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-rw-r--r--src/mesa/shader/slang/slang_link.c43
1 files changed, 35 insertions, 8 deletions
diff --git a/src/mesa/shader/slang/slang_link.c b/src/mesa/shader/slang/slang_link.c
index 5a9385571b..d6d1c7523e 100644
--- a/src/mesa/shader/slang/slang_link.c
+++ b/src/mesa/shader/slang/slang_link.c
@@ -114,18 +114,18 @@ link_varying_vars(struct gl_shader_program *shProg, struct gl_program *prog)
varsRead |= (1 << inst->SrcReg[j].Index);
}
}
- /* XXX update program OutputsWritten, InputsRead */
}
if (prog->Target == GL_VERTEX_PROGRAM_ARB) {
prog->OutputsWritten |= varsWritten;
+ /*printf("VERT OUTPUTS: 0x%x \n", varsWritten);*/
}
else {
assert(prog->Target == GL_FRAGMENT_PROGRAM_ARB);
prog->InputsRead |= varsRead;
+ /*printf("FRAG INPUTS: 0x%x\n", varsRead);*/
}
-
free(map);
return GL_TRUE;
@@ -453,6 +453,21 @@ fragment_program(struct gl_program *prog)
/**
+ * Record a linking error.
+ */
+static void
+link_error(struct gl_shader_program *shProg, const char *msg)
+{
+ if (shProg->InfoLog) {
+ _mesa_free(shProg->InfoLog);
+ }
+ shProg->InfoLog = _mesa_strdup(msg);
+ shProg->LinkStatus = GL_FALSE;
+}
+
+
+
+/**
* Shader linker. Currently:
*
* 1. The last attached vertex shader and fragment shader are linked.
@@ -553,18 +568,30 @@ _slang_link(GLcontext *ctx,
_slang_update_inputs_outputs(&shProg->VertexProgram->Base);
if (!(shProg->VertexProgram->Base.OutputsWritten & (1 << VERT_RESULT_HPOS))) {
/* the vertex program did not compute a vertex position */
- if (shProg->InfoLog) {
- _mesa_free(shProg->InfoLog);
- }
- shProg->InfoLog
- = _mesa_strdup("gl_Position was not written by vertex shader\n");
- shProg->LinkStatus = GL_FALSE;
+ link_error(shProg,
+ "gl_Position was not written by vertex shader\n");
return;
}
}
if (shProg->FragmentProgram)
_slang_update_inputs_outputs(&shProg->FragmentProgram->Base);
+ /* Check that all the varying vars needed by the fragment shader are
+ * actually produced by the vertex shader.
+ */
+ if (shProg->FragmentProgram) {
+ const GLbitfield varyingRead
+ = shProg->FragmentProgram->Base.InputsRead >> FRAG_ATTRIB_VAR0;
+ const GLbitfield varyingWritten = shProg->VertexProgram ?
+ shProg->VertexProgram->Base.OutputsWritten >> VERT_RESULT_VAR0 : 0x0;
+ if ((varyingRead & varyingWritten) != varyingRead) {
+ link_error(shProg,
+ "Fragment program using varying vars not written by vertex shader\n");
+ return;
+ }
+ }
+
+
if (fragProg && shProg->FragmentProgram) {
/* notify driver that a new fragment program has been compiled/linked */
ctx->Driver.ProgramStringNotify(ctx, GL_FRAGMENT_PROGRAM_ARB,