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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkGLWidget.h"
#if SK_SUPPORT_GPU
SkGLWidget::SkGLWidget(SkDebugger* debugger) : QGLWidget() {
fDebugger = debugger;
}
SkGLWidget::~SkGLWidget() {
}
void SkGLWidget::setSampleCount(int sampleCount) {
QGLFormat currentFormat = format();
currentFormat.setSampleBuffers(sampleCount > 0);
currentFormat.setSamples(sampleCount);
setFormat(currentFormat);
}
void SkGLWidget::initializeGL() {
if (!fCurIntf) {
fCurIntf.reset(GrGLCreateNativeInterface());
}
if (!fCurIntf) {
return;
}
// The call may come multiple times, for example after setSampleCount(). The QGLContext will be
// different, but we do not have a mechanism to catch the destroying of QGLContext, so that
// proper resource cleanup could be made.
if (fCurContext) {
fCurContext->abandonContext();
}
fGpuSurface = nullptr;
fCanvas = nullptr;
fCurContext.reset(GrContext::Create(kOpenGL_GrBackend, (GrBackendContext) fCurIntf.get()));
}
void SkGLWidget::createRenderTarget() {
if (!fCurContext) {
return;
}
glDisable(GL_SCISSOR_TEST);
glStencilMask(0xffffffff);
glClearStencil(0);
glClear(GL_STENCIL_BUFFER_BIT);
fCurContext->resetContext();
GrBackendRenderTargetDesc desc = this->getDesc(this->width(), this->height());
desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
fGpuSurface = SkSurface::MakeFromBackendRenderTarget(fCurContext.get(), desc, nullptr);
fCanvas = fGpuSurface->getCanvas();
}
void SkGLWidget::resizeGL(int w, int h) {
SkASSERT(w == this->width() && h == this->height());
this->createRenderTarget();
}
void SkGLWidget::paintGL() {
if (!this->isHidden() && fCanvas) {
fCurContext->resetContext();
fDebugger->draw(fCanvas);
// TODO(chudy): Implement an optional flush button in Gui.
fCanvas->flush();
Q_EMIT drawComplete();
}
}
GrBackendRenderTargetDesc SkGLWidget::getDesc(int w, int h) {
GrBackendRenderTargetDesc desc;
desc.fWidth = SkScalarRoundToInt(this->width());
desc.fHeight = SkScalarRoundToInt(this->height());
desc.fConfig = kSkia8888_GrPixelConfig;
GR_GL_GetIntegerv(fCurIntf.get(), GR_GL_SAMPLES, &desc.fSampleCnt);
GR_GL_GetIntegerv(fCurIntf.get(), GR_GL_STENCIL_BITS, &desc.fStencilBits);
GrGLint buffer;
GR_GL_GetIntegerv(fCurIntf.get(), GR_GL_FRAMEBUFFER_BINDING, &buffer);
desc.fRenderTargetHandle = buffer;
return desc;
}
#endif
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