From b929a2bbadf467864796ad4ec90882ce86cfebff Mon Sep 17 00:00:00 2001
From: Erik Reider <35975961+ErikReider@users.noreply.github.com>
Date: Sun, 6 Aug 2023 20:48:58 +0200
Subject: feat: add box shadows (#16)

---
 include/render/fx_renderer/fx_renderer.h      | 45 +++++++++++++++++++++++++++
 include/render/fx_renderer/fx_stencilbuffer.h | 20 ++++++++++++
 include/types/fx/shadow_data.h                | 17 ++++++++++
 include/wlr/types/wlr_scene.h                 |  8 +++++
 4 files changed, 90 insertions(+)
 create mode 100644 include/render/fx_renderer/fx_stencilbuffer.h
 create mode 100644 include/types/fx/shadow_data.h

(limited to 'include')

diff --git a/include/render/fx_renderer/fx_renderer.h b/include/render/fx_renderer/fx_renderer.h
index 2067c04..f569aa9 100644
--- a/include/render/fx_renderer/fx_renderer.h
+++ b/include/render/fx_renderer/fx_renderer.h
@@ -8,6 +8,8 @@
 #include <wlr/render/wlr_texture.h>
 #include <wlr/util/addon.h>
 #include <wlr/util/box.h>
+#include "render/fx_renderer/fx_stencilbuffer.h"
+#include "types/fx/shadow_data.h"
 
 enum fx_tex_shader_source {
 	SHADER_SOURCE_TEXTURE_RGBA = 1,
@@ -34,9 +36,32 @@ struct tex_shader {
 	GLint radius;
 };
 
+struct stencil_mask_shader {
+	GLuint program;
+	GLint proj;
+	GLint color;
+	GLint pos_attrib;
+	GLint half_size;
+	GLint position;
+	GLint radius;
+};
+
+struct box_shadow_shader {
+	GLuint program;
+	GLint proj;
+	GLint color;
+	GLint pos_attrib;
+	GLint position;
+	GLint size;
+	GLint blur_sigma;
+	GLint corner_radius;
+};
+
 struct fx_renderer {
 	float projection[9];
 
+	struct fx_stencilbuffer stencil_buffer;
+
 	struct wlr_addon addon;
 
 	struct {
@@ -52,6 +77,8 @@ struct fx_renderer {
 		struct tex_shader tex_rgba;
 		struct tex_shader tex_rgbx;
 		struct tex_shader tex_ext;
+		struct box_shadow_shader box_shadow;
+		struct stencil_mask_shader stencil_mask;
 	} shaders;
 };
 
@@ -71,6 +98,19 @@ void fx_renderer_clear(const float color[static 4]);
 
 void fx_renderer_scissor(struct wlr_box *box);
 
+// Initialize the stenciling work
+void fx_renderer_stencil_mask_init(void);
+
+// Close the mask
+void fx_renderer_stencil_mask_close(bool draw_inside_mask);
+
+// Finish stenciling and clear the buffer
+void fx_renderer_stencil_mask_fini(void);
+
+void fx_renderer_stencil_enable(void);
+
+void fx_renderer_stencil_disable(void);
+
 bool fx_render_subtexture_with_matrix(struct fx_renderer *renderer,
 		struct wlr_texture *wlr_texture, const struct wlr_fbox *src_box,
 		const struct wlr_box *dst_box, const float matrix[static 9],
@@ -79,4 +119,9 @@ bool fx_render_subtexture_with_matrix(struct fx_renderer *renderer,
 void fx_render_rect(struct fx_renderer *renderer, const struct wlr_box *box,
 		const float color[static 4], const float projection[static 9]);
 
+void fx_render_box_shadow(struct fx_renderer *renderer,
+		const struct wlr_box *box, const struct wlr_box *stencil_box,
+		const float matrix[static 9], int corner_radius,
+		struct shadow_data *shadow_data);
+
 #endif
diff --git a/include/render/fx_renderer/fx_stencilbuffer.h b/include/render/fx_renderer/fx_stencilbuffer.h
new file mode 100644
index 0000000..6909f96
--- /dev/null
+++ b/include/render/fx_renderer/fx_stencilbuffer.h
@@ -0,0 +1,20 @@
+#ifndef FX_STENCILBUFFER_H
+#define FX_STENCILBUFFER_H
+
+#include <GLES2/gl2.h>
+#include <stdbool.h>
+#include <wlr/render/wlr_texture.h>
+
+struct fx_stencilbuffer {
+	GLuint rb;
+	int width;
+	int height;
+};
+
+struct fx_stencilbuffer fx_stencilbuffer_create(void);
+
+void fx_stencilbuffer_init(struct fx_stencilbuffer *stencil_buffer, int width, int height);
+
+void fx_stencilbuffer_release(struct fx_stencilbuffer *stencil_buffer);
+
+#endif
diff --git a/include/types/fx/shadow_data.h b/include/types/fx/shadow_data.h
new file mode 100644
index 0000000..804acfe
--- /dev/null
+++ b/include/types/fx/shadow_data.h
@@ -0,0 +1,17 @@
+#ifndef TYPES_DECORATION_DATA
+#define TYPES_DECORATION_DATA
+
+#include <stdbool.h>
+#include <wlr/util/addon.h>
+
+struct shadow_data {
+	bool enabled;
+	float *color;
+	float blur_sigma;
+};
+
+struct shadow_data shadow_data_get_default(void);
+
+bool scene_buffer_has_shadow(struct shadow_data *data);
+
+#endif
diff --git a/include/wlr/types/wlr_scene.h b/include/wlr/types/wlr_scene.h
index 138e0e2..7b4c002 100644
--- a/include/wlr/types/wlr_scene.h
+++ b/include/wlr/types/wlr_scene.h
@@ -23,6 +23,7 @@
 #include <wayland-server-core.h>
 #include <wlr/types/wlr_compositor.h>
 #include <wlr/types/wlr_damage_ring.h>
+#include "types/fx/shadow_data.h"
 
 struct wlr_output;
 struct wlr_output_layout;
@@ -151,6 +152,7 @@ struct wlr_scene_buffer {
 
 	float opacity;
 	int corner_radius;
+	struct shadow_data shadow_data;
 
 	uint64_t active_outputs;
 	struct wlr_texture *texture;
@@ -387,6 +389,12 @@ void wlr_scene_buffer_set_opacity(struct wlr_scene_buffer *scene_buffer,
 void wlr_scene_buffer_set_corner_radius(struct wlr_scene_buffer *scene_buffer,
 		int radii);
 
+/**
+* Sets the shadow of this buffer
+*/
+void wlr_scene_buffer_set_shadow_data(struct wlr_scene_buffer *scene_buffer,
+		struct shadow_data shadow_data);
+
 /**
  * Calls the buffer's frame_done signal.
  */
-- 
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