From 4e35177e23069ad7a4cb0fdfa2ad5b34300c44f7 Mon Sep 17 00:00:00 2001 From: ReinUsesLisp Date: Fri, 9 Aug 2019 23:50:21 -0300 Subject: shader_ir: Implement VOTE Implement VOTE using Nvidia's intrinsics. Documentation about these can be found here https://developer.nvidia.com/reading-between-threads-shader-intrinsics Instead of using portable ARB instructions I opted to use Nvidia intrinsics because these are the closest we have to how Tegra X1 hardware renders. To stub VOTE on non-Nvidia drivers (including nouveau) this commit simulates a GPU with a warp size of one, returning what is meaningful for the instruction being emulated: * anyThreadNV(value) -> value * allThreadsNV(value) -> value * allThreadsEqualNV(value) -> true ballotARB, also known as "uint64_t(activeThreadsNV())", emits VOTE.ANY Rd, PT, PT; on nouveau's compiler. This doesn't match exactly to Nvidia's code VOTE.ALL Rd, PT, PT; Which is emulated with activeThreadsNV() by this commit. In theory this shouldn't really matter since .ANY, .ALL and .EQ affect the predicates (set to PT on those cases) and not the registers. --- src/video_core/renderer_opengl/gl_device.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'src/video_core/renderer_opengl/gl_device.h') diff --git a/src/video_core/renderer_opengl/gl_device.h b/src/video_core/renderer_opengl/gl_device.h index dc883722d..3ef7c6dd8 100644 --- a/src/video_core/renderer_opengl/gl_device.h +++ b/src/video_core/renderer_opengl/gl_device.h @@ -30,6 +30,10 @@ public: return max_varyings; } + bool HasWarpIntrinsics() const { + return has_warp_intrinsics; + } + bool HasVertexViewportLayer() const { return has_vertex_viewport_layer; } @@ -50,6 +54,7 @@ private: std::size_t shader_storage_alignment{}; u32 max_vertex_attributes{}; u32 max_varyings{}; + bool has_warp_intrinsics{}; bool has_vertex_viewport_layer{}; bool has_variable_aoffi{}; bool has_component_indexing_bug{}; -- cgit v1.2.3