skia2/tools/sk_app/unix/GLWindowContext_unix.cpp

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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 "include/gpu/gl/GrGLInterface.h"
#include "tools/sk_app/GLWindowContext.h"
#include "tools/sk_app/unix/WindowContextFactory_unix.h"
#include <GL/gl.h>
using sk_app::window_context_factory::XlibWindowInfo;
using sk_app::DisplayParams;
using sk_app::GLWindowContext;
namespace {
static bool gCtxErrorOccurred = false;
static int ctxErrorHandler(Display *dpy, XErrorEvent *ev) {
gCtxErrorOccurred = true;
return 0;
}
class GLWindowContext_xlib : public GLWindowContext {
public:
GLWindowContext_xlib(const XlibWindowInfo&, const DisplayParams&);
~GLWindowContext_xlib() override;
void onSwapBuffers() override;
void onDestroyContext() override;
protected:
sk_sp<const GrGLInterface> onInitializeContext() override;
private:
GLWindowContext_xlib(void*, const DisplayParams&);
Display* fDisplay;
XWindow fWindow;
GLXFBConfig* fFBConfig;
XVisualInfo* fVisualInfo;
GLXContext fGLContext;
using INHERITED = GLWindowContext;
};
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*);
sk_sp<const GrGLInterface> GLWindowContext_xlib::onInitializeContext() {
SkASSERT(fDisplay);
SkASSERT(!fGLContext);
sk_sp<const GrGLInterface> interface;
bool current = false;
// 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) {
// Install Xlib error handler that will set gCtxErrorOccurred
int (*oldHandler)(Display*, XErrorEvent*) = XSetErrorHandler(&ctxErrorHandler);
// 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}) {
gCtxErrorOccurred = false;
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);
// Sync to ensure any errors generated are processed.
XSync(fDisplay, False);
if (gCtxErrorOccurred) { continue; }
if (fGLContext && profile == GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB &&
glXMakeCurrent(fDisplay, fWindow, fGLContext)) {
current = true;
// Look to see if RenderDoc is attached. If so, re-create the context with a
// core profile.
interface = GrGLMakeNativeInterface();
if (interface && interface->fExtensions.has("GL_EXT_debug_tool")) {
interface.reset();
glXMakeCurrent(fDisplay, None, nullptr);
glXDestroyContext(fDisplay, fGLContext);
current = false;
fGLContext = nullptr;
}
}
if (fGLContext) {
break;
}
}
}
// Restore the original error handler
XSetErrorHandler(oldHandler);
}
if (!fGLContext) {
fGLContext = glXCreateContext(fDisplay, fVisualInfo, nullptr, GL_TRUE);
}
if (!fGLContext) {
return nullptr;
}
if (!current && !glXMakeCurrent(fDisplay, fWindow, fGLContext)) {
return nullptr;
}
const char* glxExtensions = glXQueryExtensionsString(fDisplay, DefaultScreen(fDisplay));
if (glxExtensions) {
if (strstr(glxExtensions, "GLX_EXT_swap_control")) {
PFNGLXSWAPINTERVALEXTPROC glXSwapIntervalEXT =
(PFNGLXSWAPINTERVALEXTPROC)glXGetProcAddressARB(
(const GLubyte*)"glXSwapIntervalEXT");
glXSwapIntervalEXT(fDisplay, fWindow, fDisplayParams.fDisableVsync ? 0 : 1);
}
}
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);
fSampleCount = std::max(fSampleCount, 1);
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);
return interface ? interface : GrGLMakeNativeInterface();
}
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 {
std::unique_ptr<WindowContext> MakeGLForXlib(const XlibWindowInfo& winInfo,
const DisplayParams& params) {
std::unique_ptr<WindowContext> ctx(new GLWindowContext_xlib(winInfo, params));
if (!ctx->isValid()) {
return nullptr;
}
return ctx;
}
} // namespace window_context_factory
} // namespace sk_app