Vertex.h revision 2765c0b71679b5762ed72610e8310abd6d071b96 
1/*
2 * Copyright (C) 2010 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
17#ifndef ANDROID_HWUI_VERTEX_H
18#define ANDROID_HWUI_VERTEX_H
19
20#include "Vector.h"
21
22namespace android {
23namespace uirenderer {
24
25/**
26 * Simple structure to describe a vertex with a position and a texture.
27 */
28struct Vertex {
29    /**
30     * Fudge-factor used to disambiguate geometry pixel positioning.
31     *
32     * Used to offset lines and points to avoid ambiguous intersection with pixel centers (see
33     * Program::set()), and used to make geometry damage rect calculation conservative (see
34     * Rect::snapGeometryToPixelBoundaries())
35     */
36    static const float gGeometryFudgeFactor = 0.0656f;
37
38    float x, y;
39
40    static inline void set(Vertex* vertex, float x, float y) {
41        vertex[0].x = x;
42        vertex[0].y = y;
43    }
44
45    static inline void set(Vertex* vertex, vec2 val) {
46        set(vertex, val.x, val.y);
47    }
48
49    static inline void copyWithOffset(Vertex* vertex, const Vertex& src, float x, float y) {
50        set(vertex, src.x + x, src.y + y);
51    }
52
53}; // struct Vertex
54
55/**
56 * Simple structure to describe a vertex with a position and texture UV.
57 */
58struct TextureVertex {
59    float x, y;
60    float u, v;
61
62    static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
63        vertex[0].x = x;
64        vertex[0].y = y;
65        vertex[0].u = u;
66        vertex[0].v = v;
67    }
68
69    static inline void setUV(TextureVertex* vertex, float u, float v) {
70        vertex[0].u = u;
71        vertex[0].v = v;
72    }
73}; // struct TextureVertex
74
75/**
76 * Simple structure to describe a vertex with a position, texture UV and ARGB color.
77 */
78struct ColorTextureVertex : TextureVertex {
79    float r, g, b, a;
80
81    static inline void set(ColorTextureVertex* vertex, float x, float y,
82            float u, float v, int color) {
83        TextureVertex::set(vertex, x, y, u, v);
84
85        const float a = ((color >> 24) & 0xff) / 255.0f;
86        vertex[0].r = a * ((color >> 16) & 0xff) / 255.0f;
87        vertex[0].g = a * ((color >>  8) & 0xff) / 255.0f;
88        vertex[0].b = a * ((color      ) & 0xff) / 255.0f;
89        vertex[0].a = a;
90    }
91}; // struct ColorTextureVertex
92
93/**
94 * Simple structure to describe a vertex with a position and an alpha value.
95 */
96struct AlphaVertex : Vertex {
97    float alpha;
98
99    static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
100        Vertex::set(vertex, x, y);
101        vertex[0].alpha = alpha;
102    }
103
104    static inline void copyWithOffset(AlphaVertex* vertex, const AlphaVertex& src,
105            float x, float y) {
106        Vertex::set(vertex, src.x + x, src.y + y);
107        vertex[0].alpha = src.alpha;
108    }
109
110    static inline void setColor(AlphaVertex* vertex, float alpha) {
111        vertex[0].alpha = alpha;
112    }
113}; // struct AlphaVertex
114
115}; // namespace uirenderer
116}; // namespace android
117
118#endif // ANDROID_HWUI_VERTEX_H
119