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glcompositionoverlay: Add compatibility for GL contexts without glGenVertexArrays

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=745107
This commit is contained in:
Lubosz Sarnecki 2015-06-18 14:15:01 +02:00 committed by Tim-Philipp Müller
parent 279c2b07b4
commit 170ac41a87
1 changed files with 31 additions and 4 deletions
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35
gst-libs/gst/gl/gstglcompositionoverlay.c
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@ -123,6 +123,25 @@ gst_gl_composition_overlay_finalize (GObject * object)
G_OBJECT_CLASS (gst_gl_composition_overlay_parent_class)->finalize (object);
}
static void
gst_gl_composition_overlay_bind_vertex_buffer (GstGLCompositionOverlay *
overlay)
{
const GstGLFuncs *gl = overlay->context->gl_vtable;
gl->BindBuffer (GL_ARRAY_BUFFER, overlay->position_buffer);
gl->VertexAttribPointer (overlay->position_attrib, 4, GL_FLOAT, GL_FALSE,
4 * sizeof (GLfloat), NULL);
gl->BindBuffer (GL_ARRAY_BUFFER, overlay->texcoord_buffer);
gl->VertexAttribPointer (overlay->texcoord_attrib, 2, GL_FLOAT, GL_FALSE,
2 * sizeof (GLfloat), NULL);
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, overlay->index_buffer);
gl->EnableVertexAttribArray (overlay->position_attrib);
gl->EnableVertexAttribArray (overlay->texcoord_attrib);
}
static void
gst_gl_composition_overlay_init_vertex_buffer (GstGLContext * context,
gpointer overlay_pointer)
@ -144,8 +163,10 @@ gst_gl_composition_overlay_init_vertex_buffer (GstGLContext * context,
};
/* *INDENT-ON* */
gl->GenVertexArrays (1, &overlay->vao);
gl->BindVertexArray (overlay->vao);
if (gl->GenVertexArrays) {
gl->GenVertexArrays (1, &overlay->vao);
gl->BindVertexArray (overlay->vao);
}
gl->GenBuffers (1, &overlay->position_buffer);
gl->BindBuffer (GL_ARRAY_BUFFER, overlay->position_buffer);
@ -173,7 +194,9 @@ gst_gl_composition_overlay_init_vertex_buffer (GstGLContext * context,
gl->EnableVertexAttribArray (overlay->position_attrib);
gl->EnableVertexAttribArray (overlay->texcoord_attrib);
gl->BindVertexArray (0);
if (gl->GenVertexArrays) {
gl->BindVertexArray (0);
}
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, 0);
gl->BindBuffer (GL_ARRAY_BUFFER, 0);
@ -321,7 +344,11 @@ gst_gl_composition_overlay_draw (GstGLCompositionOverlay * overlay,
GstGLShader * shader)
{
const GstGLFuncs *gl = overlay->context->gl_vtable;
gl->BindVertexArray (overlay->vao);
if (gl->GenVertexArrays)
gl->BindVertexArray (overlay->vao);
else
gst_gl_composition_overlay_bind_vertex_buffer (overlay);
if (overlay->texture_id != -1)
gl->BindTexture (GL_TEXTURE_2D, overlay->texture_id);
gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);