Initial commit

client/shaders/shadow_shaders/pass1_trans_vertex.glsl

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+uniform mat4 LightMVP; // world matrix
+uniform vec4 CameraPos;
+varying vec4 tPos;
+#ifdef COLORED_SHADOWS
+varying vec3 varColor;
+#endif
+
+uniform float xyPerspectiveBias0;
+uniform float xyPerspectiveBias1;
+uniform float zPerspectiveBias;
+
+vec4 getRelativePosition(in vec4 position)
+{
+	vec2 l = position.xy - CameraPos.xy;
+	vec2 s = l / abs(l);
+	s = (1.0 - s * CameraPos.xy);
+	l /= s;
+	return vec4(l, s);
+}
+
+float getPerspectiveFactor(in vec4 relativePosition)
+{
+	float pDistance = length(relativePosition.xy);
+	float pFactor = pDistance * xyPerspectiveBias0 + xyPerspectiveBias1;
+	return pFactor;
+}
+
+vec4 applyPerspectiveDistortion(in vec4 position)
+{
+	vec4 l = getRelativePosition(position);
+	float pFactor = getPerspectiveFactor(l);
+	l.xy /= pFactor;
+	position.xy = l.xy * l.zw + CameraPos.xy;
+	position.z *= zPerspectiveBias;
+	return position;
+}
+
+void main()
+{
+	vec4 pos = LightMVP * gl_Vertex;
+
+	tPos = applyPerspectiveDistortion(LightMVP * gl_Vertex);
+
+	gl_Position = vec4(tPos.xyz, 1.0);
+	gl_TexCoord[0].st = gl_MultiTexCoord0.st;
+
+#ifdef COLORED_SHADOWS
+	varColor = gl_Color.rgb;
+#endif
+}