1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/gl/DecomposeIntoNoRepeatTriangles.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,85 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* vim: set ts=8 sts=4 et sw=4 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef DecomposeIntoNoRepeatTriangles_h_
1.11 +#define DecomposeIntoNoRepeatTriangles_h_
1.12 +
1.13 +#include "GLTypes.h"
1.14 +#include "nsRect.h"
1.15 +#include "nsTArray.h"
1.16 +#include "gfx3DMatrix.h"
1.17 +
1.18 +namespace mozilla {
1.19 +namespace gl {
1.20 +
1.21 +/** Helper for DecomposeIntoNoRepeatTriangles
1.22 + */
1.23 +class RectTriangles {
1.24 +public:
1.25 + typedef struct { GLfloat x,y; } coord;
1.26 +
1.27 + // Always pass texture coordinates upright. If you want to flip the
1.28 + // texture coordinates emitted to the tex_coords array, set flip_y to
1.29 + // true.
1.30 + void addRect(GLfloat x0, GLfloat y0, GLfloat x1, GLfloat y1,
1.31 + GLfloat tx0, GLfloat ty0, GLfloat tx1, GLfloat ty1,
1.32 + bool flip_y = false);
1.33 +
1.34 + // Returns whether this object is made of only one rect that can be drawn
1.35 + // with a pre-buffered unity quad which has 0,0,1,1 as both vertex
1.36 + // positions and texture coordinates.
1.37 + // aOutTextureTransform returns the transform that maps 0,0,1,1 texture
1.38 + // coordinates to the correct ones.
1.39 + bool isSimpleQuad(gfx3DMatrix& aOutTextureTransform) const;
1.40 +
1.41 + /**
1.42 + * these return a float pointer to the start of each array respectively.
1.43 + * Use it for glVertexAttribPointer calls.
1.44 + * We can return nullptr if we choose to use Vertex Buffer Objects here.
1.45 + */
1.46 + InfallibleTArray<coord>& vertCoords() {
1.47 + return mVertexCoords;
1.48 + }
1.49 +
1.50 + InfallibleTArray<coord>& texCoords() {
1.51 + return mTexCoords;
1.52 + }
1.53 +
1.54 + unsigned int elements() {
1.55 + return mVertexCoords.Length();
1.56 + }
1.57 +private:
1.58 + // Reserve inline storage for one quad (2 triangles, 3 coords).
1.59 + nsAutoTArray<coord, 6> mVertexCoords;
1.60 + nsAutoTArray<coord, 6> mTexCoords;
1.61 +
1.62 + static void
1.63 + AppendRectToCoordArray(InfallibleTArray<coord>& array, GLfloat x0, GLfloat y0, GLfloat x1, GLfloat y1);
1.64 +};
1.65 +
1.66 +/**
1.67 + * Decompose drawing the possibly-wrapped aTexCoordRect rectangle
1.68 + * of a texture of aTexSize into one or more rectangles (represented
1.69 + * as 2 triangles) and associated tex coordinates, such that
1.70 + * we don't have to use the REPEAT wrap mode. If aFlipY is true, the
1.71 + * texture coordinates will be specified vertically flipped.
1.72 + *
1.73 + * The resulting triangle vertex coordinates will be in the space of
1.74 + * (0.0, 0.0) to (1.0, 1.0) -- transform the coordinates appropriately
1.75 + * if you need a different space.
1.76 + *
1.77 + * The resulting vertex coordinates should be drawn using GL_TRIANGLES,
1.78 + * and rects.numRects * 3 * 6
1.79 + */
1.80 +void DecomposeIntoNoRepeatTriangles(const nsIntRect& aTexCoordRect,
1.81 + const nsIntSize& aTexSize,
1.82 + RectTriangles& aRects,
1.83 + bool aFlipY = false);
1.84 +
1.85 +}
1.86 +}
1.87 +
1.88 +#endif // DecomposeIntoNoRepeatTriangles_h_
