// ----------------------------------------------------------------

// From Game Programming in C++ by Sanjay Madhav

// Copyright (C) 2017 Sanjay Madhav. All rights reserved.

//

// Released under the BSD License

// See LICENSE in root directory for full details.

// ----------------------------------------------------------------

// Request GLSL 3.3

#version 330

// Uniforms for world transform and view-proj

uniform mat4 uWorldTransform;

uniform mat4 uViewProj;

// Attribute 0 is position, 1 is normal, 2 is tex coords.

layout(location = 0) in vec3 inPosition;

layout(location = 1) in vec3 inNormal;

layout(location = 2) in vec2 inTexCoord;

// Any vertex outputs (other than position)

out vec2 fragTexCoord;

// Normal (in world space)

out vec3 fragNormal;

// Position (in world space)

out vec3 fragWorldPos;

void main()

{

// Convert position to homogeneous coordinates

vec4 pos = vec4(inPosition, 1.0);

// Transform position to world space

pos = pos * uWorldTransform;

// Save world position

fragWorldPos = pos.xyz;

// Transform to clip space

gl_Position = pos * uViewProj;

// Transform normal into world space (w = 0)

fragNormal = (vec4(inNormal, 0.0f) * uWorldTransform).xyz;

// Pass along the texture coordinate to frag shader

fragTexCoord = inTexCoord;

}