shader3/res/shader/projector_shadow2.fs

uniform sampler2D U_ShadowMap;
uniform sampler2D U_ProjectiveTexture;
uniform sampler2D U_MainTexture;

varying vec2 V_Texcoord;
varying vec3 V_WorldPos;
varying vec4 V_ProjectCoord;
varying vec4 V_ProjectorSpaceFragPos;

float CalculateShadow(){
	vec3 fragPos = V_ProjectorSpaceFragPos.xyz / V_ProjectorSpaceFragPos.w;
	fragPos = fragPos * 0.5 + vec3(0.5);

	float depthInShadowMap = texture2D(U_ShadowMap, fragPos.xy).r;
	float currentDepth = fragPos.z;
	float shadow = (currentDepth - 0.001) > depthInShadowMap ? 1.0 : 0.0;
	return shadow;
}

void main()
{
	if(V_ProjectCoord.z > 0){
		vec4 color = textureProj(U_ProjectiveTexture, V_ProjectCoord);
		if(color.a == 0.0){
			gl_FragColor = texture2D(U_MainTexture, V_Texcoord);
		} else {
			gl_FragColor = vec4(0.0,0.0,0.0,textureProj(U_ProjectiveTexture, V_ProjectCoord).a);
		}
	} else {
		gl_FragColor = texture2D(U_MainTexture, V_Texcoord);
	}
}