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
22#include "utils/Macros.h"
23
24namespace android {
25namespace uirenderer {
26
27/**
28 * Simple structure to describe a vertex with a position and a texture.
29 */
30struct Vertex {
31    /**
32     * Fudge-factor used to disambiguate geometry pixel positioning.
33     *
34     * Used to offset lines and points to avoid ambiguous intersection with pixel centers (see
35     * Program::set()), and used to make geometry damage rect calculation conservative (see
36     * Rect::snapGeometryToPixelBoundaries())
37     */
38    static float GeometryFudgeFactor() { return 0.0656f; }
39
40
41    float x, y;
42
43    static inline void set(Vertex* vertex, float x, float y) {
44        vertex->x = x;
45        vertex->y = y;
46    }
47
48    static inline void set(Vertex* vertex, Vector2 val) {
49        set(vertex, val.x, val.y);
50    }
51
52    static inline void copyWithOffset(Vertex* vertex, const Vertex& src, float x, float y) {
53        set(vertex, src.x + x, src.y + y);
54    }
55
56}; // struct Vertex
57
58REQUIRE_COMPATIBLE_LAYOUT(Vertex);
59
60/**
61 * Simple structure to describe a vertex with a position and texture UV.
62 */
63struct TextureVertex {
64    float x, y;
65    float u, v;
66
67    static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
68        *vertex = { x, y, u, v };
69    }
70
71    static inline void setUV(TextureVertex* vertex, float u, float v) {
72        vertex[0].u = u;
73        vertex[0].v = v;
74    }
75}; // struct TextureVertex
76
77REQUIRE_COMPATIBLE_LAYOUT(TextureVertex);
78
79/**
80 * Simple structure to describe a vertex with a position, texture UV and ARGB color.
81 */
82struct ColorTextureVertex {
83    float x, y;
84    float u, v;
85    float r, g, b, a;
86
87    static inline void set(ColorTextureVertex* vertex, float x, float y,
88            float u, float v, int color) {
89
90        float a =     ((color >> 24) & 0xff) / 255.0f;
91        float r = a * ((color >> 16) & 0xff) / 255.0f;
92        float g = a * ((color >>  8) & 0xff) / 255.0f;
93        float b = a * ((color) & 0xff) / 255.0f;
94        *vertex = { x, y, u, v, r, g, b, a };
95    }
96}; // struct ColorTextureVertex
97
98REQUIRE_COMPATIBLE_LAYOUT(ColorTextureVertex);
99
100/**
101 * Simple structure to describe a vertex with a position and an alpha value.
102 */
103struct AlphaVertex {
104    float x, y;
105    float alpha;
106
107    static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
108        *vertex = { x, y, alpha };
109    }
110
111    static inline void copyWithOffset(AlphaVertex* vertex, const AlphaVertex& src,
112            float x, float y) {
113        AlphaVertex::set(vertex, src.x + x, src.y + y, src.alpha);
114    }
115
116    static inline void setColor(AlphaVertex* vertex, float alpha) {
117        vertex[0].alpha = alpha;
118    }
119}; // struct AlphaVertex
120
121REQUIRE_COMPATIBLE_LAYOUT(AlphaVertex);
122
123}; // namespace uirenderer
124}; // namespace android
125
126#endif // ANDROID_HWUI_VERTEX_H
127