blob: e6fae8ed7b2a7704494c7d5f14bb94a64c5fa80c [file] [log] [blame]
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gl/SkNativeGLContext.h"
#include <GL/glu.h>
#define GLX_1_3 1
SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
fOldGLXContext = glXGetCurrentContext();
fOldDisplay = glXGetCurrentDisplay();
fOldDrawable = glXGetCurrentDrawable();
}
SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
if (NULL != fOldDisplay) {
glXMakeCurrent(fOldDisplay, fOldDrawable, fOldGLXContext);
}
}
///////////////////////////////////////////////////////////////////////////////
static bool ctxErrorOccurred = false;
static int ctxErrorHandler(Display *dpy, XErrorEvent *ev) {
ctxErrorOccurred = true;
return 0;
}
SkNativeGLContext::SkNativeGLContext()
: fContext(NULL)
, fDisplay(NULL)
, fPixmap(0)
, fGlxPixmap(0) {
}
SkNativeGLContext::~SkNativeGLContext() {
this->destroyGLContext();
}
void SkNativeGLContext::destroyGLContext() {
if (fDisplay) {
glXMakeCurrent(fDisplay, 0, 0);
if (fContext) {
glXDestroyContext(fDisplay, fContext);
fContext = NULL;
}
if (fGlxPixmap) {
glXDestroyGLXPixmap(fDisplay, fGlxPixmap);
fGlxPixmap = 0;
}
if (fPixmap) {
XFreePixmap(fDisplay, fPixmap);
fPixmap = 0;
}
XCloseDisplay(fDisplay);
fDisplay = NULL;
}
}
const GrGLInterface* SkNativeGLContext::createGLContext() {
fDisplay = XOpenDisplay(0);
if (!fDisplay) {
SkDebugf("Failed to open X display.\n");
this->destroyGLContext();
return NULL;
}
// Get a matching FB config
static int visual_attribs[] = {
GLX_X_RENDERABLE , True,
GLX_DRAWABLE_TYPE , GLX_PIXMAP_BIT,
None
};
#ifdef GLX_1_3
//SkDebugf("Getting matching framebuffer configs.\n");
int fbcount;
GLXFBConfig *fbc = glXChooseFBConfig(fDisplay, DefaultScreen(fDisplay),
visual_attribs, &fbcount);
if (!fbc) {
SkDebugf("Failed to retrieve a framebuffer config.\n");
this->destroyGLContext();
return NULL;
}
//SkDebugf("Found %d matching FB configs.\n", fbcount);
// Pick the FB config/visual with the most samples per pixel
//SkDebugf("Getting XVisualInfos.\n");
int best_fbc = -1, best_num_samp = -1;
int i;
for (i = 0; i < fbcount; ++i) {
XVisualInfo *vi = glXGetVisualFromFBConfig(fDisplay, fbc[i]);
if (vi) {
int samp_buf, samples;
glXGetFBConfigAttrib(fDisplay, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf);
glXGetFBConfigAttrib(fDisplay, fbc[i], GLX_SAMPLES, &samples);
//SkDebugf(" Matching fbconfig %d, visual ID 0x%2x: SAMPLE_BUFFERS = %d,"
// " SAMPLES = %d\n",
// i, (unsigned int)vi->visualid, samp_buf, samples);
if (best_fbc < 0 || (samp_buf && samples > best_num_samp))
best_fbc = i, best_num_samp = samples;
}
XFree(vi);
}
GLXFBConfig bestFbc = fbc[best_fbc];
// Be sure to free the FBConfig list allocated by glXChooseFBConfig()
XFree(fbc);
// Get a visual
XVisualInfo *vi = glXGetVisualFromFBConfig(fDisplay, bestFbc);
//SkDebugf("Chosen visual ID = 0x%x\n", (unsigned int)vi->visualid);
#else
int numVisuals;
XVisualInfo visTemplate, *visReturn;
visReturn = XGetVisualInfo(fDisplay, VisualNoMask, &visTemplate, &numVisuals);
if (NULL == visReturn)
{
SkDebugf("Failed to get visual information.\n");
this->destroyGLContext();
return NULL;
}
int best = -1, best_num_samp = -1;
for (int i = 0; i < numVisuals; ++i)
{
int samp_buf, samples;
glXGetConfig(fDisplay, &visReturn[i], GLX_SAMPLE_BUFFERS, &samp_buf);
glXGetConfig(fDisplay, &visReturn[i], GLX_SAMPLES, &samples);
if (best < 0 || (samp_buf && samples > best_num_samp))
best = i, best_num_samp = samples;
}
XVisualInfo temp = visReturn[best];
XVisualInfo *vi = &temp;
XFree(visReturn);
#endif
fPixmap = XCreatePixmap(fDisplay, RootWindow(fDisplay, vi->screen), 10, 10, vi->depth);
if (!fPixmap) {
SkDebugf("Failed to create pixmap.\n");
this->destroyGLContext();
return NULL;
}
fGlxPixmap = glXCreateGLXPixmap(fDisplay, vi, fPixmap);
#ifdef GLX_1_3
// Done with the visual info data
XFree(vi);
#endif
// Create the context
// Install an X error handler so the application won't exit if GL 3.0
// context allocation fails.
//
// Note this error handler is global.
// All display connections in all threads of a process use the same
// error handler, so be sure to guard against other threads issuing
// X commands while this code is running.
ctxErrorOccurred = false;
int (*oldHandler)(Display*, XErrorEvent*) =
XSetErrorHandler(&ctxErrorHandler);
// Get the default screen's GLX extension list
const char *glxExts = glXQueryExtensionsString(
fDisplay, DefaultScreen(fDisplay)
);
// Check for the GLX_ARB_create_context extension string and the function.
// If either is not present, use GLX 1.3 context creation method.
if (!gluCheckExtension(
reinterpret_cast<const GLubyte*>("GLX_ARB_create_context")
, reinterpret_cast<const GLubyte*>(glxExts)))
{
//SkDebugf("GLX_ARB_create_context not found."
// " Using old-style GLX context.\n");
#ifdef GLX_1_3
fContext = glXCreateNewContext(fDisplay, bestFbc, GLX_RGBA_TYPE, 0, True);
#else
fContext = glXCreateContext(fDisplay, vi, 0, True);
#endif
}
#ifdef GLX_1_3
else {
//SkDebugf("Creating context.\n");
PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB =
(PFNGLXCREATECONTEXTATTRIBSARBPROC) glXGetProcAddressARB((GrGLubyte*)"glXCreateContextAttribsARB");
int context_attribs[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
GLX_CONTEXT_MINOR_VERSION_ARB, 0,
//GLX_CONTEXT_FLAGS_ARB , GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
None
};
fContext = glXCreateContextAttribsARB(
fDisplay, bestFbc, 0, True, context_attribs
);
// Sync to ensure any errors generated are processed.
XSync(fDisplay, False);
if (!ctxErrorOccurred && fContext) {
//SkDebugf( "Created GL 3.0 context.\n" );
} else {
// Couldn't create GL 3.0 context.
// Fall back to old-style 2.x context.
// When a context version below 3.0 is requested,
// implementations will return the newest context version compatible
// with OpenGL versions less than version 3.0.
// GLX_CONTEXT_MAJOR_VERSION_ARB = 1
context_attribs[1] = 1;
// GLX_CONTEXT_MINOR_VERSION_ARB = 0
context_attribs[3] = 0;
ctxErrorOccurred = false;
//SkDebugf("Failed to create GL 3.0 context."
// " Using old-style GLX context.\n");
fContext = glXCreateContextAttribsARB(
fDisplay, bestFbc, 0, True, context_attribs
);
}
}
#endif
// Sync to ensure any errors generated are processed.
XSync(fDisplay, False);
// Restore the original error handler
XSetErrorHandler(oldHandler);
if (ctxErrorOccurred || !fContext) {
SkDebugf("Failed to create an OpenGL context.\n");
this->destroyGLContext();
return NULL;
}
// Verify that context is a direct context
if (!glXIsDirect(fDisplay, fContext)) {
//SkDebugf("Indirect GLX rendering context obtained.\n");
} else {
//SkDebugf("Direct GLX rendering context obtained.\n");
}
//SkDebugf("Making context current.\n");
if (!glXMakeCurrent(fDisplay, fGlxPixmap, fContext)) {
SkDebugf("Could not set the context.\n");
this->destroyGLContext();
return NULL;
}
const GrGLInterface* interface = GrGLCreateNativeInterface();
if (!interface) {
SkDebugf("Failed to create gl interface");
this->destroyGLContext();
return NULL;
}
return interface;
}
void SkNativeGLContext::makeCurrent() const {
if (!glXMakeCurrent(fDisplay, fGlxPixmap, fContext)) {
SkDebugf("Could not set the context.\n");
}
}