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-rw-r--r--src/maths/primitives.h163
1 files changed, 163 insertions, 0 deletions
diff --git a/src/maths/primitives.h b/src/maths/primitives.h
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+++ b/src/maths/primitives.h
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+#pragma once
+
+#include <assert.h>
+#include <stdlib.h>
+#include "core.h"
+#include "maths.h"
+#include "render_types.h"
+
+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
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