Add shaders

Shaders from #22

bloom.frag

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+// blooms entire screen (https://github.com/hyprland-community/awesome-hyprland/issues/22#issuecomment-1682012576) credit to https://github.com/mekb-turtle
+#version 330 core
+
+precision mediump float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+
+uniform int bloomRadius = 10;
+uniform float bloomIntensity = 0.7f;
+uniform float bloomThreshold = 0.4f;
+
+void main() {
+	vec4 color = texture(tex, v_texcoord);
+
+	vec4 bloomThreshold4 = vec4(bloomThreshold);
+	bloomThreshold4.w = 0.0f;
+
+	vec2 invTextureSize = 1.0f / textureSize(tex, 0);
+	float invBloomRadius = bloomRadius == 0 ? 1.0f : 1.0f / float(bloomRadius);
+	float invBloomThreshold = 1.0f / (1.0f - bloomThreshold);
+
+	float samples = 0.0f;
+	vec4 colorSum = vec4(0.0f);
+
+	for (int x = -bloomRadius; x <= bloomRadius; ++x) {
+		for (int y = -bloomRadius; y <= bloomRadius; ++y) {
+			vec2 offset = vec2(x, y) * invTextureSize;
+
+			vec2 coords = v_texcoord + offset;
+			vec4 color = texture(tex, coords);
+			color = max(color - bloomThreshold, vec4(0.0f));
+
+			float strength = 1 - (length(offset) * invBloomRadius);
+			samples += strength;
+
+			strength *= max(max(color.x, color.y), color.z) * invBloomThreshold;
+
+			strength *= bloomIntensity;
+			colorSum += color * strength;
+		}
+	}
+
+	colorSum /= samples;
+	gl_FragColor = min(color + colorSum, 1.0f);
+}

bluelight.frag

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+// bluelight filter for hyprland (https://github.com/hyprwm/Hyprland/issues/1140#issuecomment-1335128437) credit to https://github.com/MahouShoujoMivutilde
+
+precision mediump float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+
+const float temperature = 2600.0;
+const float temperatureStrength = 1.0;
+
+#define WithQuickAndDirtyLuminancePreservation
+const float LuminancePreservationFactor = 1.0;
+
+// function from https://www.shadertoy.com/view/4sc3D7
+// valid from 1000 to 40000 K (and additionally 0 for pure full white)
+vec3 colorTemperatureToRGB(const in float temperature){
+    // values from: http://blenderartists.org/forum/showthread.php?270332-OSL-Goodness&p=2268693&viewfull=1#post2268693
+    mat3 m = (temperature <= 6500.0) ? mat3(vec3(0.0, -2902.1955373783176, -8257.7997278925690),
+                                            vec3(0.0, 1669.5803561666639, 2575.2827530017594),
+                                            vec3(1.0, 1.3302673723350029, 1.8993753891711275)) :
+                                       mat3(vec3(1745.0425298314172, 1216.6168361476490, -8257.7997278925690),
+                                            vec3(-2666.3474220535695, -2173.1012343082230, 2575.2827530017594),
+                                            vec3(0.55995389139931482, 0.70381203140554553, 1.8993753891711275));
+    return mix(
+        clamp(vec3(m[0] / (vec3(clamp(temperature, 1000.0, 40000.0)) + m[1]) + m[2]), vec3(0.0), vec3(1.0)),
+        vec3(1.0),
+        smoothstep(1000.0, 0.0, temperature)
+    );
+}
+
+void main() {
+    vec4 pixColor = texture2D(tex, v_texcoord);
+
+    // RGB
+    vec3 color = vec3(pixColor[0], pixColor[1], pixColor[2]);
+
+#ifdef WithQuickAndDirtyLuminancePreservation
+    color *= mix(1.0,
+                 dot(color, vec3(0.2126, 0.7152, 0.0722)) / max(dot(color, vec3(0.2126, 0.7152, 0.0722)), 1e-5),
+                 LuminancePreservationFactor);
+#endif
+
+    color = mix(color, color * colorTemperatureToRGB(temperature), temperatureStrength);
+
+    vec4 outCol = vec4(color, pixColor[3]);
+
+    gl_FragColor = outCol;
+}

blur.frag

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+// blurs whole screen (https://github.com/hyprland-community/awesome-hyprland/issues/22#issuecomment-1681505196) credit to https://github.com/mekb-turtle
+#version 330 core
+
+precision mediump float;
+varying vec2 v_texcoord;
+uniform sampler2D tex;
+
+uniform int blurRadius = 1;
+
+void main() {
+	if (blurRadius <= 0) {
+		gl_FragColor = texture(tex, v_texcoord);
+		return;
+	}
+
+	vec2 invTextureSize = 1.0f / textureSize(tex, 0);
+	float invBlurRadius = 1.0f / float(blurRadius);
+
+	float samples = 0.0f;
+	vec4 colorSum = vec4(0.0f);
+
+	for (int x = -blurRadius; x <= blurRadius; ++x) {
+		for (int y = -blurRadius; y <= blurRadius; ++y) {
+			vec2 offset = vec2(x, y) * invTextureSize;
+
+			float strength = 1 - (length(offset) * invBlurRadius);
+			samples += strength;
+
+			vec2 coords = v_texcoord + offset;
+			colorSum += texture(tex, coords) * strength;
+		}
+	}
+
+	colorSum /= samples;
+	gl_FragColor = colorSum;
+}