Terrain multitexturing.

2 files changed, 37 insertions, 0 deletions

diff --git a/shaders/terrain_fragment.glsl b/shaders/terrain_fragment.glsl
new file mode 100644
index 0000000..78417af
--- /dev/null
+++ b/shaders/terrain_fragment.glsl
@@ -0,0 +1,22 @@
+#version 120
+
+varying vec3 normal, light_pos;
+varying float y;
+
+uniform sampler2D tex[3];
+
+void main() {
+	vec3 n = normalize(normal);
+	float diffuse = max(dot(n, light_pos), 0.0);
+
+	float f1 = clamp((y-15.0) / 3.0, 0.0, 1.0);
+	float f2 = clamp((y-2) / 3.0, 0.0, 1.0);
+
+	vec4 t0 = texture2D(tex[0], gl_TexCoord[0].st);
+	vec4 t1 = texture2D(tex[1], gl_TexCoord[0].st);
+	vec4 t2 = texture2D(tex[2], gl_TexCoord[0].st);
+
+	gl_FragColor = mix(mix(t2, t0, f2), t1, f1) * diffuse;
+}
+
+/* vim: set syn=glsl: */
diff --git a/shaders/terrain_vertex.glsl b/shaders/terrain_vertex.glsl
new file mode 100644
index 0000000..e53c432
--- /dev/null
+++ b/shaders/terrain_vertex.glsl
@@ -0,0 +1,15 @@
+#version 120
+
+varying vec3 normal, light_pos;
+varying float y;
+
+void main() {
+	normal = gl_Normal;
+	light_pos = vec3(0, 1, 0);
+	y = gl_Vertex.y;
+
+	gl_TexCoord[0] = gl_MultiTexCoord0;
+	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
+}
+
+/* vim: set syn=glsl: */