初始化

cocos2d-x/cocos/base/CCGLUtils.h

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+/****************************************************************************
+ 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 <stdint.h>
+#include "base/ccMacros.h"
+#include "platform/CCGL.h"
+
+NS_CC_BEGIN
+
+struct BoundTextureInfo
+{
+    GLenum target = GL_TEXTURE_2D;
+    GLuint texture = 0;
+};
+
+void ccInvalidateStateCache();
+
+void ccActiveTexture(GLenum texture);
+void ccBindTexture(GLenum target, GLuint texture);
+BoundTextureInfo* getBoundTextureInfo(uint32_t textureUnit);
+void ccBindFramebuffer(GLenum target,GLuint buffer);
+void ccActiveOffScreenFramebuffer(GLuint offscreenFbo);
+void ccBindBuffer(GLenum target, GLuint buffer);
+void ccDeleteBuffers(GLsizei, const GLuint * buffers);
+GLint ccGetBoundVertexBuffer();
+GLint ccGetBoundIndexBuffer();
+void ccBindVertexArray(GLuint VAO);
+GLint ccGetBoundVertexArray();
+
+void ccViewport(GLint x, GLint y, GLsizei width, GLsizei height);
+void ccScissor(GLint x, GLint y, GLsizei width, GLsizei height);
+
+struct VertexAttributePointerInfo
+{
+    VertexAttributePointerInfo(GLuint VBO, GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid* pointer)
+    : VBO(VBO)
+    , index(index)
+    , size(size)
+    , type(type)
+    , normalized(normalized)
+    , stride(stride)
+    , pointer(pointer)
+    {}
+    
+    VertexAttributePointerInfo() {}
+    
+    GLuint index = 0;
+    // The VBO this attribute bind to.
+    GLuint VBO = 0;
+    GLint size = 0;
+    GLenum type = GL_UNSIGNED_BYTE;
+    GLboolean normalized = false;
+    GLsizei stride = 0;
+    const GLvoid* pointer = nullptr;
+};
+void ccEnableVertexAttribArray(GLuint index);
+void ccDisableVertexAttribArray(GLuint index);
+void ccVertexAttribPointer(GLuint, GLint, GLenum, GLboolean, GLsizei, const GLvoid*);
+const VertexAttributePointerInfo* getVertexAttribPointerInfo(GLuint index);
+
+//  Converts pixel if unpackFlipY or premultiplyAlpha is true.
+void ccFlipYOrPremultiptyAlphaIfNeeded(GLenum format, GLsizei width, GLsizei height, uint32_t pixelBytes, GLvoid* pixels);
+
+bool ccIsUnpackFlipY();
+bool ccIsPremultiplyAlpha();
+void ccPixelStorei(GLenum pname, GLint param);
+GLint ccGetBufferDataSize();
+
+NS_CC_END