From c6537ac8b8130cf2271c8d1e51137a575073c762 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Tue, 30 Dec 2008 17:11:32 -0700 Subject: mesa: allow variable indexing into the predefined uniform variable arrays This allows code such as "vec4 a = gl_LightSource[i].ambient;" to work. When a built-in uniform array is indexed with a variable index we need to "unroll" the whole array into the parameter list (aka constant buffer) because we don't know which elements may be accessed at compile-time. In the case of the gl_LightSource array of size [8], we emit 64 state references into the parameter array (8 elements times 8 vec4s per gl_LightSourceParameters struct). Previously, we only allowed constant-indexed references to uniform arrays (such as gl_LightSource[2].position) which resulted in a single state reference being added to the parameter array, not 64. We still optimize this case. Users should be aware that using "gl_LightSource[i].ambient" in their shaders is a bit expensive since state validation will involve updating all 64 light source entries in the parameter list. --- .../shader/slang/library/slang_common_builtin.gc | 12 ++- .../shader/slang/library/slang_common_builtin_gc.h | 102 ++++++++++----------- 2 files changed, 60 insertions(+), 54 deletions(-) (limited to 'src/mesa/shader/slang/library') diff --git a/src/mesa/shader/slang/library/slang_common_builtin.gc b/src/mesa/shader/slang/library/slang_common_builtin.gc index a051c53eea..3e03b101b8 100644 --- a/src/mesa/shader/slang/library/slang_common_builtin.gc +++ b/src/mesa/shader/slang/library/slang_common_builtin.gc @@ -1,8 +1,9 @@ /* * Mesa 3-D graphics library - * Version: 6.5 + * Version: 7.3 * * Copyright (C) 2006 Brian Paul All Rights Reserved. + * Copyright (C) 2008 VMware, Inc. All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), @@ -98,6 +99,9 @@ struct gl_MaterialParameters { uniform gl_MaterialParameters gl_FrontMaterial; uniform gl_MaterialParameters gl_BackMaterial; +/* NOTE: the order of these fields is significant! + * See the definition of the lighting state vars such as STATE_SPOT_DIRECTION. + */ struct gl_LightSourceParameters { vec4 ambient; vec4 diffuse; @@ -105,12 +109,14 @@ struct gl_LightSourceParameters { vec4 position; vec4 halfVector; vec3 spotDirection; - float spotExponent; - float spotCutoff; float spotCosCutoff; + float constantAttenuation; float linearAttenuation; float quadraticAttenuation; + float spotExponent; + + float spotCutoff; }; uniform gl_LightSourceParameters gl_LightSource[gl_MaxLights]; diff --git a/src/mesa/shader/slang/library/slang_common_builtin_gc.h 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