[FX Renderer] Add blur (#30)

* Initial blur implementation

* Added additional blur effects from SwayFX

* Simplified blur pass functions to match the other pass functions

* Minor fixes

* Added support for optimized blur

* tinywl: Don't set decoration values every frame

* Updated public blur function docs

* Simplified blur buffer management

* Moved ignore transparent bool into a per buffer option

* Clip the scene_buffer when blur is enabled

* Added back corner and shadow checks in opaque_region function

* Renamed fx_render_blur_options to fx_render_blur_pass_options

* Fixed nits

* Removed unused fx_framebuffer_bind_wlr_fbo function

* Removed wlr_scene impl. Should be moved into future PR instead

* Made blur impl independent of wlr_scene

* Moved shader init back into fx_renderer.c

* Renamed fx_framebuffer_get_or_create_bufferless to fx_framebuffer_get_or_create_custom

1 files changed, 5 insertions, 0 deletions

diff --git a/render/fx_renderer/gles2/shaders/tex.frag b/render/fx_renderer/gles2/shaders/tex.frag
index 8c14373..b7ba3fc 100644
--- a/render/fx_renderer/gles2/shaders/tex.frag
+++ b/render/fx_renderer/gles2/shaders/tex.frag
@@ -29,6 +29,7 @@ uniform float alpha;
 uniform vec2 size;
 uniform vec2 position;
 uniform float radius;
+uniform bool discard_transparent;
 
 vec4 sample_texture() {
 #if SOURCE == SOURCE_TEXTURE_RGBA || SOURCE == SOURCE_TEXTURE_EXTERNAL
@@ -46,4 +47,8 @@ void main() {
 		float smooth = smoothstep(-1.0, 0.5, d);
 		gl_FragColor = mix(vec4(0), gl_FragColor, smooth);
 	}
+
+	if (discard_transparent && gl_FragColor.a == 0.0) {
+		discard;
+	}
 }