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