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-rw-r--r--progs/glsl/multitex.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/progs/glsl/multitex.c b/progs/glsl/multitex.c
index b4be463787..bbf58af055 100644
--- a/progs/glsl/multitex.c
+++ b/progs/glsl/multitex.c
@@ -271,9 +271,24 @@ CreateProgram(const char *vertProgFile, const char *fragProgFile,
InitUniforms(program, uniforms);
+ VertCoord_attr = glGetAttribLocation_func(program, "VertCoord");
+ if (VertCoord_attr > 0) {
+ /* We want the VertCoord attrib to have position zero so that
+ * the call to glVertexAttrib(0, xyz) triggers vertex processing.
+ * Otherwise, if TexCoord0 or TexCoord1 gets position 0 we'd have
+ * to set that attribute last (which is a PITA to manage).
+ */
+ glBindAttribLocation_func(program, 0, "VertCoord");
+ /* re-link */
+ glLinkProgram_func(program);
+ /* VertCoord_attr should be zero now */
+ VertCoord_attr = glGetAttribLocation_func(program, "VertCoord");
+ assert(VertCoord_attr == 0);
+ }
+
TexCoord0_attr = glGetAttribLocation_func(program, "TexCoord0");
TexCoord1_attr = glGetAttribLocation_func(program, "TexCoord1");
- VertCoord_attr = glGetAttribLocation_func(program, "VertCoord");
+
printf("TexCoord0_attr = %d\n", TexCoord0_attr);
printf("TexCoord1_attr = %d\n", TexCoord1_attr);
printf("VertCoord_attr = %d\n", VertCoord_attr);