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-rw-r--r--src/glsl/link_uniforms.cpp13
1 files changed, 10 insertions, 3 deletions
diff --git a/src/glsl/link_uniforms.cpp b/src/glsl/link_uniforms.cpp
index 81a995e92bd..92e2a1fa548 100644
--- a/src/glsl/link_uniforms.cpp
+++ b/src/glsl/link_uniforms.cpp
@@ -329,9 +329,16 @@ link_assign_uniform_locations(struct gl_shader_program *prog)
prog->UniformHash = new string_to_uint_map;
}
- for (unsigned i = 0; i < Elements(prog->SamplerUnits); i++) {
- prog->SamplerUnits[i] = i;
- }
+ /* Uniforms that lack an initializer in the shader code have an initial
+ * value of zero. This includes sampler uniforms.
+ *
+ * Page 24 (page 30 of the PDF) of the GLSL 1.20 spec says:
+ *
+ * "The link time initial value is either the value of the variable's
+ * initializer, if present, or 0 if no initializer is present. Sampler
+ * types cannot have initializers."
+ */
+ memset(prog->SamplerUnits, 0, sizeof(prog->SamplerUnits));
/* First pass: Count the uniform resources used by the user-defined
* uniforms. While this happens, each active uniform will have an index