| // Copyright (C) 2015 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 TEXTURE_DRAW_H |
| #define TEXTURE_DRAW_H |
| |
| #include <EGL/egl.h> |
| #include <GLES2/gl2.h> |
| |
| // Helper class used to draw a simple texture to the current framebuffer. |
| // Usage is pretty simple: |
| // |
| // 1) Create a TextureDraw instance. |
| // |
| // 2) Each time you want to draw a texture, call draw(texture, rotation), |
| // where |texture| is the name of a GLES 2.x texture object, and |
| // |rotation| is an angle in degrees describing the clockwise rotation |
| // in the GL y-upwards coordinate space. This function fills the whole |
| // framebuffer with texture content. |
| // |
| class TextureDraw { |
| public: |
| TextureDraw(); |
| ~TextureDraw(); |
| |
| // Fill the current framebuffer with the content of |texture|, which must |
| // be the name of a GLES 2.x texture object. |rotationDegrees| is a |
| // clockwise rotation angle in degrees (clockwise in the GL Y-upwards |
| // coordinate space; only supported values are 0, 90, 180, 270). |dx,dy| is |
| // the translation of the image towards the origin. |
| bool draw(GLuint texture, float rotationDegrees, float dx, float dy); |
| |
| private: |
| GLuint mVertexShader; |
| GLuint mFragmentShader; |
| GLuint mProgram; |
| GLint mPositionSlot; |
| GLint mInCoordSlot; |
| GLint mTextureSlot; |
| GLint mTranslationSlot; |
| GLuint mVertexBuffer; |
| GLuint mIndexBuffer; |
| }; |
| |
| #endif // TEXTURE_DRAW_H |