panorama_sky.gdshader

shader_type sky;

uniform sampler2D skyTexture:source_color;

void sky() {
	COLOR = textureLod(skyTexture, SKY_COORDS, 0.0).rgb;
}

panorama_spatial_sky.gdshader

shader_type spatial;
render_mode unshaded;

uniform sampler2D skyTexture:source_color;

vec2 view_dir_to_equirectangular(vec3 view_dir) {
	float y = 0.5 - (atan(view_dir.y, length(view_dir.xz)) / 3.14159);
	//float y = 0.5-view_dir.y*0.5;
	float x = -atan(view_dir.x, view_dir.z) / (3.14159 * 2.0) + 0.5;
	return vec2(x, y);
}

varying vec3 world_position;

void vertex()
{
    world_position = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
}

void fragment() {
	vec3 view_dir = normalize(world_position - CAMERA_POSITION_WORLD);
	vec2 sky_coords = view_dir_to_equirectangular(view_dir);
	ALBEDO = textureLod(skyTexture, sky_coords, 0.0).rgb;
}