#version 320 es
/* Copyright (c) 2019-2025, Arm Limited and Contributors
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 the "License";
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

precision highp float;

layout (set=0, binding=0) uniform sampler2D base_color_texture;

layout (location = 0) in vec4 in_pos;
layout (location = 1) in vec2 in_uv;
layout (location = 2) in vec3 in_normal;

layout (location = 0) out vec4 o_albedo;
layout (location = 1) out vec4 o_normal;

layout(set = 0, binding = 1) uniform GlobalUniform {
    mat4 model;
    mat4 view_proj;
    vec3 camera_position;
} global_uniform;

layout(push_constant, std430) uniform PBRMaterialUniform {
    vec4 base_color_factor;
    float metallic_factor;
    float roughness_factor;
} pbr_material_uniform;

void main(void)
{
    vec3 normal = normalize(in_normal);
    // Transform normals from [-1, 1] to [0, 1]
    o_normal = vec4(0.5 * normal + 0.5, 1.0);

    vec4 base_color = vec4(1.0, 0.0, 0.0, 1.0);

    base_color = texture(base_color_texture, in_uv);

    o_albedo = base_color;
}