初始化

cocos2d-x/cocos/base/CCRenderTexture.h

@@ -0,0 +1,98 @@
+/****************************************************************************
+ Copyright (c) 2018 Xiamen Yaji Software Co., Ltd.
+ 
+ http://www.cocos2d-x.org
+ 
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+ 
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+ 
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
+ ****************************************************************************/
+#pragma once
+
+#include "base/ccMacros.h"
+#include "math/Vec2.h"
+#include "platform/CCGL.h"
+#include "base/CCGLUtils.h"
+
+NS_CC_BEGIN
+
+struct VertexAttributePointerInfo;
+
+class RenderTexture
+{
+public:
+    RenderTexture(int width, int height);
+    ~RenderTexture();
+    
+    void init(int factor);
+    
+    /** Do some work before draw, such as:
+      * - bind frame buffer
+      * - set viewport
+      * This function should be invoked at the begin of rendering the frame.
+     */
+    void prepare();
+    void draw();
+    
+private:
+    bool initProgram();
+    void initTexture();
+    bool compileShader(GLuint& shader, GLenum type, const GLchar* source) const;
+    bool parseVertexAttribs();
+    bool parseUniforms();
+    void initVBOAndVAO();
+    void initVBO();
+    void initFramebuffer();
+    void recordPreviousGLStates(bool supportsVAO);
+    void resetPreviousGLStates(bool supportsVAO) const;
+    
+    GLuint _texture = 0;
+    GLint _mainFBO = -1;
+    GLuint _FBO = 0;
+    GLuint _VBO[2] = {0, 0};
+    GLuint _VAO = 0;
+    GLuint _depthBuffer = 0;
+    GLuint _stencilBuffer = 0;
+    
+    GLuint _program = 0;
+    GLint _vertAttributePositionLocation = -1;
+    GLint _vertAttributeTextureCoordLocation = -1;
+    GLint _fragUniformTextureLocation = -1;
+
+    // the size of the render texture
+    int _width = 0;
+    int _height = 0;
+    
+    // device resolution
+    Vec2 _deviceResolution;
+    
+    // record previous gl states
+    GLint _prevVBO = 0;
+    GLint _prevVIO = 0;
+    const VertexAttributePointerInfo* _prevPosLocInfo = nullptr;
+    const VertexAttributePointerInfo* _prevTexCoordLocInfo = nullptr;
+    GLboolean _prevColorWriteMask[4] = {GL_FALSE};
+    GLboolean _prevDepthTest = GL_FALSE;
+    GLboolean _prevBlendTest = GL_FALSE;
+    GLboolean _prevCullFase = GL_FALSE;
+    GLboolean _prevStencilTest = GL_FALSE;
+    GLboolean _prevScissorTest = GL_FALSE;
+    GLint _prevProgram = 0;
+    BoundTextureInfo* _preveBoundTextureInfo = nullptr;
+};
+
+NS_CC_END