1 /*
2  * Copyright 2013 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 SF_GLES20RENDERENGINE_H_
18 #define SF_GLES20RENDERENGINE_H_
19 
20 #include <stdint.h>
21 #include <sys/types.h>
22 
23 #include <GLES2/gl2.h>
24 #include <Transform.h>
25 
26 #include "Description.h"
27 #include "ProgramCache.h"
28 #include "RenderEngine.h"
29 
30 // ---------------------------------------------------------------------------
31 namespace android {
32 // ---------------------------------------------------------------------------
33 
34 class String8;
35 class Mesh;
36 class Texture;
37 
38 namespace RE {
39 namespace impl {
40 
41 class GLES20RenderEngine : public RenderEngine {
42     GLuint mProtectedTexName;
43     GLint mMaxViewportDims[2];
44     GLint mMaxTextureSize;
45     GLuint mVpWidth;
46     GLuint mVpHeight;
47 
48     struct Group {
49         GLuint texture;
50         GLuint fbo;
51         GLuint width;
52         GLuint height;
53         mat4 colorTransform;
54     };
55 
56     Description mState;
57     Vector<Group> mGroupStack;
58 
59     virtual void bindImageAsFramebuffer(EGLImageKHR image, uint32_t* texName, uint32_t* fbName,
60                                         uint32_t* status);
61     virtual void unbindFramebuffer(uint32_t texName, uint32_t fbName);
62 
63 public:
64     GLES20RenderEngine(uint32_t featureFlags); // See RenderEngine::FeatureFlag
65     virtual ~GLES20RenderEngine();
66 
67 protected:
68     virtual void dump(String8& result);
69     virtual void setViewportAndProjection(size_t vpw, size_t vph, Rect sourceCrop, size_t hwh,
70                                           bool yswap, Transform::orientation_flags rotation);
71     virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, bool disableTexture,
72                                     const half4& color) override;
73 
74     // Color management related functions and state
75     void setSourceY410BT2020(bool enable) override;
76     void setSourceDataSpace(ui::Dataspace source) override;
77     void setOutputDataSpace(ui::Dataspace dataspace) override;
78     void setDisplayMaxLuminance(const float maxLuminance) override;
79 
80     virtual void setupLayerTexturing(const Texture& texture);
81     virtual void setupLayerBlackedOut();
82     virtual void setupFillWithColor(float r, float g, float b, float a);
83     virtual void setupColorTransform(const mat4& colorTransform);
84     virtual void setSaturationMatrix(const mat4& saturationMatrix);
85     virtual void disableTexturing();
86     virtual void disableBlending();
87 
88     virtual void drawMesh(const Mesh& mesh);
89 
90     virtual size_t getMaxTextureSize() const;
91     virtual size_t getMaxViewportDims() const;
92 
93     // Current dataspace of layer being rendered
94     ui::Dataspace mDataSpace = ui::Dataspace::UNKNOWN;
95 
96     // Current output dataspace of the render engine
97     ui::Dataspace mOutputDataSpace = ui::Dataspace::UNKNOWN;
98 
99     // Currently only supporting sRGB, BT2020 and DisplayP3 color spaces
100     const bool mPlatformHasWideColor = false;
101     mat4 mSrgbToDisplayP3;
102     mat4 mDisplayP3ToSrgb;
103     mat3 mSrgbToXyz;
104     mat3 mBt2020ToXyz;
105     mat3 mDisplayP3ToXyz;
106     mat4 mXyzToSrgb;
107     mat4 mXyzToDisplayP3;
108     mat4 mXyzToBt2020;
109 
110 private:
111     // A data space is considered HDR data space if it has BT2020 color space
112     // with PQ or HLG transfer function.
113     bool isHdrDataSpace(const ui::Dataspace dataSpace) const;
114     bool needsXYZTransformMatrix() const;
115 };
116 
117 // ---------------------------------------------------------------------------
118 } // namespace impl
119 } // namespace RE
120 } // namespace android
121 // ---------------------------------------------------------------------------
122 
123 #endif /* SF_GLES20RENDERENGINE_H_ */
124