[Mesa-dev] [PATCH 3/4] glsl: Fix incorrect hard-coded location of the gl_SecondaryFragColorEXT built-in.

[Francisco Jerez]

gl_SecondaryFragColorEXT should have the same location as gl_FragColor
for the secondary fragment color to be replicated to all fragment
outputs.  The incorrect location of gl_SecondaryFragColorEXT would
cause the linker to mark both FRAG_RESULT_COLOR and FRAG_RESULT_DATA0
as being written to, which isn't allowed by the spec and would
ultimately lead to an assertion failure in
fs_visitor::emit_fb_writes() on my i965-fb-fetch branch.

This should also fix the code below for multiple dual-source-blended
render targets, which no driver currently supports but we have plans
to enable eventually in the i965 driver (the comment saying that no
hardware will ever support it seems rather hilarious).
---
 src/compiler/glsl/builtin_variables.cpp | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/src/compiler/glsl/builtin_variables.cpp b/src/compiler/glsl/builtin_variables.cpp
index d379de6..f4ddeb9 100644
--- a/src/compiler/glsl/builtin_variables.cpp
+++ b/src/compiler/glsl/builtin_variables.cpp
@@ -1147,13 +1147,8 @@ builtin_variable_generator::generate_fs_special_vars()
    }
 
    if (state->es_shader && state->language_version == 100 && state->EXT_blend_func_extended_enable) {
-      /* We make an assumption here that there will only ever be one dual-source draw buffer
-       * In case this assumption is ever proven to be false, make sure to assert here
-       * since we don't handle this case.
-       * In practice, this issue will never arise since no hardware will support it.
-       */
-      assert(state->Const.MaxDualSourceDrawBuffers <= 1);
-      add_index_output(FRAG_RESULT_DATA0, 1, vec4_t, "gl_SecondaryFragColorEXT");
+      add_index_output(FRAG_RESULT_COLOR, 1, vec4_t,
+                       "gl_SecondaryFragColorEXT");
       add_index_output(FRAG_RESULT_DATA0, 1,
                        array(vec4_t, state->Const.MaxDualSourceDrawBuffers),
                        "gl_SecondaryFragDataEXT");
-- 
2.9.0