Fix a few GLSL errors as reported by glslangValidator

Shaders/birds-ALS.frag

@@ -196,7 +196,7 @@ if ((domain_x < 0.1) || (domain_x > 0.9)) {shapeTexel.a = 0.0;}
 domainTexel.rgb *=  color_base.rgb;
 
 vec4 birdTexel;
-birdTexel.rgb = domainTexel.rgb * light_diffuse;
+birdTexel.rgb = domainTexel.rgb * light_diffuse.rgb;
 birdTexel.a = domainTexel.a * shapeTexel.a * transmission;
 
 

Shaders/landmass.geom

@@ -1,4 +1,4 @@
-#version 120
+#version 150
 #extension GL_EXT_geometry_shader4 : enable
 
 // Geometry shader that creates a prism from a terrain triangle,
@@ -7,28 +7,28 @@
 // A geometry shader should do as little computation as possible.
 
 // See landmass-g.vert for a description of the inputs.
-varying in vec4 rawposIn[3];
-varying in vec3 NormalIn[3];
-varying in vec4 ecPosIn[3];
-varying in vec3 ecNormalIn[3];
-varying in vec3 VTangentIn[3];
-varying in vec3 VBinormalIn[3];
-varying in vec4 constantColorIn[3];
+in vec4 rawposIn[3];
+in vec3 NormalIn[3];
+in vec4 ecPosIn[3];
+in vec3 ecNormalIn[3];
+in vec3 VTangentIn[3];
+in vec3 VBinormalIn[3];
+in vec4 constantColorIn[3];
 
 uniform float canopy_height;
 
 // model position
-varying out vec4 rawpos;
+out vec4 rawpos;
 // eye position
-varying out vec4 ecPosition;
+out vec4 ecPosition;
 // eye space surface matrix
-varying out vec3 VNormal;
-varying out vec3 VTangent;
-varying out vec3 VBinormal;
+out vec3 VNormal;
+out vec3 VTangent;
+out vec3 VBinormal;
 // model normal
-varying out vec3 Normal;
-varying out vec4 constantColor;
-varying out float bump;
+out vec3 Normal;
+out vec4 constantColor;
+out float bump;
 
 // Emit one vertex of the forest geometry.
 // parameters:

Shaders/night-vision.frag

@@ -37,6 +37,6 @@ void main() {
 	c = c * vec2( 1.0, fg_BufferSize.y / fg_BufferSize.x );
 	float l = length(c);
 	float f = smoothstep( 0.7, 1.1, l );
-	color.rgb = (1 - f) * color.rgb;
+	color.rgb = (1.0 - f) * color.rgb;
     gl_FragColor = color;
 }

Shaders/rain-layer-ALS.frag

@@ -54,7 +54,7 @@ void main(void)
 	fragColor.rgb = mix(hazeColor, finalColor.rgb, fogFactor );
 	}
       else 
-	{fragColor.rgb = finalColor;}
+	{fragColor.rgb = finalColor.rgb;}
       fragColor.a = mix(0.0, finalColor.a, fogFactor);
 
       fragColor.rgb = filter_combined(fragColor.rgb);