path: root/src/mesa/drivers/dri/common/xmlpool
diff options
authorKenneth Graunke <>2012-07-18 00:07:17 -0700
committerKenneth Graunke <>2012-07-19 01:22:34 -0700
commit040894391a2cf85035c6ad85f3f85c6efb23324b (patch)
tree1b7008f68569c2fadc7b4e1186866b43014ff83d /src/mesa/drivers/dri/common/xmlpool
parent768be75c44a5ce2d11306ad5eb838f0e6a614c19 (diff)
i965: Add a driconf option to disable GL_ARB_blend_func_extended.
Unigine Heaven (at least) has a bug where it incorrectly uses the GL_ARB_blend_func_extended extension. Dual source blending allows two color outputs per render target; individual shader outputs can be assigned to be either the first or second blending input by setting the 'index' via one of two methods: - An API call: glBindFragDataLocationIndexed() - The GLSL 'layout' qualifier provided by GL_ARB_explicit_attrib_location Both of these only work on user defined fragment shader outputs; it's an error to use either on built-in outputs like gl_FragData. Unigine uses gl_FragData and gl_FragColor exclusively, and doesn't even attempt to use either method to set index == 1. However, it does set the blending function to SRC1 enums, which requires a fragment shader output with index == 1 or else rendering is undefined. In other words, enabling ARB_blend_func_extended causes Unigine to render incorrectly, resulting in an apparent regression, even though our driver code (as far as I can tell) is perfectly fine. Bugzilla: Signed-off-by: Kenneth Graunke <> Reviewed-by: Chad Versace <> Reviewed-by: Eric Anholt <>
Diffstat (limited to 'src/mesa/drivers/dri/common/xmlpool')
1 files changed, 10 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/common/xmlpool/options.h b/src/mesa/drivers/dri/common/xmlpool/options.h
index 75c887e5d0..a20e3d12dc 100644
--- a/src/mesa/drivers/dri/common/xmlpool/options.h
+++ b/src/mesa/drivers/dri/common/xmlpool/options.h
@@ -636,3 +636,13 @@ DRI_CONF_OPT_BEGIN(force_glsl_extensions_warn,bool,def) \
DRI_CONF_DESC(fr,"Force GLSL extension default behavior to 'warn'") \
DRI_CONF_DESC(sv,"Force GLSL extension default behavior to 'warn'") \
+DRI_CONF_OPT_BEGIN(disable_blend_func_extended,bool,def) \
+ DRI_CONF_DESC(en,"Disable dual source blending") \
+ DRI_CONF_DESC(de,"Disable dual source blending") \
+ DRI_CONF_DESC(es,"Disable dual source blending") \
+ DRI_CONF_DESC(nl,"Disable dual source blending") \
+ DRI_CONF_DESC(fr,"Disable dual source blending") \
+ DRI_CONF_DESC(sv,"Disable dual source blending") \