1 files changed, 98 insertions, 0 deletions
diff --git a/src/rend2/glsl/pshadow_fp.glsl b/src/rend2/glsl/pshadow_fp.glsl
new file mode 100644
index 00000000..b152971a
--- /dev/null
+++ b/src/rend2/glsl/pshadow_fp.glsl
@@ -0,0 +1,98 @@
+uniform sampler2D u_ShadowMap;
+
+uniform vec3      u_LightForward;
+uniform vec3      u_LightUp;
+uniform vec3      u_LightRight;
+uniform vec4      u_LightOrigin;
+uniform float     u_LightRadius;
+varying vec3      var_Position;
+varying vec3      var_Normal;
+
+float sampleDistMap(sampler2D texMap, vec2 uv, float scale)
+{
+	vec3 distv = texture2D(texMap, uv).xyz;
+	return dot(distv, vec3(1.0 / (256.0 * 256.0), 1.0 / 256.0, 1.0)) * scale;
+}
+
+void main()
+{
+	vec3 lightToPos = var_Position - u_LightOrigin.xyz;
+	vec2 st = vec2(-dot(u_LightRight, lightToPos), dot(u_LightUp, lightToPos));
+	
+	float fade = length(st);
+	
+#if defined(USE_DISCARD)
+	if (fade >= 1.0)
+	{
+		discard;
+	}
+#endif
+
+	fade = clamp(8.0 - fade * 8.0, 0.0, 1.0);
+	
+	st = st * 0.5 + vec2(0.5);
+
+#if defined(USE_SOLID_PSHADOWS)
+	float intensity = max(sign(u_LightRadius - length(lightToPos)), 0.0);
+#else
+	float intensity = clamp((1.0 - dot(lightToPos, lightToPos) / (u_LightRadius * u_LightRadius)) * 2.0, 0.0, 1.0);
+#endif
+	
+	float lightDist = length(lightToPos);
+	float dist;
+
+#if defined(USE_DISCARD)
+	if (dot(u_LightForward, lightToPos) <= 0.0)
+	{
+		discard;
+	}
+
+	if (dot(var_Normal, lightToPos) > 0.0)
+	{
+		discard;
+	}
+#else
+	intensity *= max(sign(dot(u_LightForward, lightToPos)), 0.0);
+	intensity *= max(sign(-dot(var_Normal, lightToPos)), 0.0);
+#endif
+
+	intensity *= fade;
+#if defined(USE_PCF)
+	float part;
+	
+	dist = sampleDistMap(u_ShadowMap, st + vec2(-1.0/512.0, -1.0/512.0), u_LightRadius);
+	part =  max(sign(lightDist - dist), 0.0);
+
+	dist = sampleDistMap(u_ShadowMap, st + vec2( 1.0/512.0, -1.0/512.0), u_LightRadius);
+	part += max(sign(lightDist - dist), 0.0);
+
+	dist = sampleDistMap(u_ShadowMap, st + vec2(-1.0/512.0,  1.0/512.0), u_LightRadius);
+	part += max(sign(lightDist - dist), 0.0);
+
+	dist = sampleDistMap(u_ShadowMap, st + vec2( 1.0/512.0,  1.0/512.0), u_LightRadius);
+	part += max(sign(lightDist - dist), 0.0);
+
+  #if defined(USE_DISCARD)
+	if (part <= 0.0)
+	{
+		discard;
+	}
+  #endif
+
+	intensity *= part * 0.25;
+#else
+	dist = sampleDistMap(u_ShadowMap, st, u_LightRadius);
+
+  #if defined(USE_DISCARD)
+	if (lightDist - dist <= 0.0)
+	{
+		discard;
+	}
+  #endif
+			
+	intensity *= max(sign(lightDist - dist), 0.0);
+#endif
+		
+	gl_FragColor.rgb = vec3(0);
+	gl_FragColor.a = clamp(intensity, 0.0, 0.75);
+}