refactor: move shaders to individual files

sway/desktop/fx_renderer.c

@@ -14,10 +14,18 @@
 #include <wlr/util/box.h>
 #include "log.h"
 #include "sway/desktop/fx_renderer.h"
-#include "sway/desktop/shaders.h"
 #include "sway/output.h"
 #include "sway/server.h"
 
+// shaders
+#include "quad_vert_src.h"
+#include "quad_frag_src.h"
+#include "corner_frag_src.h"
+#include "tex_vert_src.h"
+#include "tex_rgba_frag_src.h"
+#include "tex_rgbx_frag_src.h"
+#include "tex_external_frag_src.h"
+
 static const GLfloat verts[] = {
 	1, 0, // top right
 	0, 0, // top left
@@ -125,7 +133,7 @@ struct fx_renderer *fx_renderer_create(struct wlr_egl *egl) {
 	// init shaders
 	GLuint prog;
 
-	prog = link_program(quad_vertex_src, quad_fragment_src);
+	prog = link_program(quad_vert_src, quad_frag_src);
 	renderer->shaders.quad.program = prog;
 	if (!renderer->shaders.quad.program) {
 		goto error;
@@ -135,7 +143,7 @@ struct fx_renderer *fx_renderer_create(struct wlr_egl *egl) {
 	renderer->shaders.quad.pos_attrib = glGetAttribLocation(prog, "pos");
 
 	// Border corners
-	prog = link_program(quad_vertex_src, corner_fragment_src);
+	prog = link_program(quad_vert_src, corner_frag_src);
 	renderer->shaders.corner.program = prog;
 	if (!renderer->shaders.corner.program) {
 		goto error;
@@ -153,15 +161,15 @@ struct fx_renderer *fx_renderer_create(struct wlr_egl *egl) {
 	renderer->shaders.corner.half_thickness = glGetUniformLocation(prog, "half_thickness");
 
 	// fragment shaders
-	prog = link_program(tex_vertex_src, tex_fragment_src_rgba);
+	prog = link_program(tex_vert_src, tex_rgba_frag_src);
 	if (!init_frag_shader(&renderer->shaders.tex_rgba, prog)) {
 		goto error;
 	}
-	prog = link_program(tex_vertex_src, tex_fragment_src_rgbx);
+	prog = link_program(tex_vert_src, tex_rgbx_frag_src);
 	if (!init_frag_shader(&renderer->shaders.tex_rgbx, prog)) {
 		goto error;
 	}
-	prog = link_program(tex_vertex_src, tex_fragment_src_external);
+	prog = link_program(tex_vert_src, tex_external_frag_src);
 	if (!init_frag_shader(&renderer->shaders.tex_ext, prog)) {
 		goto error;
 	}

sway/desktop/shaders/corner.frag

@@ -0,0 +1,36 @@
+precision mediump float;
+varying vec4 v_color;
+varying vec2 v_texcoord;
+
+uniform bool is_top_left;
+uniform bool is_top_right;
+uniform bool is_bottom_left;
+uniform bool is_bottom_right;
+
+uniform vec2 position;
+uniform float radius;
+uniform vec2 half_size;
+uniform float half_thickness;
+
+float roundedBoxSDF(vec2 center, vec2 size, float radius) {
+    return length(max(abs(center) - size + radius, 0.0)) - radius;
+}
+
+void main() {
+    vec2 center = gl_FragCoord.xy - position - half_size;
+    float distance = roundedBoxSDF(center, half_size - half_thickness, radius + half_thickness);
+    float smoothedAlphaOuter = 1.0 - smoothstep(-1.0, 1.0, distance - half_thickness);
+// Create an inner circle that isn't as anti-aliased as the outer ring
+    float smoothedAlphaInner = 1.0 - smoothstep(-1.0, 0.5, distance + half_thickness);
+    gl_FragColor = mix(vec4(0), v_color, smoothedAlphaOuter - smoothedAlphaInner);
+
+    if (is_top_left && (center.y > 0.0 || center.x > 0.0)) {
+        discard;
+    } else if (is_top_right && (center.y > 0.0 || center.x < 0.0)) {
+        discard;
+    } else if (is_bottom_left && (center.y < 0.0 || center.x > 0.0)) {
+        discard;
+    } else if (is_bottom_right && (center.y < 0.0 || center.x < 0.0)) {
+        discard;
+    }
+}

sway/desktop/shaders/embed.sh

@@ -0,0 +1,11 @@
+#!/bin/sh -eu
+
+var=${1:-data}
+hex="$(od -A n -t x1 -v)"
+
+echo "static const char $var[] = {"
+for byte in $hex; do
+    echo "	0x$byte,"
+done
+echo "	0x00,"
+echo "};"

sway/desktop/shaders/meson.build

@@ -0,0 +1,24 @@
+embed = find_program('./embed.sh', native: true)
+
+shaders = [
+    'quad.vert',
+    'quad.frag',
+    'tex.vert',
+    'corner.frag',
+    'tex_rgba.frag',
+    'tex_rgbx.frag',
+    'tex_external.frag',
+]
+
+foreach name : shaders
+    output = name.underscorify() + '_src.h'
+    var = name.underscorify() + '_src'
+    sway_sources += custom_target(
+        output,
+        command: [embed, var],
+        input: name,
+        output: output,
+        feed: true,
+        capture: true,
+    )
+endforeach

sway/desktop/shaders/quad.frag

@@ -0,0 +1,7 @@
+precision mediump float;
+varying vec4 v_color;
+varying vec2 v_texcoord;
+
+void main() {
+    gl_FragColor = v_color;
+}

sway/desktop/shaders/quad.vert

@@ -0,0 +1,12 @@
+uniform mat3 proj;
+uniform vec4 color;
+attribute vec2 pos;
+attribute vec2 texcoord;
+varying vec4 v_color;
+varying vec2 v_texcoord;
+
+void main() {
+    gl_Position = vec4(proj * vec3(pos, 1.0), 1.0);
+    v_color = color;
+    v_texcoord = texcoord;
+}

sway/desktop/shaders/tex.vert

@@ -0,0 +1,9 @@
+uniform mat3 proj;
+attribute vec2 pos;
+attribute vec2 texcoord;
+varying vec2 v_texcoord;
+
+void main() {
+    gl_Position = vec4(proj * vec3(pos, 1.0), 1.0);
+    v_texcoord = texcoord;
+}

sway/desktop/shaders/tex_external.frag

@@ -0,0 +1,20 @@
+#extension GL_OES_EGL_image_external : require
+
+precision mediump float;
+varying vec2 v_texcoord;
+uniform samplerExternalOES texture0;
+uniform float alpha;
+
+uniform vec2 size;
+uniform vec2 position;
+uniform float radius;
+
+void main() {
+    gl_FragColor = texture2D(texture0, v_texcoord) * alpha;
+   vec2 corner_distance = min(gl_FragCoord.xy - position, position + size - gl_FragCoord.xy);
+   if (max(corner_distance.x, corner_distance.y) < radius) {
+        float d = radius - distance(corner_distance, vec2(radius));
+        float smooth = smoothstep(-1.0f, 0.5f, d);
+        gl_FragColor = mix(vec4(0), gl_FragColor, smooth);
+   }
+}

sway/desktop/shaders/tex_rgba.frag

@@ -0,0 +1,18 @@
+precision mediump float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+uniform float alpha;
+
+uniform vec2 size;
+uniform vec2 position;
+uniform float radius;
+
+void main() {
+   gl_FragColor = texture2D(tex, v_texcoord) * alpha;
+   vec2 corner_distance = min(gl_FragCoord.xy - position, size + position - gl_FragCoord.xy);
+   if (max(corner_distance.x, corner_distance.y) < radius) {
+        float d = radius - distance(corner_distance, vec2(radius));
+        float smooth = smoothstep(-1.0f, 0.5f, d);
+        gl_FragColor = mix(vec4(0), gl_FragColor, smooth);
+   }
+}

sway/desktop/shaders/tex_rgbx.frag

@@ -0,0 +1,18 @@
+precision mediump float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+uniform float alpha;
+
+uniform vec2 size;
+uniform vec2 position;
+uniform float radius;
+
+void main() {
+    gl_FragColor = vec4(texture2D(tex, v_texcoord).rgb, 1.0) * alpha;
+   vec2 corner_distance = min(gl_FragCoord.xy - position, position + size - gl_FragCoord.xy);
+   if (max(corner_distance.x, corner_distance.y) < radius) {
+        float d = radius - distance(corner_distance, vec2(radius));
+        float smooth = smoothstep(-1.0f, 0.5f, d);
+        gl_FragColor = mix(vec4(0), gl_FragColor, smooth);
+   }
+}

sway/meson.build

@@ -206,6 +206,8 @@ sway_sources = files(
     'tree/output.c',
 )
 
+subdir('desktop/shaders')
+
 sway_deps = [
     cairo,
     drm,