[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

2 files changed, 57 insertions, 4 deletions

diff --git a/include/render/fx_renderer/fx_renderer.h b/include/render/fx_renderer/fx_renderer.h
index 4a95634..83ac305 100644
--- a/include/render/fx_renderer/fx_renderer.h
+++ b/include/render/fx_renderer/fx_renderer.h
@@ -13,7 +13,6 @@
 
 #include "render/fx_renderer/shaders.h"
 #include "render/pass.h"
-#include "scenefx/types/fx/shadow_data.h"
 
 struct fx_pixel_format {
 	uint32_t drm_format;
@@ -48,13 +47,15 @@ struct fx_framebuffer {
 	struct wlr_addon addon;
 };
 
+/** Should only be used with custom fbs */
+void fx_framebuffer_get_or_create_custom(struct fx_renderer *fx_renderer,
+		struct wlr_output *output, struct fx_framebuffer **fx_buffer);
+
 struct fx_framebuffer *fx_framebuffer_get_or_create(struct fx_renderer *renderer,
 		struct wlr_buffer *wlr_buffer);
 
 void fx_framebuffer_bind(struct fx_framebuffer *buffer);
 
-void fx_framebuffer_bind_wlr_fbo(struct fx_renderer *renderer);
-
 void fx_framebuffer_destroy(struct fx_framebuffer *buffer);
 
 ///
@@ -148,6 +149,9 @@ struct fx_renderer {
 		struct tex_shader tex_ext;
 		struct box_shadow_shader box_shadow;
 		struct stencil_mask_shader stencil_mask;
+		struct blur_shader blur1;
+		struct blur_shader blur2;
+		struct blur_effects_shader blur_effects;
 	} shaders;
 
 	struct wl_list buffers; // fx_framebuffer.link
@@ -155,6 +159,21 @@ struct fx_renderer {
 
 	struct fx_framebuffer *current_buffer;
 	uint32_t viewport_width, viewport_height;
+
+	// Contains the blurred background for tiled windows
+	struct fx_framebuffer *optimized_blur_buffer;
+	// Contains the original pixels to draw over the areas where artifact are visible
+	struct fx_framebuffer *blur_saved_pixels_buffer;
+	// Blur swaps between the two effects buffers everytime it scales the image
+	// Buffer used for effects
+	struct fx_framebuffer *effects_buffer;
+	// Swap buffer used for effects
+	struct fx_framebuffer *effects_buffer_swapped;
+
+	// The region where there's blur
+	pixman_region32_t blur_padding_region;
+
+	bool blur_buffer_dirty;
 };
 
 bool wlr_renderer_is_fx(struct wlr_renderer *wlr_renderer);
diff --git a/include/render/fx_renderer/shaders.h b/include/render/fx_renderer/shaders.h
index 92a14d5..226dd36 100644
--- a/include/render/fx_renderer/shaders.h
+++ b/include/render/fx_renderer/shaders.h
@@ -27,6 +27,8 @@ struct quad_shader {
 	GLint pos_attrib;
 };
 
+bool link_quad_program(struct quad_shader *shader);
+
 struct tex_shader {
 	GLuint program;
 	GLint proj;
@@ -37,8 +39,11 @@ struct tex_shader {
 	GLint size;
 	GLint position;
 	GLint radius;
+	GLint discard_transparent;
 };
 
+bool link_tex_program(struct tex_shader *shader, enum fx_tex_shader_source source);
+
 struct stencil_mask_shader {
 	GLuint program;
 	GLint proj;
@@ -49,6 +54,8 @@ struct stencil_mask_shader {
 	GLint radius;
 };
 
+bool link_stencil_mask_program(struct stencil_mask_shader *shader);
+
 struct box_shadow_shader {
 	GLuint program;
 	GLint proj;
@@ -60,6 +67,33 @@ struct box_shadow_shader {
 	GLint corner_radius;
 };
 
-bool link_shaders(struct fx_renderer *renderer);
+bool link_box_shadow_program(struct box_shadow_shader *shader);
+
+struct blur_shader {
+	GLuint program;
+	GLint proj;
+	GLint tex_proj;
+	GLint tex;
+	GLint pos_attrib;
+	GLint radius;
+	GLint halfpixel;
+};
+
+bool link_blur1_program(struct blur_shader *shader);
+bool link_blur2_program(struct blur_shader *shader);
+
+struct blur_effects_shader {
+	GLuint program;
+	GLint proj;
+	GLint tex_proj;
+	GLint tex;
+	GLint pos_attrib;
+	GLfloat noise;
+	GLfloat brightness;
+	GLfloat contrast;
+	GLfloat saturation;
+};
+
+bool link_blur_effects_program(struct blur_effects_shader *shader);
 
 #endif