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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 
     42     fGpuSurface = nullptr;
     43     fCanvas = nullptr;
     44 
     45     fCurContext.reset(GrContext::Create(kOpenGL_GrBackend, (GrBackendContext) fCurIntf.get()));
     46 }
     47 
     48 void SkGLWidget::createRenderTarget() {
     49     if (!fCurContext) {
     50         return;
     51     }
     52 
     53     glDisable(GL_SCISSOR_TEST);
     54     glStencilMask(0xffffffff);
     55     glClearStencil(0);
     56     glClear(GL_STENCIL_BUFFER_BIT);
     57     fCurContext->resetContext();
     58 
     59     GrBackendRenderTargetDesc desc = this->getDesc(this->width(), this->height());
     60     desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
     61 
     62     fGpuSurface = SkSurface::MakeFromBackendRenderTarget(fCurContext.get(), desc, nullptr);
     63     fCanvas = fGpuSurface->getCanvas();
     64 }
     65 
     66 void SkGLWidget::resizeGL(int w, int h) {
     67     SkASSERT(w == this->width() && h == this->height());
     68     this->createRenderTarget();
     69 }
     70 
     71 void SkGLWidget::paintGL() {
     72     if (!this->isHidden() && fCanvas) {
     73         fCurContext->resetContext();
     74         fDebugger->draw(fCanvas);
     75         // TODO(chudy): Implement an optional flush button in Gui.
     76         fCanvas->flush();
     77         Q_EMIT drawComplete();
     78     }
     79 }
     80 
     81 GrBackendRenderTargetDesc SkGLWidget::getDesc(int w, int h) {
     82     GrBackendRenderTargetDesc desc;
     83     desc.fWidth = SkScalarRoundToInt(this->width());
     84     desc.fHeight = SkScalarRoundToInt(this->height());
     85     desc.fConfig = kSkia8888_GrPixelConfig;
     86     GR_GL_GetIntegerv(fCurIntf.get(), GR_GL_SAMPLES, &desc.fSampleCnt);
     87     GR_GL_GetIntegerv(fCurIntf.get(), GR_GL_STENCIL_BITS, &desc.fStencilBits);
     88     GrGLint buffer;
     89     GR_GL_GetIntegerv(fCurIntf.get(), GR_GL_FRAMEBUFFER_BINDING, &buffer);
     90     desc.fRenderTargetHandle = buffer;
     91 
     92     return desc;
     93 }
     94 
     95 #endif
     96