added voxel types

shaders/cube_frag.glsl

@@ -2,11 +2,23 @@
 
 out vec4 FragColor;
 
+flat in float v_VoxelKind;
+
 // [NEW] This variable will be set from your C++ code
 uniform vec3 u_Color;
 
 void main()
 {
     // Use the color from C++
-    FragColor = vec4(u_Color, 1.0);
+    // You can now use v_VoxelKind to modify the color
+    // Example: Different colors for different voxel types
+    vec3 color = u_Color;
+    if (v_VoxelKind == 0.0) {
+        // Dirt - brownish
+        color *= vec3(0.6, 0.4, 0.2);
+    } else if (v_VoxelKind == 1.0) {
+        // Stone - grayish (keep as is)
+    }
+
+    FragColor = vec4(color, 1.0);
 }

shaders/cube_vert.glsl

@@ -4,12 +4,14 @@
 // 'layout (location = 0)' matches the first attribute you enable.
 layout (location = 0) in vec3 aPos;
 layout (location = 1) in vec3 aNormal;
+layout (location = 2) in float aVoxelKind;
 
 // A "uniform" is a global variable you set from your C++/Java/etc. code.
 // This matrix combines your model, view, and projection matrices.
 uniform mat4 u_mvp;
 
 flat out vec3 v_Normal;
+flat out float v_VoxelKind;
 
 void main()
 {
@@ -18,4 +20,5 @@ void main()
     gl_Position = u_mvp * vec4(aPos, 1.0);
 
     v_Normal = aNormal;
+    v_VoxelKind = aVoxelKind;
 }