Merge pull request #14 from omnisci3nce/realign

Realign

1 files changed, 138 insertions, 0 deletions

diff --git a/src/maths/primitives.c b/src/maths/primitives.c
new file mode 100644
index 0000000..b9ec868
--- /dev/null
+++ b/src/maths/primitives.c
@@ -0,0 +1,138 @@
+#include "primitives.h"
+#include "colours.h"
+#include "maths.h"
+#include "ral_types.h"
+#include "render_types.h"
+
+// TODO: move to another file
+void geo_free_data(geometry_data* geo) {
+  vertex_darray_free(geo->vertices);
+  geo->vertices = NULL;
+  // TODO: do indices as well
+  /* if (geo->has_indices) { */
+  /*   u32_darray_free(&geo->indices); */
+  /* } */
+}
+
+// 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 };
+
+#define VERT_3D(arr, pos, norm, uv)                                                    \
+  {                                                                                    \
+    vertex v = { .static_3d = { .position = pos, .normal = norm, .tex_coords = uv } }; \
+    vertex_darray_push(arr, v);                                                        \
+  }
+
+geometry_data geo_create_cuboid(f32x3 extents) {
+  /* static mesh prim_cube_mesh_create() { */
+  vertex_darray* vertices = vertex_darray_new(36);
+
+  // back faces
+  VERT_3D(vertices, BACK_TOP_RIGHT, VEC3_NEG_Z, vec2(1, 0));
+  VERT_3D(vertices, BACK_BOT_LEFT, VEC3_NEG_Z, vec2(0, 1));
+  VERT_3D(vertices, BACK_TOP_LEFT, VEC3_NEG_Z, vec2(0, 0));
+  VERT_3D(vertices, BACK_TOP_RIGHT, VEC3_NEG_Z, vec2(1, 0));
+  VERT_3D(vertices, BACK_BOT_RIGHT, VEC3_NEG_Z, vec2(1, 1));
+  VERT_3D(vertices, BACK_BOT_LEFT, VEC3_NEG_Z, vec2(0, 1));
+
+  // front faces
+  VERT_3D(vertices, FRONT_BOT_LEFT, VEC3_Z, vec2(0, 1));
+  VERT_3D(vertices, FRONT_TOP_RIGHT, VEC3_Z, vec2(1, 0));
+  VERT_3D(vertices, FRONT_TOP_LEFT, VEC3_Z, vec2(0, 0));
+  VERT_3D(vertices, FRONT_BOT_LEFT, VEC3_Z, vec2(0, 1));
+  VERT_3D(vertices, FRONT_BOT_RIGHT, VEC3_Z, vec2(1, 1));
+  VERT_3D(vertices, FRONT_TOP_RIGHT, VEC3_Z, vec2(1, 0));
+
+  // top faces
+  VERT_3D(vertices, BACK_TOP_LEFT, VEC3_Y, vec2(0, 0));
+  VERT_3D(vertices, FRONT_TOP_LEFT, VEC3_Y, vec2(0, 1));
+  VERT_3D(vertices, FRONT_TOP_RIGHT, VEC3_Y, vec2(1, 1));
+  VERT_3D(vertices, BACK_TOP_LEFT, VEC3_Y, vec2(0, 0));
+  VERT_3D(vertices, FRONT_TOP_RIGHT, VEC3_Y, vec2(1, 1));
+  VERT_3D(vertices, BACK_TOP_RIGHT, VEC3_Y, vec2(1, 0));
+
+  // bottom faces
+  VERT_3D(vertices, BACK_BOT_LEFT, VEC3_NEG_Y, vec2(0, 1));
+  VERT_3D(vertices, FRONT_BOT_RIGHT, VEC3_NEG_Y, vec2(1, 1));
+  VERT_3D(vertices, FRONT_BOT_LEFT, VEC3_NEG_Y, vec2(0, 1));
+  VERT_3D(vertices, BACK_BOT_LEFT, VEC3_NEG_Y, vec2(0, 1));
+  VERT_3D(vertices, BACK_BOT_RIGHT, VEC3_NEG_Y, vec2(1, 1));
+  VERT_3D(vertices, FRONT_BOT_RIGHT, VEC3_NEG_Y, vec2(0, 1));
+
+  // right faces
+  VERT_3D(vertices, FRONT_TOP_RIGHT, VEC3_X, vec2(0, 0));
+  VERT_3D(vertices, BACK_BOT_RIGHT, VEC3_X, vec2(1, 1));
+  VERT_3D(vertices, BACK_TOP_RIGHT, VEC3_X, vec2(1, 0));
+  VERT_3D(vertices, BACK_BOT_RIGHT, VEC3_X, vec2(1, 1));
+  VERT_3D(vertices, FRONT_TOP_RIGHT, VEC3_X, vec2(0, 0));
+  VERT_3D(vertices, FRONT_BOT_RIGHT, VEC3_X, vec2(0, 1));
+
+  // left faces
+  VERT_3D(vertices, FRONT_TOP_LEFT, VEC3_NEG_X, vec2(0, 0));
+  VERT_3D(vertices, BACK_TOP_LEFT, VEC3_NEG_X, vec2(0, 0));
+  VERT_3D(vertices, BACK_BOT_LEFT, VEC3_NEG_X, vec2(0, 0));
+  VERT_3D(vertices, BACK_BOT_LEFT, VEC3_NEG_X, vec2(0, 0));
+  VERT_3D(vertices, FRONT_BOT_LEFT, VEC3_NEG_X, vec2(0, 0));
+  VERT_3D(vertices, FRONT_TOP_LEFT, VEC3_NEG_X, vec2(0, 0));
+
+  u32_darray* indices = u32_darray_new(vertices->len);
+
+  for (u32 i = 0; i < vertices->len; i++) {
+    u32_darray_push(indices, i);
+  }
+
+  geometry_data geo = {
+    .format = VERTEX_STATIC_3D,
+    .vertices = vertices,
+    .has_indices = true,
+    .indices = *indices,  // FIXME: make darray methods that return stack allocated struct
+    .colour = vec3(0, 0, 0),
+  };
+
+  return geo;
+}
+
+/* /\** @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 }; */
+/* } */
+
+// --- Spheres
+
+geometry_data geo_create_uvsphere(f32 radius, f32 north_south_lines, f32 east_west_lines) {
+  // TODO
+}