From 7ac2fc94a9169dced776351ff762e94603686a96 Mon Sep 17 00:00:00 2001
From: Matei <matei@wildfiregames.com>
Date: Sun, 28 May 2006 22:00:01 +0000
Subject: [PATCH] Updates to the water shaders and a fix to stamina bar display
 on ships.

This was SVN commit r3903.
---
 .../template_unit_mechanical_ship.xml         |  4 ++
 .../data/mods/official/shaders/water_high.fs  | 37 +++++++++++--------
 .../data/mods/official/shaders/water_high.vs  |  4 +-
 3 files changed, 27 insertions(+), 18 deletions(-)

diff --git a/binaries/data/mods/official/entities/template_unit_mechanical_ship.xml b/binaries/data/mods/official/entities/template_unit_mechanical_ship.xml
index aec762cb6f..0b416d39b9 100644
--- a/binaries/data/mods/official/entities/template_unit_mechanical_ship.xml
+++ b/binaries/data/mods/official/entities/template_unit_mechanical_ship.xml
@@ -25,6 +25,10 @@
 		<Health>
 			<Bar_Height>12.0</Bar_Height>
 		</Health>
+		
+		<Stamina>
+			<Bar_Height>12.3</Bar_Height>
+		</Stamina>
 
 	</Traits>
 	
diff --git a/binaries/data/mods/official/shaders/water_high.fs b/binaries/data/mods/official/shaders/water_high.fs
index 2fc27975c5..c7325e246c 100644
--- a/binaries/data/mods/official/shaders/water_high.fs
+++ b/binaries/data/mods/official/shaders/water_high.fs
@@ -5,21 +5,24 @@ uniform vec3 cameraPos;
 uniform sampler2D normalMap;
 uniform sampler2D reflectionMap;
 uniform sampler2D refractionMap;
-uniform float shininess;
+uniform float shininess;
+uniform float waviness;
 
 varying vec3 worldPos;
 varying vec3 waterColor;
 varying float waterDepth;
-varying float w;
+varying float w;
+
+const vec3 specularColor = vec3(0.2, 0.2, 0.2);
 
 void main()
 {
-	vec3 n, l, h, v;		// normal, vector to light, half-vector and view vector (vector to eye)
+	vec3 n, l, h, v;		// Normal, light vector, half-vector and view vector (vector to eye)
 	float ndotl, ndoth, ndotv;
 	float fresnel;
-	float temp;
+	float t;
 	vec2 reflCoords, refrCoords;
-	vec3 reflCol, refrCol, specular;
+	vec3 reflColor, refrColor, specular;
 	
 	n = normalize(texture2D(normalMap, gl_TexCoord[0].st).xzy - vec3(0.5, 0.5, 0.5));
 	l = -sunDir;
@@ -30,22 +33,24 @@ void main()
 	ndoth = dot(n, h);
 	ndotv = dot(n, v);
 	
-	fresnel = pow(1.0 - ndotv, 0.8);	// A rather arbitrary Fresnel approximation
+	fresnel = pow(1.0 - ndotv, 0.8);	// A rather random Fresnel approximation
 	
-	reflCoords = 0.5 * (gl_TexCoord[1].xy / gl_TexCoord[1].w) + 0.5;
-	reflCoords += 2.9 * n.xz / w;		// The 2.9 can be tweaked to make reflections "wavier"
+	reflCoords = 0.5 * (gl_TexCoord[1].xy / gl_TexCoord[1].w) + 0.5;	// Unbias texture coords
+	reflCoords += waviness * n.xz / w;
 	
-	refrCoords = 0.5 * (gl_TexCoord[2].xy / gl_TexCoord[2].w) + 0.5;
-	refrCoords -= 2.6 * n.xz / w;		// The 2.6 can be tweaked to make refractions "wavier"
+	refrCoords = 0.5 * (gl_TexCoord[2].xy / gl_TexCoord[2].w) + 0.5;	// Unbias texture coords
+	refrCoords -= waviness * n.xz / w;
 	
-	reflCol = (0.8 + 0.2*ndotl) * texture2D(reflectionMap, reflCoords).rgb;
+	reflColor = texture2D(reflectionMap, reflCoords).rgb;
 	
-	refrCol = (ambient + ndotl * sunColor) * mix(texture2D(refractionMap, refrCoords).rgb, waterColor, 0.3);
+	refrColor = (0.5 + 0.5*ndotl) * mix(texture2D(refractionMap, refrCoords).rgb, waterColor, 0.3);
 	
-	specular = pow(max(0.0, ndoth), shininess) * sunColor * vec3(0.2, 0.2, 0.2);	// specular color can be changed here
+	specular = pow(max(0.0, ndoth), shininess) * sunColor * specularColor;
 	
-	gl_FragColor.rgb = mix(refrCol + 0.3*specular, reflCol + specular, fresnel);
+	gl_FragColor.rgb = mix(refrColor + 0.3*specular, reflColor + specular, fresnel);
 	
-	temp = 8.0 * max(0.0, 0.7-v.y);
-	gl_FragColor.a = 0.15 * waterDepth * (temp + mix(1.2, 2.2, fresnel));
+	// Make alpha vary based on both depth (so it blends with the shore) and view angle (make it
+	// become opaque faster at lower view angles so we can't look "underneath" the water plane)
+	t = 8.0 * max(0.0, 0.7 - v.y);
+	gl_FragColor.a = 0.15 * waterDepth * (1.2 + t + fresnel);
 }
diff --git a/binaries/data/mods/official/shaders/water_high.vs b/binaries/data/mods/official/shaders/water_high.vs
index 6d8667e2ea..f3749e4278 100644
--- a/binaries/data/mods/official/shaders/water_high.vs
+++ b/binaries/data/mods/official/shaders/water_high.vs
@@ -11,10 +11,10 @@ varying float w;
 void main()
 {
 	worldPos = gl_Vertex.xyz;
-	waterColor = gl_Color.xyz;
+	waterColor = gl_Color.rgb;
 	waterDepth = vertexDepth;
 	gl_TexCoord[0] = gl_MultiTexCoord0;
-	gl_TexCoord[1] = reflectionMatrix * gl_Vertex;
+	gl_TexCoord[1] = reflectionMatrix * gl_Vertex;		// projective texturing
 	gl_TexCoord[2] = reflectionMatrix * gl_Vertex;
 	w = gl_TexCoord[1].w;
     gl_Position = ftransform();