gstreamer/gst-libs/gst/gl/cocoa/gstglcontext_cocoa.m

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/*
* GStreamer
* Copyright (C) 2012 Matthew Waters <ystreet00@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <Cocoa/Cocoa.h>
#include "gstglcontext_cocoa.h"
#include "gstgl_cocoa_private.h"
static gboolean gst_gl_context_cocoa_create_context (GstGLContext *context, GstGLAPI gl_api,
GstGLContext * other_context, GError **error);
static void gst_gl_context_cocoa_destroy_context (GstGLContext *context);
static guintptr gst_gl_context_cocoa_get_gl_context (GstGLContext * window);
static gboolean gst_gl_context_cocoa_activate (GstGLContext * context, gboolean activate);
static GstGLAPI gst_gl_context_cocoa_get_gl_api (GstGLContext * context);
static GstGLPlatform gst_gl_context_cocoa_get_gl_platform (GstGLContext * context);
#define GST_GL_CONTEXT_COCOA_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE((o), GST_GL_TYPE_CONTEXT_COCOA, GstGLContextCocoaPrivate))
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GST_DEBUG_CATEGORY_STATIC (gst_gl_context_cocoa_debug);
#define GST_CAT_DEFAULT gst_gl_context_cocoa_debug
G_DEFINE_TYPE_WITH_CODE (GstGLContextCocoa, gst_gl_context_cocoa,
GST_GL_TYPE_CONTEXT, GST_DEBUG_CATEGORY_INIT (gst_gl_context_cocoa_debug, "glcontext_cocoa", 0, "Cocoa GL Context"); );
static void
gst_gl_context_cocoa_class_init (GstGLContextCocoaClass * klass)
{
GstGLContextClass *context_class = (GstGLContextClass *) klass;
g_type_class_add_private (klass, sizeof (GstGLContextCocoaPrivate));
context_class->destroy_context =
GST_DEBUG_FUNCPTR (gst_gl_context_cocoa_destroy_context);
context_class->create_context =
GST_DEBUG_FUNCPTR (gst_gl_context_cocoa_create_context);
context_class->get_gl_context =
GST_DEBUG_FUNCPTR (gst_gl_context_cocoa_get_gl_context);
context_class->activate = GST_DEBUG_FUNCPTR (gst_gl_context_cocoa_activate);
context_class->get_gl_api =
GST_DEBUG_FUNCPTR (gst_gl_context_cocoa_get_gl_api);
context_class->get_gl_platform =
GST_DEBUG_FUNCPTR (gst_gl_context_cocoa_get_gl_platform);
}
static void
gst_gl_context_cocoa_init (GstGLContextCocoa * context)
{
context->priv = GST_GL_CONTEXT_COCOA_GET_PRIVATE (context);
}
/* Must be called in the gl thread */
GstGLContextCocoa *
gst_gl_context_cocoa_new (GstGLDisplay * display)
{
if ((gst_gl_display_get_handle_type (display) & GST_GL_DISPLAY_TYPE_COCOA) == 0)
/* we require an cocoa display to create CGL contexts */
return NULL;
return g_object_new (GST_GL_TYPE_CONTEXT_COCOA, NULL);
}
struct pixel_attr
{
CGLPixelFormatAttribute attr;
const gchar *attr_name;
};
static struct pixel_attr pixel_attrs[] = {
{kCGLPFAAllRenderers, "All Renderers"},
{kCGLPFADoubleBuffer, "Double Buffered"},
{kCGLPFAAuxBuffers, "Aux Buffers"},
{kCGLPFAColorSize, "Color Size"},
{kCGLPFAAlphaSize, "Alpha Size"},
{kCGLPFADepthSize, "Depth Size"},
{kCGLPFAStencilSize, "Stencil Size"},
{kCGLPFAAccumSize, "Accum Size"},
{kCGLPFAMinimumPolicy, "Minimum Policy"},
{kCGLPFAMaximumPolicy, "Maximum Policy"},
{kCGLPFASampleBuffers, "Sample Buffers"},
{kCGLPFASamples, "Samples"},
{kCGLPFAAuxDepthStencil, "Aux Depth Stencil"},
{kCGLPFAColorFloat, "Color Float"},
{kCGLPFAMultisample, "Multisample"},
{kCGLPFASupersample, "Supersample"},
{kCGLPFARendererID, "Renderer ID"},
{kCGLPFANoRecovery, "No Recovery"},
{kCGLPFAAccelerated, "Accelerated"},
{kCGLPFAClosestPolicy, "Closest Policy"},
{kCGLPFABackingStore, "Backing Store"},
{kCGLPFADisplayMask, "Display Mask"},
{kCGLPFAAllowOfflineRenderers, "Allow Offline Renderers"},
{kCGLPFAAcceleratedCompute, "Accelerated Compute"},
{kCGLPFAOpenGLProfile, "OpenGL Profile"},
{kCGLPFAVirtualScreenCount, "Virtual Screen Count"},
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_11
{kCGLPFAStereo, "Stereo"},
#endif
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_9
{kCGLPFACompliant, "Compliant"},
{kCGLPFARemotePBuffer, "Remote PBuffer"},
{kCGLPFASingleRenderer, "Single Renderer"},
{kCGLPFAWindow, "Window"},
#endif
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
// {kCGLPFAOffScreen, "Off Screen"},
// {kCGLPFAPBuffer, "PBuffer"},
#endif
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
// {kCGLPFAFullScreen, "Full Screen"},
#endif
#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_5
// {kCGLPFAMPSafe, "MP Safe"},
// {kCGLPFAMultiScreen, "Multi Screen"},
// {kCGLPFARobust, "Robust"},
#endif
};
void
gst_gl_context_cocoa_dump_pixel_format (CGLPixelFormatObj fmt)
{
int i;
for (i = 0; i < G_N_ELEMENTS (pixel_attrs); i++) {
gint val;
CGLError ret = CGLDescribePixelFormat (fmt, 0, pixel_attrs[i].attr, &val);
if (ret != kCGLNoError) {
GST_WARNING ("failed to get pixel format %p attribute %s", fmt, pixel_attrs[i].attr_name);
} else {
GST_DEBUG ("Pixel format %p attr %s = %i", fmt, pixel_attrs[i].attr_name,
val);
}
}
}
CGLPixelFormatObj
gst_gl_context_cocoa_get_pixel_format (GstGLContextCocoa *context)
{
return context->priv->pixel_format;
}
static gboolean
gst_gl_context_cocoa_create_context (GstGLContext *context, GstGLAPI gl_api,
GstGLContext *other_context, GError **error)
{
GstGLContextCocoa *context_cocoa = GST_GL_CONTEXT_COCOA (context);
GstGLContextCocoaPrivate *priv = context_cocoa->priv;
GstGLWindow *window = gst_gl_context_get_window (context);
GstGLWindowCocoa *window_cocoa = GST_GL_WINDOW_COCOA (window);
GstGLAPI context_api = GST_GL_API_NONE;
const GLint swapInterval = 1;
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
CGLPixelFormatObj fmt = NULL;
CGLContextObj glContext;
CGLPixelFormatAttribute attribs[] = {
kCGLPFADoubleBuffer,
kCGLPFAAccumSize, 32,
0
};
CGLError ret;
gint pix_fmt_i = 0;
gint npix;
if ((gl_api & (GST_GL_API_OPENGL | GST_GL_API_OPENGL3)) == GST_GL_API_NONE) {
g_set_error (error, GST_GL_CONTEXT_ERROR,
GST_GL_CONTEXT_ERROR_CREATE_CONTEXT,
"The CGL backend only supports GL and GL3");
goto error;
}
priv->gl_context = nil;
if (other_context)
priv->external_gl_context = (CGLContextObj) gst_gl_context_get_gl_context (other_context);
else
priv->external_gl_context = NULL;
if (priv->external_gl_context) {
gint profile;
fmt = CGLGetPixelFormat (priv->external_gl_context);
#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
/* core profile is only available in >= 10.7 */
if (kCGLNoError == CGLDescribePixelFormat (fmt, 0, kCGLPFAOpenGLProfile,
&profile)) {
if (profile == kCGLOGLPVersion_3_2_Core) {
context_api = GST_GL_API_OPENGL3;
} else {
context_api =GST_GL_API_OPENGL;
}
}
#else
context_api = GST_GL_API_OPENGL;
#endif
}
if (!fmt) {
#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
if (gl_api & GST_GL_API_OPENGL3) {
attribs[pix_fmt_i++] = kCGLPFAOpenGLProfile;
attribs[pix_fmt_i++] = (int) kCGLOGLPVersion_3_2_Core;
context_api = GST_GL_API_OPENGL3;
} else {
context_api = GST_GL_API_OPENGL;
}
#else
context_api = GST_GL_API_OPENGL;
#endif
attribs[pix_fmt_i++] = 0;
ret = CGLChoosePixelFormat (attribs, &fmt, &npix);
if (ret != kCGLNoError) {
g_set_error (error, GST_GL_CONTEXT_ERROR,
GST_GL_CONTEXT_ERROR_WRONG_CONFIG, "cannot choose a pixel format: %s", CGLErrorString (ret));
goto error;
}
}
gst_gl_context_cocoa_dump_pixel_format (fmt);
ret = CGLCreateContext (fmt, priv->external_gl_context, &glContext);
if (ret != kCGLNoError) {
g_set_error (error, GST_GL_CONTEXT_ERROR, GST_GL_CONTEXT_ERROR_CREATE_CONTEXT,
"failed to create context: %s", CGLErrorString (ret));
goto error;
}
context_cocoa->priv->pixel_format = fmt;
context_cocoa->priv->gl_context = glContext;
_invoke_on_main ((GstGLWindowCB) gst_gl_window_cocoa_create_window,
window_cocoa);
if (!context_cocoa->priv->gl_context) {
goto error;
}
GST_INFO_OBJECT (context, "GL context created: %p", context_cocoa->priv->gl_context);
CGLSetCurrentContext (context_cocoa->priv->gl_context);
/* Back and front buffers are swapped only during the vertical retrace of the monitor.
* Discarded if you configured your driver to Never-use-V-Sync.
*/
CGLSetParameter (context_cocoa->priv->gl_context, kCGLCPSwapInterval, &swapInterval);
context_cocoa->priv->context_api = context_api;
if (window)
gst_object_unref (window);
[pool release];
return TRUE;
error:
{
if (window)
gst_object_unref (window);
[pool release];
return FALSE;
}
}
static void
gst_gl_context_cocoa_destroy_context (GstGLContext *context)
{
/* FIXME: Need to release context and other things? */
}
static guintptr
gst_gl_context_cocoa_get_gl_context (GstGLContext * context)
{
return (guintptr) GST_GL_CONTEXT_COCOA (context)->priv->gl_context;
}
static gboolean
gst_gl_context_cocoa_activate (GstGLContext * context, gboolean activate)
{
GstGLContextCocoa *context_cocoa = GST_GL_CONTEXT_COCOA (context);
gpointer context_handle = activate ? context_cocoa->priv->gl_context : NULL;
return kCGLNoError == CGLSetCurrentContext (context_handle);
}
static GstGLAPI
gst_gl_context_cocoa_get_gl_api (GstGLContext * context)
{
GstGLContextCocoa *context_cocoa = GST_GL_CONTEXT_COCOA (context);
if (context_cocoa->priv->gl_context)
return context_cocoa->priv->context_api;
return GST_GL_API_OPENGL | GST_GL_API_OPENGL3;
}
static GstGLPlatform
gst_gl_context_cocoa_get_gl_platform (GstGLContext * context)
{
return GST_GL_PLATFORM_CGL;
}
guintptr
gst_gl_context_cocoa_get_current_context (void)
{
return (guintptr) CGLGetCurrentContext ();
}