b8794ccea2
BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2184163003 Review-Url: https://codereview.chromium.org/2184163003
127 lines
3.3 KiB
C++
127 lines
3.3 KiB
C++
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/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "WindowContextFactory_win.h"
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#include <GL/gl.h>
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// windows stuff
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#include "win/SkWGL.h"
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#include "../GLWindowContext.h"
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using sk_app::GLWindowContext;
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using sk_app::DisplayParams;
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namespace {
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class GLWindowContext_win : public GLWindowContext {
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public:
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GLWindowContext_win(HWND, const DisplayParams&);
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~GLWindowContext_win() override;
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protected:
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void onSwapBuffers() override;
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void onInitializeContext() override;
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void onDestroyContext() override;
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private:
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HWND fHWND;
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HGLRC fHGLRC;
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};
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GLWindowContext_win::GLWindowContext_win(HWND wnd, const DisplayParams& params)
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: GLWindowContext(params)
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, fHWND(wnd)
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, fHGLRC(NULL) {
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// any config code here (particularly for msaa)?
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this->initializeContext();
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}
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GLWindowContext_win::~GLWindowContext_win() {
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this->destroyContext();
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}
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void GLWindowContext_win::onInitializeContext() {
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HDC dc = GetDC(fHWND);
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fHGLRC = SkCreateWGLContext(dc, fDisplayParams.fMSAASampleCount, fDisplayParams.fDeepColor,
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kGLPreferCompatibilityProfile_SkWGLContextRequest);
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if (NULL == fHGLRC) {
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return;
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}
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if (wglMakeCurrent(dc, fHGLRC)) {
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glClearStencil(0);
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glClearColor(0, 0, 0, 0);
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glStencilMask(0xffffffff);
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glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
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// use DescribePixelFormat to get the stencil and color bit depth.
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int pixelFormat = GetPixelFormat(dc);
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PIXELFORMATDESCRIPTOR pfd;
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DescribePixelFormat(dc, pixelFormat, sizeof(pfd), &pfd);
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fStencilBits = pfd.cStencilBits;
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// pfd.cColorBits includes alpha, so it will be 32 in 8/8/8/8 and 10/10/10/2
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fColorBits = pfd.cRedBits + pfd.cGreenBits + pfd.cBlueBits;
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// Get sample count if the MSAA WGL extension is present
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SkWGLExtensions extensions;
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if (extensions.hasExtension(dc, "WGL_ARB_multisample")) {
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static const int kSampleCountAttr = SK_WGL_SAMPLES;
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extensions.getPixelFormatAttribiv(dc,
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pixelFormat,
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0,
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1,
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&kSampleCountAttr,
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&fSampleCount);
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} else {
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fSampleCount = 0;
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}
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RECT rect;
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GetClientRect(fHWND, &rect);
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fWidth = rect.right - rect.left;
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fHeight = rect.bottom - rect.top;
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glViewport(0, 0, fWidth, fHeight);
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}
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}
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void GLWindowContext_win::onDestroyContext() {
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wglDeleteContext(fHGLRC);
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fHGLRC = NULL;
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}
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void GLWindowContext_win::onSwapBuffers() {
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HDC dc = GetDC((HWND)fHWND);
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SwapBuffers(dc);
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ReleaseDC((HWND)fHWND, dc);
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}
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} // anonymous namespace
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namespace sk_app {
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namespace window_context_factory {
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WindowContext* NewGLForWin(HWND wnd, const DisplayParams& params) {
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GLWindowContext_win* ctx = new GLWindowContext_win(wnd, params);
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if (!ctx->isValid()) {
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delete ctx;
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return nullptr;
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}
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return ctx;
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}
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} // namespace window_context_factory
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} // namespace sk_app
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