From 2330267d2207208799ad347ea0d129c0b4551d61 Mon Sep 17 00:00:00 2001
From: RealBadAngel <mk@realbadangel.pl>
Date: Tue, 3 Dec 2013 17:21:40 +0100
Subject: Shaders rework.

---
 client/shaders/alpha_shader/opengl_fragment.glsl | 67 ++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 client/shaders/alpha_shader/opengl_fragment.glsl

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

diff --git a/client/shaders/alpha_shader/opengl_fragment.glsl b/client/shaders/alpha_shader/opengl_fragment.glsl
new file mode 100644
index 000000000..e72c1b9a6
--- /dev/null
+++ b/client/shaders/alpha_shader/opengl_fragment.glsl
@@ -0,0 +1,67 @@
+#version 120
+
+uniform sampler2D baseTexture;
+uniform sampler2D normalTexture;
+uniform sampler2D useNormalmap;
+
+uniform float enableBumpmapping;
+uniform float enableParallaxOcclusion;
+uniform float parallaxOcclusionScale;
+uniform float parallaxOcclusionBias;
+
+
+uniform vec4 skyBgColor;
+uniform float fogDistance;
+
+varying vec3 vPosition;
+varying vec3 tsEyeVec;
+varying vec3 eyeVec;
+
+const float e = 2.718281828459;
+
+void main (void)
+{
+	float use_normalmap = texture2D(useNormalmap,vec2(1.0,1.0)).r;
+	float enable_bumpmapping = enableBumpmapping;
+
+	vec3 color;
+	vec2 uv = gl_TexCoord[0].st;
+	float height;
+	vec2 tsEye = vec2(tsEyeVec.x,-tsEyeVec.y);
+	
+	if ((enableParallaxOcclusion == 1.0) && (use_normalmap > 0.0)) {
+		float map_height = texture2D(normalTexture, uv).a;
+			if (map_height < 1.0){
+				float height = parallaxOcclusionScale * map_height - parallaxOcclusionBias;
+				uv = uv + height * tsEye;
+			}
+	}
+
+	if ((enable_bumpmapping == 1.0) && (use_normalmap > 0.0)) {
+		vec3 base = texture2D(baseTexture, uv).rgb;
+		vec3 vVec = normalize(eyeVec);
+		vec3 bump = normalize(texture2D(normalTexture, uv).xyz * 2.0 - 1.0);
+		vec3 R = reflect(-vVec, bump);
+		vec3 lVec = normalize(vVec);
+		float diffuse = max(dot(lVec, bump), 0.0);
+		float specular = pow(clamp(dot(R, lVec), 0.0, 1.0),1.0);
+		color = mix (base,diffuse*base,1.0) + 0.1 * specular * diffuse;
+	} else {
+		color = texture2D(baseTexture, uv).rgb;
+	}
+
+	float alpha = texture2D(baseTexture, uv).a;
+	vec4 col = vec4(color.r, color.g, color.b, alpha);
+	col *= gl_Color;
+	col = col * col; // SRGB -> Linear
+	col *= 1.8;
+	col.r = 1.0 - exp(1.0 - col.r) / e;
+	col.g = 1.0 - exp(1.0 - col.g) / e;
+	col.b = 1.0 - exp(1.0 - col.b) / e;
+	col = sqrt(col); // Linear -> SRGB
+	if(fogDistance != 0.0){
+		float d = max(0.0, min(vPosition.z / fogDistance * 1.5 - 0.6, 1.0));
+		col = mix(col, skyBgColor, d);
+	}
+    gl_FragColor = vec4(col.r, col.g, col.b, alpha);   
+}
-- 
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