X-Git-Url: http://git.lukelau.me/?a=blobdiff_plain;f=billboardfrag.glsl;h=b4cfd511464569ea23c577cda41a5b261c7ba288;hb=c8b0a84bbafd306103b005e7e238b11a656dcba3;hp=16e074e616aae9ea8101b38a11564982e249c894;hpb=92594780db1f9bb51b97e68457c526fa4287a29e;p=clouds.git

diff --git a/billboardfrag.glsl b/billboardfrag.glsl
index 16e074e..b4cfd51 100644
--- a/billboardfrag.glsl
+++ b/billboardfrag.glsl
@@ -5,10 +5,15 @@ in vec2 texCoord;
 out vec4 FragColor;
 uniform bool modulate;
 uniform bool debug;
+uniform bool debugColor;
 uniform float debugVal;
 void main() {
+  if (debugColor) {
+    FragColor = color;
+    return;
+  }
   if (debug) {
-    FragColor = mix(vec4(1, 1, 1, 1), vec4(1, 0, 0, 1), debugVal);
+    FragColor = mix(vec4(1, 1, 1, 0), vec4(1, 0, 0, 1), debugVal);
     return;
   }
   // Cf = color from fragment, Ct = color from texture
@@ -20,8 +25,13 @@ void main() {
     // GL_MODULATE: C
     // C = Cf * Ct
     // A = Af * At
-		FragColor = color * f;
+    // the +0.06 is a hack to get lighter clouds!
+    // can be thought of as ambient light
+    FragColor = color * (f + 0.02);
   } else {
+    // "That is, the colors in the frame buffer are multiplied by the
+    // attenuation ratio of the billboard texture and then the colors in
+    // the texture are added"
     // GL_BLEND:
     // C = Cf * (1-Ct) + Cc * Ct
     // A = Af * At