static void
_cairo_gl_activate_surface_as_multisampling (cairo_gl_context_t *ctx,
cairo_gl_surface_t *surface)
{
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);
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);
surface->msaa_active = TRUE;
}
static cairo_bool_t
_cairo_gl_ensure_msaa_depth_stencil_buffer (cairo_gl_context_t *ctx,
cairo_gl_surface_t *surface)
{
cairo_gl_dispatch_t *dispatch = &ctx->dispatch;
_cairo_gl_ensure_framebuffer (ctx, surface);
#if CAIRO_HAS_GL_SURFACE
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_DESKTOP)
_cairo_gl_ensure_multisampling (ctx, surface);
#endif
if (! ctx->shared_msaa_depth_stencil ||
ctx->shared_msaa_depth_stencil_width < surface->width ||
ctx->shared_msaa_depth_stencil_height < surface->height) {
_cairo_gl_replace_msaa_depth_stencil_buffer (ctx,
surface->width,
surface->height);
}
assert (ctx->shared_msaa_depth_stencil);
if (surface->msaa_depth_stencil == ctx->shared_msaa_depth_stencil)
return TRUE;
#if CAIRO_HAS_GL_SURFACE
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_DESKTOP) {
dispatch->FramebufferRenderbuffer (GL_FRAMEBUFFER,
GL_DEPTH_STENCIL_ATTACHMENT,
GL_RENDERBUFFER,
ctx->shared_msaa_depth_stencil);
}
#endif
#if CAIRO_HAS_GLESV2_SURFACE
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_ES) {
dispatch->FramebufferRenderbuffer (GL_FRAMEBUFFER,
GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER,
ctx->shared_msaa_depth_stencil);
dispatch->FramebufferRenderbuffer (GL_FRAMEBUFFER,
GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER,
ctx->shared_msaa_depth_stencil);
}
#endif
surface->msaa_depth_stencil = ctx->shared_msaa_depth_stencil;
if (dispatch->CheckFramebufferStatus (GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
dispatch->DeleteRenderbuffers (1, &surface->msaa_depth_stencil);
surface->msaa_depth_stencil = 0;
return FALSE;
}
return TRUE;
}
static cairo_bool_t
_cairo_gl_ensure_msaa_depth_stencil_buffer (cairo_gl_context_t *ctx,
cairo_gl_surface_t *surface)
{
cairo_gl_dispatch_t *dispatch = &ctx->dispatch;
if (surface->msaa_depth_stencil)
return TRUE;
_cairo_gl_ensure_framebuffer (ctx, surface);
#if CAIRO_HAS_GL_SURFACE
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_DESKTOP)
_cairo_gl_ensure_multisampling (ctx, surface);
#endif
dispatch->GenRenderbuffers (1, &surface->msaa_depth_stencil);
dispatch->BindRenderbuffer (GL_RENDERBUFFER,
surface->msaa_depth_stencil);
dispatch->RenderbufferStorageMultisample (GL_RENDERBUFFER,
ctx->num_samples,
_get_depth_stencil_format (ctx),
surface->width,
surface->height);
#if CAIRO_HAS_GL_SURFACE
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_DESKTOP) {
dispatch->FramebufferRenderbuffer (GL_FRAMEBUFFER,
GL_DEPTH_STENCIL_ATTACHMENT,
GL_RENDERBUFFER,
surface->msaa_depth_stencil);
}
#endif
#if CAIRO_HAS_GLESV2_SURFACE
if (ctx->gl_flavor == CAIRO_GL_FLAVOR_ES) {
dispatch->FramebufferRenderbuffer (GL_FRAMEBUFFER,
GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER,
surface->msaa_depth_stencil);
dispatch->FramebufferRenderbuffer (GL_FRAMEBUFFER,
GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER,
surface->msaa_depth_stencil);
}
#endif
if (dispatch->CheckFramebufferStatus (GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
dispatch->DeleteRenderbuffers (1, &surface->msaa_depth_stencil);
surface->msaa_depth_stencil = 0;
return FALSE;
}
return TRUE;
}
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);
}