From 0dc1aec50940140e28f434c524296e284e73d623 Mon Sep 17 00:00:00 2001
From: RealBadAngel <maciej.kasatkin@yahoo.com>
Date: Fri, 21 Mar 2014 01:32:00 +0100
Subject: Normal maps generation on the fly. Parallax mapping with slope
 information. Overriding normal maps.

---
 client/shaders/alpha_shader/opengl_vertex.glsl | 38 ++++++++++++--------------
 1 file changed, 17 insertions(+), 21 deletions(-)

(limited to 'client/shaders/alpha_shader/opengl_vertex.glsl')

diff --git a/client/shaders/alpha_shader/opengl_vertex.glsl b/client/shaders/alpha_shader/opengl_vertex.glsl
index e359955d0..356ba2eb9 100644
--- a/client/shaders/alpha_shader/opengl_vertex.glsl
+++ b/client/shaders/alpha_shader/opengl_vertex.glsl
@@ -1,27 +1,33 @@
 uniform mat4 mWorldViewProj;
 uniform mat4 mInvWorld;
 uniform mat4 mTransWorld;
+uniform mat4 mWorld;
+
 uniform float dayNightRatio;
 
 uniform vec3 eyePosition;
 
 varying vec3 vPosition;
+varying vec3 worldPosition;
+
 varying vec3 eyeVec;
+varying vec3 lightVec;
 
-#ifdef ENABLE_PARALLAX_OCCLUSION
 varying vec3 tsEyeVec;
-#endif
+varying vec3 tsLightVec;
+
+const float BS = 10.0;
 
 void main(void)
 {
+	gl_TexCoord[0] = gl_MultiTexCoord0;
 	gl_Position = mWorldViewProj * gl_Vertex;
-	vPosition = (mWorldViewProj * gl_Vertex).xyz;
-	eyeVec = (gl_ModelViewMatrix * gl_Vertex).xyz;
+	vPosition = gl_Position.xyz;
+	worldPosition = (mWorld * gl_Vertex).xyz;
+	vec3 sunPosition = vec3 (0.0, eyePosition.y * BS + 900.0, 0.0);
 
-#ifdef ENABLE_PARALLAX_OCCLUSION
-	vec3 normal,tangent,binormal;
+	vec3 normal, tangent, binormal;
 	normal = normalize(gl_NormalMatrix * gl_Normal);
-
 	if (gl_Normal.x > 0.5) {
 		//  1.0,  0.0,  0.0
 		tangent  = normalize(gl_NormalMatrix * vec3( 0.0,  0.0, -1.0));
@@ -47,25 +53,20 @@ void main(void)
 		tangent  = normalize(gl_NormalMatrix * vec3(-1.0,  0.0,  0.0));
 		binormal = normalize(gl_NormalMatrix * vec3( 0.0, -1.0,  0.0));
 	}
-
 	mat3 tbnMatrix = mat3(	tangent.x, binormal.x, normal.x,
 							tangent.y, binormal.y, normal.y,
 							tangent.z, binormal.z, normal.z);
 
-	tsEyeVec = normalize(eyeVec * tbnMatrix);
-#endif
+	lightVec = sunPosition - worldPosition;
+	tsLightVec = lightVec * tbnMatrix;
+	eyeVec = (gl_ModelViewMatrix * gl_Vertex).xyz;
+	tsEyeVec = eyeVec * tbnMatrix;
 
 	vec4 color;
-	//color = vec4(1.0, 1.0, 1.0, 1.0);
-
 	float day = gl_Color.r;
 	float night = gl_Color.g;
 	float light_source = gl_Color.b;
 
-	/*color.r = mix(night, day, dayNightRatio);
-	color.g = color.r;
-	color.b = color.r;*/
-
 	float rg = mix(night, day, dayNightRatio);
 	rg += light_source * 2.5; // Make light sources brighter
 	float b = rg;
@@ -90,13 +91,8 @@ void main(void)
 	color = color * color; // SRGB -> Linear
 	if(gl_Normal.y <= 0.5)
 		color *= 0.6;
-		//color *= 0.7;
 	color = sqrt(color); // Linear -> SRGB
-
 	color.a = gl_Color.a;
 
 	gl_FrontColor = gl_BackColor = color;
-
-	gl_TexCoord[0] = gl_MultiTexCoord0;
-
 }
-- 
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