Add kawase blur (#120)

Co-authored-by: Erik Reider <[email protected]>
Co-authored-by: Will McKinnon <[email protected]>

8 files changed, 100 insertions, 8 deletions

diff --git a/include/sway/commands.h b/include/sway/commands.h
index 91b1fc58..b895d5f2 100644
--- a/include/sway/commands.h
+++ b/include/sway/commands.h
@@ -109,6 +109,10 @@ sway_cmd cmd_bindcode;
 sway_cmd cmd_bindgesture;
 sway_cmd cmd_bindswitch;
 sway_cmd cmd_bindsym;
+sway_cmd cmd_blur;
+sway_cmd cmd_blur_passes;
+sway_cmd cmd_blur_radius;
+sway_cmd cmd_blur_xray;
 sway_cmd cmd_border;
 sway_cmd cmd_client_noop;
 sway_cmd cmd_client_focused;
diff --git a/include/sway/config.h b/include/sway/config.h
index 2dc4b52d..cabc9cf5 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -470,23 +470,33 @@ enum xwayland_mode {
 	XWAYLAND_MODE_IMMEDIATE,
 };
 
+struct blur_parameters {
+	int num_passes;
+	int radius;
+};
+
 /**
  * The configuration struct. The result of loading a config file.
  */
 struct sway_config {
-	// SwayFX config options
 	int corner_radius;
 	bool smart_corner_radius;
+
 	float default_dim_inactive;
-	// dim_inactive colors
 	struct {
 		float unfocused[4];
 		float urgent[4];
 	} dim_inactive_colors;
+
 	bool shadow_enabled;
 	bool shadows_on_csd_enabled;
 	int shadow_blur_sigma;
 	float shadow_color[4];
+
+	bool blur_enabled;
+	bool blur_xray;
+	struct blur_parameters blur_params;
+
 	bool titlebar_separator;
 	bool scratchpad_minimize;
 
diff --git a/include/sway/desktop/fx_renderer/fx_framebuffer.h b/include/sway/desktop/fx_renderer/fx_framebuffer.h
new file mode 100644
index 00000000..965c1def
--- /dev/null
+++ b/include/sway/desktop/fx_renderer/fx_framebuffer.h
@@ -0,0 +1,23 @@
+#ifndef FX_FRAMEBUFFER_H
+#define FX_FRAMEBUFFER_H
+
+#include <GLES2/gl2.h>
+#include <stdbool.h>
+#include <wlr/types/wlr_output.h>
+
+#include "sway/desktop/fx_renderer/fx_texture.h"
+
+struct fx_framebuffer {
+	struct fx_texture texture;
+	GLuint fb;
+};
+
+void fx_framebuffer_bind(struct fx_framebuffer *buffer, GLsizei width, GLsizei height);
+
+void fx_framebuffer_create(struct wlr_output *output, struct fx_framebuffer *buffer,
+		bool bind);
+
+void fx_framebuffer_release(struct fx_framebuffer *buffer);
+
+
+#endif
diff --git a/include/sway/desktop/fx_renderer/fx_renderer.h b/include/sway/desktop/fx_renderer/fx_renderer.h
index a48a00e1..37887d30 100644
--- a/include/sway/desktop/fx_renderer/fx_renderer.h
+++ b/include/sway/desktop/fx_renderer/fx_renderer.h
@@ -5,6 +5,9 @@
 #include <GLES2/gl2ext.h>
 #include <stdbool.h>
 
+#include "sway/desktop/fx_renderer/fx_framebuffer.h"
+#include "sway/desktop/fx_renderer/fx_texture.h"
+
 enum corner_location { ALL, TOP_LEFT, TOP_RIGHT, BOTTOM_LEFT, BOTTOM_RIGHT, NONE };
 
 enum fx_tex_shader_source {
@@ -24,8 +27,9 @@ struct decoration_data {
 	float saturation;
 	int corner_radius;
 	float dim;
-	float* dim_color;
+	float *dim_color;
 	bool has_titlebar;
+	bool blur;
 };
 
 struct gles2_tex_shader {
@@ -54,13 +58,34 @@ struct rounded_quad_shader {
 	GLint radius;
 };
 
+struct blur_shader {
+	GLuint program;
+	GLint proj;
+	GLint tex;
+	GLint pos_attrib;
+	GLint tex_attrib;
+	GLint radius;
+	GLint halfpixel;
+};
+
 struct fx_renderer {
 	struct wlr_egl *egl;
 
 	float projection[9];
 
+	struct sway_output *sway_output;
+
 	GLuint stencil_buffer_id;
 
+	struct fx_framebuffer wlr_buffer; // Just the framebuffer used by wlroots
+	struct fx_framebuffer main_buffer; // The main FB used for rendering
+	struct fx_framebuffer blur_buffer; // Contains the blurred background for tiled windows
+	// Blur swaps between the two effects buffers everytime it scales the image
+	struct fx_framebuffer effects_buffer; // Buffer used for effects
+	struct fx_framebuffer effects_buffer_swapped; // Swap buffer used for effects
+
+	bool blur_buffer_dirty;
+
 	struct {
 		bool OES_egl_image_external;
 	} exts;
@@ -83,6 +108,9 @@ struct fx_renderer {
 		struct rounded_quad_shader rounded_tl_quad;
 		struct rounded_quad_shader rounded_tr_quad;
 
+		struct blur_shader blur1;
+		struct blur_shader blur2;
+
 		struct {
 			GLuint program;
 			GLint proj;
@@ -117,19 +145,21 @@ struct fx_renderer {
 
 struct fx_renderer *fx_renderer_create(struct wlr_egl *egl);
 
-void fx_renderer_begin(struct fx_renderer *renderer, uint32_t width, uint32_t height);
+void fx_renderer_fini(struct fx_renderer *renderer);
+
+void fx_renderer_begin(struct fx_renderer *renderer, struct sway_output *output);
 
-void fx_renderer_end();
+void fx_renderer_end(struct fx_renderer *renderer);
 
 void fx_renderer_clear(const float color[static 4]);
 
 void fx_renderer_scissor(struct wlr_box *box);
 
-bool fx_render_subtexture_with_matrix(struct fx_renderer *renderer, struct wlr_texture *wlr_texture,
+bool fx_render_subtexture_with_matrix(struct fx_renderer *renderer, struct fx_texture *fx_texture,
 		const struct wlr_fbox *src_box, const struct wlr_box *dst_box, const float matrix[static 9],
 		struct decoration_data deco_data);
 
-bool fx_render_texture_with_matrix(struct fx_renderer *renderer, struct wlr_texture *wlr_texture,
+bool fx_render_texture_with_matrix(struct fx_renderer *renderer, struct fx_texture *fx_texture,
 		const struct wlr_box *dst_box, const float matrix[static 9], struct decoration_data deco_data);
 
 void fx_render_rect(struct fx_renderer *renderer, const struct wlr_box *box,
@@ -146,4 +176,8 @@ void fx_render_border_corner(struct fx_renderer *renderer, const struct wlr_box
 void fx_render_box_shadow(struct fx_renderer *renderer, const struct wlr_box *box,
 		const float color[static 4], const float projection[static 9], int radius, float blur_sigma);
 
+void fx_render_blur(struct fx_renderer *renderer, struct sway_output *output,
+		const float matrix[static 9], struct fx_framebuffer **buffer,
+		struct blur_shader *shader, const struct wlr_box *box, int blur_radius);
+
 #endif
diff --git a/include/sway/desktop/fx_renderer/fx_texture.h b/include/sway/desktop/fx_renderer/fx_texture.h
new file mode 100644
index 00000000..0c375913
--- /dev/null
+++ b/include/sway/desktop/fx_renderer/fx_texture.h
@@ -0,0 +1,18 @@
+#ifndef FX_TEXTURE_H
+#define FX_TEXTURE_H
+
+#include <GLES2/gl2.h>
+#include <stdbool.h>
+#include <wlr/render/wlr_texture.h>
+
+struct fx_texture {
+	GLuint target;
+	GLuint id;
+	bool has_alpha;
+	int width;
+	int height;
+};
+
+struct fx_texture fx_texture_from_wlr_texture(struct wlr_texture* tex);
+
+#endif
diff --git a/include/sway/output.h b/include/sway/output.h
index a6bec10a..65f7ca1a 100644
--- a/include/sway/output.h
+++ b/include/sway/output.h
@@ -24,6 +24,8 @@ struct sway_output {
 	struct sway_server *server;
 	struct wl_list link;
 
+	struct fx_renderer *renderer;
+
 	struct wl_list layers[4]; // sway_layer_surface::link
 	struct wlr_box usable_area;
 
diff --git a/include/sway/server.h b/include/sway/server.h
index 0c2eccf3..96c3623f 100644
--- a/include/sway/server.h
+++ b/include/sway/server.h
@@ -37,7 +37,6 @@ struct sway_server {
 	// secondary headless backend used for creating virtual outputs on-the-fly
 	struct wlr_backend *headless_backend;
 	struct wlr_renderer *wlr_renderer;
-	struct fx_renderer *renderer;
 	struct wlr_allocator *allocator;
 
 	struct wlr_compositor *compositor;
diff --git a/include/sway/tree/container.h b/include/sway/tree/container.h
index 1d8e5a36..3cd668f9 100644
--- a/include/sway/tree/container.h
+++ b/include/sway/tree/container.h
@@ -115,6 +115,8 @@ struct sway_container {
 
 	bool shadow_enabled;
 
+	bool blur_enabled;
+
 	float saturation;
 
 	float alpha;