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gstreamer/gst-libs/gst/gl/gstglutils.c
Matthew Waters 775ba4ff0b glutils: only attempt getting the app context when we don't already have a display 
avoids querying/messaging the world on each frame
2014-11-06 18:47:34 +11:00

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/*
* GStreamer
* Copyright (C) 2013 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 <stdio.h>
#include <gst/gst.h>
#include "gl.h"
#include "gstglutils.h"
#if GST_GL_HAVE_WINDOW_X11
#include <gst/gl/x11/gstgldisplay_x11.h>
#endif
#ifndef GL_FRAMEBUFFER_UNDEFINED
#define GL_FRAMEBUFFER_UNDEFINED 0x8219
#endif
#ifndef GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT
#define GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT 0x8CD6
#endif
#ifndef GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT
#define GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT 0x8CD7
#endif
#ifndef GL_FRAMEBUFFER_UNSUPPORTED
#define GL_FRAMEBUFFER_UNSUPPORTED 0x8CDD
#endif
#ifndef GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS
#define GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS 0x8CD9
#endif
#define USING_OPENGL(context) (gst_gl_context_check_gl_version (context, GST_GL_API_OPENGL, 1, 0))
#define USING_OPENGL3(context) (gst_gl_context_check_gl_version (context, GST_GL_API_OPENGL3, 3, 1))
#define USING_GLES(context) (gst_gl_context_check_gl_version (context, GST_GL_API_GLES, 1, 0))
#define USING_GLES2(context) (gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 2, 0))
#define USING_GLES3(context) (gst_gl_context_check_gl_version (context, GST_GL_API_GLES2, 3, 0))
static gchar *error_message;
/* called in the gl thread */
gboolean
gst_gl_context_check_framebuffer_status (GstGLContext * context)
{
GLenum status = 0;
status = context->gl_vtable->CheckFramebufferStatus (GL_FRAMEBUFFER);
switch (status) {
case GL_FRAMEBUFFER_COMPLETE:
return TRUE;
break;
case GL_FRAMEBUFFER_UNSUPPORTED:
GST_ERROR ("GL_FRAMEBUFFER_UNSUPPORTED");
break;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
GST_ERROR ("GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT");
break;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
GST_ERROR ("GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT");
break;
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
GST_ERROR ("GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS");
break;
#if GST_GL_HAVE_OPENGL
case GL_FRAMEBUFFER_UNDEFINED:
GST_ERROR ("GL_FRAMEBUFFER_UNDEFINED");
break;
#endif
default:
GST_ERROR ("General FBO error");
}
return FALSE;
}
typedef struct _GenTexture
{
guint width, height;
GstVideoFormat format;
guint result;
} GenTexture;
static void
_gen_texture (GstGLContext * context, GenTexture * data)
{
const GstGLFuncs *gl = context->gl_vtable;
GST_TRACE ("Generating texture format:%u dimensions:%ux%u", data->format,
data->width, data->height);
gl->GenTextures (1, &data->result);
gl->BindTexture (GL_TEXTURE_2D, data->result);
if (data->width > 0 && data->height > 0)
gl->TexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8, data->width,
data->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
GST_LOG ("generated texture id:%d", data->result);
}
void
gst_gl_context_gen_texture (GstGLContext * context, GLuint * pTexture,
GstVideoFormat v_format, GLint width, GLint height)
{
GenTexture data = { width, height, v_format, 0 };
gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _gen_texture,
&data);
*pTexture = data.result;
}
static void
_del_texture (GstGLContext * context, guint * texture)
{
context->gl_vtable->DeleteTextures (1, texture);
}
void
gst_gl_context_del_texture (GstGLContext * context, GLuint * pTexture)
{
gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _del_texture,
pTexture);
}
typedef struct _GenTextureFull
{
const GstVideoInfo *info;
const gint comp;
guint result;
} GenTextureFull;
static void
_gen_texture_full (GstGLContext * context, GenTextureFull * data)
{
const GstGLFuncs *gl = context->gl_vtable;
GLint glinternalformat = 0;
GLenum glformat = 0;
GLenum gltype = 0;
gl->GenTextures (1, &data->result);
gl->BindTexture (GL_TEXTURE_2D, data->result);
switch (GST_VIDEO_INFO_FORMAT (data->info)) {
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
{
glinternalformat = GL_RGB8;
glformat = GL_RGB;
gltype = GL_UNSIGNED_BYTE;
break;
}
case GST_VIDEO_FORMAT_RGB16:
{
glinternalformat = GL_RGB16;
glformat = GL_RGB;
gltype = GL_UNSIGNED_SHORT_5_6_5;
break;
}
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_AYUV:
{
glinternalformat = GL_RGBA8;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
break;
}
case GST_VIDEO_FORMAT_NV12:
case GST_VIDEO_FORMAT_NV21:
{
glinternalformat = GL_LUMINANCE;
glformat = data->comp == 0 ? GL_LUMINANCE : GL_LUMINANCE_ALPHA;
gltype = GL_UNSIGNED_BYTE;
break;
}
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
case GST_VIDEO_FORMAT_Y444:
case GST_VIDEO_FORMAT_Y42B:
case GST_VIDEO_FORMAT_Y41B:
{
glformat = GL_LUMINANCE;
gltype = GL_UNSIGNED_BYTE;
break;
}
default:
GST_WARNING ("unsupported %s",
gst_video_format_to_string (GST_VIDEO_INFO_FORMAT (data->info)));
break;
}
gl->TexImage2D (GL_TEXTURE_2D, 0, glinternalformat,
GST_VIDEO_INFO_COMP_WIDTH (data->info, data->comp),
GST_VIDEO_INFO_COMP_HEIGHT (data->info, data->comp), 0, glformat, gltype,
NULL);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl->TexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
void
gst_gl_generate_texture_full (GstGLContext * context, const GstVideoInfo * info,
const guint comp, gint stride[], gsize offset[], gsize size[],
GLuint * pTexture)
{
GenTextureFull data = { info, comp, 0 };
switch (GST_VIDEO_INFO_FORMAT (info)) {
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
{
stride[0] = GST_ROUND_UP_4 (GST_VIDEO_INFO_WIDTH (info) * 3);
offset[0] = 0;
size[0] = stride[0] * GST_VIDEO_INFO_HEIGHT (info);
break;
}
case GST_VIDEO_FORMAT_RGB16:
{
stride[0] = GST_ROUND_UP_4 (GST_VIDEO_INFO_WIDTH (info) * 2);
offset[0] = 0;
size[0] = stride[0] * GST_VIDEO_INFO_HEIGHT (info);
break;
}
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_AYUV:
{
stride[0] = GST_ROUND_UP_4 (GST_VIDEO_INFO_WIDTH (info) * 4);
offset[0] = 0;
size[0] = stride[0] * GST_VIDEO_INFO_HEIGHT (info);
break;
}
case GST_VIDEO_FORMAT_NV12:
case GST_VIDEO_FORMAT_NV21:
{
size[comp] = stride[comp] * GST_VIDEO_INFO_COMP_HEIGHT (info, comp);
if (comp == 0) {
stride[0] = GST_ROUND_UP_4 (GST_VIDEO_INFO_COMP_WIDTH (info, 1));
offset[0] = 0;
} else {
stride[1] = GST_ROUND_UP_4 (GST_VIDEO_INFO_COMP_WIDTH (info, 1) * 2);
offset[1] = size[0];
}
break;
}
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
case GST_VIDEO_FORMAT_Y444:
case GST_VIDEO_FORMAT_Y42B:
case GST_VIDEO_FORMAT_Y41B:
{
stride[comp] = GST_ROUND_UP_4 (GST_VIDEO_INFO_COMP_WIDTH (info, comp));;
size[comp] = stride[comp] * GST_VIDEO_INFO_COMP_HEIGHT (info, comp);
if (comp == 0)
offset[0] = 0;
else if (comp == 1)
offset[1] = size[0];
else
offset[2] = offset[1] + size[1];
break;
}
default:
GST_WARNING ("unsupported %s",
gst_video_format_to_string (GST_VIDEO_INFO_FORMAT (info)));
break;
}
gst_gl_context_thread_add (context,
(GstGLContextThreadFunc) _gen_texture_full, &data);
*pTexture = data.result;
}
typedef struct _GenFBO
{
GstGLFramebuffer *frame;
gint width, height;
GLuint *fbo, *depth;
} GenFBO;
static void
_gen_fbo (GstGLContext * context, GenFBO * data)
{
gst_gl_framebuffer_generate (data->frame, data->width, data->height,
data->fbo, data->depth);
}
gboolean
gst_gl_context_gen_fbo (GstGLContext * context, gint width, gint height,
GLuint * fbo, GLuint * depthbuffer)
{
GstGLFramebuffer *frame = gst_gl_framebuffer_new (context);
GenFBO data = { frame, width, height, fbo, depthbuffer };
gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _gen_fbo, &data);
gst_object_unref (frame);
return TRUE;
}
typedef struct _UseFBO
{
GstGLFramebuffer *frame;
gint texture_fbo_width;
gint texture_fbo_height;
GLuint fbo;
GLuint depth_buffer;
GLuint texture_fbo;
GLCB cb;
gint input_tex_width;
gint input_tex_height;
GLuint input_tex;
gdouble proj_param1;
gdouble proj_param2;
gdouble proj_param3;
gdouble proj_param4;
GstGLDisplayProjection projection;
gpointer stuff;
} UseFBO;
static void
_use_fbo (GstGLContext * context, UseFBO * data)
{
gst_gl_framebuffer_use (data->frame, data->texture_fbo_width,
data->texture_fbo_height, data->fbo, data->depth_buffer,
data->texture_fbo, data->cb, data->input_tex_width,
data->input_tex_height, data->input_tex, data->proj_param1,
data->proj_param2, data->proj_param3, data->proj_param4, data->projection,
data->stuff);
}
/* Called by glfilter */
/* this function really has to be simplified... do we really need to
set projection this way? Wouldn't be better a set_projection
separate call? or just make glut functions available out of
gst-libs and call it if needed on drawcallback? -- Filippo */
/* GLCB too.. I think that only needed parameters should be
* GstGLDisplay *display and gpointer data, or just gpointer data */
/* ..everything here has to be simplified! */
gboolean
gst_gl_context_use_fbo (GstGLContext * context, gint texture_fbo_width,
gint texture_fbo_height, GLuint fbo, GLuint depth_buffer,
GLuint texture_fbo, GLCB cb, gint input_tex_width,
gint input_tex_height, GLuint input_tex, gdouble proj_param1,
gdouble proj_param2, gdouble proj_param3, gdouble proj_param4,
GstGLDisplayProjection projection, gpointer stuff)
{
GstGLFramebuffer *frame = gst_gl_framebuffer_new (context);
UseFBO data =
{ frame, texture_fbo_width, texture_fbo_height, fbo, depth_buffer,
texture_fbo, cb, input_tex_width, input_tex_height, input_tex,
proj_param1, proj_param2, proj_param3, proj_param4, projection, stuff
};
gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _use_fbo, &data);
gst_object_unref (frame);
return TRUE;
}
typedef struct _UseFBO2
{
GstGLFramebuffer *frame;
gint texture_fbo_width;
gint texture_fbo_height;
GLuint fbo;
GLuint depth_buffer;
GLuint texture_fbo;
GLCB_V2 cb;
gpointer stuff;
} UseFBO2;
static void
_use_fbo_v2 (GstGLContext * context, UseFBO2 * data)
{
gst_gl_framebuffer_use_v2 (data->frame, data->texture_fbo_width,
data->texture_fbo_height, data->fbo, data->depth_buffer,
data->texture_fbo, data->cb, data->stuff);
}
gboolean
gst_gl_context_use_fbo_v2 (GstGLContext * context, gint texture_fbo_width,
gint texture_fbo_height, GLuint fbo, GLuint depth_buffer,
GLuint texture_fbo, GLCB_V2 cb, gpointer stuff)
{
GstGLFramebuffer *frame = gst_gl_framebuffer_new (context);
UseFBO2 data =
{ frame, texture_fbo_width, texture_fbo_height, fbo, depth_buffer,
texture_fbo, cb, stuff
};
gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _use_fbo_v2,
&data);
gst_object_unref (frame);
return TRUE;
}
typedef struct _DelFBO
{
GstGLFramebuffer *frame;
GLuint fbo;
GLuint depth;
} DelFBO;
/* Called in the gl thread */
static void
_del_fbo (GstGLContext * context, DelFBO * data)
{
gst_gl_framebuffer_delete (data->frame, data->fbo, data->depth);
}
/* Called by gltestsrc and glfilter */
void
gst_gl_context_del_fbo (GstGLContext * context, GLuint fbo, GLuint depth_buffer)
{
GstGLFramebuffer *frame = gst_gl_framebuffer_new (context);
DelFBO data = { frame, fbo, depth_buffer };
gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _del_fbo, &data);
gst_object_unref (frame);
}
static void
_compile_shader (GstGLContext * context, GstGLShader ** shader)
{
GError *error = NULL;
gst_gl_shader_compile (*shader, &error);
if (error) {
gst_gl_context_set_error (context, "%s", error->message);
g_error_free (error);
error = NULL;
gst_gl_context_clear_shader (context);
gst_object_unref (*shader);
*shader = NULL;
}
}
/* Called by glfilter */
gboolean
gst_gl_context_gen_shader (GstGLContext * context, const gchar * vert_src,
const gchar * frag_src, GstGLShader ** shader)
{
g_return_val_if_fail (frag_src != NULL || vert_src != NULL, FALSE);
g_return_val_if_fail (shader != NULL, FALSE);
*shader = gst_gl_shader_new (context);
if (frag_src)
gst_gl_shader_set_fragment_source (*shader, frag_src);
if (vert_src)
gst_gl_shader_set_vertex_source (*shader, vert_src);
gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _compile_shader,
shader);
return *shader != NULL;
}
void
gst_gl_context_set_error (GstGLContext * context, const char *format, ...)
{
va_list args;
if (error_message)
g_free (error_message);
va_start (args, format);
error_message = g_strdup_vprintf (format, args);
va_end (args);
GST_WARNING ("%s", error_message);
}
gchar *
gst_gl_context_get_error (void)
{
return error_message;
}
/* Called by glfilter */
void
gst_gl_context_del_shader (GstGLContext * context, GstGLShader * shader)
{
gst_object_unref (shader);
}
static gboolean
gst_gl_display_found (GstElement * element, GstGLDisplay * display)
{
if (display) {
GST_LOG_OBJECT (element, "already have a display (%p)", display);
return TRUE;
}
return FALSE;
}
GST_DEBUG_CATEGORY_STATIC (GST_CAT_CONTEXT);
static gboolean
context_pad_query (const GValue * item, GValue * value, gpointer user_data)
{
GstPad *pad = g_value_get_object (item);
GstQuery *query = user_data;
gboolean res;
res = gst_pad_peer_query (pad, query);
if (res) {
g_value_set_boolean (value, TRUE);
return FALSE;
}
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, pad, "context pad peer query failed");
return TRUE;
}
static gboolean
run_context_query (GstElement * element, GstQuery * query,
GstPadDirection direction)
{
GstIterator *it;
GstIteratorFoldFunction func = context_pad_query;
GValue res = { 0 };
g_value_init (&res, G_TYPE_BOOLEAN);
g_value_set_boolean (&res, FALSE);
/* Ask neighbor */
if (direction == GST_PAD_SRC)
it = gst_element_iterate_src_pads (element);
else
it = gst_element_iterate_sink_pads (element);
while (gst_iterator_fold (it, func, &res, query) == GST_ITERATOR_RESYNC)
gst_iterator_resync (it);
gst_iterator_free (it);
return g_value_get_boolean (&res);
}
static GstQuery *
_gst_context_query (GstElement * element,
gpointer ptr, const gchar * display_type)
{
GstQuery *query;
GstContext *ctxt;
/* 2a) Query downstream with GST_QUERY_CONTEXT for the context and
* check if downstream already has a context of the specific type
* 2b) Query upstream as above.
*/
query = gst_query_new_context (display_type);
if (run_context_query (element, query, GST_PAD_SRC)) {
gst_query_parse_context (query, &ctxt);
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"found context (%p) in downstream query", ctxt);
} else if (run_context_query (element, query, GST_PAD_SINK)) {
gst_query_parse_context (query, &ctxt);
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"found context (%p) in upstream query", ctxt);
} else {
/* 3) Post a GST_MESSAGE_NEED_CONTEXT message on the bus with
* the required context type and afterwards check if a
* usable context was set now as in 1). The message could
* be handled by the parent bins of the element and the
* application.
*/
GstMessage *msg;
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"posting need context message");
msg = gst_message_new_need_context (GST_OBJECT_CAST (element),
display_type);
gst_element_post_message (element, msg);
}
/*
* Whomever responds to the need-context message performs a
* GstElement::set_context() with the required context in which the element
* is required to update the display_ptr or call gst_gl_handle_set_context().
*/
return query;
}
static void
gst_gl_display_context_query (GstElement * element, GstGLDisplay ** display_ptr)
{
GstContext *ctxt;
GstQuery *query;
#ifndef GST_DISABLE_GST_DEBUG
if (!GST_CAT_CONTEXT)
GST_DEBUG_CATEGORY_GET (GST_CAT_CONTEXT, "GST_CONTEXT");
#endif
query =
_gst_context_query (element, display_ptr, GST_GL_DISPLAY_CONTEXT_TYPE);
gst_query_parse_context (query, &ctxt);
if (ctxt && gst_context_has_context_type (ctxt, GST_GL_DISPLAY_CONTEXT_TYPE))
gst_context_get_gl_display (ctxt, display_ptr);
if (*display_ptr)
goto out;
#if GST_GL_HAVE_WINDOW_X11
gst_query_unref (query);
query = _gst_context_query (element, display_ptr, "gst.x11.display.handle");
gst_query_parse_context (query, &ctxt);
if (ctxt && gst_context_has_context_type (ctxt, "gst.x11.display.handle")) {
const GstStructure *s;
Display *display;
s = gst_context_get_structure (ctxt);
if (gst_structure_get (s, "display", G_TYPE_POINTER, &display, NULL)
&& display) {
*display_ptr =
(GstGLDisplay *) gst_gl_display_x11_new_with_display (display);
}
}
if (*display_ptr)
goto out;
#endif
out:
gst_query_unref (query);
}
static void
gst_gl_context_query (GstElement * element, GstGLContext ** context_ptr)
{
GstContext *ctxt;
GstQuery *query;
#ifndef GST_DISABLE_GST_DEBUG
if (!GST_CAT_CONTEXT)
GST_DEBUG_CATEGORY_GET (GST_CAT_CONTEXT, "GST_CONTEXT");
#endif
query = _gst_context_query (element, context_ptr, "gst.gl.app_context");
gst_query_parse_context (query, &ctxt);
if (ctxt && gst_context_has_context_type (ctxt, "gst.gl.app_context")) {
const GstStructure *s = gst_context_get_structure (ctxt);
gst_structure_get (s, "context", GST_GL_TYPE_CONTEXT, context_ptr, NULL);
}
gst_query_unref (query);
}
/* 4) Create a context by itself and post a GST_MESSAGE_HAVE_CONTEXT
* message.
*/
static void
gst_gl_display_context_propagate (GstElement * element, GstGLDisplay * display)
{
GstContext *context;
GstMessage *msg;
if (!display) {
GST_ERROR_OBJECT (element, "Could not get GL display connection");
return;
}
context = gst_context_new (GST_GL_DISPLAY_CONTEXT_TYPE, TRUE);
gst_context_set_gl_display (context, display);
GST_CAT_INFO_OBJECT (GST_CAT_CONTEXT, element,
"posting have context (%p) message with display (%p)", context, display);
msg = gst_message_new_have_context (GST_OBJECT_CAST (element), context);
gst_element_post_message (GST_ELEMENT_CAST (element), msg);
}
gboolean
gst_gl_ensure_element_data (gpointer element, GstGLDisplay ** display_ptr,
GstGLContext ** context_ptr)
{
GstGLDisplay *display;
g_return_val_if_fail (element != NULL, FALSE);
g_return_val_if_fail (display_ptr != NULL, FALSE);
g_return_val_if_fail (context_ptr != NULL, FALSE);
/* 1) Check if the element already has a context of the specific
* type.
*/
display = *display_ptr;
if (gst_gl_display_found (element, display))
goto done;
gst_gl_display_context_query (element, display_ptr);
/* Neighbour found and it updated the display */
if (gst_gl_display_found (element, *display_ptr))
goto get_gl_context;
/* If no neighboor, or application not interested, use system default */
display = gst_gl_display_new ();
*display_ptr = display;
gst_gl_display_context_propagate (element, display);
get_gl_context:
if (*context_ptr)
goto done;
gst_gl_context_query (element, context_ptr);
done:
return *display_ptr != NULL;
}
gboolean
gst_gl_handle_set_context (GstElement * element, GstContext * context,
GstGLDisplay ** display, GstGLContext ** other_context)
{
GstGLDisplay *display_replacement = NULL;
GstGLContext *context_replacement = NULL;
const gchar *context_type;
g_return_val_if_fail (display != NULL, FALSE);
g_return_val_if_fail (other_context != NULL, FALSE);
if (!context)
return FALSE;
context_type = gst_context_get_context_type (context);
if (g_strcmp0 (context_type, GST_GL_DISPLAY_CONTEXT_TYPE) == 0) {
if (!gst_context_get_gl_display (context, &display_replacement)) {
GST_WARNING_OBJECT (element, "Failed to get display from context");
return FALSE;
}
}
#if GST_GL_HAVE_WINDOW_X11
else if (g_strcmp0 (context_type, "gst.x11.display.handle") == 0) {
const GstStructure *s;
Display *display;
s = gst_context_get_structure (context);
if (gst_structure_get (s, "display", G_TYPE_POINTER, &display, NULL))
display_replacement =
(GstGLDisplay *) gst_gl_display_x11_new_with_display (display);
}
#endif
else if (g_strcmp0 (context_type, "gst.gl.app_context") == 0) {
const GstStructure *s = gst_context_get_structure (context);
GstGLDisplay *context_display;
GstGLDisplay *element_display;
if (gst_structure_get (s, "context", GST_GL_TYPE_CONTEXT,
&context_replacement, NULL)) {
context_display = gst_gl_context_get_display (context_replacement);
element_display = display_replacement ? display_replacement : *display;
if (element_display
&& (gst_gl_display_get_handle_type (element_display) &
gst_gl_display_get_handle_type (context_display)) == 0) {
GST_ELEMENT_WARNING (element, LIBRARY, SETTINGS, ("%s",
"Cannot set a GL context with a different display type"), ("%s",
"Cannot set a GL context with a different display type"));
gst_object_unref (context_replacement);
context_replacement = NULL;
}
gst_object_unref (context_display);
}
}
if (display_replacement) {
GstGLDisplay *old = *display;
*display = display_replacement;
if (old)
gst_object_unref (old);
}
if (context_replacement) {
GstGLContext *old = *other_context;
*other_context = context_replacement;
if (old)
gst_object_unref (old);
}
return TRUE;
}
gboolean
gst_gl_handle_context_query (GstElement * element, GstQuery * query,
GstGLDisplay ** display, GstGLContext ** other_context)
{
gboolean res = FALSE;
const gchar *context_type;
GstContext *context, *old_context;
g_return_val_if_fail (element != NULL, FALSE);
g_return_val_if_fail (query != NULL, FALSE);
g_return_val_if_fail (display != NULL, FALSE);
g_return_val_if_fail (other_context != NULL, FALSE);
gst_query_parse_context_type (query, &context_type);
if (g_strcmp0 (context_type, GST_GL_DISPLAY_CONTEXT_TYPE) == 0) {
gst_query_parse_context (query, &old_context);
if (old_context)
context = gst_context_copy (old_context);
else
context = gst_context_new (GST_GL_DISPLAY_CONTEXT_TYPE, TRUE);
gst_context_set_gl_display (context, *display);
gst_query_set_context (query, context);
gst_context_unref (context);
res = *display != NULL;
}
#if GST_GL_HAVE_WINDOW_X11
else if (g_strcmp0 (context_type, "gst.x11.display.handle") == 0) {
GstStructure *s;
Display *x11_display = NULL;
gst_query_parse_context (query, &old_context);
if (old_context)
context = gst_context_copy (old_context);
else
context = gst_context_new ("gst.x11.display.handle", TRUE);
if (*display
&& ((*display)->type & GST_GL_DISPLAY_TYPE_X11) ==
GST_GL_DISPLAY_TYPE_X11)
x11_display = (Display *) gst_gl_display_get_handle (*display);
s = gst_context_writable_structure (context);
gst_structure_set (s, "display", G_TYPE_POINTER, x11_display, NULL);
gst_query_set_context (query, context);
gst_context_unref (context);
res = x11_display != NULL;
}
#endif
else if (g_strcmp0 (context_type, "gst.gl.app_context") == 0) {
GstStructure *s;
gst_query_parse_context (query, &old_context);
if (old_context)
context = gst_context_copy (old_context);
else
context = gst_context_new ("gst.gl.app_context", TRUE);
s = gst_context_writable_structure (context);
gst_structure_set (s, "context", GST_GL_TYPE_CONTEXT, *other_context, NULL);
gst_query_set_context (query, context);
gst_context_unref (context);
res = *other_context != NULL;
}
return res;
}
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