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      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 
     18 #ifndef SF_RENDERENGINE_H_
     19 #define SF_RENDERENGINE_H_
     20 
     21 #include <stdint.h>
     22 #include <sys/types.h>
     23 
     24 #include <EGL/egl.h>
     25 #include <EGL/eglext.h>
     26 #include <ui/mat4.h>
     27 #include <Transform.h>
     28 
     29 #define EGL_NO_CONFIG ((EGLConfig)0)
     30 
     31 // ---------------------------------------------------------------------------
     32 namespace android {
     33 // ---------------------------------------------------------------------------
     34 
     35 class String8;
     36 class Rect;
     37 class Region;
     38 class Mesh;
     39 class Texture;
     40 
     41 class RenderEngine {
     42     enum GlesVersion {
     43         GLES_VERSION_1_0    = 0x10000,
     44         GLES_VERSION_1_1    = 0x10001,
     45         GLES_VERSION_2_0    = 0x20000,
     46         GLES_VERSION_3_0    = 0x30000,
     47     };
     48     static GlesVersion parseGlesVersion(const char* str);
     49 
     50     EGLConfig mEGLConfig;
     51     EGLContext mEGLContext;
     52     void setEGLHandles(EGLConfig config, EGLContext ctxt);
     53 
     54     virtual void bindImageAsFramebuffer(EGLImageKHR image, uint32_t* texName, uint32_t* fbName, uint32_t* status) = 0;
     55     virtual void unbindFramebuffer(uint32_t texName, uint32_t fbName) = 0;
     56 
     57 protected:
     58     RenderEngine();
     59     virtual ~RenderEngine() = 0;
     60 
     61 public:
     62     static RenderEngine* create(EGLDisplay display, int hwcFormat);
     63 
     64     static EGLConfig chooseEglConfig(EGLDisplay display, int format);
     65 
     66     void primeCache() const;
     67 
     68     // dump the extension strings. always call the base class.
     69     virtual void dump(String8& result);
     70 
     71     // helpers
     72     void flush();
     73     void clearWithColor(float red, float green, float blue, float alpha);
     74     void fillRegionWithColor(const Region& region, uint32_t height,
     75             float red, float green, float blue, float alpha);
     76 
     77     // common to all GL versions
     78     void setScissor(uint32_t left, uint32_t bottom, uint32_t right, uint32_t top);
     79     void disableScissor();
     80     void genTextures(size_t count, uint32_t* names);
     81     void deleteTextures(size_t count, uint32_t const* names);
     82     void readPixels(size_t l, size_t b, size_t w, size_t h, uint32_t* pixels);
     83 
     84     class BindImageAsFramebuffer {
     85         RenderEngine& mEngine;
     86         uint32_t mTexName, mFbName;
     87         uint32_t mStatus;
     88     public:
     89         BindImageAsFramebuffer(RenderEngine& engine, EGLImageKHR image);
     90         ~BindImageAsFramebuffer();
     91         int getStatus() const;
     92     };
     93 
     94     // set-up
     95     virtual void checkErrors() const;
     96     virtual void setViewportAndProjection(size_t vpw, size_t vph,
     97             Rect sourceCrop, size_t hwh, bool yswap, Transform::orientation_flags rotation) = 0;
     98 #ifdef USE_HWC2
     99     virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, float alpha) = 0;
    100     virtual void setupDimLayerBlending(float alpha) = 0;
    101 #else
    102     virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, int alpha) = 0;
    103     virtual void setupDimLayerBlending(int alpha) = 0;
    104 #endif
    105     virtual void setupLayerTexturing(const Texture& texture) = 0;
    106     virtual void setupLayerBlackedOut() = 0;
    107     virtual void setupFillWithColor(float r, float g, float b, float a) = 0;
    108 
    109     virtual mat4 setupColorTransform(const mat4& /* colorTransform */) {
    110         return mat4();
    111     }
    112 
    113     virtual void disableTexturing() = 0;
    114     virtual void disableBlending() = 0;
    115 
    116     // drawing
    117     virtual void drawMesh(const Mesh& mesh) = 0;
    118 
    119     // queries
    120     virtual size_t getMaxTextureSize() const = 0;
    121     virtual size_t getMaxViewportDims() const = 0;
    122 
    123     EGLConfig getEGLConfig() const;
    124     EGLContext getEGLContext() const;
    125 };
    126 
    127 // ---------------------------------------------------------------------------
    128 }; // namespace android
    129 // ---------------------------------------------------------------------------
    130 
    131 #endif /* SF_RENDERENGINE_H_ */
    132