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Diffstat (limited to 'src/mesa/swrast/s_texture.c')
-rw-r--r--src/mesa/swrast/s_texture.c158
1 files changed, 103 insertions, 55 deletions
diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c
index a487bd8970d..e1ba9584177 100644
--- a/src/mesa/swrast/s_texture.c
+++ b/src/mesa/swrast/s_texture.c
@@ -1,4 +1,4 @@
-/* $Id: s_texture.c,v 1.56 2002/03/16 18:02:08 brianp Exp $ */
+/* $Id: s_texture.c,v 1.57 2002/03/23 16:33:53 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -2030,7 +2030,7 @@ sample_depth_texture( GLcontext *ctx, GLuint unit,
const GLuint width = texImage->Width;
const GLuint height = texImage->Height;
const GLchan ambient = tObj->ShadowAmbient;
- GLboolean lequal, gequal;
+ GLenum function;
GLchan result;
(void) unit;
@@ -2044,29 +2044,19 @@ sample_depth_texture( GLcontext *ctx, GLuint unit,
if (tObj->CompareFlag) {
/* GL_SGIX_shadow */
if (tObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) {
- lequal = GL_TRUE;
- gequal = GL_FALSE;
+ function = GL_LEQUAL;
}
else {
ASSERT(tObj->CompareOperator == GL_TEXTURE_GEQUAL_R_SGIX);
- lequal = GL_FALSE;
- gequal = GL_TRUE;
+ function = GL_GEQUAL;
}
}
else if (tObj->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
/* GL_ARB_shadow */
- if (tObj->CompareFunc == GL_LEQUAL) {
- lequal = GL_TRUE;
- gequal = GL_FALSE;
- }
- else {
- ASSERT(tObj->CompareFunc == GL_GEQUAL);
- lequal = GL_FALSE;
- gequal = GL_TRUE;
- }
+ function = tObj->CompareFunc;
}
else {
- lequal = gequal = GL_FALSE;
+ function = GL_NONE; /* pass depth through as grayscale */
}
if (tObj->MagFilter == GL_NEAREST) {
@@ -2078,21 +2068,37 @@ sample_depth_texture( GLcontext *ctx, GLuint unit,
COMPUTE_NEAREST_TEXEL_LOCATION(tObj->WrapT, texcoords[i][1], height, row);
depthSample = *((const GLfloat *) texImage->Data + row * width + col);
- if (lequal) {
- if (texcoords[i][2] <= depthSample)
- result = CHAN_MAX;
- else
- result = ambient;
- }
- else if (gequal) {
- if (texcoords[i][2] >= depthSample)
- result = CHAN_MAX;
- else
- result = ambient;
- }
- else {
- /* no comparison */
+ switch (function) {
+ case GL_LEQUAL:
+ result = (texcoords[i][2] <= depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_GEQUAL:
+ result = (texcoords[i][2] >= depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_LESS:
+ result = (texcoords[i][2] < depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_GREATER:
+ result = (texcoords[i][2] > depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_EQUAL:
+ result = (texcoords[i][2] == depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_NOTEQUAL:
+ result = (texcoords[i][2] != depthSample) ? CHAN_MAX : ambient;
+ break;
+ case GL_ALWAYS:
+ result = CHAN_MAX;
+ break;
+ case GL_NEVER:
+ result = ambient;
+ break;
+ case GL_NONE:
CLAMPED_FLOAT_TO_CHAN(result, depthSample);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad compare func in sample_depth_texture");
+ return;
}
switch (tObj->DepthMode) {
@@ -2181,8 +2187,8 @@ sample_depth_texture( GLcontext *ctx, GLuint unit,
const GLfloat w11 = ( a) * ( b);
const GLfloat depthSample = w00 * depth00 + w10 * depth10
+ w01 * depth01 + w11 * depth11;
- if ((depthSample <= texcoords[i][2] && lequal) ||
- (depthSample >= texcoords[i][2] && gequal)) {
+ if ((depthSample <= texcoords[i][2] && function == GL_LEQUAL) ||
+ (depthSample >= texcoords[i][2] && function == GL_GEQUAL)) {
result = ambient;
}
else {
@@ -2196,31 +2202,73 @@ sample_depth_texture( GLcontext *ctx, GLuint unit,
*/
const GLfloat d = (CHAN_MAXF - (GLfloat) ambient) * 0.25F;
GLfloat luminance = CHAN_MAXF;
- if (lequal) {
- if (depth00 <= texcoords[i][2]) luminance -= d;
- if (depth01 <= texcoords[i][2]) luminance -= d;
- if (depth10 <= texcoords[i][2]) luminance -= d;
- if (depth11 <= texcoords[i][2]) luminance -= d;
+
+ switch (function) {
+ case GL_LEQUAL:
+ if (depth00 <= texcoords[i][2]) luminance -= d;
+ if (depth01 <= texcoords[i][2]) luminance -= d;
+ if (depth10 <= texcoords[i][2]) luminance -= d;
+ if (depth11 <= texcoords[i][2]) luminance -= d;
result = (GLchan) luminance;
- }
- else if (gequal) {
- if (depth00 >= texcoords[i][2]) luminance -= d;
- if (depth01 >= texcoords[i][2]) luminance -= d;
- if (depth10 >= texcoords[i][2]) luminance -= d;
- if (depth11 >= texcoords[i][2]) luminance -= d;
+ break;
+ case GL_GEQUAL:
+ if (depth00 >= texcoords[i][2]) luminance -= d;
+ if (depth01 >= texcoords[i][2]) luminance -= d;
+ if (depth10 >= texcoords[i][2]) luminance -= d;
+ if (depth11 >= texcoords[i][2]) luminance -= d;
result = (GLchan) luminance;
- }
- else {
- /* no comparison, just bilinear sampling */
- const GLfloat a = FRAC(u + 1.0F);
- const GLfloat b = FRAC(v + 1.0F);
- const GLfloat w00 = (1.0F - a) * (1.0F - b);
- const GLfloat w10 = ( a) * (1.0F - b);
- const GLfloat w01 = (1.0F - a) * ( b);
- const GLfloat w11 = ( a) * ( b);
- const GLfloat depthSample = w00 * depth00 + w10 * depth10
- + w01 * depth01 + w11 * depth11;
- CLAMPED_FLOAT_TO_CHAN(result, depthSample);
+ break;
+ case GL_LESS:
+ if (depth00 < texcoords[i][2]) luminance -= d;
+ if (depth01 < texcoords[i][2]) luminance -= d;
+ if (depth10 < texcoords[i][2]) luminance -= d;
+ if (depth11 < texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_GREATER:
+ if (depth00 > texcoords[i][2]) luminance -= d;
+ if (depth01 > texcoords[i][2]) luminance -= d;
+ if (depth10 > texcoords[i][2]) luminance -= d;
+ if (depth11 > texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_EQUAL:
+ if (depth00 == texcoords[i][2]) luminance -= d;
+ if (depth01 == texcoords[i][2]) luminance -= d;
+ if (depth10 == texcoords[i][2]) luminance -= d;
+ if (depth11 == texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_NOTEQUAL:
+ if (depth00 != texcoords[i][2]) luminance -= d;
+ if (depth01 != texcoords[i][2]) luminance -= d;
+ if (depth10 != texcoords[i][2]) luminance -= d;
+ if (depth11 != texcoords[i][2]) luminance -= d;
+ result = (GLchan) luminance;
+ break;
+ case GL_ALWAYS:
+ result = 0;
+ break;
+ case GL_NEVER:
+ result = CHAN_MAXF;
+ break;
+ case GL_NONE:
+ /* ordinary bilinear filtering */
+ {
+ const GLfloat a = FRAC(u + 1.0F);
+ const GLfloat b = FRAC(v + 1.0F);
+ const GLfloat w00 = (1.0F - a) * (1.0F - b);
+ const GLfloat w10 = ( a) * (1.0F - b);
+ const GLfloat w01 = (1.0F - a) * ( b);
+ const GLfloat w11 = ( a) * ( b);
+ const GLfloat depthSample = w00 * depth00 + w10 * depth10
+ + w01 * depth01 + w11 * depth11;
+ CLAMPED_FLOAT_TO_CHAN(result, depthSample);
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "Bad compare func in sample_depth_texture");
+ return;
}
}
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