Mesa (master): i965: Add a driconf option to disable GL_ARB_blend_func_extended.
Kenneth Graunke
kwg at kemper.freedesktop.org
Thu Jul 19 08:22:46 UTC 2012
Module: Mesa
Branch: master
Commit: 040894391a2cf85035c6ad85f3f85c6efb23324b
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=040894391a2cf85035c6ad85f3f85c6efb23324b
Author: Kenneth Graunke <kenneth at whitecape.org>
Date: Wed Jul 18 00:07:17 2012 -0700
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: https://bugs.freedesktop.org/show_bug.cgi?id=50291
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Chad Versace <chad.versace at linux.intel.com>
Reviewed-by: Eric Anholt <eric at anholt.net>
---
src/mesa/drivers/dri/common/drirc | 4 ++++
src/mesa/drivers/dri/common/xmlpool/options.h | 10 ++++++++++
src/mesa/drivers/dri/intel/intel_extensions.c | 2 +-
src/mesa/drivers/dri/intel/intel_screen.c | 3 ++-
4 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/src/mesa/drivers/dri/common/drirc b/src/mesa/drivers/dri/common/drirc
index 2d92878..52d8dd7 100644
--- a/src/mesa/drivers/dri/common/drirc
+++ b/src/mesa/drivers/dri/common/drirc
@@ -2,15 +2,19 @@
<device screen="0" driver="i965">
<application name="Unigine Sanctuary" executable="Sanctuary">
<option name="force_glsl_extensions_warn" value="true" />
+ <option name="disable_blend_func_extended" value="true" />
</application>
<application name="Unigine Tropics" executable="Tropics">
<option name="force_glsl_extensions_warn" value="true" />
+ <option name="disable_blend_func_extended" value="true" />
</application>
<application name="Unigine Heaven (32-bit)" executable="heaven_x86">
<option name="force_glsl_extensions_warn" value="true" />
+ <option name="disable_blend_func_extended" value="true" />
</application>
<application name="Unigine Heaven (64-bit)" executable="heaven_x64">
<option name="force_glsl_extensions_warn" value="true" />
+ <option name="disable_blend_func_extended" value="true" />
</application>
</device>
</driconf>
diff --git a/src/mesa/drivers/dri/common/xmlpool/options.h b/src/mesa/drivers/dri/common/xmlpool/options.h
index 75c887e..a20e3d1 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_END
+
+#define DRI_CONF_DISABLE_BLEND_FUNC_EXTENDED(def) \
+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") \
+DRI_CONF_OPT_END
diff --git a/src/mesa/drivers/dri/intel/intel_extensions.c b/src/mesa/drivers/dri/intel/intel_extensions.c
index 844125d..c2bc072 100755
--- a/src/mesa/drivers/dri/intel/intel_extensions.c
+++ b/src/mesa/drivers/dri/intel/intel_extensions.c
@@ -104,7 +104,7 @@ intelInitExtensions(struct gl_context *ctx)
ctx->Extensions.EXT_transform_feedback = true;
if (intel->gen >= 6) {
- ctx->Extensions.ARB_blend_func_extended = true;
+ ctx->Extensions.ARB_blend_func_extended = !driQueryOptionb(&intel->optionCache, "disable_blend_func_extended");
ctx->Extensions.ARB_draw_buffers_blend = true;
}
diff --git a/src/mesa/drivers/dri/intel/intel_screen.c b/src/mesa/drivers/dri/intel/intel_screen.c
index e52bf13..81953ce 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.c
+++ b/src/mesa/drivers/dri/intel/intel_screen.c
@@ -79,6 +79,7 @@ PUBLIC const char __driConfigOptions[] =
DRI_CONF_ALWAYS_FLUSH_BATCH(false)
DRI_CONF_ALWAYS_FLUSH_CACHE(false)
DRI_CONF_FORCE_GLSL_EXTENSIONS_WARN(false)
+ DRI_CONF_DISABLE_BLEND_FUNC_EXTENDED(false)
DRI_CONF_OPT_BEGIN(stub_occlusion_query, bool, false)
DRI_CONF_DESC(en, "Enable stub ARB_occlusion_query support on 915/945.")
@@ -90,7 +91,7 @@ PUBLIC const char __driConfigOptions[] =
DRI_CONF_SECTION_END
DRI_CONF_END;
-const GLuint __driNConfigOptions = 14;
+const GLuint __driNConfigOptions = 15;
#include "intel_batchbuffer.h"
#include "intel_buffers.h"
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