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gsk: Avoid downloading GL textures when possible

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I found that the gears demo was spending 40% cpu
downloading a GL texture every frame, only to
upload it again to another context.

While the GSK rendering and the GtkGLArea use different
GL contexts, they are (usually) connected by sharing data
with the same global context, so we can just use the
texture without the download/upload dance. This brings
gears down to < 10% cpu.
This commit is contained in:
Matthias Clasen 2020-09-26 21:55:28 -04:00
parent 92e551f895
commit 9ca9f42452
1 changed files with 8 additions and 6 deletions
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14
gsk/gl/gskgldriver.c
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@ -521,8 +521,15 @@ gsk_gl_driver_get_texture_for_texture (GskGLDriver *self,
if (GDK_IS_GL_TEXTURE (texture))
{
GdkGLContext *texture_context = gdk_gl_texture_get_context ((GdkGLTexture *)texture);
GdkGLContext *shared_context = gdk_gl_context_get_shared_context (self->gl_context);
if (texture_context != self->gl_context)
if (texture_context == self->gl_context ||
(gdk_gl_context_get_shared_context (texture_context) == shared_context && shared_context != NULL))
{
/* A GL texture from the same GL context is a simple task... */
return gdk_gl_texture_get_id ((GdkGLTexture *)texture);
}
else
{
cairo_surface_t *surface;
@ -539,11 +546,6 @@ gsk_gl_driver_get_texture_for_texture (GskGLDriver *self,
source_texture = downloaded_texture;
}
else
{
/* A GL texture from the same GL context is a simple task... */
return gdk_gl_texture_get_id ((GdkGLTexture *)texture);
}
}
else
{