#version 450

layout (location = 0) in vec3 inPos;
layout (location = 1) in vec2 inUv;
layout (location = 2) in vec3 inNormal;
layout (location = 3) in uint inId;

layout( push_constant ) uniform PushBlock {
  uint pass;
} PushConstant;

struct Matrices {
	mat4 model;
	mat4 view[2];
	mat4 projection[2];
};

layout (binding = 0) uniform UBO {
	Matrices matrices;
	vec4 color;
} ubo;

layout (location = 0) noperspective out vec2 outUv;
layout (location = 1) out vec4 outColor;
layout (location = 2) out vec3 outNormal;
layout (location = 3) out vec3 outPosition;
layout (location = 4) flat out uint outId;
layout (location = 5) out float affine;

out gl_PerVertex {
    vec4 gl_Position;   
};

vec4 snap(vec4 vertex, vec2 resolution) {
    vec4 snappedPos = vertex;
    snappedPos.xyz = vertex.xyz / vertex.w;
    snappedPos.xy = floor(resolution * snappedPos.xy) / resolution;
    snappedPos.xyz *= vertex.w;
    return snappedPos;
}

void main() {
	outUv = inUv;
	outColor = ubo.color;

	outPosition = vec3(ubo.matrices.view[PushConstant.pass] * ubo.matrices.model * vec4(inPos.xyz, 1.0));
	outNormal = vec3(ubo.matrices.view[PushConstant.pass] * ubo.matrices.model * vec4(inNormal.xyz, 0.0));
	outNormal = normalize(outNormal);

	outId = inId;

	gl_Position = ubo.matrices.projection[PushConstant.pass] * ubo.matrices.view[PushConstant.pass] * ubo.matrices.model * vec4(inPos.xyz, 1.0);
//	gl_Position = snap( gl_Position, vec2(320.0, 240.0) );
//	gl_Position = snap( gl_Position, vec2(480.0, 270.0) );
//	gl_Position = snap( gl_Position, vec2(640.0, 480.0) );

	affine = 1;
}