From 770305e28dc0ed9aea0eefe041477a46d64eee58 Mon Sep 17 00:00:00 2001
From: kwolekr <kwolekr@minetest.net>
Date: Tue, 23 Apr 2013 18:39:10 -0400
Subject: Add option to use texture alpha channel

---
 client/shaders/test_shader_3/opengl_vertex.glsl | 51 +++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 client/shaders/test_shader_3/opengl_vertex.glsl

(limited to 'client/shaders/test_shader_3/opengl_vertex.glsl')

diff --git a/client/shaders/test_shader_3/opengl_vertex.glsl b/client/shaders/test_shader_3/opengl_vertex.glsl
new file mode 100644
index 000000000..2881bad21
--- /dev/null
+++ b/client/shaders/test_shader_3/opengl_vertex.glsl
@@ -0,0 +1,51 @@
+
+uniform mat4 mWorldViewProj;
+uniform mat4 mInvWorld;
+uniform mat4 mTransWorld;
+uniform float dayNightRatio;
+
+varying vec3 vPosition;
+
+void main(void)
+{
+	gl_Position = mWorldViewProj * gl_Vertex;
+
+	vPosition = (mWorldViewProj * gl_Vertex).xyz;
+
+	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 * 1.0; // Make light sources brighter
+	float b = rg;
+
+	// Moonlight is blue
+	b += (day - night) / 13.0;
+	rg -= (day - night) / 13.0;
+
+	// Emphase blue a bit in darker places
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	b += max(0.0, (1.0 - abs(b - 0.13)/0.17) * 0.025);
+
+	// Artificial light is yellow-ish
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	rg += max(0.0, (1.0 - abs(rg - 0.85)/0.15) * 0.065);
+
+	color.r = rg;
+	color.g = rg;
+	color.b = b;
+
+	color.a = gl_Color.a;
+
+	gl_FrontColor = gl_BackColor = color;
+
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+}
-- 
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