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      1 
      2 /*
      3  * Copyright 2012 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 
     10 #include "SkGLWidget.h"
     11 
     12 #if SK_SUPPORT_GPU
     13 
     14 SkGLWidget::SkGLWidget(SkDebugger* debugger) : QGLWidget() {
     15     fDebugger = debugger;
     16 }
     17 
     18 SkGLWidget::~SkGLWidget() {
     19 }
     20 
     21 void SkGLWidget::setSampleCount(int sampleCount) {
     22     QGLFormat currentFormat = format();
     23     currentFormat.setSampleBuffers(sampleCount > 0);
     24     currentFormat.setSamples(sampleCount);
     25     setFormat(currentFormat);
     26 }
     27 
     28 void SkGLWidget::initializeGL() {
     29     if (!fCurIntf) {
     30         fCurIntf.reset(GrGLCreateNativeInterface());
     31     }
     32     if (!fCurIntf) {
     33         return;
     34     }
     35     // The call may come multiple times, for example after setSampleCount().  The QGLContext will be
     36     // different, but we do not have a mechanism to catch the destroying of QGLContext, so that
     37     // proper resource cleanup could be made.
     38     if (fCurContext) {
     39         fCurContext->abandonContext();
     40     }
     41     fGpuDevice.reset(nullptr);
     42     fCanvas.reset(nullptr);
     43 
     44     fCurContext.reset(GrContext::Create(kOpenGL_GrBackend, (GrBackendContext) fCurIntf.get()));
     45 }
     46 
     47 void SkGLWidget::createRenderTarget() {
     48     if (!fCurContext) {
     49         return;
     50     }
     51 
     52     glDisable(GL_SCISSOR_TEST);
     53     glStencilMask(0xffffffff);
     54     glClearStencil(0);
     55     glClear(GL_STENCIL_BUFFER_BIT);
     56     fCurContext->resetContext();
     57 
     58     fGpuDevice.reset(nullptr);
     59     fCanvas.reset(nullptr);
     60 
     61     GrBackendRenderTargetDesc desc = this->getDesc(this->width(), this->height());
     62     desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
     63     SkAutoTUnref<GrRenderTarget> curRenderTarget(
     64             fCurContext->textureProvider()->wrapBackendRenderTarget(desc));
     65     SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
     66     fGpuDevice.reset(SkGpuDevice::Create(curRenderTarget, &props,
     67                                          SkGpuDevice::kUninit_InitContents));
     68     fCanvas.reset(new SkCanvas(fGpuDevice));
     69 }
     70 
     71 void SkGLWidget::resizeGL(int w, int h) {
     72     SkASSERT(w == this->width() && h == this->height());
     73     this->createRenderTarget();
     74 }
     75 
     76 void SkGLWidget::paintGL() {
     77     if (!this->isHidden() && fCanvas) {
     78         fCurContext->resetContext();
     79         fDebugger->draw(fCanvas.get());
     80         // TODO(chudy): Implement an optional flush button in Gui.
     81         fCanvas->flush();
     82         emit drawComplete();
     83     }
     84 }
     85 
     86 GrBackendRenderTargetDesc SkGLWidget::getDesc(int w, int h) {
     87     GrBackendRenderTargetDesc desc;
     88     desc.fWidth = SkScalarRoundToInt(this->width());
     89     desc.fHeight = SkScalarRoundToInt(this->height());
     90     desc.fConfig = kSkia8888_GrPixelConfig;
     91     GR_GL_GetIntegerv(fCurIntf, GR_GL_SAMPLES, &desc.fSampleCnt);
     92     GR_GL_GetIntegerv(fCurIntf, GR_GL_STENCIL_BITS, &desc.fStencilBits);
     93     GrGLint buffer;
     94     GR_GL_GetIntegerv(fCurIntf, GR_GL_FRAMEBUFFER_BINDING, &buffer);
     95     desc.fRenderTargetHandle = buffer;
     96 
     97     return desc;
     98 }
     99 
    100 #endif
    101