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/*
* Copyright 2011-2022 OpenGL Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "util/types.h"
CCL_NAMESPACE_BEGIN
class OpenGLShader {
public:
static constexpr const char *position_attribute_name = "pos";
static constexpr const char *tex_coord_attribute_name = "texCoord";
OpenGLShader() = default;
virtual ~OpenGLShader() = default;
/* Get attribute location for position and texture coordinate respectively.
* NOTE: The shader needs to be bound to have access to those. */
int get_position_attrib_location();
int get_tex_coord_attrib_location();
void bind(int width, int height);
void unbind();
protected:
uint get_shader_program();
void create_shader_if_needed();
void destroy_shader();
/* Cached values of various OpenGL resources. */
int position_attribute_location_ = -1;
int tex_coord_attribute_location_ = -1;
uint shader_program_ = 0;
int image_texture_location_ = -1;
int fullscreen_location_ = -1;
/* Shader compilation attempted. Which means, that if the shader program is 0 then compilation or
* linking has failed. Do not attempt to re-compile the shader. */
bool shader_compile_attempted_ = false;
};
CCL_NAMESPACE_END
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