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authorKenneth Graunke <[email protected]>2019-11-21 16:11:15 -0800
committerKenneth Graunke <[email protected]>2019-11-27 18:48:04 +0000
commit9b577f2a887968483b88b629673d3f9904a179ff (patch)
tree22e850fb65785eb90dd4f10b27b7ced3dffb97c3 /src/mesa/main
parent424d5e4e11d16c789cf4a724d6b8aa3d77223ec4 (diff)
driconf, glsl: Add a vs_position_always_invariant option
Many applications use multi-pass rendering and require their vertex shader position to be computed the same way each time. Optimizations may consider, say, fusing a multiply-add based on global usage of an expression in a shader. But a second shader with the same expression may have different code, causing that optimization to make the other choice the second time around. The correct solution is for applications to mark their VS outputs 'invariant', indicating they need multiple shaders to compute that output in the same manner. However, most applications fail to do so. So, we add a new driconf option - vs_position_always_invariant - which forces the gl_Position output in vertex shaders to be marked invariant. Fixes: 7025dbe794b ("nir: Skip emitting no-op movs from the builder.") Reviewed-by: Eric Anholt <[email protected]> Reviewed-by: Ian Romanick <[email protected]>
Diffstat (limited to 'src/mesa/main')
-rw-r--r--src/mesa/main/mtypes.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 9facc022cec..e17ae1fa519 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -3194,6 +3194,9 @@ struct gl_shader_compiler_options
/** Clamp UBO and SSBO block indices so they don't go out-of-bounds. */
GLboolean ClampBlockIndicesToArrayBounds;
+ /** (driconf) Force gl_Position to be considered invariant */
+ GLboolean PositionAlwaysInvariant;
+
const struct nir_shader_compiler_options *NirOptions;
};