Updated cgltf.

3rdparty/cgltf/cgltf_write.h

@@ -76,7 +76,8 @@ cgltf_size cgltf_write(const cgltf_options* options, char* buffer, cgltf_size si
 #define CGLTF_EXTENSION_FLAG_DRACO_MESH_COMPRESSION (1 << 4)
 #define CGLTF_EXTENSION_FLAG_MATERIALS_CLEARCOAT    (1 << 5)
 #define CGLTF_EXTENSION_FLAG_MATERIALS_IOR          (1 << 6)
-#define CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION (1 << 7)
+#define CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR     (1 << 7)
+#define CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION (1 << 8)
 
 typedef struct {
 	char* buffer;
@@ -514,6 +515,11 @@ static void cgltf_write_material(cgltf_write_context* context, const cgltf_mater
 		context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_IOR;
 	}
 
+	if (material->has_specular)
+	{
+		context->extension_flags |= CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR;
+	}
+
 	if (material->has_pbr_metallic_roughness)
 	{
 		const cgltf_pbr_metallic_roughness* params = &material->pbr_metallic_roughness;
@@ -530,7 +536,7 @@ static void cgltf_write_material(cgltf_write_context* context, const cgltf_mater
 		cgltf_write_line(context, "}");
 	}
 
-	if (material->unlit || material->has_pbr_specular_glossiness || material->has_clearcoat || material->has_ior || material->has_transmission)
+	if (material->unlit || material->has_pbr_specular_glossiness || material->has_clearcoat || material->has_ior || material->has_specular || material->has_transmission)
 	{
 		cgltf_write_line(context, "\"extensions\": {");
 		if (material->has_clearcoat)
@@ -551,6 +557,18 @@ static void cgltf_write_material(cgltf_write_context* context, const cgltf_mater
 			cgltf_write_floatprop(context, "ior", params->ior, 1.5f);
 			cgltf_write_line(context, "}");
 		}
+		if (material->has_specular)
+		{
+			const cgltf_specular* params = &material->specular;
+			cgltf_write_line(context, "\"KHR_materials_specular\": {");
+			CGLTF_WRITE_TEXTURE_INFO("specularTexture", params->specular_texture);
+			cgltf_write_floatprop(context, "specularFactor", params->specular_factor, 1.0f);
+			if (cgltf_check_floatarray(params->specular_color_factor, 3, 1.0f))
+			{
+				cgltf_write_floatarrayprop(context, "specularColorFactor", params->specular_color_factor, 3);
+			}
+			cgltf_write_line(context, "}");
+		}
 		if (material->has_transmission)
 		{
 			const cgltf_transmission* params = &material->transmission;
@@ -930,6 +948,9 @@ static void cgltf_write_extensions(cgltf_write_context* context, uint32_t extens
 	if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_IOR) {
 		cgltf_write_stritem(context, "KHR_materials_ior");
 	}
+	if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_SPECULAR) {
+		cgltf_write_stritem(context, "KHR_materials_specular");
+	}
 	if (extension_flags & CGLTF_EXTENSION_FLAG_MATERIALS_TRANSMISSION) {
 		cgltf_write_stritem(context, "KHR_materials_transmission");
 	}