From 48ec3a869029bad34773516df193519a4fe9103a Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 15 Apr 2023 00:08:20 +0100
Subject: Rename lots of shader files

Names and paths still not perfect, but better and the weird name missuse is gone
---
 gfx/gl/shaders/landmass.fs | 66 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 gfx/gl/shaders/landmass.fs

(limited to 'gfx/gl/shaders/landmass.fs')

diff --git a/gfx/gl/shaders/landmass.fs b/gfx/gl/shaders/landmass.fs
new file mode 100644
index 0000000..4dc92bb
--- /dev/null
+++ b/gfx/gl/shaders/landmass.fs
@@ -0,0 +1,66 @@
+#version 330 core
+
+include(`materialInterface.glsl')
+include(`materialOut.glsl')
+
+uniform sampler2D texture0;
+
+const vec3 grass = vec3(.1, .4, .05);
+const vec3 slope = vec3(.6, .6, .4);
+const vec3 rock = vec3(.2, .2, .1);
+const vec3 sand = vec3(.76, .7, .5);
+const vec3 snow = vec3(.97, .97, .99);
+
+const float beachline = .5;
+const float snowline_low = 28;
+const float snowline_high = 30;
+
+const float slope_min = .99;
+const float slope_mid = .95;
+const float slope_max = .90;
+
+vec3
+mixBetween(vec3 colA, vec3 colB, float blend, float low, float high)
+{
+	return mix(colA, colB, (blend - low) / (high - low));
+}
+
+void
+main()
+{
+	vec3 color = texture(texture0, TexCoords).rgb;
+
+	float height = FragPos.z;
+	if (height < beachline) { // Sandy beach
+		color *= sand;
+	}
+	else if (Normal.z < slope_max) { // Dark rocky face
+		color *= rock;
+	}
+	else { // Colour by lesser slope
+		if (Normal.z < slope_mid) {
+			color *= mixBetween(rock, slope, Normal.z, slope_max, slope_mid);
+		}
+		else if (Normal.z < slope_min) {
+			color *= mixBetween(slope, grass, Normal.z, slope_mid, slope_min);
+		}
+		else {
+			color *= grass;
+		}
+
+		// Add a snow covering
+		if (height > snowline_low) {
+			vec3 tsnow = color * snow;
+			if (height > snowline_high) {
+				color = tsnow;
+			}
+			else {
+				color = mixBetween(color, tsnow, height, snowline_low, snowline_high);
+			}
+		}
+	}
+
+	gPosition = vec4(FragPos, 1);
+	gNormal = vec4(Normal, 1);
+	gAlbedoSpec = vec4(color, 1);
+}
-- 
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