gstreamer/gst-libs/gst/gl/cocoa/gstglcaopengllayer.m
Matthew Waters 6a37bf9bb9 gl: Don't restore the viewport on function exit
Doing so involves retrieving the current viewport from OpenGL which as
with any glGet operation, is expensive.

This means that the various sinks need to reset the viewport on draw.

In the process, fix resizing on cocoa.
2019-03-08 17:49:05 +11:00

260 lines
7.8 KiB
Objective-C

/*
* GStreamer
* Copyright (C) 2015 Matthew Waters <matthew@centricular.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 "gstglcaopengllayer.h"
#include "gstgl_cocoa_private.h"
#define GST_CAT_DEFAULT gst_gl_ca_opengl_layer_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static void
_init_debug (void)
{
static volatile gsize _init = 0;
if (g_once_init_enter (&_init)) {
GST_DEBUG_CATEGORY_INIT(gst_gl_ca_opengl_layer_debug, "glcaopengllayer",
0, "CAOpenGLLayer");
g_once_init_leave (&_init, 1);
}
}
@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);
}
static void
_context_ready (gpointer data)
{
GstGLCAOpenGLLayer *ca_layer = (__bridge GstGLCAOpenGLLayer *) data;
g_atomic_int_set (&ca_layer->can_draw, 1);
}
- (id)initWithGstGLContext:(GstGLContext *)parent_gl_context {
g_return_val_if_fail (GST_IS_GL_CONTEXT_COCOA (parent_gl_context), nil);
self = [super init];
_init_debug();
GST_LOG ("init CAOpenGLLayer");
self->gst_gl_context = parent_gl_context;
self.needsDisplayOnBoundsChange = YES;
gst_gl_window_send_message_async (parent_gl_context->window,
(GstGLWindowCB) _context_ready, (__bridge_retained gpointer)self, (GDestroyNotify)CFRelease);
return self;
}
- (CGLPixelFormatObj)copyCGLPixelFormatForDisplayMask:(uint32_t)mask {
CGLPixelFormatObj fmt = NULL;
if (self->gst_gl_context)
fmt = gst_gl_context_cocoa_get_pixel_format (GST_GL_CONTEXT_COCOA (self->gst_gl_context));
if (!fmt) {
CGLPixelFormatAttribute attribs[] = {
kCGLPFADoubleBuffer,
kCGLPFAAccumSize, 32,
0
};
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 (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 (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);
gst_gl_context_set_shared_with (self->draw_context, self->gst_gl_context);
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)queueResize {
self->queue_resize = TRUE;
}
- (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_data);
self->resize_cb = cb;
self->resize_data = data;
self->resize_notify = notify;
}
- (BOOL)canDrawInCGLContext:(CGLContextObj)glContext
pixelFormat:(CGLPixelFormatObj)pixelFormat
forLayerTime:(CFTimeInterval)interval
displayTime:(const CVTimeStamp *)timeStamp {
return g_atomic_int_get (&self->can_draw);
}
- (void)drawInCGLContext:(CGLContextObj)glContext
pixelFormat:(CGLPixelFormatObj)pixelFormat
forLayerTime:(CFTimeInterval)interval
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_TRACE ("retrieved viewport from CA %u,%u %ux%u", self->expected_dims[0],
self->expected_dims[1], self->expected_dims[2], self->expected_dims[3]);
gst_gl_context_activate (self->draw_context, TRUE);
if (self->queue_resize || 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*self.contentsScale,
self.bounds.size.height*self.contentsScale);
gl->GetIntegerv (GL_VIEWPORT, self->expected_dims);
GST_LOG ("resize callback wants viewport %u,%u %ux%u",
self->expected_dims[0], self->expected_dims[1],
self->expected_dims[2], self->expected_dims[3]);
} 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;
self->queue_resize = FALSE;
}
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);
GST_TRACE ("Using viewport %u,%u %ux%u", result.x, result.y, result.w,
result.h);
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];
}
@end