feat: initial fx_renderer implementation

6 files changed, 97 insertions, 0 deletions

diff --git a/render/fx_renderer/gles2/meson.build b/render/fx_renderer/gles2/meson.build
new file mode 100644
index 0000000..70cde2c
--- /dev/null
+++ b/render/fx_renderer/gles2/meson.build
@@ -0,0 +1,2 @@
+subdir('shaders')
+
diff --git a/render/fx_renderer/gles2/shaders/common.vert b/render/fx_renderer/gles2/shaders/common.vert
new file mode 100644
index 0000000..811e0f2
--- /dev/null
+++ b/render/fx_renderer/gles2/shaders/common.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;
+}
diff --git a/render/fx_renderer/gles2/shaders/embed.sh b/render/fx_renderer/gles2/shaders/embed.sh
new file mode 100644
index 0000000..47f0789
--- /dev/null
+++ b/render/fx_renderer/gles2/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 "};"
diff --git a/render/fx_renderer/gles2/shaders/meson.build b/render/fx_renderer/gles2/shaders/meson.build
new file mode 100644
index 0000000..ee030a2
--- /dev/null
+++ b/render/fx_renderer/gles2/shaders/meson.build
@@ -0,0 +1,21 @@
+embed = find_program('./embed.sh', native: true)
+
+shaders = [
+    'common.vert',
+    'quad.frag',
+    'tex.frag',
+]
+
+foreach name : shaders
+    output = name.underscorify() + '_src.h'
+    var = name.underscorify() + '_src'
+    wlr_files += custom_target(
+        output,
+        command: [embed, var],
+        input: name,
+        output: output,
+        feed: true,
+        capture: true,
+    )
+endforeach
+
diff --git a/render/fx_renderer/gles2/shaders/quad.frag b/render/fx_renderer/gles2/shaders/quad.frag
new file mode 100644
index 0000000..7c76327
--- /dev/null
+++ b/render/fx_renderer/gles2/shaders/quad.frag
@@ -0,0 +1,7 @@
+precision mediump float;
+varying vec4 v_color;
+varying vec2 v_texcoord;
+
+void main() {
+    gl_FragColor = v_color;
+}
diff --git a/render/fx_renderer/gles2/shaders/tex.frag b/render/fx_renderer/gles2/shaders/tex.frag
new file mode 100644
index 0000000..bd3c596
--- /dev/null
+++ b/render/fx_renderer/gles2/shaders/tex.frag
@@ -0,0 +1,44 @@
+#define SOURCE_TEXTURE_RGBA 1
+#define SOURCE_TEXTURE_RGBX 2
+#define SOURCE_TEXTURE_EXTERNAL 3
+
+#if !defined(SOURCE)
+#error "Missing shader preamble"
+#endif
+
+#if SOURCE == SOURCE_TEXTURE_EXTERNAL
+#extension GL_OES_EGL_image_external : require
+#endif
+
+precision mediump float;
+
+varying vec2 v_texcoord;
+
+#if SOURCE == SOURCE_TEXTURE_EXTERNAL
+uniform samplerExternalOES tex;
+#elif SOURCE == SOURCE_TEXTURE_RGBA || SOURCE == SOURCE_TEXTURE_RGBX
+uniform sampler2D tex;
+#endif
+
+uniform float alpha;
+uniform vec2 size;
+uniform vec2 position;
+uniform float radius;
+
+vec4 sample_texture() {
+#if SOURCE == SOURCE_TEXTURE_RGBA || SOURCE == SOURCE_TEXTURE_EXTERNAL
+	return texture2D(tex, v_texcoord);
+#elif SOURCE == SOURCE_TEXTURE_RGBX
+	return vec4(texture2D(tex, v_texcoord).rgb, 1.0);
+#endif
+}
+
+void main() {
+	gl_FragColor = sample_texture() * 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(-1.0, 0.5, d);
+		gl_FragColor = mix(vec4(0), gl_FragColor, smooth);
+	}
+}