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/liquids_shader/opengl_vertex.glsl | 67 ++++++++++++++++++++----
 1 file changed, 57 insertions(+), 10 deletions(-)

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

diff --git a/client/shaders/liquids_shader/opengl_vertex.glsl b/client/shaders/liquids_shader/opengl_vertex.glsl
index e8f185825..9d64ce4e3 100644
--- a/client/shaders/liquids_shader/opengl_vertex.glsl
+++ b/client/shaders/liquids_shader/opengl_vertex.glsl
@@ -1,40 +1,84 @@
 uniform mat4 mWorldViewProj;
 uniform mat4 mInvWorld;
 uniform mat4 mTransWorld;
+uniform mat4 mWorld;
+
 uniform float dayNightRatio;
 uniform float animationTimer;
 
 uniform vec3 eyePosition;
 
 varying vec3 vPosition;
+varying vec3 worldPosition;
+
 varying vec3 eyeVec;
+varying vec3 lightVec;
+
+varying vec3 tsEyeVec;
+varying vec3 tsLightVec;
+
+const float BS = 10.0;
 
 void main(void)
 {
+	gl_TexCoord[0] = gl_MultiTexCoord0;	
+
 #ifdef ENABLE_WAVING_WATER
 	vec4 pos2 = gl_Vertex;
 	pos2.y -= 2.0;
 	pos2.y -= sin (pos2.z/WATER_WAVE_LENGTH + animationTimer * WATER_WAVE_SPEED * WATER_WAVE_LENGTH) * WATER_WAVE_HEIGHT
 		+ sin ((pos2.z/WATER_WAVE_LENGTH + animationTimer * WATER_WAVE_SPEED * WATER_WAVE_LENGTH) / 7.0) * WATER_WAVE_HEIGHT;
 	gl_Position = mWorldViewProj * pos2;
+	vPosition = gl_Position.xyz;
 #else
 	gl_Position = mWorldViewProj * gl_Vertex;
+	vPosition = gl_Position.xyz;
 #endif
 
+	worldPosition = (mWorld * gl_Vertex).xyz;
+	vec3 sunPosition = vec3 (0.0, eyePosition.y * BS + 900.0, 0.0);
+
+	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));
+		binormal = normalize(gl_NormalMatrix * vec3( 0.0, -1.0,  0.0));
+	} else if (gl_Normal.x < -0.5) {
+		// -1.0,  0.0,  0.0
+		tangent  = normalize(gl_NormalMatrix * vec3( 0.0,  0.0,  1.0));
+		binormal = normalize(gl_NormalMatrix * vec3( 0.0, -1.0,  0.0));
+	} else if (gl_Normal.y > 0.5) {
+		//  0.0,  1.0,  0.0
+		tangent  = normalize(gl_NormalMatrix * vec3( 1.0,  0.0,  0.0));
+		binormal = normalize(gl_NormalMatrix * vec3( 0.0,  0.0,  1.0));
+	} else if (gl_Normal.y < -0.5) {
+		//  0.0, -1.0,  0.0
+		tangent  = normalize(gl_NormalMatrix * vec3( 1.0,  0.0,  0.0));
+		binormal = normalize(gl_NormalMatrix * vec3( 0.0,  0.0,  1.0));
+	} else if (gl_Normal.z > 0.5) {
+		//  0.0,  0.0,  1.0
+		tangent  = normalize(gl_NormalMatrix * vec3( 1.0,  0.0,  0.0));
+		binormal = normalize(gl_NormalMatrix * vec3( 0.0, -1.0,  0.0));
+	} else if (gl_Normal.z < -0.5) {
+		//  0.0,  0.0, -1.0
+		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);
+
+	lightVec = sunPosition - worldPosition;
+	tsLightVec = lightVec * tbnMatrix;
 	eyeVec = (gl_ModelViewMatrix * gl_Vertex).xyz;
-	vPosition = (mWorldViewProj * 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;
@@ -54,10 +98,13 @@ void main(void)
 	color.r = clamp(rg,0.0,1.0);
 	color.g = clamp(rg,0.0,1.0);
 	color.b = clamp(b,0.0,1.0);
+
+	// Make sides and bottom darker than the top
+	color = color * color; // SRGB -> Linear
+	if(gl_Normal.y <= 0.5)
+		color *= 0.6;
+	color = sqrt(color); // Linear -> SRGB
 	color.a = gl_Color.a;
 
 	gl_FrontColor = gl_BackColor = color;
-
-	gl_TexCoord[0] = gl_MultiTexCoord0;
-
 }
-- 
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