gfx/gl/DecomposeIntoNoRepeatTriangles.h@6474c204b198 (annotated)
gfx/gl/DecomposeIntoNoRepeatTriangles.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ |
| michael@0 | 2 | /* vim: set ts=8 sts=4 et sw=4 tw=80: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #ifndef DecomposeIntoNoRepeatTriangles_h_ |
| michael@0 | 8 | #define DecomposeIntoNoRepeatTriangles_h_ |
| michael@0 | 9 | |
| michael@0 | 10 | #include "GLTypes.h" |
| michael@0 | 11 | #include "nsRect.h" |
| michael@0 | 12 | #include "nsTArray.h" |
| michael@0 | 13 | #include "gfx3DMatrix.h" |
| michael@0 | 14 | |
| michael@0 | 15 | namespace mozilla { |
| michael@0 | 16 | namespace gl { |
| michael@0 | 17 | |
| michael@0 | 18 | /** Helper for DecomposeIntoNoRepeatTriangles |
| michael@0 | 19 | */ |
| michael@0 | 20 | class RectTriangles { |
| michael@0 | 21 | public: |
| michael@0 | 22 | typedef struct { GLfloat x,y; } coord; |
| michael@0 | 23 | |
| michael@0 | 24 | // Always pass texture coordinates upright. If you want to flip the |
| michael@0 | 25 | // texture coordinates emitted to the tex_coords array, set flip_y to |
| michael@0 | 26 | // true. |
| michael@0 | 27 | void addRect(GLfloat x0, GLfloat y0, GLfloat x1, GLfloat y1, |
| michael@0 | 28 | GLfloat tx0, GLfloat ty0, GLfloat tx1, GLfloat ty1, |
| michael@0 | 29 | bool flip_y = false); |
| michael@0 | 30 | |
| michael@0 | 31 | // Returns whether this object is made of only one rect that can be drawn |
| michael@0 | 32 | // with a pre-buffered unity quad which has 0,0,1,1 as both vertex |
| michael@0 | 33 | // positions and texture coordinates. |
| michael@0 | 34 | // aOutTextureTransform returns the transform that maps 0,0,1,1 texture |
| michael@0 | 35 | // coordinates to the correct ones. |
| michael@0 | 36 | bool isSimpleQuad(gfx3DMatrix& aOutTextureTransform) const; |
| michael@0 | 37 | |
| michael@0 | 38 | /** |
| michael@0 | 39 | * these return a float pointer to the start of each array respectively. |
| michael@0 | 40 | * Use it for glVertexAttribPointer calls. |
| michael@0 | 41 | * We can return nullptr if we choose to use Vertex Buffer Objects here. |
| michael@0 | 42 | */ |
| michael@0 | 43 | InfallibleTArray<coord>& vertCoords() { |
| michael@0 | 44 | return mVertexCoords; |
| michael@0 | 45 | } |
| michael@0 | 46 | |
| michael@0 | 47 | InfallibleTArray<coord>& texCoords() { |
| michael@0 | 48 | return mTexCoords; |
| michael@0 | 49 | } |
| michael@0 | 50 | |
| michael@0 | 51 | unsigned int elements() { |
| michael@0 | 52 | return mVertexCoords.Length(); |
| michael@0 | 53 | } |
| michael@0 | 54 | private: |
| michael@0 | 55 | // Reserve inline storage for one quad (2 triangles, 3 coords). |
| michael@0 | 56 | nsAutoTArray<coord, 6> mVertexCoords; |
| michael@0 | 57 | nsAutoTArray<coord, 6> mTexCoords; |
| michael@0 | 58 | |
| michael@0 | 59 | static void |
| michael@0 | 60 | AppendRectToCoordArray(InfallibleTArray<coord>& array, GLfloat x0, GLfloat y0, GLfloat x1, GLfloat y1); |
| michael@0 | 61 | }; |
| michael@0 | 62 | |
| michael@0 | 63 | /** |
| michael@0 | 64 | * Decompose drawing the possibly-wrapped aTexCoordRect rectangle |
| michael@0 | 65 | * of a texture of aTexSize into one or more rectangles (represented |
| michael@0 | 66 | * as 2 triangles) and associated tex coordinates, such that |
| michael@0 | 67 | * we don't have to use the REPEAT wrap mode. If aFlipY is true, the |
| michael@0 | 68 | * texture coordinates will be specified vertically flipped. |
| michael@0 | 69 | * |
| michael@0 | 70 | * The resulting triangle vertex coordinates will be in the space of |
| michael@0 | 71 | * (0.0, 0.0) to (1.0, 1.0) -- transform the coordinates appropriately |
| michael@0 | 72 | * if you need a different space. |
| michael@0 | 73 | * |
| michael@0 | 74 | * The resulting vertex coordinates should be drawn using GL_TRIANGLES, |
| michael@0 | 75 | * and rects.numRects * 3 * 6 |
| michael@0 | 76 | */ |
| michael@0 | 77 | void DecomposeIntoNoRepeatTriangles(const nsIntRect& aTexCoordRect, |
| michael@0 | 78 | const nsIntSize& aTexSize, |
| michael@0 | 79 | RectTriangles& aRects, |
| michael@0 | 80 | bool aFlipY = false); |
| michael@0 | 81 | |
| michael@0 | 82 | } |
| michael@0 | 83 | } |
| michael@0 | 84 | |
| michael@0 | 85 | #endif // DecomposeIntoNoRepeatTriangles_h_ |
