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#include "../../../include/RenderBackend/OpenGL/Shader.hpp"
#include "../../../include/RenderBackend/OpenGL/opengl.hpp"
namespace amalgine {
static GLuint to_opengl_shader_type(Shader::Type type) {
switch(type) {
case Shader::Type::VERTEX:
return GL_VERTEX_SHADER;
case Shader::Type::PIXEL:
return GL_FRAGMENT_SHADER;
}
assert(false);
return 0;
}
static std::string get_shader_compile_log(GLuint shaderId)
{
std::string result;
GLint shaderLogLength;
glGetShaderiv(shaderId, GL_INFO_LOG_LENGTH, &shaderLogLength);
if(shaderLogLength > 0) {
result.resize(shaderLogLength);
glGetShaderInfoLog(shaderId, shaderLogLength, NULL, &result[0]);
}
return result;
}
Shader::Shader(u32 shader_id) : id(shader_id) {
}
Shader::~Shader() {
glDeleteShader(id);
}
// static
Result<std::unique_ptr<Shader>> Shader::compile(Type type, const char *str, int size) {
GLuint shader_id = glCreateShader(to_opengl_shader_type(type));
GLint shader_lengths[1] = { size };
glShaderSource(shader_id, 1, &str, shader_lengths);
glCompileShader(shader_id);
GLint status;
glGetShaderiv(shader_id, GL_COMPILE_STATUS, &status);
std::string compileLog = get_shader_compile_log(shader_id);
if(status == GL_TRUE) {
if(!compileLog.empty())
fprintf(stderr, "Shader compile log:\n%s", compileLog.c_str());
std::unique_ptr<Shader> shader;
shader.reset(new Shader(shader_id));
return Result<std::unique_ptr<Shader>>::Ok(std::move(shader));
}
else
return Result<std::unique_ptr<Shader>>::Err(compileLog);
}
}
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