Marius Renn | 65953da | 2012-03-27 10:44:45 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #ifndef ANDROID_FILTERFW_CORE_VERTEXFRAME_H |
| 18 | #define ANDROID_FILTERFW_CORE_VERTEXFRAME_H |
| 19 | |
| 20 | #include <GLES2/gl2.h> |
| 21 | |
| 22 | namespace android { |
| 23 | namespace filterfw { |
| 24 | |
| 25 | // A VertexFrame stores vertex attribute data in a VBO. Unlike other frames, |
| 26 | // you often create instances of VertexFrame yourself, to pass vertex data to |
| 27 | // a ShaderProgram. Note, that any kind of reading from VertexFrames is NOT |
| 28 | // supported. Once data is uploaded to a VertexFrame, it cannot be read from |
| 29 | // again. |
| 30 | class VertexFrame { |
| 31 | public: |
| 32 | // Create a VertexFrame of the specified size (in bytes). |
| 33 | explicit VertexFrame(int size); |
| 34 | |
| 35 | ~VertexFrame(); |
| 36 | |
| 37 | // Upload the given data to the vertex buffer. The size must match the size |
| 38 | // passed in the constructor for the first upload. Subsequent uploads must |
| 39 | // be able to fit within the allocated space (i.e. size must not exceed the |
| 40 | // frame's size). |
| 41 | bool WriteData(const uint8_t* data, int size); |
| 42 | |
| 43 | // The size of the vertex buffer in bytes. |
| 44 | int Size() const; |
| 45 | |
| 46 | // Return the id of the internal VBO. Returns 0 if no VBO has been |
| 47 | // generated yet. The internal VBO is generated the first time data is |
| 48 | // uploaded. |
| 49 | GLuint GetVboId() const { |
| 50 | return vbo_; |
| 51 | } |
| 52 | |
| 53 | // Returns true if the frame contains an allocated VBO. |
| 54 | bool HasBuffer() const { |
| 55 | return vbo_ != 0; |
| 56 | } |
| 57 | |
| 58 | private: |
| 59 | // Create the VBO |
| 60 | bool CreateBuffer(); |
| 61 | |
| 62 | // Returns true if the VBO has been created. |
| 63 | bool HasVBO() const { |
| 64 | return vbo_ != 0; |
| 65 | } |
| 66 | |
| 67 | // The internal VBO handle |
| 68 | GLuint vbo_; |
| 69 | |
| 70 | // The size of this frame in bytes |
| 71 | int size_; |
| 72 | }; |
| 73 | |
| 74 | } // namespace filterfw |
| 75 | } // namespace android |
| 76 | |
| 77 | #endif // ANDROID_FILTERFW_CORE_VERTEXFRAME_H |