From 13949ca02bcf9fcdfcc48ea7949f617553a260b6 Mon Sep 17 00:00:00 2001
From: omniscient <17525998+omnisci3nce@users.noreply.github.com>
Date: Tue, 13 Aug 2024 17:25:13 +1000
Subject: allow UV tiling for plane geometry

---
 src/maths/primitives.c | 21 +++++++++++----------
 src/maths/primitives.h |  2 +-
 2 files changed, 12 insertions(+), 11 deletions(-)

(limited to 'src/maths')

diff --git a/src/maths/primitives.c b/src/maths/primitives.c
index 1e1e673..13fa81b 100644
--- a/src/maths/primitives.c
+++ b/src/maths/primitives.c
@@ -20,7 +20,8 @@ Vec3 plane_vertex_positions[] = {
   (Vec3){ 0.5, 0, 0.5 },
 };
 
-Geometry Geo_CreatePlane(f32x2 extents) {
+Geometry Geo_CreatePlane(f32x2 extents, u32 tiling_u, u32 tiling_v) {
+  CASSERT(tiling_u >= 1 && tiling_v >= 1);
   Vertex_darray* vertices = Vertex_darray_new(4);
   u32_darray* indices = u32_darray_new(vertices->len);
 
@@ -30,15 +31,15 @@ Geometry Geo_CreatePlane(f32x2 extents) {
     vert_pos[i].x *= extents.x;
     vert_pos[i].z *= extents.y;
   }
-  VERT_3D(vertices, vert_pos[0], VEC3_Y, vec2(0, 0));  // back left
-  VERT_3D(vertices, vert_pos[1], VEC3_Y, vec2(1, 0));  // back right
-  VERT_3D(vertices, vert_pos[2], VEC3_Y, vec2(0, 1));  // front left
-  VERT_3D(vertices, vert_pos[3], VEC3_Y, vec2(1, 1));  // front right
-
-  push_triangle(indices, 0, 1, 2);
-  push_triangle(indices, 2, 1, 3);
-  // push_triangle(indices, 2, 1, 0);
-  // push_triangle(indices, 3, 2, 1);
+  VERT_3D(vertices, vert_pos[0], VEC3_Y, vec2(0, 0));                       // back left
+  VERT_3D(vertices, vert_pos[1], VEC3_Y, vec2(1 * tiling_u, 0 * tiling_v)); // back right
+  VERT_3D(vertices, vert_pos[2], VEC3_Y, vec2(0, 1 * tiling_v));            // front left
+  VERT_3D(vertices, vert_pos[3], VEC3_Y, vec2(1 * tiling_u, 1 * tiling_v)); // front right
+
+  // push_triangle(indices, 0, 1, 2);
+  // push_triangle(indices, 2, 1, 3);
+  push_triangle(indices, 2, 1, 0);
+  push_triangle(indices, 1,2,3);
 
   for (int i = 0; i < 4; i++) {
     printf("Vertex %d: (%f, %f, %f)\n", i, vert_pos[i].x, vert_pos[i].y, vert_pos[i].z);
diff --git a/src/maths/primitives.h b/src/maths/primitives.h
index f7b390d..bcf71c8 100644
--- a/src/maths/primitives.h
+++ b/src/maths/primitives.h
@@ -6,7 +6,7 @@
 #include "maths_types.h"
 #include "render_types.h"
 
-Geometry Geo_CreatePlane(f32x2 extents);
+Geometry Geo_CreatePlane(f32x2 extents, u32 tiling_u, u32 tiling_v);
 Geometry Geo_CreateCuboid(f32x3 extents);
 Geometry Geo_CreateCylinder(f32 radius, f32 height, u32 resolution);
 Geometry Geo_CreateUVsphere(f32 radius, u32 north_south_lines, u32 east_west_lines);
-- 
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