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shaders/geometry.frag

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+#version 330 core
+layout (location = 0) out vec3 gPosition;
+layout (location = 1) out vec3 gNormal;
+layout (location = 2) out vec4 gAlbedo;   // linear rgb + alpha
+layout (location = 3) out vec4 gMaterial; // r = metallic, g = roughness, b = ao, a = emissive
+
+in vec3 FragPos;
+in vec3 Normal;
+in vec2 TexCoord;
+
+uniform sampler2D tex;
+uniform vec4 colorOverride = vec4(0.0);
+uniform int useTexture = 0;
+uniform float metallic = 0.0;
+uniform float roughness = 0.7;
+uniform float ao = 1.0;
+uniform float emissive = 0.0;
+
+void main()
+{
+    vec4 albedo = vec4(0.8, 0.8, 0.8, 1.0);
+    if (useTexture != 0) {
+        albedo = texture(tex, TexCoord);
+        if (albedo.a < 0.1)
+            discard;
+        albedo.rgb = albedo.rgb * albedo.rgb;   // same cheap 2.2 stand-in as the lighting shaders
+    }
+
+    albedo.rgb = mix(albedo.rgb, colorOverride.rgb, colorOverride.w);
+
+    gPosition = FragPos;
+    gNormal   = normalize(Normal);
+    gAlbedo   = albedo;
+    gMaterial = vec4(clamp(metallic, 0.0, 1.0), clamp(roughness, 0.04, 1.0), ao, clamp(emissive, 0.0, 1.0));
+}