- add checkerboard shader for primitives

Author: polymonster

plugins/ecs_basic/src/primitives.rs

@@ -41,7 +41,7 @@ pub fn setup_primitives(
     mut commands: bevy_ecs::system::Commands) {
 
     let meshes = vec![
-        hotline_rs::primitives::create_plane_mesh(&mut device.0, 64),
+        hotline_rs::primitives::create_plane_mesh(&mut device.0, 1),
         hotline_rs::primitives::create_tetrahedron_mesh(&mut device.0),
         hotline_rs::primitives::create_cube_mesh(&mut device.0),
     ];
@@ -51,8 +51,8 @@ pub fn setup_primitives(
     let irc = rc as i32; 
 
     let size = 10.0;
-    let half_size = size * 0.5;
-    let step = size * 2.5;
+    let half_size = size * 0.5;    
+    let step = size * half_size;
     let half_extent = rc * half_size;
     let start_pos = vec3f(half_extent, size, half_extent);
 
@@ -62,8 +62,8 @@ pub fn setup_primitives(
             if i < meshes.len() {
                 let iter_pos = start_pos + vec3f(x as f32 * step, 0.0, y as f32 * step);
                 commands.spawn((
-                    MeshComponent {0: meshes[i].clone()},
-                    WorldMatrix { 0: Mat4f::from_translation(iter_pos) * Mat4f::from_scale(splat3f(10.0))},
+                    MeshComponent(meshes[i].clone()),
+                    WorldMatrix(Mat4f::from_translation(iter_pos) * Mat4f::from_scale(splat3f(10.0))),
                 ));
             }
             i = i + 1;

src/shaders/basic.hlsl

@@ -1,11 +1,7 @@
-struct vs_input_3d {
-    float3 position : POSITION;
-    float4 colour: TEXCOORD;
-};
-
 struct vs_output {
     float4 position : SV_POSITION0;
-    float4 colour: TEXCOORD;
+    float4 colour: TEXCOORD0;
+    float2 texcoord: TEXCOORD1;
 };
 
 struct ps_output {
@@ -74,6 +70,7 @@ vs_output vs_mesh(vs_input_mesh input) {
     output.position = mul(pos, projection_matrix);
 
     output.colour = float4(input.normal.xyz * 0.5 + 0.5, 1.0);
+    output.texcoord = input.texcoord;
 
     return output;
 }
@@ -132,8 +129,29 @@ ps_output ps_main(vs_output input) {
     return output;
 }
 
+
+
 ps_output ps_checkerboard(vs_output input) {
     ps_output output;
     output.colour = input.colour;
+
+    float size = 5.0;
+
+    float x = (input.texcoord.x * 0.5 + 0.5) * size;
+    float y = (input.texcoord.y * 0.5 + 0.5) * size;
+
+    float ix;
+    modf(x, ix);
+    float rx = fmod(ix, 2.0) < 0.1 ? 0.0 : 1.0;
+
+    float iy;
+    modf(y, iy);
+    float ry = fmod(iy, 2.0) < 0.1 ? 0.0 : 1.0;
+
+    float rxy = rx + ry > 1.0 ? 0.0 : rx + ry;
+
+    output.colour.rgb *= rxy < 0.001 ? 0.5 : 1.0;
+
+    output.colour.a = 1.0;
     return output;
 }