Custom land and water shaders

Create sandy beaches, snow topped mountains and grassy hills with a single texture, coloured
according to land height by a custom shader.
Also use the land mass mesh with a new water texture and a custom shader to create rather nice
looking water effect with depth, waves and motion.

1 files changed, 41 insertions, 0 deletions

diff --git a/gfx/gl/shaders/landmassShader.fs b/gfx/gl/shaders/landmassShader.fs
new file mode 100644
index 0000000..36cc971
--- /dev/null
+++ b/gfx/gl/shaders/landmassShader.fs
@@ -0,0 +1,41 @@
+#version 130

+

+in vec2 texCoord0;

+in vec3 normal0;

+in float height;

+

+uniform sampler2D sampler;

+uniform vec3 lightDirection;

+uniform vec3 lightColor;

+uniform vec3 ambientColor;

+

+const vec3 grass = vec3(.1, .4, .05);

+const vec3 sand = vec3(.76, .7, .5);

+const vec3 snow = vec3(.97, .97, .99);

+

+vec2

+grad_between(float x, float lower, float upper)

+{

+	float off = (x - lower) / (upper - lower);

+	return vec2(off, 1 - off);

+}

+

+void

+main()

+{

+	gl_FragColor = texture(sampler, texCoord0);

+	gl_FragColor.xyz *= clamp(ambientColor + (dot(-lightDirection, normal0) * lightColor), 0.0, 1.0);

+	if (height < 0.5) {

+		gl_FragColor.rgb *= sand;

+	}

+	else if (height > 30) {

+		gl_FragColor.rgb *= snow;

+	}

+	else if (height > 28) {

+		vec2 grad = grad_between(height, 28, 30);

+		gl_FragColor.rgb *= grass + (snow - grass) * grad.x;

+	}

+	else {

+		gl_FragColor.rgb *= grass;

+	}

+}