blob: 9362bca740001c9a20204aae58a963f0159ac0ec [file] [log] [blame]
* GStreamer
* Copyright (C) 2015 Matthew Waters <>
* 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
* 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.
#include "config.h"
#include <Cocoa/Cocoa.h>
#include "gstglcaopengllayer.h"
#include "gstgl_cocoa_private.h"
@implementation GstGLCAOpenGLLayer
- (void)dealloc {
if (self->draw_notify)
self->draw_notify (self->draw_data);
if (self->draw_context)
gst_object_unref (self->draw_context);
GST_TRACE ("dealloc GstGLCAOpenGLLayer %p context %p", self, self->gst_gl_context);
[super dealloc];
static void
_context_ready (gpointer data)
GstGLCAOpenGLLayer *ca_layer = data;
g_atomic_int_set (&ca_layer->can_draw, 1);
- (id)initWithGstGLContext:(GstGLContextCocoa *)parent_gl_context {
[super init];
GST_LOG ("init CAOpenGLLayer");
self->gst_gl_context = parent_gl_context;
self.needsDisplayOnBoundsChange = YES;
gst_gl_window_send_message_async (GST_GL_CONTEXT (parent_gl_context)->window,
(GstGLWindowCB) _context_ready, self, NULL);
return self;
- (CGLPixelFormatObj)copyCGLPixelFormatForDisplayMask:(uint32_t)mask {
CGLPixelFormatObj fmt = NULL;
if (self->gst_gl_context)
fmt = gst_gl_context_cocoa_get_pixel_format (self->gst_gl_context);
if (!fmt) {
CGLPixelFormatAttribute attribs[] = {
kCGLPFAAccumSize, 32,
CGLError ret;
gint npix = 0;
GST_DEBUG ("creating new pixel format for CAOpenGLLayer %p", self);
ret = CGLChoosePixelFormat (attribs, &fmt, &npix);
if (ret != kCGLNoError) {
GST_ERROR ("CAOpenGLLayer cannot choose a pixel format: %s", CGLErrorString (ret));
return fmt;
- (CGLContextObj)copyCGLContextForPixelFormat:(CGLPixelFormatObj)pixelFormat {
GstGLDisplay *display;
CGLContextObj external_context = NULL;
CGLError ret;
GError *error = NULL;
if (self->gst_gl_context)
external_context = (CGLContextObj) gst_gl_context_get_gl_context (GST_GL_CONTEXT (self->gst_gl_context));
GST_INFO ("attempting to create CGLContext for CAOpenGLLayer with "
"share context %p", external_context);
ret = CGLCreateContext (pixelFormat, external_context, &self->gl_context);
if (ret != kCGLNoError) {
GST_ERROR ("failed to create CGL context in CAOpenGLLayer with share context %p: %s", external_context, CGLErrorString(ret));
return NULL;
if (self->draw_context)
gst_object_unref (self->draw_context);
if (kCGLNoError != CGLSetCurrentContext (self->gl_context)) {
GST_ERROR ("failed set cgl context %p current", self->gl_context);
return NULL;
display = gst_gl_context_get_display (GST_GL_CONTEXT (self->gst_gl_context));
self->draw_context = gst_gl_context_new_wrapped (display,
(guintptr) self->gl_context, GST_GL_PLATFORM_CGL,
gst_gl_context_get_current_gl_api (GST_GL_PLATFORM_CGL, NULL, NULL));
gst_object_unref (display);
if (!self->draw_context) {
GST_ERROR ("failed to create wrapped context");
return NULL;
gst_gl_context_activate (self->draw_context, TRUE);
if (!gst_gl_context_fill_info (self->draw_context, &error)) {
GST_ERROR ("failed to fill wrapped context information: %s", error->message);
return NULL;
gst_gl_context_activate (self->draw_context, FALSE);
return self->gl_context;
- (void)releaseCGLContext:(CGLContextObj)glContext {
CGLReleaseContext (glContext);
- (void)setDrawCallback:(GstGLWindowCB)cb data:(gpointer)data
notify:(GDestroyNotify)notify {
g_return_if_fail (cb);
if (self->draw_notify)
self->draw_notify (self->draw_data);
self->draw_cb = cb;
self->draw_data = data;
self->draw_notify = notify;
- (void)setResizeCallback:(GstGLWindowResizeCB)cb data:(gpointer)data
notify:(GDestroyNotify)notify {
if (self->resize_notify)
self->resize_notify (self->resize_notify);
self->resize_cb = cb;
self->resize_data = data;
self->resize_notify = notify;
- (BOOL)canDrawInCGLContext:(CGLContextObj)glContext
displayTime:(const CVTimeStamp *)timeStamp {
return g_atomic_int_get (&self->can_draw);
- (void)drawInCGLContext:(CGLContextObj)glContext
displayTime:(const CVTimeStamp *)timeStamp {
const GstGLFuncs *gl = ((GstGLContext *)self->gst_gl_context)->gl_vtable;
GstVideoRectangle src, dst, result;
gint ca_viewport[4];
GST_LOG ("CAOpenGLLayer drawing with cgl context %p", glContext);
/* attempt to get the correct viewport back due to CA being too smart
* and messing around with it so center the expected viewport into
* the CA viewport set up on entry to this function */
gl->GetIntegerv (GL_VIEWPORT, ca_viewport);
gst_gl_context_activate (self->draw_context, TRUE);
if (self->last_bounds.size.width != self.bounds.size.width
|| self->last_bounds.size.height != self.bounds.size.height) {
if (self->resize_cb) {
self->resize_cb (self->resize_data, self.bounds.size.width,
gl->GetIntegerv (GL_VIEWPORT, self->expected_dims);
} else {
/* default to whatever ca gives us */
self->expected_dims[0] = ca_viewport[0];
self->expected_dims[1] = ca_viewport[1];
self->expected_dims[2] = ca_viewport[2];
self->expected_dims[3] = ca_viewport[3];
self->last_bounds = self.bounds;
src.x = self->expected_dims[0];
src.y = self->expected_dims[1];
src.w = self->expected_dims[2];
src.h = self->expected_dims[3];
dst.x = ca_viewport[0];
dst.y = ca_viewport[1];
dst.w = ca_viewport[2];
dst.h = ca_viewport[3];
gst_video_sink_center_rect (src, dst, &result, TRUE);
gl->Viewport (result.x, result.y, result.w, result.h);
if (self->draw_cb)
self->draw_cb (self->draw_data);
gst_gl_context_activate (self->draw_context, FALSE);
/* flushes the buffer */
[super drawInCGLContext:glContext pixelFormat:pixelFormat forLayerTime:interval displayTime:timeStamp];