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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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 ANDROID_FILTERFW_CORE_VERTEXFRAME_H
#define ANDROID_FILTERFW_CORE_VERTEXFRAME_H
#include <GLES2/gl2.h>
namespace android {
namespace filterfw {
// A VertexFrame stores vertex attribute data in a VBO. Unlike other frames,
// you often create instances of VertexFrame yourself, to pass vertex data to
// a ShaderProgram. Note, that any kind of reading from VertexFrames is NOT
// supported. Once data is uploaded to a VertexFrame, it cannot be read from
// again.
class VertexFrame {
public:
// Create a VertexFrame of the specified size (in bytes).
explicit VertexFrame(int size);
~VertexFrame();
// Upload the given data to the vertex buffer. The size must match the size
// passed in the constructor for the first upload. Subsequent uploads must
// be able to fit within the allocated space (i.e. size must not exceed the
// frame's size).
bool WriteData(const uint8_t* data, int size);
// The size of the vertex buffer in bytes.
int Size() const;
// Return the id of the internal VBO. Returns 0 if no VBO has been
// generated yet. The internal VBO is generated the first time data is
// uploaded.
GLuint GetVboId() const {
return vbo_;
}
// Returns true if the frame contains an allocated VBO.
bool HasBuffer() const {
return vbo_ != 0;
}
private:
// Create the VBO
bool CreateBuffer();
// Returns true if the VBO has been created.
bool HasVBO() const {
return vbo_ != 0;
}
// The internal VBO handle
GLuint vbo_;
// The size of this frame in bytes
int size_;
};
} // namespace filterfw
} // namespace android
#endif // ANDROID_FILTERFW_CORE_VERTEXFRAME_H
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