MeshState.h revision 8d2cf943d9c7292e54726399faefdec4a01c084b
1/* 2 * Copyright (C) 2015 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#ifndef RENDERSTATE_MESHSTATE_H 17#define RENDERSTATE_MESHSTATE_H 18 19#include "Vertex.h" 20 21#include <GLES2/gl2.h> 22#include <GLES2/gl2ext.h> 23#include <memory> 24 25namespace android { 26namespace uirenderer { 27 28class Program; 29 30// Maximum number of quads that pre-allocated meshes can draw 31const uint32_t kMaxNumberOfQuads = 2048; 32 33// This array is never used directly but used as a memcpy source in the 34// OpenGLRenderer constructor 35const TextureVertex kUnitQuadVertices[] = { 36 { 0, 0, 0, 0 }, 37 { 1, 0, 1, 0 }, 38 { 0, 1, 0, 1 }, 39 { 1, 1, 1, 1 }, 40}; 41 42const GLsizei kVertexStride = sizeof(Vertex); 43const GLsizei kAlphaVertexStride = sizeof(AlphaVertex); 44const GLsizei kTextureVertexStride = sizeof(TextureVertex); 45const GLsizei kColorTextureVertexStride = sizeof(ColorTextureVertex); 46 47const GLsizei kMeshTextureOffset = 2 * sizeof(float); 48const GLsizei kVertexAlphaOffset = 2 * sizeof(float); 49const GLsizei kVertexAAWidthOffset = 2 * sizeof(float); 50const GLsizei kVertexAALengthOffset = 3 * sizeof(float); 51const GLsizei kUnitQuadCount = 4; 52 53class MeshState { 54private: 55 friend class RenderState; 56 57public: 58 ~MeshState(); 59 void dump(); 60 /////////////////////////////////////////////////////////////////////////////// 61 // Buffer objects 62 /////////////////////////////////////////////////////////////////////////////// 63 /** 64 * Binds the VBO used to render simple textured quads. 65 */ 66 bool bindMeshBuffer(); 67 68 /** 69 * Binds the specified VBO if needed. If buffer == 0, binds default simple textured quad. 70 */ 71 bool bindMeshBuffer(GLuint buffer); 72 73 /** 74 * Unbinds the VBO used to render simple textured quads. 75 */ 76 bool unbindMeshBuffer(); 77 78 void genOrUpdateMeshBuffer(GLuint* buffer, GLsizeiptr size, const void* data, GLenum usage); 79 void deleteMeshBuffer(GLuint); 80 81 /////////////////////////////////////////////////////////////////////////////// 82 // Vertices 83 /////////////////////////////////////////////////////////////////////////////// 84 /** 85 * Binds an attrib to the specified float vertex pointer. 86 * Assumes a stride of gTextureVertexStride and a size of 2. 87 */ 88 void bindPositionVertexPointer(bool force, const GLvoid* vertices, 89 GLsizei stride = kTextureVertexStride); 90 91 /** 92 * Binds an attrib to the specified float vertex pointer. 93 * Assumes a stride of gTextureVertexStride and a size of 2. 94 */ 95 void bindTexCoordsVertexPointer(bool force, const GLvoid* vertices, 96 GLsizei stride = kTextureVertexStride); 97 98 /** 99 * Resets the vertex pointers. 100 */ 101 void resetVertexPointers(); 102 void resetTexCoordsVertexPointer(); 103 104 void enableTexCoordsVertexArray(); 105 void disableTexCoordsVertexArray(); 106 107 /////////////////////////////////////////////////////////////////////////////// 108 // Indices 109 /////////////////////////////////////////////////////////////////////////////// 110 /** 111 * Binds a global indices buffer that can draw up to 112 * gMaxNumberOfQuads quads. 113 */ 114 bool bindQuadIndicesBuffer(); 115 bool unbindIndicesBuffer(); 116 117 /////////////////////////////////////////////////////////////////////////////// 118 // Getters - for use in Glop building 119 /////////////////////////////////////////////////////////////////////////////// 120 GLuint getUnitQuadVBO() { return mUnitQuadBuffer; } 121 GLuint getQuadListIBO() { return mQuadListIndices; } 122private: 123 MeshState(); 124 bool bindMeshBufferInternal(const GLuint buffer); 125 bool bindIndicesBufferInternal(const GLuint buffer); 126 127 GLuint mUnitQuadBuffer; 128 129 GLuint mCurrentBuffer; 130 GLuint mCurrentIndicesBuffer; 131 GLuint mCurrentPixelBuffer; 132 133 const void* mCurrentPositionPointer; 134 GLsizei mCurrentPositionStride; 135 const void* mCurrentTexCoordsPointer; 136 GLsizei mCurrentTexCoordsStride; 137 138 bool mTexCoordsArrayEnabled; 139 140 // Global index buffer 141 GLuint mQuadListIndices; 142}; 143 144} /* namespace uirenderer */ 145} /* namespace android */ 146 147#endif // RENDERSTATE_MESHSTATE_H 148