Shadow mapping render pass (#11244)

Co-authored-by: x2048 <codeforsmile@gmail.com>

client/shaders/shadow_shaders/pass1_fragment.glsl

@@ -0,0 +1,13 @@
+uniform sampler2D ColorMapSampler;
+varying vec4 tPos;
+
+void main()
+{
+	vec4 col = texture2D(ColorMapSampler, gl_TexCoord[0].st);
+
+	if (col.a < 0.70)
+		discard;
+
+	float depth = 0.5 + tPos.z * 0.5;
+	gl_FragColor = vec4(depth, 0.0, 0.0, 1.0);
+}

client/shaders/shadow_shaders/pass1_trans_fragment.glsl

@@ -0,0 +1,38 @@
+uniform sampler2D ColorMapSampler;
+varying vec4 tPos;
+
+#ifdef COLORED_SHADOWS
+// c_precision of 128 fits within 7 base-10 digits
+const float c_precision = 128.0;
+const float c_precisionp1 = c_precision + 1.0;
+
+float packColor(vec3 color)
+{
+	return floor(color.b * c_precision + 0.5)
+		+ floor(color.g * c_precision + 0.5) * c_precisionp1
+		+ floor(color.r * c_precision + 0.5) * c_precisionp1 * c_precisionp1;
+}
+
+const vec3 black = vec3(0.0);
+#endif
+
+void main()
+{
+	vec4 col = texture2D(ColorMapSampler, gl_TexCoord[0].st);
+#ifndef COLORED_SHADOWS
+	if (col.a < 0.5)
+		discard;
+#endif
+
+	float depth = 0.5 + tPos.z * 0.5;
+	// ToDo: Liso: Apply movement on waving plants
+	// depth in [0, 1] for texture
+
+	//col.rgb = col.a == 1.0 ? vec3(1.0) : col.rgb;
+#ifdef COLORED_SHADOWS
+	float packedColor = packColor(mix(col.rgb, black, col.a));
+	gl_FragColor = vec4(depth, packedColor, 0.0,1.0);
+#else
+	gl_FragColor = vec4(depth, 0.0, 0.0, 1.0);
+#endif
+}

client/shaders/shadow_shaders/pass1_trans_vertex.glsl

@@ -0,0 +1,26 @@
+uniform mat4 LightMVP; // world matrix
+varying vec4 tPos;
+
+const float bias0 = 0.9;
+const float zPersFactor = 0.5;
+const float bias1 = 1.0 - bias0 + 1e-6;
+
+vec4 getPerspectiveFactor(in vec4 shadowPosition)
+{
+	float pDistance = length(shadowPosition.xy);
+	float pFactor = pDistance * bias0 + bias1;
+	shadowPosition.xyz *= vec3(vec2(1.0 / pFactor), zPersFactor);
+
+	return shadowPosition;
+}
+
+
+void main()
+{
+	vec4 pos = LightMVP * gl_Vertex;
+
+	tPos = getPerspectiveFactor(LightMVP * gl_Vertex);
+
+	gl_Position = vec4(tPos.xyz, 1.0);
+	gl_TexCoord[0].st = gl_MultiTexCoord0.st;
+}

client/shaders/shadow_shaders/pass1_vertex.glsl

@@ -0,0 +1,26 @@
+uniform mat4 LightMVP; // world matrix
+varying vec4 tPos;
+
+const float bias0 = 0.9;
+const float zPersFactor = 0.5;
+const float bias1 = 1.0 - bias0 + 1e-6;
+
+vec4 getPerspectiveFactor(in vec4 shadowPosition)
+{
+	float pDistance = length(shadowPosition.xy);
+	float pFactor = pDistance * bias0 + bias1;
+	shadowPosition.xyz *= vec3(vec2(1.0 / pFactor), zPersFactor);
+
+	return shadowPosition;
+}
+
+
+void main()
+{
+	vec4 pos = LightMVP * gl_Vertex;
+
+	tPos = getPerspectiveFactor(pos);
+
+	gl_Position = vec4(tPos.xyz, 1.0);
+	gl_TexCoord[0].st = gl_MultiTexCoord0.st;
+}

client/shaders/shadow_shaders/pass2_fragment.glsl

@@ -0,0 +1,23 @@
+uniform sampler2D ShadowMapClientMap;
+#ifdef COLORED_SHADOWS
+uniform sampler2D ShadowMapClientMapTraslucent;
+#endif
+uniform sampler2D ShadowMapSamplerdynamic;
+
+void main() {
+
+#ifdef COLORED_SHADOWS
+	vec2 first_depth = texture2D(ShadowMapClientMap, gl_TexCoord[0].st).rg;
+	vec2 depth_splitdynamics = vec2(texture2D(ShadowMapSamplerdynamic, gl_TexCoord[2].st).r, 0.0);
+	if (first_depth.r > depth_splitdynamics.r)
+		first_depth = depth_splitdynamics;
+	vec2 depth_color = texture2D(ShadowMapClientMapTraslucent, gl_TexCoord[1].st).rg;
+	gl_FragColor = vec4(first_depth.r, first_depth.g, depth_color.r, depth_color.g);
+#else
+	float first_depth = texture2D(ShadowMapClientMap, gl_TexCoord[0].st).r;
+	float depth_splitdynamics = texture2D(ShadowMapSamplerdynamic, gl_TexCoord[2].st).r;
+	first_depth = min(first_depth, depth_splitdynamics);
+	gl_FragColor = vec4(first_depth, 0.0, 0.0, 1.0);
+#endif
+
+}

client/shaders/shadow_shaders/pass2_vertex.glsl

@@ -0,0 +1,9 @@
+
+void main()
+{
+	vec4 uv = vec4(gl_Vertex.xyz, 1.0) * 0.5 + 0.5;
+	gl_TexCoord[0] = uv;
+	gl_TexCoord[1] = uv;
+	gl_TexCoord[2] = uv;
+	gl_Position = vec4(gl_Vertex.xyz, 1.0);
+}