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    float x, y;
41
42    static inline void set(Vertex* vertex, float x, float y) {
43        vertex->x = x;
44        vertex->y = y;
45    }
46
47    static inline void set(Vertex* vertex, Vector2 val) {
48        set(vertex, val.x, val.y);
49    }
50
51    static inline void copyWithOffset(Vertex* vertex, const Vertex& src, float x, float y) {
52        set(vertex, src.x + x, src.y + y);
53    }
54
55}; // struct Vertex
56
57REQUIRE_COMPATIBLE_LAYOUT(Vertex);
58
59/**
60 * Simple structure to describe a vertex with a position and texture UV.
61 */
62struct TextureVertex {
63    float x, y;
64    float u, v;
65
66    static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
67        *vertex = { x, y, u, v };
68    }
69
70    static inline void setUV(TextureVertex* vertex, float u, float v) {
71        vertex[0].u = u;
72        vertex[0].v = v;
73    }
74}; // struct TextureVertex
75
76REQUIRE_COMPATIBLE_LAYOUT(TextureVertex);
77
78/**
79 * Simple structure to describe a vertex with a position, texture UV and ARGB color.
80 */
81struct ColorTextureVertex {
82    float x, y;
83    float u, v;
84    float r, g, b, a;
85
86    static inline void set(ColorTextureVertex* vertex, float x, float y,
87            float u, float v, int color) {
88
89        float a =     ((color >> 24) & 0xff) / 255.0f;
90        float r = a * ((color >> 16) & 0xff) / 255.0f;
91        float g = a * ((color >>  8) & 0xff) / 255.0f;
92        float b = a * ((color) & 0xff) / 255.0f;
93        *vertex = { x, y, u, v, r, g, b, a };
94    }
95}; // struct ColorTextureVertex
96
97REQUIRE_COMPATIBLE_LAYOUT(ColorTextureVertex);
98
99/**
100 * Simple structure to describe a vertex with a position and an alpha value.
101 */
102struct AlphaVertex {
103    float x, y;
104    float alpha;
105
106    static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
107        *vertex = { x, y, alpha };
108    }
109
110    static inline void copyWithOffset(AlphaVertex* vertex, const AlphaVertex& src,
111            float x, float y) {
112        AlphaVertex::set(vertex, src.x + x, src.y + y, src.alpha);
113    }
114
115    static inline void setColor(AlphaVertex* vertex, float alpha) {
116        vertex[0].alpha = alpha;
117    }
118}; // struct AlphaVertex
119
120REQUIRE_COMPATIBLE_LAYOUT(AlphaVertex);
121
122}; // namespace uirenderer
123}; // namespace android
124
125#endif // ANDROID_HWUI_VERTEX_H
126