From c9b511da084bcf1655a7e844ee0d80e46ce681c9 Mon Sep 17 00:00:00 2001
From: Subv <subv2112@gmail.com>
Date: Sat, 14 Apr 2018 11:50:15 -0500
Subject: [PATCH] GPU: Upload the entirety of each constbuffer for each shader
stage as SSBOs.
We're going to need the shader generator to give us a mapping of the actual used const buffers to properly bind them to the shader.
---
.../renderer_opengl/gl_rasterizer.cpp | 39 ++++++++++++++++++-
.../renderer_opengl/gl_rasterizer.h | 7 +++-
.../renderer_opengl/gl_shader_manager.cpp | 9 +----
.../renderer_opengl/gl_shader_manager.h | 7 ++--
4 files changed, 48 insertions(+), 14 deletions(-)
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index 71b862114..2a2268c20 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -306,6 +306,8 @@ void RasterizerOpenGL::DrawArrays() {
// Sync and bind the texture surfaces
BindTextures();
+ // Configure the constant buffer objects
+ SetupConstBuffers();
// Viewport can have negative offsets or larger dimensions than our framebuffer sub-rect. Enable
// scissor test to prevent drawing outside of the framebuffer region
@@ -388,7 +390,7 @@ void RasterizerOpenGL::DrawArrays() {
void RasterizerOpenGL::BindTextures() {
using Regs = Tegra::Engines::Maxwell3D::Regs;
- auto maxwell3d = Core::System::GetInstance().GPU().Get3DEngine();
+ auto& maxwell3d = Core::System::GetInstance().GPU().Get3DEngine();
// Each Maxwell shader stage can have an arbitrary number of textures, but we're limited to a
// certain number in OpenGL. We try to only use the minimum amount of host textures by not
@@ -535,6 +537,41 @@ void RasterizerOpenGL::SamplerInfo::SyncWithConfig(const Tegra::Texture::TSCEntr
}
}
+void RasterizerOpenGL::SetupConstBuffers() {
+ using Regs = Tegra::Engines::Maxwell3D::Regs;
+ auto& gpu = Core::System::GetInstance().GPU();
+ auto& maxwell3d = gpu.Get3DEngine();
+
+ // Upload only the enabled buffers from the 16 constbuffers of each shader stage
+ u32 current_bindpoint = 0;
+ for (u32 stage = 0; stage < Regs::MaxShaderStage; ++stage) {
+ auto& shader_stage = maxwell3d.state.shader_stages[stage];
+ bool stage_enabled = maxwell3d.IsShaderStageEnabled(static_cast<Regs::ShaderStage>(stage));
+
+ for (u32 buffer_id = 0; buffer_id < Regs::MaxConstBuffers; ++buffer_id) {
+ const auto& buffer = shader_stage.const_buffers[buffer_id];
+
+ state.draw.const_buffers[stage][buffer_id].enabled = buffer.enabled && stage_enabled;
+
+ if (buffer.enabled && stage_enabled) {
+ state.draw.const_buffers[stage][buffer_id].bindpoint = current_bindpoint;
+ current_bindpoint++;
+
+ VAddr addr = gpu.memory_manager->PhysicalToVirtualAddress(buffer.address);
+ const u8* data = Memory::GetPointer(addr);
+ glBindBuffer(GL_SHADER_STORAGE_BUFFER,
+ state.draw.const_buffers[stage][buffer_id].ssbo);
+ glBufferData(GL_SHADER_STORAGE_BUFFER, buffer.size, data, GL_DYNAMIC_DRAW);
+ glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+ } else {
+ state.draw.const_buffers[stage][buffer_id].bindpoint = -1;
+ }
+ }
+ }
+
+ state.Apply();
+}
+
void RasterizerOpenGL::BindFramebufferSurfaces(const Surface& color_surface,
const Surface& depth_surface, bool has_stencil) {
state.draw.draw_framebuffer = framebuffer.handle;
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.h b/src/video_core/renderer_opengl/gl_rasterizer.h
index 527866e8a..bf3308aef 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer.h
@@ -87,6 +87,9 @@ private:
/// Binds the required textures to OpenGL before drawing a batch.
void BindTextures();
+ /// Configures the current constbuffers to use for the draw command.
+ void SetupConstBuffers();
+
/// Syncs the viewport to match the guest state
void SyncViewport(const MathUtil::Rectangle<u32>& surfaces_rect, u16 res_scale);
@@ -129,7 +132,9 @@ private:
std::array<bool, 16> hw_vao_enabled_attributes;
std::array<SamplerInfo, GLShader::NumTextureSamplers> texture_samplers;
- std::array<std::array<OGLBuffer, 16>, 5> ssbos;
+ std::array<std::array<OGLBuffer, Tegra::Engines::Maxwell3D::Regs::MaxConstBuffers>,
+ Tegra::Engines::Maxwell3D::Regs::MaxShaderStage>
+ ssbos;
static constexpr size_t VERTEX_BUFFER_SIZE = 128 * 1024 * 1024;
std::unique_ptr<OGLStreamBuffer> vertex_buffer;
diff --git a/src/video_core/renderer_opengl/gl_shader_manager.cpp b/src/video_core/renderer_opengl/gl_shader_manager.cpp
index 7fceedce8..85b838faa 100644
--- a/src/video_core/renderer_opengl/gl_shader_manager.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_manager.cpp
@@ -53,13 +53,6 @@ void SetShaderSamplerBindings(GLuint shader) {
} // namespace Impl
-void MaxwellUniformData::SetFromRegs(const Maxwell3D::State::ShaderStageInfo& shader_stage) {
- const auto& memory_manager = Core::System().GetInstance().GPU().memory_manager;
- for (unsigned index = 0; index < shader_stage.const_buffers.size(); ++index) {
- const auto& const_buffer = shader_stage.const_buffers[index];
- const VAddr vaddr = memory_manager->PhysicalToVirtualAddress(const_buffer.address);
- Memory::ReadBlock(vaddr, const_buffers[index].data(), sizeof(ConstBuffer));
- }
-}
+void MaxwellUniformData::SetFromRegs(const Maxwell3D::State::ShaderStageInfo& shader_stage) {}
} // namespace GLShader
diff --git a/src/video_core/renderer_opengl/gl_shader_manager.h b/src/video_core/renderer_opengl/gl_shader_manager.h
index 5c8560cf5..f003ce532 100644
--- a/src/video_core/renderer_opengl/gl_shader_manager.h
+++ b/src/video_core/renderer_opengl/gl_shader_manager.h
@@ -30,11 +30,10 @@ void SetShaderSamplerBindings(GLuint shader);
// Not following that rule will cause problems on some AMD drivers.
struct MaxwellUniformData {
void SetFromRegs(const Maxwell3D::State::ShaderStageInfo& shader_stage);
-
- using ConstBuffer = std::array<GLvec4, 4>;
- alignas(16) std::array<ConstBuffer, Maxwell3D::Regs::MaxConstBuffers> const_buffers;
+ // TODO(Subv): Use this for something.
};
-static_assert(sizeof(MaxwellUniformData) == 1024, "MaxwellUniformData structure size is incorrect");
+// static_assert(sizeof(MaxwellUniformData) == 1024, "MaxwellUniformData structure size is
+// incorrect");
static_assert(sizeof(MaxwellUniformData) < 16384,
"MaxwellUniformData structure must be less than 16kb as per the OpenGL spec");