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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "core/core.h"
#include "core/memory.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/renderer_opengl/gl_shader_cache.h"
#include "video_core/renderer_opengl/gl_shader_manager.h"
namespace OpenGL {
/// Gets the address for the specified shader stage program
static VAddr GetShaderAddress(Maxwell::ShaderProgram program) {
const auto& gpu = Core::System::GetInstance().GPU().Maxwell3D();
const auto& shader_config = gpu.regs.shader_config[static_cast<std::size_t>(program)];
return *gpu.memory_manager.GpuToCpuAddress(gpu.regs.code_address.CodeAddress() +
shader_config.offset);
}
/// Gets the shader program code from memory for the specified address
static GLShader::ProgramCode GetShaderCode(VAddr addr) {
GLShader::ProgramCode program_code(GLShader::MAX_PROGRAM_CODE_LENGTH);
Memory::ReadBlock(addr, program_code.data(), program_code.size() * sizeof(u64));
return program_code;
}
/// Helper function to set shader uniform block bindings for a single shader stage
static void SetShaderUniformBlockBinding(GLuint shader, const char* name,
Maxwell::ShaderStage binding, std::size_t expected_size) {
const GLuint ub_index = glGetUniformBlockIndex(shader, name);
if (ub_index == GL_INVALID_INDEX) {
return;
}
GLint ub_size = 0;
glGetActiveUniformBlockiv(shader, ub_index, GL_UNIFORM_BLOCK_DATA_SIZE, &ub_size);
ASSERT_MSG(static_cast<std::size_t>(ub_size) == expected_size,
"Uniform block size did not match! Got {}, expected {}", ub_size, expected_size);
glUniformBlockBinding(shader, ub_index, static_cast<GLuint>(binding));
}
/// Sets shader uniform block bindings for an entire shader program
static void SetShaderUniformBlockBindings(GLuint shader) {
SetShaderUniformBlockBinding(shader, "vs_config", Maxwell::ShaderStage::Vertex,
sizeof(GLShader::MaxwellUniformData));
SetShaderUniformBlockBinding(shader, "gs_config", Maxwell::ShaderStage::Geometry,
sizeof(GLShader::MaxwellUniformData));
SetShaderUniformBlockBinding(shader, "fs_config", Maxwell::ShaderStage::Fragment,
sizeof(GLShader::MaxwellUniformData));
}
CachedShader::CachedShader(VAddr addr, Maxwell::ShaderProgram program_type)
: addr{addr}, program_type{program_type}, setup{GetShaderCode(addr)} {
GLShader::ProgramResult program_result;
GLenum gl_type{};
switch (program_type) {
case Maxwell::ShaderProgram::VertexA:
// VertexB is always enabled, so when VertexA is enabled, we have two vertex shaders.
// Conventional HW does not support this, so we combine VertexA and VertexB into one
// stage here.
setup.SetProgramB(GetShaderCode(GetShaderAddress(Maxwell::ShaderProgram::VertexB)));
case Maxwell::ShaderProgram::VertexB:
program_result = GLShader::GenerateVertexShader(setup);
gl_type = GL_VERTEX_SHADER;
break;
case Maxwell::ShaderProgram::Fragment:
program_result = GLShader::GenerateFragmentShader(setup);
gl_type = GL_FRAGMENT_SHADER;
break;
default:
LOG_CRITICAL(HW_GPU, "Unimplemented program_type={}", static_cast<u32>(program_type));
UNREACHABLE();
return;
}
entries = program_result.second;
OGLShader shader;
shader.Create(program_result.first.c_str(), gl_type);
program.Create(true, shader.handle);
SetShaderUniformBlockBindings(program.handle);
}
GLuint CachedShader::GetProgramResourceIndex(const GLShader::ConstBufferEntry& buffer) {
const auto search{resource_cache.find(buffer.GetHash())};
if (search == resource_cache.end()) {
const GLuint index{
glGetProgramResourceIndex(program.handle, GL_UNIFORM_BLOCK, buffer.GetName().c_str())};
resource_cache[buffer.GetHash()] = index;
return index;
}
return search->second;
}
GLint CachedShader::GetUniformLocation(const GLShader::SamplerEntry& sampler) {
const auto search{uniform_cache.find(sampler.GetHash())};
if (search == uniform_cache.end()) {
const GLint index{glGetUniformLocation(program.handle, sampler.GetName().c_str())};
uniform_cache[sampler.GetHash()] = index;
return index;
}
return search->second;
}
Shader ShaderCacheOpenGL::GetStageProgram(Maxwell::ShaderProgram program) {
const VAddr program_addr{GetShaderAddress(program)};
// Look up shader in the cache based on address
Shader shader{TryGet(program_addr)};
if (!shader) {
// No shader found - create a new one
shader = std::make_shared<CachedShader>(program_addr, program);
Register(shader);
}
return shader;
}
} // namespace OpenGL
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