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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "../GLWindowContext.h"
#include "WindowContextFactory_unix.h"
#include <GL/gl.h>
using sk_app::window_context_factory::XlibWindowInfo;
using sk_app::DisplayParams;
using sk_app::GLWindowContext;
namespace {
class GLWindowContext_xlib : public GLWindowContext {
public:
GLWindowContext_xlib(const XlibWindowInfo&, const DisplayParams&);
~GLWindowContext_xlib() override;
void onSwapBuffers() override;
void onDestroyContext() override;
protected:
void onInitializeContext() override;
private:
GLWindowContext_xlib(void*, const DisplayParams&);
Display* fDisplay;
XWindow fWindow;
GLXFBConfig* fFBConfig;
XVisualInfo* fVisualInfo;
GLXContext fGLContext;
typedef GLWindowContext INHERITED;
};
GLWindowContext_xlib::GLWindowContext_xlib(const XlibWindowInfo& winInfo, const DisplayParams& params)
: INHERITED(params)
, fDisplay(winInfo.fDisplay)
, fWindow(winInfo.fWindow)
, fFBConfig(winInfo.fFBConfig)
, fVisualInfo(winInfo.fVisualInfo)
, fGLContext() {
fWidth = winInfo.fWidth;
fHeight = winInfo.fHeight;
this->initializeContext();
}
using CreateContextAttribsFn = GLXContext(Display*, GLXFBConfig, GLXContext, Bool, const int*);
void GLWindowContext_xlib::onInitializeContext() {
SkASSERT(fDisplay);
SkASSERT(!fGLContext);
// We attempt to use glXCreateContextAttribsARB as RenderDoc requires that the context be
// created with this rather than glXCreateContext.
CreateContextAttribsFn* createContextAttribs = (CreateContextAttribsFn*)glXGetProcAddressARB(
(const GLubyte*)"glXCreateContextAttribsARB");
if (createContextAttribs && fFBConfig) {
// Specifying 3.2 allows an arbitrarily high context version (so long as no 3.2 features
// have been removed).
for (int minor = 2; minor >= 0 && !fGLContext; --minor) {
// Ganesh prefers a compatibility profile for possible NVPR support. However, RenderDoc
// requires a core profile. Edit this code to use RenderDoc.
for (int profile : {GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB,
GLX_CONTEXT_CORE_PROFILE_BIT_ARB}) {
int attribs[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 3, GLX_CONTEXT_MINOR_VERSION_ARB, minor,
GLX_CONTEXT_PROFILE_MASK_ARB, profile,
0
};
fGLContext = createContextAttribs(fDisplay, *fFBConfig, nullptr, True, attribs);
if (fGLContext) {
break;
}
}
}
}
if (!fGLContext) {
fGLContext = glXCreateContext(fDisplay, fVisualInfo, nullptr, GL_TRUE);
}
if (!fGLContext) {
return;
}
if (glXMakeCurrent(fDisplay, fWindow, fGLContext)) {
glClearStencil(0);
glClearColor(0, 0, 0, 0);
glStencilMask(0xffffffff);
glClear(GL_STENCIL_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
glXGetConfig(fDisplay, fVisualInfo, GLX_STENCIL_SIZE, &fStencilBits);
glXGetConfig(fDisplay, fVisualInfo, GLX_SAMPLES_ARB, &fSampleCount);
XWindow root;
int x, y;
unsigned int border_width, depth;
XGetGeometry(fDisplay, fWindow, &root, &x, &y,
(unsigned int*)&fWidth, (unsigned int*)&fHeight, &border_width, &depth);
glViewport(0, 0, fWidth, fHeight);
}
}
GLWindowContext_xlib::~GLWindowContext_xlib() {
this->destroyContext();
}
void GLWindowContext_xlib::onDestroyContext() {
if (!fDisplay || !fGLContext) {
return;
}
glXMakeCurrent(fDisplay, None, nullptr);
glXDestroyContext(fDisplay, fGLContext);
fGLContext = nullptr;
}
void GLWindowContext_xlib::onSwapBuffers() {
if (fDisplay && fGLContext) {
glXSwapBuffers(fDisplay, fWindow);
}
}
} // anonymous namespace
namespace sk_app {
namespace window_context_factory {
WindowContext* NewGLForXlib(const XlibWindowInfo& winInfo, const DisplayParams& params) {
WindowContext* ctx = new GLWindowContext_xlib(winInfo, params);
if (!ctx->isValid()) {
delete ctx;
return nullptr;
}
return ctx;
}
} // namespace window_context_factory
} // namespace sk_app
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