Shader.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 SHADER_H
#define SHADER_H

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

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

    virtual bool isCurrent() const = 0;
    virtual bool isValid() const = 0;
    virtual bool isCompiled() const = 0;
    virtual GLuint getProgramId() const = 0;

    virtual void begin() = 0;
    virtual void end() = 0;
    virtual void compile() = 0;
    virtual std::string getErrorLog() const = 0;

    const AttributeSetPtr& getAttributes() const { return mAttributes; }
    const std::vector<std::string>& getUniformNames() const { return mUniformNames; }
    virtual int getAttributeLocation(int index) const = 0;
    virtual int getUniformLocation(int index) const = 0;

    // TODO: This list of methods needs to be expanded.
    void setIndexedUniform1f(int index, bool global, float value, float* stateValue);
    void setIndexedUniform2f(int index, bool global, const Vector2& value, Vector2* stateValue);
    void setIndexedUniform3f(int index, bool global, float value1, float value2, float value3,
            float* stateValue);
    void setIndexedUniform4f(int index, bool global, float value1, float value2, float value3,
            float value4, float* stateValue);
    void setIndexedUniform1i(int index, bool global, int value, int* stateValue);
    void setIndexedUniformMatrix4f(int index, bool global, bool transpose, const Matrix4& value,
            Matrix4* stateValue);

private:
    AttributeSetPtr mAttributes;
    std::vector<std::string> mUniformNames;
};

#endif // SHADER_H