Initial?? Commit

assets/shaders/crt/frag.glsl

@@ -0,0 +1,46 @@
+#version 330 core
+precision lowp float;
+
+in vec2 v_tex_coords;
+
+uniform sampler2D texture;
+
+uniform vec2 screen_resolution;
+
+uniform vec2 curvature = vec2(3.0, 3.0);
+uniform vec2 scanline_opacity = vec2(1.0, 1.0);
+uniform float brightness = 3.0;
+
+out vec4 f_color;
+
+const float PI = 3.14159;
+
+vec2 curve_uv(vec2 uv) {
+    uv = uv * 2.0 - 1.0;
+    vec2 offset = abs(uv.yx) / vec2(curvature.x, curvature.y);
+    uv = uv + uv * offset * offset;
+    uv = uv * 0.5 + 0.5;
+    return uv;
+}
+
+vec3 scanline_intensity(float uv, float resolution, float opacity) {
+    float intensity = sin(uv * resolution * PI * 2.0);
+    intensity = ((0.5 * intensity) + 0.5) * 0.9 + 0.1;
+    return vec3(pow(intensity, opacity));
+}
+
+void main() {
+    vec2 curved_uv = curve_uv(v_tex_coords);
+    vec3 base_color = texture2D(texture, curved_uv).rgb;
+
+    base_color += vec3(1.0/256.0);
+    base_color *= scanline_intensity(curved_uv.x, screen_resolution.y, scanline_opacity.x);
+    base_color *= scanline_intensity(curved_uv.y, screen_resolution.x, scanline_opacity.y);
+    base_color *= vec3(brightness);
+
+    if (curved_uv.x < 0.0 || curved_uv.y < 0.0 || curved_uv.x > 1.0 || curved_uv.y > 1.0) {
+        f_color = vec4(0.0, 0.0, 0.0, 1.0);
+    } else {
+        f_color = vec4(base_color, 1.0);
+    }
+}