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authorBrian Paul <brian.paul@tungstengraphics.com>2008-09-17 16:48:13 -0600
committerBrian Paul <brian.paul@tungstengraphics.com>2008-09-17 16:48:13 -0600
commitd7a7b0a10dd355fbeb7a404091a42d4ab558c820 (patch)
tree6580b3dab45c18fa892e73c5ccbe99a11bc9eade
parent3b3d34d637d413af48fa5bd037b579ccb4ea7bb5 (diff)
mesa: new gl_fragment_program fields indicating use of fog, front-facing, point coord
-rw-r--r--src/mesa/main/mtypes.h5
-rw-r--r--src/mesa/shader/slang/slang_link.c50
2 files changed, 36 insertions, 19 deletions
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 2fc169493b..a5e1cf6a27 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1953,7 +1953,10 @@ struct gl_fragment_program
{
struct gl_program Base; /**< base class */
GLenum FogOption;
- GLboolean UsesKill;
+ GLboolean UsesKill; /**< shader uses KIL instruction */
+ GLboolean UsesPointCoord; /**< shader uses gl_PointCoord */
+ GLboolean UsesFrontFacing; /**< shader used gl_FrontFacing */
+ GLboolean UsesFogFragCoord; /**< shader used gl_FogFragCoord */
};
diff --git a/src/mesa/shader/slang/slang_link.c b/src/mesa/shader/slang/slang_link.c
index a44d001477..dd7d5be6d8 100644
--- a/src/mesa/shader/slang/slang_link.c
+++ b/src/mesa/shader/slang/slang_link.c
@@ -42,6 +42,24 @@
#include "slang_link.h"
+/** cast wrapper */
+static struct gl_vertex_program *
+vertex_program(struct gl_program *prog)
+{
+ assert(prog->Target == GL_VERTEX_PROGRAM_ARB);
+ return (struct gl_vertex_program *) prog;
+}
+
+
+/** cast wrapper */
+static struct gl_fragment_program *
+fragment_program(struct gl_program *prog)
+{
+ assert(prog->Target == GL_FRAGMENT_PROGRAM_ARB);
+ return (struct gl_fragment_program *) prog;
+}
+
+
/**
* Record a linking error.
*/
@@ -374,6 +392,20 @@ _slang_update_inputs_outputs(struct gl_program *prog)
for (j = 0; j < numSrc; j++) {
if (inst->SrcReg[j].File == PROGRAM_INPUT) {
prog->InputsRead |= 1 << inst->SrcReg[j].Index;
+ if (prog->Target == GL_FRAGMENT_PROGRAM_ARB &&
+ inst->SrcReg[j].Index == FRAG_ATTRIB_FOGC) {
+ /* The fragment shader FOGC input is used for fog,
+ * front-facing and sprite/point coord.
+ */
+ struct gl_fragment_program *fp = fragment_program(prog);
+ const GLint swz = GET_SWZ(inst->SrcReg[j].Swizzle, 0);
+ if (swz == SWIZZLE_X)
+ fp->UsesFogFragCoord = GL_TRUE;
+ else if (swz == SWIZZLE_Y)
+ fp->UsesFrontFacing = GL_TRUE;
+ else if (swz == SWIZZLE_Z || swz == SWIZZLE_W)
+ fp->UsesPointCoord = GL_TRUE;
+ }
}
else if (inst->SrcReg[j].File == PROGRAM_ADDRESS) {
maxAddrReg = MAX2(maxAddrReg, inst->SrcReg[j].Index + 1);
@@ -391,24 +423,6 @@ _slang_update_inputs_outputs(struct gl_program *prog)
}
-/** cast wrapper */
-static struct gl_vertex_program *
-vertex_program(struct gl_program *prog)
-{
- assert(prog->Target == GL_VERTEX_PROGRAM_ARB);
- return (struct gl_vertex_program *) prog;
-}
-
-
-/** cast wrapper */
-static struct gl_fragment_program *
-fragment_program(struct gl_program *prog)
-{
- assert(prog->Target == GL_FRAGMENT_PROGRAM_ARB);
- return (struct gl_fragment_program *) prog;
-}
-
-
/**
* Shader linker. Currently:
*