ShaderBase.h

/*
 * Copyright (C) 2014 Google Inc.
 *
 * 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.
 */

#ifndef SHADERBASE_H
#define SHADERBASE_H

#include "AttributeSet.h"
#include "RendererCommon.h"
#include "Shader.h"
#include <assert.h>
#include <string>
#include <vector>

class ShaderBase : public Shader {
public:
    ShaderBase(const std::string& vertexShaderCode, const std::string& fragmentShaderCode,
            const AttributeSetPtr& attributes, const std::vector<std::string>& uniformNames);
    virtual ~ShaderBase();

    virtual bool isCurrent() const override;
    virtual bool isValid() const override;
    virtual bool isCompiled() const override;
    virtual GLuint getProgramId() const override;

    virtual void begin() override;
    virtual void end() override;
    virtual void compile() override;
    virtual std::string getErrorLog() const override;
    void dispose();

    virtual int getAttributeLocation(int index) const override;
    virtual int getUniformLocation(int index) const override;

protected:
    virtual void performCompile();

private:
    void checkCompile();
    void compileCode();
    void bindLocations();

    bool mCurrentShader = false;
    bool mValid = false;
    bool mCompiled = false;
    bool mProgramCreated = false;
    GLuint mProgramId = 0;
    bool mVertexShaderCreated = false;
    GLuint mVertexShaderId = 0;
    bool mFragmentShaderCreated = false;
    GLuint mFragmentShaderId = 0;
    std::string mVertexShaderCode;
    std::string mFragmentShaderCode;
    std::vector<int> mAttributeLocations;
    std::vector<int> mUniformLocations;
};

#endif // SHADERBASE_H