#version 460 core
#extension GL_ARB_bindless_texture : require

layout(binding = 0) uniform uniform_per_frame
{	
	mat4 view;
	mat4 proj;	
	vec3 viewer_pos;	
	uint light_count;
} ubo_per_frame;

layout(std430, binding = 1) readonly buffer PositionsBuffer 
{
	mat4 model_matrix[];
};

layout (location = 0) in vec3 inPos; 		//12 bytes : 0
layout (location = 1) in vec2 inUV;  		//8 Bytes  : 12
layout (location = 2) in uvec3 inChunkID; 	//12 Bytes : 20
layout (location = 3) in vec3 inNormal;  	//8 Bytes  : 12 
layout (location = 4) in vec3 inBiTangent;
layout (location = 5) in vec3 inTangent;

layout(location=0) out VS_OUT
{
	vec2 vsUV;
	vec4 vsWorldPos;
	vec3 vsNormal;
	vec3 vsBiTangent;
	vec3 vsTangent;
	mat3 vsTBN;
	flat uint vsChunkID;
	flat uint vsMaterialID;
}vs_out;

void main() 
{
	uint chunkid = inChunkID[0];
	mat4 model = model_matrix[chunkid];
	mat4 view = ubo_per_frame.view;
	mat4 proj = ubo_per_frame.proj;
	//model = mat4(1);
 	gl_Position = proj * view * model * vec4(inPos, 1.0);
	vs_out.vsWorldPos =  model * vec4(inPos,1);

	vs_out.vsNormal = normalize(vec3(model * vec4(normalize(inNormal),0)));
	vs_out.vsTangent =   normalize(vec3(model *vec4(inTangent,0))) ;
	vs_out.vsBiTangent =  normalize(vec3(model *vec4(inBiTangent,0)));

	vs_out.vsTBN = mat3(vs_out.vsTangent, vs_out.vsBiTangent, vs_out.vsNormal);

	vs_out.vsUV = inUV;	
	vs_out.vsChunkID = chunkid;
	vs_out.vsMaterialID = inChunkID[1];

}