OpenHarmony/third_party_mesa3d
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misc comments, clean-ups

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This commit is contained in:
Brian
2007-07-30 08:52:57 -06:00
parent baac66cb05
commit 5c6f1f542b
1 changed files with 13 additions and 9 deletions
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22
progs/glsl/points.c
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@@ -218,10 +218,13 @@ CheckLink(GLuint prog)
static void static void
Init(void) Init(void)
{ {
/* Fragment shader: compute distance of fragment from center of point, /* Fragment shader: compute distance of fragment from center of point
* if dist > 1, discard * (we're using texcoords but another varying could be used).
* if dist < k, coverage = 1 * if dist > 1, discard (coverage==0)
* else, coverage = func(dist) * if dist < k, coverage = 1
* else, coverage = func(dist)
* Note: length() uses sqrt() and may be expensive. The distance could
* be squared instead (with adjustments to the threshold (k) test)
*/ */
static const char *fragShaderText = static const char *fragShaderText =
"void main() {\n" "void main() {\n"
@@ -238,15 +241,16 @@ Init(void)
" gl_FragColor.a = cover; \n" " gl_FragColor.a = cover; \n"
"}\n"; "}\n";
/* Vertex shader: compute new vertex position based on incoming vertex pos, /* Vertex shader: compute new vertex position based on incoming vertex pos,
* texcoords and inverse viewport scale factor. * texcoords, point size, and inverse viewport scale factor.
* Note: should compute point size attenuation here too.
*/ */
static const char *vertShaderText = static const char *vertShaderText =
"uniform vec2 viewportInv; \n" "uniform vec2 viewportInv; \n"
"void main() {\n" "void main() {\n"
" vec4 p = gl_ModelViewProjectionMatrix * gl_Vertex;\n" " vec4 pos = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
" vec2 scale2 = viewportInv * gl_Point.size; \n" " gl_Position.xy = pos.xy + gl_MultiTexCoord0.xy * viewportInv \n"
" gl_Position.xy = p.xy + gl_MultiTexCoord0.xy * scale2 * p.w; \n" " * gl_Point.size * pos.w; \n"
" gl_Position.zw = p.zw; \n" " gl_Position.zw = pos.zw; \n"
" gl_TexCoord[0] = gl_MultiTexCoord0; \n" " gl_TexCoord[0] = gl_MultiTexCoord0; \n"
" gl_FrontColor = gl_Color; \n" " gl_FrontColor = gl_Color; \n"
"}\n"; "}\n";