// Copyright 2017 Mark Callow
// SPDX-License-Identifier: Apache-2.0

#version 450

#extension GL_ARB_separate_shader_objects : enable
#extension GL_ARB_shading_language_420pack : enable

layout (location = 0) in vec3 inPos;
layout (location = 1) in vec2 inUV;
layout (location = 2) in vec3 inNormal;
layout (location = 3) in vec3 inColor;

layout (binding = 0) uniform UBO
{
	mat4 projection;
	mat4 model;
    mat3 normal;
	vec4 viewPos;
	float lodBias;
} ubo;

layout (location = 0) out vec2 outUV;
layout (location = 1) out float outLodBias;
layout (location = 2) out vec3 outNormal;
layout (location = 3) out vec3 outViewVec;
layout (location = 4) out vec3 outLightVec;
layout (location = 5) out vec3 outColor;

out gl_PerVertex
{
    vec4 gl_Position;
};

void main()
{
	outUV = inUV;
	outLodBias = ubo.lodBias;
	outColor = inColor;

    //vec3 worldPos = vec3(ubo.model * vec4(inPos, 1.0));

	gl_Position = ubo.projection * ubo.model * vec4(inPos.xyz, 1.0);

    vec4 pos = ubo.model * vec4(inPos, 1.0);
    //outNormal = mat3(inverse(transpose(ubo.model))) * inNormal;
    outNormal = mat3(ubo.normal) * inNormal;
	vec3 lightPos = vec3(0.0);
	vec3 lPos = mat3(ubo.model) * lightPos.xyz;
    outLightVec = lPos - pos.xyz;
    outViewVec = ubo.viewPos.xyz - pos.xyz;
}