wip

1 files changed, 187 insertions, 0 deletions

diff --git a/src/maths/primitives.c b/src/maths/primitives.c
new file mode 100644
index 0000000..42c51ea
--- /dev/null
+++ b/src/maths/primitives.c
@@ -0,0 +1,187 @@
+#include "primitives.h"
+
+// vertices
+f32 plane_vertex_positions[] = {
+  // triangle 1
+  -0.5, 0, -0.5, -0.5, 0, 0.5, 0.5, 0, -0.5,
+  // triangle 2
+  0.5, 0, -0.5, -0.5, 0, 0.5, 0.5, 0, 0.5
+};
+
+geometry_data geo_create_plane(f32x2 extents) {
+  f32x2 half_extents = vec2_div(extents, 2.0);
+  vertex_format format = VERTEX_STATIC_3D;
+  vertex_darray* vertices = vertex_darray_new(4);
+
+  vertex_darray_push(
+    vertices,
+    (vertex) {.static_3d = {
+      .position = 
+    }}
+  );
+
+  return (geometry_data) {
+    .format = format,
+    .vertices = 
+    .has_indices = true,
+  } 
+}
+
+
+// OLD
+
+static const vec3 BACK_BOT_LEFT = (vec3){ 0, 0, 0 };
+static const vec3 BACK_BOT_RIGHT = (vec3){ 1, 0, 0 };
+static const vec3 BACK_TOP_LEFT = (vec3){ 0, 1, 0 };
+static const vec3 BACK_TOP_RIGHT = (vec3){ 1, 1, 0 };
+static const vec3 FRONT_BOT_LEFT = (vec3){ 0, 0, 1 };
+static const vec3 FRONT_BOT_RIGHT = (vec3){ 1, 0, 1 };
+static const vec3 FRONT_TOP_LEFT = (vec3){ 0, 1, 1 };
+static const vec3 FRONT_TOP_RIGHT = (vec3){ 1, 1, 1 };
+
+static mesh prim_cube_mesh_create() {
+  mesh cube = { 0 };
+  cube.vertices = vertex_darray_new(36);
+
+  // back faces
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_LEFT, .normal = VEC3_NEG_Z, .uv = (vec2){ 0, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_TOP_LEFT, .normal = VEC3_NEG_Z, .uv = (vec2){ 0, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_TOP_RIGHT, .normal = VEC3_NEG_Z, .uv = (vec2){ 1, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_TOP_RIGHT, .normal = VEC3_NEG_Z, .uv = (vec2){ 1, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_NEG_Z, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_LEFT, .normal = VEC3_NEG_Z, .uv = (vec2){ 0, 1 } });
+
+  // front faces
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_LEFT, .normal = VEC3_Z, .uv = (vec2){ 0, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Z, .uv = (vec2){ 1, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_LEFT, .normal = VEC3_Z, .uv = (vec2){ 0, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_LEFT, .normal = VEC3_Z, .uv = (vec2){ 0, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_RIGHT, .normal = VEC3_Z, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Z, .uv = (vec2){ 1, 0 } });
+
+  // top faces
+  vertex_darray_push(cube.vertices,
+                     (vertex){ .position = BACK_TOP_LEFT, .normal = VEC3_Y, .uv = (vec2){ 0, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_LEFT, .normal = VEC3_Y, .uv = (vec2){ 0, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Y, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(cube.vertices,
+                     (vertex){ .position = BACK_TOP_LEFT, .normal = VEC3_Y, .uv = (vec2){ 0, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_Y, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_TOP_RIGHT, .normal = VEC3_Y, .uv = (vec2){ 1, 0 } });
+
+  // bottom faces
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_LEFT, .normal = VEC3_NEG_Y, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_RIGHT, .normal = VEC3_NEG_Y, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_LEFT, .normal = VEC3_NEG_Y, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_LEFT, .normal = VEC3_NEG_Y, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_NEG_Y, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_RIGHT, .normal = VEC3_NEG_Y, .uv = (vec2){ 0 } });
+
+  // right faces
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_X, .uv = (vec2){ 0, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_X, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_TOP_RIGHT, .normal = VEC3_X, .uv = (vec2){ 1, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_RIGHT, .normal = VEC3_X, .uv = (vec2){ 1, 1 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_RIGHT, .normal = VEC3_X, .uv = (vec2){ 0, 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_RIGHT, .normal = VEC3_X, .uv = (vec2){ 0, 1 } });
+
+  // left faces
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_LEFT, .normal = VEC3_NEG_X, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_TOP_LEFT, .normal = VEC3_NEG_X, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_LEFT, .normal = VEC3_NEG_X, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = BACK_BOT_LEFT, .normal = VEC3_NEG_X, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_BOT_LEFT, .normal = VEC3_NEG_X, .uv = (vec2){ 0 } });
+  vertex_darray_push(
+      cube.vertices,
+      (vertex){ .position = FRONT_TOP_LEFT, .normal = VEC3_NEG_X, .uv = (vec2){ 0 } });
+
+  cube.indices_len = cube.vertices->len;
+  cube.indices = malloc(sizeof(u32) * cube.indices_len);
+
+  for (u32 i = 0; i < cube.indices_len; i++) {
+    cube.indices[i] = i;
+  }
+
+  cube.has_indices = true;
+
+  return cube;
+}
+
+/** @brief create a new model with the shape of a cube */
+static model_handle prim_cube_new(core* core) {
+  model model = { 0 };
+  mesh cube = prim_cube_mesh_create();
+
+  mesh_darray_push(model.meshes, cube);
+  assert(mesh_darray_len(model.meshes) == 1);
+
+  u32 index = (u32)model_darray_len(core->models);
+  model_darray_push_copy(core->models, &model);
+  return (model_handle){ .raw = index };
+}
\ No newline at end of file