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comparison: gfx/gl/DecomposeIntoNoRepeatTriangles.h
gfx/gl/DecomposeIntoNoRepeatTriangles.h
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* vim: set ts=8 sts=4 et sw=4 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef DecomposeIntoNoRepeatTriangles_h_ | |
| 8 #define DecomposeIntoNoRepeatTriangles_h_ | |
| 9 | |
| 10 #include "GLTypes.h" | |
| 11 #include "nsRect.h" | |
| 12 #include "nsTArray.h" | |
| 13 #include "gfx3DMatrix.h" | |
| 14 | |
| 15 namespace mozilla { | |
| 16 namespace gl { | |
| 17 | |
| 18 /** Helper for DecomposeIntoNoRepeatTriangles | |
| 19 */ | |
| 20 class RectTriangles { | |
| 21 public: | |
| 22 typedef struct { GLfloat x,y; } coord; | |
| 23 | |
| 24 // Always pass texture coordinates upright. If you want to flip the | |
| 25 // texture coordinates emitted to the tex_coords array, set flip_y to | |
| 26 // true. | |
| 27 void addRect(GLfloat x0, GLfloat y0, GLfloat x1, GLfloat y1, | |
| 28 GLfloat tx0, GLfloat ty0, GLfloat tx1, GLfloat ty1, | |
| 29 bool flip_y = false); | |
| 30 | |
| 31 // Returns whether this object is made of only one rect that can be drawn | |
| 32 // with a pre-buffered unity quad which has 0,0,1,1 as both vertex | |
| 33 // positions and texture coordinates. | |
| 34 // aOutTextureTransform returns the transform that maps 0,0,1,1 texture | |
| 35 // coordinates to the correct ones. | |
| 36 bool isSimpleQuad(gfx3DMatrix& aOutTextureTransform) const; | |
| 37 | |
| 38 /** | |
| 39 * these return a float pointer to the start of each array respectively. | |
| 40 * Use it for glVertexAttribPointer calls. | |
| 41 * We can return nullptr if we choose to use Vertex Buffer Objects here. | |
| 42 */ | |
| 43 InfallibleTArray<coord>& vertCoords() { | |
| 44 return mVertexCoords; | |
| 45 } | |
| 46 | |
| 47 InfallibleTArray<coord>& texCoords() { | |
| 48 return mTexCoords; | |
| 49 } | |
| 50 | |
| 51 unsigned int elements() { | |
| 52 return mVertexCoords.Length(); | |
| 53 } | |
| 54 private: | |
| 55 // Reserve inline storage for one quad (2 triangles, 3 coords). | |
| 56 nsAutoTArray<coord, 6> mVertexCoords; | |
| 57 nsAutoTArray<coord, 6> mTexCoords; | |
| 58 | |
| 59 static void | |
| 60 AppendRectToCoordArray(InfallibleTArray<coord>& array, GLfloat x0, GLfloat y0, GLfloat x1, GLfloat y1); | |
| 61 }; | |
| 62 | |
| 63 /** | |
| 64 * Decompose drawing the possibly-wrapped aTexCoordRect rectangle | |
| 65 * of a texture of aTexSize into one or more rectangles (represented | |
| 66 * as 2 triangles) and associated tex coordinates, such that | |
| 67 * we don't have to use the REPEAT wrap mode. If aFlipY is true, the | |
| 68 * texture coordinates will be specified vertically flipped. | |
| 69 * | |
| 70 * The resulting triangle vertex coordinates will be in the space of | |
| 71 * (0.0, 0.0) to (1.0, 1.0) -- transform the coordinates appropriately | |
| 72 * if you need a different space. | |
| 73 * | |
| 74 * The resulting vertex coordinates should be drawn using GL_TRIANGLES, | |
| 75 * and rects.numRects * 3 * 6 | |
| 76 */ | |
| 77 void DecomposeIntoNoRepeatTriangles(const nsIntRect& aTexCoordRect, | |
| 78 const nsIntSize& aTexSize, | |
| 79 RectTriangles& aRects, | |
| 80 bool aFlipY = false); | |
| 81 | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 #endif // DecomposeIntoNoRepeatTriangles_h_ |
