From 731701a2d256efba969cdbaf8712a28aa1a10aad Mon Sep 17 00:00:00 2001 From: Subv Date: Sun, 19 Aug 2018 00:14:34 -0500 Subject: [PATCH] Shaders: Implemented the gl_FrontFacing input attribute (attr 63). --- src/video_core/engines/shader_bytecode.h | 3 +++ src/video_core/renderer_opengl/gl_shader_decompiler.cpp | 4 ++++ 2 files changed, 7 insertions(+) diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h index b038a9d922..7e0e4858a1 100644 --- a/src/video_core/engines/shader_bytecode.h +++ b/src/video_core/engines/shader_bytecode.h @@ -79,6 +79,9 @@ union Attribute { // shader, and a tuple of (TessCoord.x, TessCoord.y, TessCoord.z, ~) when inside a Tess Eval // shader. TessCoordInstanceIDVertexID = 47, + // This attribute contains a tuple of (Unk, Unk, Unk, gl_FrontFacing) when inside a fragment + // shader. It is unknown what the other values contain. + FrontFacing = 63, }; union { diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp index bb01b3c274..48ddbc687d 100644 --- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp +++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp @@ -542,6 +542,10 @@ private: // shader. ASSERT(stage == Maxwell3D::Regs::ShaderStage::Vertex); return "vec4(0, 0, uintBitsToFloat(instance_id.x), uintBitsToFloat(gl_VertexID))"; + case Attribute::Index::FrontFacing: + // TODO(Subv): Find out what the values are for the other elements. + ASSERT(stage == Maxwell3D::Regs::ShaderStage::Fragment); + return "vec4(0, 0, 0, uintBitsToFloat(gl_FrontFacing ? 1 : 0))"; default: const u32 index{static_cast(attribute) - static_cast(Attribute::Index::Attribute_0)};