made shaders faster

2 files changed, 6 insertions, 2 deletions

diff --git a/shaders/basic.frag b/shaders/basic.frag
index 719137d..835efbf 100644
--- a/shaders/basic.frag
+++ b/shaders/basic.frag
@@ -20,6 +20,8 @@ in float texture_blend[8] ;
 in vec2 texcoord ;
 in vec4 position ;
 
+flat in int texidx ;
+
 vec3 sample(float xc,float yc) {
     vec3 color = vec3(0);
     for ( int i = 0 ; i < 8 ; ++ i ) {
@@ -49,7 +51,7 @@ int dominentTexture() {
 }
 
 vec3 calNormChange( vec3 norm, vec3 down, vec3 right ) {
-    int dom = dominentTexture() ;
+    int dom = texidx ;
     float x00 = length(sample2(dom,-dX, dY)); 
     float x01 = length(sample2(dom,  0, dY)); 
     float x02 = length(sample2(dom, dX, dY)); 
diff --git a/shaders/basic.vert b/shaders/basic.vert
index e1abeb5..36e0c48 100644
--- a/shaders/basic.vert
+++ b/shaders/basic.vert
@@ -16,6 +16,7 @@ out vec4 position ;
 out vec3 normal ;
 
 out float texture_blend[8] ;
+flat out int texidx ;
 
 void main() {
     gl_Position = pjMatrix * (position = mvMatrix * vec4(in_position,1.0)) ;
@@ -23,5 +24,6 @@ void main() {
     normal = normalMatrix * in_normal ;
     for ( int i = 0 ; i < 8 ; ++ i ) 
         texture_blend[i] = 0 ;
-    texture_blend[int(clamp(round(in_color.a),0,8))] = 1.0 ;
+    texidx = int(clamp(round(in_color.a),0,8));
+    texture_blend[texidx] = 1.0 ;
 }