Give the user posibility to choose speed over correctness.

It does 2 things:
1) Allows you to disable S3TC, wine-games sometimes need S3TC enabled.
2) Disable fallbacks that usually have low impact.

3 files changed, 18 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/r300/r300_context.c b/src/mesa/drivers/dri/r300/r300_context.c
index c561b8eadb3..54eb081d055 100644
--- a/src/mesa/drivers/dri/r300/r300_context.c
+++ b/src/mesa/drivers/dri/r300/r300_context.c
@@ -331,7 +331,7 @@ GLboolean r300CreateContext(const __GLcontextModes * glVisual,
 
 	driInitExtensions(ctx, card_extensions, GL_TRUE);
 	
-	if (r300->radeon.glCtx->Mesa_DXTn) {
+	if (r300->radeon.glCtx->Mesa_DXTn && !driQueryOptionb (&r300->radeon.optionCache, "disable_s3tc")) {
 	  _mesa_enable_extension( ctx, "GL_EXT_texture_compression_s3tc" );
 	  _mesa_enable_extension( ctx, "GL_S3_s3tc" );
 	}
@@ -339,6 +339,8 @@ GLboolean r300CreateContext(const __GLcontextModes * glVisual,
 	  _mesa_enable_extension( ctx, "GL_EXT_texture_compression_s3tc" );
 	}
 
+	r300->disable_lowimpact_fallback = driQueryOptionb(&r300->radeon.optionCache, "disable_lowimpact_fallback");
+
 	radeonInitSpanFuncs(ctx);
 	r300InitCmdBuf(r300);
 	r300InitState(r300);
diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index 1acb6a6c944..17ce0d95bfe 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -820,6 +820,7 @@ struct r300_context {
 
 	GLboolean texmicrotile;
 	GLboolean span_dlocking;
+	GLboolean disable_lowimpact_fallback;
 };
 
 struct r300_buffer_object {
diff --git a/src/mesa/drivers/dri/radeon/radeon_screen.c b/src/mesa/drivers/dri/radeon/radeon_screen.c
index c58c0a57973..140d848d9ae 100644
--- a/src/mesa/drivers/dri/radeon/radeon_screen.c
+++ b/src/mesa/drivers/dri/radeon/radeon_screen.c
@@ -152,6 +152,17 @@ DRI_CONF_OPT_BEGIN_V(command_buffer_size,int,def, # min ":" # max ) \
         DRI_CONF_DESC(de,"Grösse des Befehlspuffers (in KB)") \
 DRI_CONF_OPT_END
 
+#define DRI_CONF_DISABLE_S3TC(def) \
+DRI_CONF_OPT_BEGIN(disable_s3tc,bool,def) \
+        DRI_CONF_DESC(en,"Disable S3TC compression") \
+DRI_CONF_OPT_END
+
+#define DRI_CONF_DISABLE_FALLBACK(def) \
+DRI_CONF_OPT_BEGIN(disable_lowimpact_fallback,bool,def) \
+        DRI_CONF_DESC(en,"Disable Low-impact fallback") \
+DRI_CONF_OPT_END
+
+
 const char __driConfigOptions[] =
 DRI_CONF_BEGIN
 	DRI_CONF_SECTION_PERFORMANCE
@@ -161,12 +172,14 @@ DRI_CONF_BEGIN
 		DRI_CONF_MAX_TEXTURE_IMAGE_UNITS(8, 2, 8)
 		DRI_CONF_MAX_TEXTURE_COORD_UNITS(8, 2, 8)
 		DRI_CONF_COMMAND_BUFFER_SIZE(8, 8, 32)
+		DRI_CONF_DISABLE_FALLBACK(false)
 	DRI_CONF_SECTION_END
 	DRI_CONF_SECTION_QUALITY
 		DRI_CONF_TEXTURE_DEPTH(DRI_CONF_TEXTURE_DEPTH_FB)
 		DRI_CONF_DEF_MAX_ANISOTROPY(1.0, "1.0,2.0,4.0,8.0,16.0")
 		DRI_CONF_NO_NEG_LOD_BIAS(false)
                 DRI_CONF_FORCE_S3TC_ENABLE(false)
+		DRI_CONF_DISABLE_S3TC(false)
 		DRI_CONF_COLOR_REDUCTION(DRI_CONF_COLOR_REDUCTION_DITHER)
 		DRI_CONF_ROUND_MODE(DRI_CONF_ROUND_TRUNC)
 		DRI_CONF_DITHER_MODE(DRI_CONF_DITHER_XERRORDIFF)
@@ -175,7 +188,7 @@ DRI_CONF_BEGIN
 		DRI_CONF_NO_RAST(false)
 	DRI_CONF_SECTION_END
 DRI_CONF_END;
-static const GLuint __driNConfigOptions = 14;
+static const GLuint __driNConfigOptions = 16;
 
 #ifndef RADEON_DEBUG
 int RADEON_DEBUG = 0;