The extension disallows elimination of set-but-unused varyings.
---
docs/relnotes/9.2.html | 3 +++
src/mesa/state_tracker/st_extensions.c | 9 ++++++++-
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/docs/relnotes/9.2.html b/docs/relnotes/9.2.html
index 0dcc960..99f6374 100644
--- a/docs/relnotes/9.2.html
+++ b/docs/relnotes/9.2.html
@@ -63,6 +63,9 @@ Note: some of the new features are only available with
certain drivers.
<ul>
<li>Removed d3d1x state tracker (unused, unmaintained and broken)</li>
+<li>GL_EXT_separate_shader_objects has been removed from all Gallium drivers,
+ because it disallows critical GLSL shader optimizations.
+ GL_ARB_separate_shader_objects doesn't have this issue.
</ul>
</div>
diff --git a/src/mesa/state_tracker/st_extensions.c
b/src/mesa/state_tracker/st_extensions.c
index 966722c..43111d6 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -559,7 +559,14 @@ void st_init_extensions(struct st_context *st)
ctx->Extensions.EXT_point_parameters = GL_TRUE;
ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
ctx->Extensions.EXT_secondary_color = GL_TRUE;
- ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
+
+ /* IMPORTANT:
+ * Don't enable EXT_separate_shader_objects. It disallows certain
+ * optimizations in the GLSL compiler and therefore is considered
+ * harmful.
+ */
+ ctx->Extensions.EXT_separate_shader_objects = GL_FALSE;
+
ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
--
1.7.10.4
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