_rgba_pixels( ctx, n, fog, rgba );
- else
- _mesa_depth_fog_rgba_pixels( ctx, n, z, rgba );
- }
-
/* Do the scissor test */
if (ctx->Scissor.Enabled) {
- if (gl_scissor_span( ctx, n, x, y, mask )==0) {
+ if (gl_scissor_span( ctx, n, x, y, mask ) == 0) {
return;
}
write_all = GL_FALSE;
@@ -498,7 +497,7 @@ void gl_write_rgba_span( GLcontext *ctx,
/* Do the alpha test */
if (ctx->Color.AlphaEnabled) {
- if (_mesa_alpha_test( ctx, n, (const GLchan (*)[4]) rgba, mask )==0) {
+ if (_mesa_alpha_test( ctx, n, (const GLchan (*)[4]) rgba, mask ) == 0) {
return;
}
write_all = GL_FALSE;
@@ -514,10 +513,10 @@ void gl_write_rgba_span( GLcontext *ctx,
else if (ctx->Depth.Test) {
/* regular depth testing */
GLuint m = _mesa_depth_test_span( ctx, n, x, y, z, mask );
- if (m==0) {
+ if (m == 0) {
return;
}
- if (m<n) {
+ if (m < n) {
write_all = GL_FALSE;
}
}
@@ -525,6 +524,14 @@ void gl_write_rgba_span( GLcontext *ctx,
/* if we get here, something passed the depth test */
ctx->OcclusionResult = GL_TRUE;
+ /* Per-pixel fog */
+ if (ctx->Fog.Enabled) {
+ if (fog && !swrast->_PreferPixelFog)
+ _mesa_fog_rgba_pixels( ctx, n, fog, rgba );
+ else
+ _mesa_depth_fog_rgba_pixels( ctx, n, z, rgba );
+ }
+
if (swrast->_RasterMask & MULTI_DRAW_BIT) {
multi_write_rgba_span( ctx, n, x, y, (const GLchan (*)[4]) rgba, mask );
}
@@ -558,7 +565,6 @@ void gl_write_rgba_span( GLcontext *ctx,
(const GLchan (*)[4]) rgba,
write_all ? Null : mask );
}
-
}
}
@@ -592,15 +598,16 @@ void gl_write_monocolor_span( GLcontext *ctx,
MEMSET(mask, 1, n);
if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
- if (clip_span( ctx,n,x,y,mask)==0) {
+ if ((n = clip_span( ctx,n,x,y,mask)) == 0) {
return;
}
- write_all = GL_FALSE;
+ if (mask[0] == 0)
+ write_all = GL_FALSE;
}
/* Do the scissor test */
if (ctx->Scissor.Enabled) {
- if (gl_scissor_span( ctx, n, x, y, mask )==0) {
+ if (gl_scissor_span( ctx, n, x, y, mask ) == 0) {
return;
}
write_all = GL_FALSE;
@@ -614,10 +621,10 @@ void gl_write_monocolor_span( GLcontext *ctx,
/* Do the alpha test */
if (ctx->Color.AlphaEnabled) {
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
rgba[i][ACOMP] = color[ACOMP];
}
- if (_mesa_alpha_test( ctx, n, (const GLchan (*)[4])rgba, mask )==0) {
+ if (_mesa_alpha_test( ctx, n, (const GLchan (*)[4])rgba, mask ) == 0) {
return;
}
write_all = GL_FALSE;
@@ -633,10 +640,10 @@ void gl_write_monocolor_span( GLcontext *ctx,
else if (ctx->Depth.Test) {
/* regular depth testing */
GLuint m = _mesa_depth_test_span( ctx, n, x, y, z, mask );
- if (m==0) {
+ if (m == 0) {
return;
}
- if (m<n) {
+ if (m < n) {
write_all = GL_FALSE;
}
}
@@ -652,7 +659,7 @@ void gl_write_monocolor_span( GLcontext *ctx,
if (ctx->Color.ColorLogicOpEnabled || colorMask != 0xffffffff ||
(swrast->_RasterMask & (BLEND_BIT | FOG_BIT))) {
/* assign same color to each pixel */
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
if (mask[i]) {
COPY_CHAN4(rgba[i], color);
}
@@ -704,7 +711,7 @@ void gl_write_monocolor_span( GLcontext *ctx,
ASSERT(!ctx->Color.ColorLogicOpEnabled);
if (swrast->_RasterMask & MULTI_DRAW_BIT) {
- for (i=0;i<n;i++) {
+ for (i = 0; i < n; i++) {
if (mask[i]) {
COPY_CHAN4(rgba[i], color);
}
@@ -731,7 +738,7 @@ void gl_write_monocolor_span( GLcontext *ctx,
static void add_colors(GLuint n, GLchan rgba[][4], CONST GLchan specular[][4] )
{
GLuint i;
- for (i=0; i<n; i++) {
+ for (i = 0; i < n; i++) {
GLint r = rgba[i][RCOMP] + specular[i][RCOMP];
GLint g = rgba[i][GCOMP] + specular[i][GCOMP];
GLint b = rgba[i][BCOMP] + specular[i][BCOMP];
@@ -775,10 +782,11 @@ void gl_write_texture_span( GLcontext *ctx,
MEMSET(mask, 1, n);
if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
- if (clip_span(ctx, n, x, y, mask)==0) {
+ if ((n=clip_span(ctx, n, x, y, mask)) == 0) {
return;
}
- write_all = GL_FALSE;
+ if (mask[0] == 0)
+ write_all = GL_FALSE;
}
@@ -791,27 +799,9 @@ void gl_write_texture_span( GLcontext *ctx,
rgba = rgbaIn;
}
- /* Texture */
- ASSERT(ctx->Texture._ReallyEnabled);
- gl_texture_pixels( ctx, 0, n, s, t, u, lambda, rgba, rgba );
-
- /* Add base and specular colors */
- if (spec &&
- (ctx->Fog.ColorSumEnabled ||
- (ctx->Light.Enabled && ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)))
- add_colors( n, rgba, spec ); /* rgba = rgba + spec */
-
- /* Per-pixel fog */
- if (ctx->Fog.Enabled) {
- if (fog && !swrast->_PreferPixelFog)
- _mesa_fog_rgba_pixels( ctx, n, fog, rgba );
- else
- _mesa_depth_fog_rgba_pixels( ctx, n, z, rgba );
- }
-
/* Do the scissor test */
if (ctx->Scissor.Enabled) {
- if (gl_scissor_span( ctx, n, x, y, mask )==0) {
+ if (gl_scissor_span( ctx, n, x, y, mask ) == 0) {
return;
}
write_all = GL_FALSE;
@@ -822,11 +812,17 @@ void gl_write_texture_span( GLcontext *ctx,
stipple_polygon_span( ctx, n, x, y, mask );
write_all = GL_FALSE;
}
-
- /* Do the alpha test */
+
+ /* Texture with alpha test*/
if (ctx->Color.AlphaEnabled) {
- if (_mesa_alpha_test( ctx, n, (const GLchan (*)[4]) rgba, mask )==0) {
- return;
+ /* Texturing without alpha is done after depth-testing which
+ gives a potential speed-up. */
+ ASSERT(ctx->Texture._ReallyEnabled);
+ gl_texture_pixels( ctx, 0, n, s, t, u, lambda, rgba, rgba );
+
+ /* Do the alpha test */
+ if (_mesa_alpha_test( ctx, n, (const GLchan (*)[4]) rgba, mask ) == 0) {
+ return;
}
write_all = GL_FALSE;
}
@@ -841,10 +837,10 @@ void gl_write_texture_span( GLcontext *ctx,
else if (ctx->Depth.Test) {
/* regular depth testing */
GLuint m = _mesa_depth_test_span( ctx, n, x, y, z, mask );
- if (m==0) {
+ if (m == 0) {
return;
}
- if (m<n) {
+ if (m < n) {
write_all = GL_FALSE;
}
}
@@ -852,6 +848,26 @@ void gl_write_texture_span( GLcontext *ctx,
/* if we get here, something passed the depth test */
ctx->OcclusionResult = GL_TRUE;
+ /* Texture without alpha test */
+ if (! ctx->Color.AlphaEnabled) {
+ ASSERT(ctx->Texture._ReallyEnabled);
+ gl_texture_pixels( ctx, 0, n, s, t, u, lambda, rgba, rgba );
+ }
+
+ /* Add base and specular colors */
+ if (spec &&
+ (ctx->Fog.ColorSumEnabled ||
+ (ctx->Light.Enabled && ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)))
+ add_colors( n, rgba, spec ); /* rgba = rgba + spec */
+
+ /* Per-pixel fog */
+ if (ctx->Fog.Enabled) {
+ if (fog && !swrast->_PreferPixelFog)
+ _mesa_fog_rgba_pixels( ctx, n, fog, rgba );
+ else
+ _mesa_depth_fog_rgba_pixels( ctx, n, z, rgba );
+ }
+
if (swrast->_RasterMask & MULTI_DRAW_BIT) {
multi_write_rgba_span( ctx, n, x, y, (const GLchan (*)[4]) rgba, mask );
}
@@ -910,10 +926,11 @@ gl_write_multitexture_span( GLcontext *ctx,
MEMSET(mask, 1, n);
if ((swrast->_RasterMask & WINCLIP_BIT) || primitive==GL_BITMAP) {
- if (clip_span(ctx, n, x, y, mask)==0) {
+ if ((n=clip_span(ctx, n, x, y, mask)) == 0) {
return;
}
- write_all = GL_FALSE;
+ if (mask[0] == 0)
+ write_all = GL_FALSE;
}
@@ -927,29 +944,9 @@ gl_write_multitexture_span( GLcontext *ctx,
rgba = rgbaIn;
}
- /* Texture */
- ASSERT(ctx->Texture._ReallyEnabled);
- for (i = 0; i < texUnits; i++)
- gl_texture_pixels( ctx, i, n, s[i], t[i], u[i], lambda[i], rgbaIn, rgba );
-
- /* Add base and specular colors */
- if (spec &&
- (ctx->Fog.ColorSumEnabled ||
- (ctx->Light.Enabled &&
- ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)))
- add_colors( n, rgba, spec ); /* rgba = rgba + spec */
-
- /* Per-pixel fog */
- if (ctx->Fog.Enabled) {
- if (fog && !swrast->_PreferPixelFog)
- _mesa_fog_rgba_pixels( ctx, n, fog, rgba );
- else
- _mesa_depth_fog_rgba_pixels( ctx, n, z, rgba );
- }
-
/* Do the scissor test */
if (ctx->Scissor.Enabled) {
- if (gl_scissor_span( ctx, n, x, y, mask )==0) {
+ if (gl_scissor_span( ctx, n, x, y, mask ) == 0) {
return;
}
write_all = GL_FALSE;
@@ -961,10 +958,18 @@ gl_write_multitexture_span( GLcontext *ctx,
write_all = GL_FALSE;
}
- /* Do the alpha test */
+ /* Texture with alpha test*/
if (ctx->Color.AlphaEnabled) {
- if (_mesa_alpha_test( ctx, n, (const GLchan (*)[4])rgba, mask )==0) {
- return;
+ /* Texturing without alpha is done after depth-testing which
+ * gives a potential speed-up.
+ */
+ ASSERT(ctx->Texture._ReallyEnabled);
+ for (i = 0; i < texUnits; i++)
+ gl_texture_pixels( ctx, i, n, s[i], t[i], u[i], lambda[i], rgbaIn, rgba );
+
+ /* Do the alpha test */
+ if (_mesa_alpha_test( ctx, n, (const GLchan (*)[4])rgba, mask ) == 0) {
+ return;
}
write_all = GL_FALSE;
}
@@ -979,10 +984,10 @@ gl_write_multitexture_span( GLcontext *ctx,
else if (ctx->Depth.Test) {
/* regular depth testing */
GLuint m = _mesa_depth_test_span( ctx, n, x, y, z, mask );
- if (m==0) {
+ if (m == 0) {
return;
}
- if (m<n) {
+ if (m < n) {
write_all = GL_FALSE;
}
}
@@ -990,6 +995,29 @@ gl_write_multitexture_span( GLcontext *ctx,
/* if we get here, something passed the depth test */
ctx->OcclusionResult = GL_TRUE;
+ /* Texture without alpha test */
+ if (! ctx->Color.AlphaEnabled) {
+ ASSERT(ctx->Texture._ReallyEnabled);
+ for (i = 0; i < texUnits; i++)
+ gl_texture_pixels( ctx, i, n, s[i], t[i], u[i],
+ lambda[i], rgbaIn, rgba );
+ }
+
+ /* Add base and specular colors */
+ if (spec &&
+ (ctx->Fog.ColorSumEnabled ||
+ (ctx->Light.Enabled &&
+ ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)))
+ add_colors( n, rgba, spec ); /* rgba = rgba + spec */
+
+ /* Per-pixel fog */
+ if (ctx->Fog.Enabled) {
+ if (fog && !swrast->_PreferPixelFog)
+ _mesa_fog_rgba_pixels( ctx, n, fog, rgba );
+ else
+ _mesa_depth_fog_rgba_pixels( ctx, n, z, rgba );
+ }
+
if (swrast->_RasterMask & MULTI_DRAW_BIT) {
multi_write_rgba_span( ctx, n, x, y, (const GLchan (*)[4]) rgba, mask );
}
@@ -1011,7 +1039,8 @@ gl_write_multitexture_span( GLcontext *ctx,
_mesa_mask_rgba_span( ctx, n, x, y, rgba );
}
- (*ctx->Driver.WriteRGBASpan)( ctx, n, x, y, (const GLchan (*)[4])rgba, write_all ? Null : mask );
+ (*ctx->Driver.WriteRGBASpan)( ctx, n, x, y, (const GLchan (*)[4])rgba,
+ write_all ? Null : mask );
if (swrast->_RasterMask & ALPHABUF_BIT) {
_mesa_write_alpha_span( ctx, n, x, y, (const GLchan (*)[4])rgba,
write_all ? Null : mask );
generated by cgit v1.2.3 (git 2.51.0) at 2025-10-31 20:09:21 +0000