added more documentation. No more floating trees. added tree color variation

2 files changed, 5 insertions, 1 deletions

diff --git a/shaders/forest.frag b/shaders/forest.frag
index 7392a00..f2d7643 100644
--- a/shaders/forest.frag
+++ b/shaders/forest.frag
@@ -16,6 +16,7 @@ uniform float dY ;
 in vec2 texposition ;
 in vec3 normal ;
 in vec4 frag_position ;
+in float shade ;
 
 vec4 sample(float xc,float yc) {
    return texture2D(texture,texposition + vec2(xc,yc));
@@ -49,5 +50,5 @@ void main() {
     vec4 col = texture2D(texture,texposition) ;
     float coef = max(dot( normalize(newNorm),
                           normalize(vec3(frag_position - light)) ),0) + (globalAmbient.a/4.0) ;
-    frag_color = vec4( col.xyz * coef * globalAmbient.xyz, col.a);
+    frag_color = vec4( shade * col.xyz * coef * globalAmbient.xyz, col.a);
 }
diff --git a/shaders/forest.vert b/shaders/forest.vert
index ba2cfc4..c52174c 100644
--- a/shaders/forest.vert
+++ b/shaders/forest.vert
@@ -16,15 +16,18 @@ layout(location = 10) in vec3 in_translation ;
 layout(location = 11) in vec3 in_scale ;
 layout(location = 12) in vec2 in_sincos_rot ;
 layout(location = 13) in float noise ;
+layout(location = 14) in float in_shade ;
 
 out vec2 texposition ;
 out vec3 normal ;
 out vec4 frag_position ;
+out float shade ;
 
 void main() {
     float s = in_sincos_rot.x ;
     float c = in_sincos_rot.y ;
 
+    shade = in_shade ;
     mat3 rot = mat3( c,0,s,
                      0,1,0,
                     -s,0,c ) ;