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// Copyright 2017 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "VideoBackends/OGL/OGLShader.h"
#include "VideoBackends/OGL/ProgramShaderCache.h"
namespace OGL
{
static GLenum GetGLShaderTypeForStage(ShaderStage stage)
{
switch (stage)
{
case ShaderStage::Vertex:
return GL_VERTEX_SHADER;
case ShaderStage::Geometry:
return GL_GEOMETRY_SHADER;
case ShaderStage::Pixel:
return GL_FRAGMENT_SHADER;
case ShaderStage::Compute:
return GL_COMPUTE_SHADER;
default:
return 0;
}
}
OGLShader::OGLShader(ShaderStage stage, GLenum gl_type, GLuint shader_id)
: AbstractShader(stage), m_type(gl_type), m_id(shader_id)
{
}
OGLShader::OGLShader(GLuint compute_program_id)
: AbstractShader(ShaderStage::Compute), m_type(GL_COMPUTE_SHADER),
m_compute_program_id(compute_program_id)
{
}
OGLShader::~OGLShader()
{
if (m_stage != ShaderStage::Compute)
glDeleteShader(m_id);
else
glDeleteProgram(m_compute_program_id);
}
bool OGLShader::HasBinary() const
{
// NOTE: GL shaders do not have binaries, programs do.
return false;
}
AbstractShader::BinaryData OGLShader::GetBinary() const
{
return {};
}
std::unique_ptr<OGLShader> OGLShader::CreateFromSource(ShaderStage stage, const char* source,
size_t length)
{
if (stage != ShaderStage::Compute)
{
GLenum shader_type = GetGLShaderTypeForStage(stage);
GLuint shader_id =
ProgramShaderCache::CompileSingleShader(shader_type, std::string(source, length));
if (!shader_id)
return nullptr;
return std::make_unique<OGLShader>(stage, shader_type, shader_id);
}
// Compute shaders.
SHADER prog;
if (!ProgramShaderCache::CompileComputeShader(prog, std::string(source, length)))
return nullptr;
return std::make_unique<OGLShader>(prog.glprogid);
}
} // namespace OGL
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