1 files changed, 29 insertions, 0 deletions
diff --git a/gfx/gl/shaders/pointLight.frag b/gfx/gl/shaders/pointLight.frag
new file mode 100644
index 0000000..bb2c453
--- /dev/null
+++ b/gfx/gl/shaders/pointLight.frag
@@ -0,0 +1,29 @@
+#version 460 core
+
+out vec3 FragColor;
+
+layout(binding = 0) uniform isampler2D gPosition;
+layout(binding = 1) uniform sampler2D gNormal;
+uniform ivec4 viewPort;
+flat in vec4 geo_centre;
+flat in vec3 geo_colour;
+flat in float geo_kq;
+
+void
+main()
+{
+	const vec2 texCoord = gl_FragCoord.xy / viewPort.zw;
+	const vec3 position = texture(gPosition, texCoord).xyz;
+	const vec3 lightv = position - geo_centre.xyz;
+	const float lightDist = length(lightv);
+	if (lightDist > geo_centre.w) {
+		discard;
+	}
+	const vec3 normal = texture(gNormal, texCoord).xyz;
+	const vec3 lightDirection = normalize(lightv);
+	const float normalDot = dot(-lightDirection, normal);
+	if (normalDot < 0) {
+		discard;
+	}
+	FragColor = (geo_colour * normalDot) / (1 + (geo_kq * pow(lightDist / 1000.0, 2)));
+}