From 519111d7445e07c01f57d108f884b2d39d1834a7 Mon Sep 17 00:00:00 2001
From: Jarrod Doyle <thejarroddoyle@gmail.com>
Date: Tue, 18 Apr 2023 10:56:46 +0100
Subject: [PATCH] Delete old shadertoy based branchless dda shader

---
 assets/shaders/branchless_dda.wgsl | 87 ------------------------------
 1 file changed, 87 deletions(-)
 delete mode 100644 assets/shaders/branchless_dda.wgsl

diff --git a/assets/shaders/branchless_dda.wgsl b/assets/shaders/branchless_dda.wgsl
deleted file mode 100644
index 211a918..0000000
--- a/assets/shaders/branchless_dda.wgsl
+++ /dev/null
@@ -1,87 +0,0 @@
-// Based on: https://www.shadertoy.com/view/4dX3zl
-
-@group(0) @binding(0) var output: texture_storage_2d<rgba8unorm, write>;
-
-fn sdSphere(p: vec3<f32>, d: f32) -> f32 {
-    return length(p) - d;
-}
-
-fn sdBox(p: vec3<f32>, b: vec3<f32>) -> f32 {
-    let d: vec3<f32> = abs(p) - b;
-    return min(max(d.x, max(d.y, d.z)), 0.0) + length(max(d, vec3<f32>(0.0)));
-}
-
-fn getVoxel(c: vec3<i32>) -> bool {
-    let p = vec3<f32>(c) + vec3<f32>(0.5);
-    let d = min(max(-sdSphere(p, 7.5), sdBox(p, vec3<f32>(6.0))), -sdSphere(p, 25.0));
-    return d < 0.0;
-}
-
-@compute @workgroup_size(8, 8, 1)
-fn compute(@builtin(global_invocation_id) global_id: vec3<u32>) {
-    let img_coord = vec2<i32>(global_id.xy);
-    let img_dims = textureDimensions(output);
-    let img_coord_frac = vec2<f32>(
-        f32(img_coord.x) / f32(img_dims.x),
-        f32(img_coord.y) / f32(img_dims.y)
-    );
-
-    // Camera setup
-    let screen_pos = img_coord_frac * 2.0 - vec2<f32>(1.0);
-    let camera_dir = vec3<f32>(0.0, 0.0, 0.8);
-    let camera_plane_u = vec3<f32>(1.0, 0.0, 0.0);
-    let camera_plane_v = vec3<f32>(0.0, 1.0, 0.0) * f32(img_dims.y) / f32(img_dims.x);
-    let ray_dir = camera_dir + screen_pos.x * camera_plane_u + screen_pos.y * camera_plane_v;
-    let ray_pos = vec3<f32>(0.01, 2.0, -12.0);
-
-    // DDA setup
-    var map_pos: vec3<i32> = vec3<i32>(floor(ray_pos + 0.0));
-    var delta_dist: vec3<f32> = abs(vec3<f32>(length(ray_dir)) / ray_dir);
-    var ray_step: vec3<i32> = vec3<i32>(sign(ray_dir));
-    var side_dist: vec3<f32> = (sign(ray_dir) * (vec3<f32>(map_pos) - ray_pos) + (sign(ray_dir) * 0.5) + 0.5) * delta_dist;
-    var mask: vec3<bool> = vec3<bool>(false, false, false);
-
-    // DDA loop
-    for (var i: i32 = 0; i < 64; i++){
-        if (getVoxel(map_pos)) {
-            break;
-        }
-        if (side_dist.x < side_dist.y) {
-            if (side_dist.x < side_dist.z) {
-                side_dist += vec3<f32>(delta_dist.x, 0.0, 0.0);
-                map_pos += vec3<i32>(ray_step.x, 0, 0);
-                mask = vec3<bool>(true, false, false);
-            }
-            else {
-                side_dist += vec3<f32>(0.0, 0.0, delta_dist.z);
-                map_pos += vec3<i32>(0, 0, ray_step.z);
-                mask = vec3<bool>(false, false, true);
-            }
-        }
-        else {
-            if (side_dist.y < side_dist.z) {
-                side_dist += vec3<f32>(0.0, delta_dist.y, 0.0);
-                map_pos += vec3<i32>(0, ray_step.y, 0);
-                mask = vec3<bool>(false, true, false);
-            }
-            else {
-                side_dist += vec3<f32>(0.0, 0.0, delta_dist.z);
-                map_pos += vec3<i32>(0, 0, ray_step.z);
-                mask = vec3<bool>(false, false, true);
-            }
-        }
-    }
-
-    var color = vec4<f32>(0.0, 0.0, 0.0, 1.0);
-    if (mask.x) {
-        color.x = 1.0;
-    }
-    if (mask.y) {
-        color.y = 1.0;
-    }
-    if (mask.z) {
-        color.z = 1.0;
-    }
-
-    textureStore(output, img_coord, color);
-}
\ No newline at end of file