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qmlglsink: Add dummy texture that is shown as placeholder for NULL buffers

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=782917
This commit is contained in:
Carlos Rafael Giani 2017-05-21 15:26:12 +02:00 committed by Matthew Waters
parent b33563294f
commit fdb2784491
2 changed files with 42 additions and 0 deletions
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41
ext/qt/gstqsgtexture.cc
View file

@ -22,6 +22,7 @@
#include "config.h"
#endif
#include <vector>
#include <stdio.h>
#include <gst/video/video.h>
@ -47,12 +48,17 @@ GstQSGTexture::GstQSGTexture ()
this->buffer_ = NULL;
this->qt_context_ = NULL;
this->sync_buffer_ = gst_buffer_new ();
this->dummy_tex_id_ = 0;
}
GstQSGTexture::~GstQSGTexture ()
{
gst_buffer_replace (&this->buffer_, NULL);
gst_buffer_replace (&this->sync_buffer_, NULL);
if (this->dummy_tex_id_ && QOpenGLContext::currentContext ()) {
QOpenGLContext::currentContext ()->functions ()->glDeleteTextures (1,
&this->dummy_tex_id_);
}
}
/* only called from the streaming thread with scene graph thread blocked */
@ -87,6 +93,7 @@ GstQSGTexture::bind ()
GstGLSyncMeta *sync_meta;
GstMemory *mem;
guint tex_id;
gboolean use_dummy_tex = TRUE;
if (!this->qt_context_)
return;
@ -132,7 +139,41 @@ GstQSGTexture::bind ()
gst_video_frame_unmap (&this->v_frame);
/* Texture was successfully bound, so we do not need
* to use the dummy texture */
use_dummy_tex = FALSE;
out:
if (G_UNLIKELY (use_dummy_tex)) {
QOpenGLContext *qglcontext = QOpenGLContext::currentContext ();
QOpenGLFunctions *funcs = qglcontext->functions ();
/* Create dummy texture if not already present.
* Use the Qt OpenGL functions instead of the GstGL ones,
* since we are using the Qt OpenGL context here, and we must
* be able to delete the texture in the destructor. */
if (this->dummy_tex_id_ == 0) {
/* Make this a black 64x64 pixel RGBA texture.
* This size and format is supported pretty much everywhere, so these
* are a safe pick. (64 pixel sidelength must be supported according
* to the GLES2 spec, table 6.18.)
* Set min/mag filters to GL_LINEAR to make sure no mipmapping is used. */
const int tex_sidelength = 64;
std::vector < guint8 > dummy_data (tex_sidelength * tex_sidelength * 4, 0);
funcs->glGenTextures (1, &this->dummy_tex_id_);
funcs->glBindTexture (GL_TEXTURE_2D, this->dummy_tex_id_);
funcs->glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
funcs->glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
funcs->glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, tex_sidelength,
tex_sidelength, 0, GL_RGBA, GL_UNSIGNED_BYTE, &dummy_data[0]);
}
g_assert (this->dummy_tex_id_ != 0);
funcs->glBindTexture (GL_TEXTURE_2D, this->dummy_tex_id_);
}
gst_gl_context_activate (this->qt_context_, FALSE);
}

1
ext/qt/gstqsgtexture.h
View file

@ -51,6 +51,7 @@ private:
GstBuffer * sync_buffer_;
GstGLContext * qt_context_;
GstMemory * mem_;
GLuint dummy_tex_id_;
GstVideoInfo v_info;
GstVideoFrame v_frame;
};