Add simple debug interface

Fixes #96

hotham/src/resources/vulkan_context.rs

@@ -1082,12 +1082,22 @@ fn vulkan_init_legacy(
             .application_name(&app_name)
             .api_version(vk::make_api_version(0, 1, 2, 0));
 
+        let validation_features_enables = [
+            // vk::ValidationFeatureEnableEXT::BEST_PRACTICES,
+        ];
+        let validation_features_disables = [];
+        let mut validation_features = vk::ValidationFeaturesEXT::builder()
+            .enabled_validation_features(&validation_features_enables)
+            .disabled_validation_features(&validation_features_disables);
+
+        // TODO: Disable validation in release
         let instance = entry
             .create_instance(
                 &vk::InstanceCreateInfo::builder()
                     .application_info(&app_info)
                     .enabled_extension_names(&vk_instance_ext_ptrs)
-                    .enabled_layer_names(&layer_names),
+                    .enabled_layer_names(&layer_names)
+                    .push_next(&mut validation_features),
                 None,
             )
             .expect("Vulkan error creating Vulkan instance");

hotham/src/shaders/pbr.frag

@@ -354,6 +354,37 @@ void main()
 	outColor = vec4(color, baseColor.a);
 
 	// Debugging
+
+	// Shader inputs debug visualization
+	// "none", "Base Color Texture", "Normal Texture", "Occlusion Texture", "Emissive Texture", "Metalic (?)", "Roughness (?)"
+	if (uboParams.debugViewInputs > 0.0) {
+		int index = int(uboParams.debugViewInputs);
+		switch (index) {
+			case 1:
+				outColor.rgba = material.baseColorTextureSet > -1 ? texture(colorMap, material.baseColorTextureSet == 0 ? inUV0 : inUV1) : vec4(1.0f);
+				break;
+			case 2:
+				outColor.rgb = (material.normalTextureSet > -1) ? texture(normalMap, material.normalTextureSet == 0 ? inUV0 : inUV1).rgb : normalize(inNormal);
+				break;
+			case 3:
+				outColor.rgb = (material.occlusionTextureSet > -1) ? texture(aoMap, material.occlusionTextureSet == 0 ? inUV0 : inUV1).rrr : vec3(0.0f);
+				break;
+			case 4:
+				outColor.rgb = (material.emissiveTextureSet > -1) ? texture(emissiveMap, material.emissiveTextureSet == 0 ? inUV0 : inUV1).rgb : vec3(0.0f);
+				break;
+			case 5:
+				outColor.rgb = texture(physicalDescriptorMap, inUV0).bbb;
+				break;
+			case 6:
+				outColor.rgb = texture(physicalDescriptorMap, inUV0).ggg;
+				break;
+			case 7:
+				outColor.rgba = material.baseColorTextureSet > -1 ? texture(colorMap, material.baseColorTextureSet == 0 ? inUV0 : inUV1) * material.baseColorFactor: vec4(1.0f);
+				break;
+		}
+		outColor = SRGBtoLINEAR(outColor);
+	}
+
 	// "none", "Diff (l,n)", "F (l,h)", "G (l,v,h)", "D (h)", "Specular"
 	if (uboParams.debugViewEquation > 0.0) {
 		int index = int(uboParams.debugViewEquation);
@@ -375,4 +406,5 @@ void main()
 				break;				
 		}
 	}
+
 }