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      1 
      2 /*
      3  * Copyright 2015 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 #include "GrContext.h"
     10 #include "SkSurface.h"
     11 #include "GLWindowContext.h"
     12 
     13 #include "gl/GrGLDefines.h"
     14 
     15 #include "gl/GrGLUtil.h"
     16 #include "GrRenderTarget.h"
     17 #include "GrContext.h"
     18 
     19 #include "SkCanvas.h"
     20 #include "SkImage_Base.h"
     21 #include "SkMathPriv.h"
     22 
     23 namespace sk_app {
     24 
     25 GLWindowContext::GLWindowContext(const DisplayParams& params)
     26     : WindowContext()
     27     , fBackendContext(nullptr)
     28     , fSurface(nullptr) {
     29     fDisplayParams = params;
     30     fDisplayParams.fMSAASampleCount = fDisplayParams.fMSAASampleCount ?
     31                                       GrNextPow2(fDisplayParams.fMSAASampleCount) :
     32                                       0;
     33 }
     34 
     35 void GLWindowContext::initializeContext() {
     36     this->onInitializeContext();
     37     SkASSERT(nullptr == fContext);
     38 
     39     fBackendContext.reset(GrGLCreateNativeInterface());
     40     fContext = GrContext::Create(kOpenGL_GrBackend, (GrBackendContext)fBackendContext.get(),
     41                                  fDisplayParams.fGrContextOptions);
     42     if (!fContext && fDisplayParams.fMSAASampleCount) {
     43         fDisplayParams.fMSAASampleCount /= 2;
     44         this->initializeContext();
     45         return;
     46     }
     47 
     48     if (fContext) {
     49         // We may not have real sRGB support (ANGLE, in particular), so check for
     50         // that, and fall back to L32:
     51         fPixelConfig = fContext->caps()->srgbSupport() && fDisplayParams.fColorSpace
     52                        ? kSRGBA_8888_GrPixelConfig : kRGBA_8888_GrPixelConfig;
     53     } else {
     54         fPixelConfig = kUnknown_GrPixelConfig;
     55     }
     56 }
     57 
     58 void GLWindowContext::destroyContext() {
     59     fSurface.reset(nullptr);
     60 
     61     if (fContext) {
     62         // in case we have outstanding refs to this guy (lua?)
     63         fContext->abandonContext();
     64         fContext->unref();
     65         fContext = nullptr;
     66     }
     67 
     68     fBackendContext.reset(nullptr);
     69 
     70     this->onDestroyContext();
     71 }
     72 
     73 sk_sp<SkSurface> GLWindowContext::getBackbufferSurface() {
     74     if (nullptr == fSurface) {
     75         if (fContext) {
     76             GrBackendRenderTargetDesc desc;
     77             desc.fWidth = this->fWidth;
     78             desc.fHeight = this->fHeight;
     79             desc.fConfig = fPixelConfig;
     80             desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
     81             desc.fSampleCnt = fSampleCount;
     82             desc.fStencilBits = fStencilBits;
     83             GrGLint buffer;
     84             GR_GL_CALL(fBackendContext.get(), GetIntegerv(GR_GL_FRAMEBUFFER_BINDING, &buffer));
     85             desc.fRenderTargetHandle = buffer;
     86 
     87             fSurface = SkSurface::MakeFromBackendRenderTarget(fContext, desc,
     88                                                               fDisplayParams.fColorSpace,
     89                                                               &fSurfaceProps);
     90         }
     91     }
     92 
     93     return fSurface;
     94 }
     95 
     96 void GLWindowContext::swapBuffers() {
     97     this->onSwapBuffers();
     98 }
     99 
    100 void GLWindowContext::resize(int  w, int h) {
    101     this->destroyContext();
    102     this->initializeContext();
    103 }
    104 
    105 void GLWindowContext::setDisplayParams(const DisplayParams& params) {
    106     this->destroyContext();
    107     fDisplayParams = params;
    108     this->initializeContext();
    109 }
    110 
    111 }   //namespace sk_app
    112