Pixel-Composer/build/Windows/0/cache/sh_d3d_background.shader

//
// Simple passthrough vertex shader
//
attribute vec3 in_Position;                  // (x,y,z)
attribute vec3 in_Normal;                  // (x,y,z)     unused in this shader.
attribute vec4 in_Colour;                    // (r,g,b,a)
attribute vec2 in_TextureCoord;              // (u,v)

varying vec2 v_vTexcoord;
varying vec4 v_vColour;
varying vec4 v_worldPosition;

void main() {
    vec4 object_space_pos = vec4( in_Position.x, in_Position.y, in_Position.z, 1.0);
    gl_Position = gm_Matrices[MATRIX_WORLD_VIEW_PROJECTION] * object_space_pos;
    
    v_vColour		= in_Colour;
    v_vTexcoord		= in_TextureCoord;
	v_worldPosition = gm_Matrices[MATRIX_WORLD] * object_space_pos;
}

//######################_==_YOYO_SHADER_MARKER_==_######################@~
//
// Simple passthrough fragment shader
//
varying vec2 v_vTexcoord;
varying vec4 v_vColour;
varying vec4 v_worldPosition;

#define PI  3.14159265359
#define TAU 6.28318530718

uniform vec4	  light_ambient;
uniform vec3	  cameraPosition;
uniform int       env_use_mapping;
uniform sampler2D env_map;
uniform vec2      env_map_dimension;

vec2 equirectangularUv(vec3 dir) {
	vec3 n = normalize(dir);
	return vec2((atan(n.x, n.y) / TAU) + 0.5, 1. - acos(n.z) / PI);
}
	
void main() {
	if(env_use_mapping == 1) {
		vec3  viewDirection = normalize(cameraPosition - v_worldPosition.xyz);
		vec2  viewSample    = equirectangularUv(viewDirection);
		gl_FragColor = light_ambient * texture2D(env_map, viewSample);
	} else 
		gl_FragColor = light_ambient;
}