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_SKIA_SHADER_H
18 #define ANDROID_HWUI_SKIA_SHADER_H
19 
20 #include "FloatColor.h"
21 #include "Matrix.h"
22 
23 #include <GLES2/gl2.h>
24 #include <SkShader.h>
25 #include <SkXfermode.h>
26 #include <cutils/compiler.h>
27 
28 namespace android {
29 namespace uirenderer {
30 
31 class Caches;
32 class Extensions;
33 class Layer;
34 class Texture;
35 struct ProgramDescription;
36 
37 /**
38  * Type of Skia shader in use.
39  *
40  * Note that kBitmap | kGradient = kCompose, since Compose implies
41  * both its component types are in use simultaneously. No other
42  * composition of multiple types is supported.
43  */
44 enum SkiaShaderType {
45     kNone_SkiaShaderType = 0,
46     kBitmap_SkiaShaderType = 1,
47     kGradient_SkiaShaderType = 2,
48     kCompose_SkiaShaderType = kBitmap_SkiaShaderType | kGradient_SkiaShaderType,
49     kLayer_SkiaShaderType = 4,
50 };
51 
52 struct SkiaShaderData {
53     SkiaShaderType skiaShaderType;
54     struct BitmapShaderData {
55         Texture* bitmapTexture;
56         GLuint bitmapSampler;
57         GLenum wrapS;
58         GLenum wrapT;
59 
60         Matrix4 textureTransform;
61         float textureDimension[2];
62     } bitmapData;
63     struct GradientShaderData {
64         Matrix4 screenSpace;
65         GLuint ditherSampler;
66 
67         // simple gradient
68         FloatColor startColor;
69         FloatColor endColor;
70 
71         // complex gradient
72         Texture* gradientTexture;
73         GLuint gradientSampler;
74         GLenum wrapST;
75 
76     } gradientData;
77     struct LayerShaderData {
78         Layer* layer;
79         GLuint bitmapSampler;
80         GLenum wrapS;
81         GLenum wrapT;
82 
83         Matrix4 textureTransform;
84         float textureDimension[2];
85     } layerData;
86 };
87 
88 class SkiaShader {
89 public:
90     static void store(Caches& caches, const SkShader& shader, const Matrix4& modelViewMatrix,
91             GLuint* textureUnit, ProgramDescription* description,
92             SkiaShaderData* outData);
93     static void apply(Caches& caches, const SkiaShaderData& data);
94 };
95 
96 }; // namespace uirenderer
97 }; // namespace android
98 
99 #endif // ANDROID_HWUI_SKIA_SHADER_H
100