Vertex.h revision ff316ec7a76e52572a2e89b691e6b3bba0cafba3
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
20namespace android {
21namespace uirenderer {
22
23/**
24 * Simple structure to describe a vertex with a position and a texture.
25 */
26struct Vertex {
27    float position[2];
28
29    static inline void set(Vertex* vertex, float x, float y) {
30        vertex[0].position[0] = x;
31        vertex[0].position[1] = y;
32    }
33}; // struct Vertex
34
35/**
36 * Simple structure to describe a vertex with a position and texture UV.
37 */
38struct TextureVertex {
39    float position[2];
40    float texture[2];
41
42    static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
43        vertex[0].position[0] = x;
44        vertex[0].position[1] = y;
45        vertex[0].texture[0] = u;
46        vertex[0].texture[1] = v;
47    }
48
49    static inline void setUV(TextureVertex* vertex, float u, float v) {
50        vertex[0].texture[0] = u;
51        vertex[0].texture[1] = v;
52    }
53}; // struct TextureVertex
54
55/**
56 * Simple structure to describe a vertex with a position, texture UV and ARGB color.
57 */
58struct ColorTextureVertex : TextureVertex {
59    float color[4];
60
61    static inline void set(ColorTextureVertex* vertex, float x, float y,
62            float u, float v, int color) {
63        TextureVertex::set(vertex, x, y, u, v);
64
65        const float a = ((color >> 24) & 0xff) / 255.0f;
66        vertex[0].color[0] = a * ((color >> 16) & 0xff) / 255.0f;
67        vertex[0].color[1] = a * ((color >>  8) & 0xff) / 255.0f;
68        vertex[0].color[2] = a * ((color      ) & 0xff) / 255.0f;
69        vertex[0].color[3] = a;
70    }
71}; // struct ColorTextureVertex
72
73/**
74 * Simple structure to describe a vertex with a position and an alpha value.
75 */
76struct AlphaVertex : Vertex {
77    float alpha;
78
79    static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
80        Vertex::set(vertex, x, y);
81        vertex[0].alpha = alpha;
82    }
83
84    static inline void setColor(AlphaVertex* vertex, float alpha) {
85        vertex[0].alpha = alpha;
86    }
87}; // struct AlphaVertex
88
89}; // namespace uirenderer
90}; // namespace android
91
92#endif // ANDROID_HWUI_VERTEX_H
93