From d8c0bee891a9bc30bebcd5682bdba4d5b21cfd5b Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 20 Feb 2021 01:01:42 +0000
Subject: Remove spare bits from shaders and tidy up

---
 gfx/gl/shaders/basicShader.fs    |  2 +-
 gfx/gl/shaders/landmassShader.fs | 20 ++++++++------------
 gfx/gl/shaders/landmassShader.vs |  4 +---
 gfx/gl/shaders/waterShader.vs    |  7 +++----
 4 files changed, 13 insertions(+), 20 deletions(-)

(limited to 'gfx/gl')

diff --git a/gfx/gl/shaders/basicShader.fs b/gfx/gl/shaders/basicShader.fs
index b6c011d..fe9a6b3 100644
--- a/gfx/gl/shaders/basicShader.fs
+++ b/gfx/gl/shaders/basicShader.fs
@@ -11,5 +11,5 @@ uniform vec3 ambientColor;
 void main()
 {
 	gl_FragColor = texture(sampler, texCoord0);
-	gl_FragColor.xyz *= clamp(ambientColor + (dot(-lightDirection, normal0) * lightColor), 0.0, 1.0);
+	gl_FragColor.rgb *= clamp(ambientColor + (dot(-lightDirection, normal0) * lightColor), 0.0, 1.0);
 }
diff --git a/gfx/gl/shaders/landmassShader.fs b/gfx/gl/shaders/landmassShader.fs
index 36cc971..55c30ac 100644
--- a/gfx/gl/shaders/landmassShader.fs
+++ b/gfx/gl/shaders/landmassShader.fs
@@ -13,27 +13,23 @@ 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);
-}
+const float beachline = .5;
+const float snowline_low = 28;
+const float snowline_high = 30;
 
 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 *= clamp(ambientColor + (dot(-lightDirection, normal0) * lightColor), 0.0, 1.0);
+	if (height < beachline) {
 		gl_FragColor.rgb *= sand;
 	}
-	else if (height > 30) {
+	else if (height > snowline_high) {
 		gl_FragColor.rgb *= snow;
 	}
-	else if (height > 28) {
-		vec2 grad = grad_between(height, 28, 30);
-		gl_FragColor.rgb *= grass + (snow - grass) * grad.x;
+	else if (height > snowline_low) {
+		gl_FragColor.rgb *= mix(grass, snow, (height - snowline_low) / (snowline_high - snowline_low));
 	}
 	else {
 		gl_FragColor.rgb *= grass;
diff --git a/gfx/gl/shaders/landmassShader.vs b/gfx/gl/shaders/landmassShader.vs
index 72c9060..dc92e95 100644
--- a/gfx/gl/shaders/landmassShader.vs
+++ b/gfx/gl/shaders/landmassShader.vs
@@ -9,12 +9,10 @@ out vec3 normal0;
 out float height;
 
 uniform mat4 viewProjection;
-uniform mat4 model;
-uniform vec3 waves;
 
 void main()
 {
-	gl_Position = viewProjection * model * vec4(position, 1.0);
+	gl_Position = viewProjection * vec4(position, 1.0);
 	texCoord0 = texCoord;
 	normal0 = normal;
 	height = position.y;
diff --git a/gfx/gl/shaders/waterShader.vs b/gfx/gl/shaders/waterShader.vs
index 55a0fb8..2efff85 100644
--- a/gfx/gl/shaders/waterShader.vs
+++ b/gfx/gl/shaders/waterShader.vs
@@ -8,16 +8,15 @@ out vec2 texCoord0;
 out float depth;
 
 uniform mat4 viewProjection;
-uniform mat4 model;
 uniform vec3 waves;
 
 void main()
 {
 	vec3 wpos = vec3(
 			position.x + cos(waves.x),
-			cos(waves.x + position.x + (position.z / 7)) * .3,
-			position.z + cos(waves.x * waves.z));
-	gl_Position = viewProjection * model * vec4(wpos, 1.0);
+			cos(waves.x + position.x + (position.z / 8)) * .3,
+			position.z + cos(waves.x * waves.z / 2));
+	gl_Position = viewProjection * vec4(wpos, 1.0);
 	texCoord0 = texCoord;
 	depth = position.y;
 }
-- 
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