shader3/res/shader/projector.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){
		float shadow = CalculateShadow();
		gl_FragColor = 0.5*texture2D(U_MainTexture, V_Texcoord) + textureProj(U_ProjectiveTexture, V_ProjectCoord) * 0.5 *vec4(1.0 - shadow);
	} else {
		gl_FragColor = texture2D(U_MainTexture, V_Texcoord);
	}
}