Switch to a deferred lighting based render pipeline

Tidy-up required.

1 files changed, 62 insertions, 0 deletions

diff --git a/gfx/gl/shaders/lightingShader.fs b/gfx/gl/shaders/lightingShader.fs
new file mode 100644
index 0000000..b0ca20a
--- /dev/null
+++ b/gfx/gl/shaders/lightingShader.fs
@@ -0,0 +1,62 @@
+#version 330 core
+#extension GL_ARB_shading_language_420pack : enable
+
+out vec3 FragColor;
+
+in vec2 TexCoords;
+
+layout(binding = 0) uniform sampler2D gPosition;
+layout(binding = 1) uniform sampler2D gNormal;
+layout(binding = 2) uniform sampler2D gAlbedoSpec;
+
+// struct Light {
+// vec3 Position;
+// vec3 Color;
+
+// float Linear;
+// float Quadratic;
+// float Radius;
+//};
+// const int NR_LIGHTS_MAX = 12;
+// uniform Light lights[NR_LIGHTS_MAX];
+// uniform vec3 viewPos;
+
+uniform vec3 lightDirection = normalize(vec3(1, 0, -1));
+uniform vec3 lightColor = vec3(0.6, 0.6, 0.6);
+uniform vec3 ambientColor = vec3(0.5, 0.5, 0.5);
+
+void
+main()
+{
+	// retrieve data from gbuffer
+	// const vec3 FragPos = texture(gPosition, TexCoords).rgb;
+	const vec3 Normal = texture(gNormal, TexCoords).rgb;
+	const vec3 Diffuse = texture(gAlbedoSpec, TexCoords).rgb;
+	// float Specular = texture(gAlbedoSpec, TexCoords).a;
+
+	// then calculate lighting as usual
+	// vec3 lighting = Diffuse;
+	const vec3 lighting = ambientColor + clamp((dot(-lightDirection, Normal) * lightColor), 0, 0.5);
+	// vec3 viewDir = normalize(viewPos - FragPos);
+	// for (int i = 0; i < NR_LIGHTS_MAX; ++i) {
+	//  calculate distance between light source and current fragment
+	// float distance = length(lights[i].Position - FragPos);
+	// if (distance < lights[i].Radius) {
+	//  diffuse
+	// vec3 lightDir = normalize(lights[i].Position - FragPos);
+	// vec3 diffuse = max(dot(Normal, lightDir), 0.0) * Diffuse * lights[i].Color;
+	//  specular
+	// vec3 halfwayDir = normalize(lightDir + viewDir);
+	// float spec = pow(max(dot(Normal, halfwayDir), 0.0), 16.0);
+	// vec3 specular = lights[i].Color * spec * Specular;
+	//  attenuation
+	// float attenuation = 1.0 / (1.0 + lights[i].Linear * distance + lights[i].Quadratic * distance * distance);
+	// diffuse *= attenuation;
+	// specular *= attenuation;
+	// lighting += diffuse + specular;
+	//}
+	//}
+	// FragColor = vec4(lighting, 1.0);
+
+	FragColor = vec3(Diffuse * lighting);
+}