static void
bind_multisample_framebuffer (cairo_gl_context_t *ctx,
cairo_gl_surface_t *surface)
{
cairo_bool_t stencil_test_enabled;
cairo_bool_t scissor_test_enabled;
assert (surface->supports_msaa);
assert (ctx->gl_flavor == CAIRO_GL_FLAVOR_DESKTOP);
_cairo_gl_ensure_framebuffer (ctx, surface);
_cairo_gl_ensure_multisampling (ctx, surface);
if (surface->msaa_active) {
glEnable (GL_MULTISAMPLE);
ctx->dispatch.BindFramebuffer (GL_FRAMEBUFFER, surface->msaa_fb);
return;
}
_cairo_gl_composite_flush (ctx);
stencil_test_enabled = glIsEnabled (GL_STENCIL_TEST);
scissor_test_enabled = glIsEnabled (GL_SCISSOR_TEST);
glDisable (GL_STENCIL_TEST);
glDisable (GL_SCISSOR_TEST);
glEnable (GL_MULTISAMPLE);
/* The last time we drew to the surface, we were not using multisampling,
so we need to blit from the non-multisampling framebuffer into the
multisampling framebuffer. */
ctx->dispatch.BindFramebuffer (GL_DRAW_FRAMEBUFFER, surface->msaa_fb);
ctx->dispatch.BindFramebuffer (GL_READ_FRAMEBUFFER, surface->fb);
ctx->dispatch.BlitFramebuffer (0, 0, surface->width, surface->height,
0, 0, surface->width, surface->height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
ctx->dispatch.BindFramebuffer (GL_FRAMEBUFFER, surface->msaa_fb);
if (stencil_test_enabled)
glEnable (GL_STENCIL_TEST);
if (scissor_test_enabled)
glEnable (GL_SCISSOR_TEST);
}
void
_cairo_gl_context_set_destination (cairo_gl_context_t *ctx,
cairo_gl_surface_t *surface,
cairo_bool_t multisampling)
{
/* OpenGL ES surfaces are always in MSAA mode once it's been turned on,
* so we don't need to check whether we are switching modes for that
* surface type. */
if (ctx->current_target == surface && ! surface->needs_update &&
(ctx->gl_flavor == CAIRO_GL_FLAVOR_ES ||
surface->msaa_active == multisampling))
return;
_cairo_gl_composite_flush (ctx);
ctx->current_target = surface;
surface->needs_update = FALSE;
if (_cairo_gl_surface_is_texture (surface)) {
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_ES) {
_cairo_gl_ensure_framebuffer (ctx, surface);
ctx->dispatch.BindFramebuffer (GL_FRAMEBUFFER, surface->fb);
#if CAIRO_HAS_GL_SURFACE
} else if (multisampling)
_cairo_gl_activate_surface_as_multisampling (ctx, surface);
else {
_cairo_gl_activate_surface_as_nonmultisampling (ctx, surface);
#endif
}
} else {
ctx->make_current (ctx, surface);
#if CAIRO_HAS_GL_SURFACE
if (multisampling)
glEnable(GL_MULTISAMPLE);
else
glDisable(GL_MULTISAMPLE);
#endif
surface->msaa_active = multisampling;
ctx->dispatch.BindFramebuffer (GL_FRAMEBUFFER, 0);
#if CAIRO_HAS_GL_SURFACE
glDrawBuffer (GL_BACK_LEFT);
glReadBuffer (GL_BACK_LEFT);
#endif
}
if (ctx->states_cache.viewport_box.width != surface->width ||
ctx->states_cache.viewport_box.height != surface->height) {
glViewport (0, 0, surface->width, surface->height);
ctx->states_cache.viewport_box.width = surface->width;
ctx->states_cache.viewport_box.height = surface->height;
}
if (_cairo_gl_surface_is_texture (surface))
_gl_identity_ortho (ctx->modelviewprojection_matrix,
0, surface->width, 0, surface->height);
else
_gl_identity_ortho (ctx->modelviewprojection_matrix,
0, surface->width, surface->height, 0);
}