Add support for projectors in spot and omni lights.

1 files changed, 28 insertions, 0 deletions

diff --git a/servers/rendering/rasterizer_rd/shaders/copy_to_fb.glsl b/servers/rendering/rasterizer_rd/shaders/copy_to_fb.glsl
index 0f8688ee34..07f8d09743 100644
--- a/servers/rendering/rasterizer_rd/shaders/copy_to_fb.glsl
+++ b/servers/rendering/rasterizer_rd/shaders/copy_to_fb.glsl
@@ -65,6 +65,34 @@ layout(location = 0) out vec4 frag_color;
 void main() {
 
 	vec2 uv = uv_interp;
+
+#ifdef MODE_PANORAMA_TO_DP
+
+	//obtain normal from dual paraboloid uv
+#define M_PI 3.14159265359
+
+	float side;
+	uv.y = modf(uv.y * 2.0, side);
+	side = side * 2.0 - 1.0;
+	vec3 normal = vec3(uv * 2.0 - 1.0, 0.0);
+	normal.z = 0.5 - 0.5 * ((normal.x * normal.x) + (normal.y * normal.y));
+	normal *= -side;
+	normal = normalize(normal);
+
+	//now convert normal to panorama uv
+
+	vec2 st = vec2(atan(normal.x, normal.z), acos(normal.y));
+
+	if (st.x < 0.0)
+		st.x += M_PI * 2.0;
+
+	uv = st / vec2(M_PI * 2.0, M_PI);
+
+	if (side < 0.0) {
+		//uv.y = 1.0 - uv.y;
+		uv = 1.0 - uv;
+	}
+#endif
 	vec4 color = textureLod(source_color, uv, 0.0);
 	if (params.force_luminance) {
 		color.rgb = vec3(max(max(color.r, color.g), color.b));