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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <glad/glad.h>
#include "video_core/renderer_opengl/gl_resource_manager.h"
#include "video_core/renderer_opengl/gl_state.h"
#include "video_core/renderer_opengl/maxwell_to_gl.h"
namespace OpenGL::GLShader {
using Tegra::Engines::Maxwell3D;
/// Uniform structure for the Uniform Buffer Object, all vectors must be 16-byte aligned
// NOTE: Always keep a vec4 at the end. The GL spec is not clear whether the alignment at
// the end of a uniform block is included in UNIFORM_BLOCK_DATA_SIZE or not.
// Not following that rule will cause problems on some AMD drivers.
struct MaxwellUniformData {
void SetFromRegs(const Maxwell3D::State::ShaderStageInfo& shader_stage);
alignas(16) GLvec4 viewport_flip;
struct alignas(16) {
GLuint instance_id;
GLuint flip_stage;
GLfloat y_direction;
};
struct alignas(16) {
GLuint enabled;
GLuint func;
GLfloat ref;
GLuint padding;
} alpha_test;
};
static_assert(sizeof(MaxwellUniformData) == 48, "MaxwellUniformData structure size is incorrect");
static_assert(sizeof(MaxwellUniformData) < 16384,
"MaxwellUniformData structure must be less than 16kb as per the OpenGL spec");
class ProgramManager {
public:
ProgramManager() {
pipeline.Create();
}
void UseProgrammableVertexShader(GLuint program) {
vs = program;
}
void UseProgrammableGeometryShader(GLuint program) {
gs = program;
}
void UseProgrammableFragmentShader(GLuint program) {
fs = program;
}
void UseTrivialGeometryShader() {
gs = 0;
}
void ApplyTo(OpenGLState& state) {
// Workaround for AMD bug
glUseProgramStages(pipeline.handle,
GL_VERTEX_SHADER_BIT | GL_GEOMETRY_SHADER_BIT | GL_FRAGMENT_SHADER_BIT,
0);
glUseProgramStages(pipeline.handle, GL_VERTEX_SHADER_BIT, vs);
glUseProgramStages(pipeline.handle, GL_GEOMETRY_SHADER_BIT, gs);
glUseProgramStages(pipeline.handle, GL_FRAGMENT_SHADER_BIT, fs);
state.draw.shader_program = 0;
state.draw.program_pipeline = pipeline.handle;
state.geometry_shaders.enabled = (gs != 0);
}
private:
OGLPipeline pipeline;
GLuint vs{}, fs{}, gs{};
};
} // namespace OpenGL::GLShader
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