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#include <assert.h>
#include "../sponge.h"
#define SPONGE_EXAMPLE_IMPLEMENTATION
#define SPONGE_EXAMPLE_INIT_DEFINED
#define SPONGE_EXAMPLE_MOUSE_MOVE_DEFINED
#define SPONGE_EXAMPLE_DRAW_FRAME_3D_DEFINED
#include "example.h"
#include "vendor/stb_image.h"
#define FOV (60.0f / PI * 2.0f)
#define DISTANCE (10.0f)
static sponge_Texture texture;
static int32_t mouse_x;
static int32_t mouse_y;
void init() {
unsigned char *data = stbi_load("examples/assets/kothd.png", &texture.width, &texture.height, NULL, 4);
if (!data) {
printf("%s\n", stbi_failure_reason());
assert(0);
}
texture.stride_pixels = texture.width;
texture.pixels = (sponge_Color32 *)data; // NOTE(kard): be careful if changing following loop
// converting from stbi's RGBA
for (size_t i = 0; i < texture.width * texture.height; i++) {
sponge_Color32 result;
result.r = data[i * 4 + 0];
result.g = data[i * 4 + 1];
result.b = data[i * 4 + 2];
result.a = data[i * 4 + 3];
texture.pixels[i] = result;
}
}
void mouse_move(int32_t x, int32_t y) {
mouse_x = x;
mouse_y = y;
}
void draw_frame_3d(sponge_Texture c, float *depths) {
sponge_clear_3d(c, depths, sponge_color32_make(0xFF000000));
// NOTE(kard): these directions are not intuitive at all, but it works
sponge_Vec3 positions[] = {
// front
sponge_vec3_make( 0.5f, 0.5f, -0.5f),
sponge_vec3_make(-0.5f, 0.5f, -0.5f),
sponge_vec3_make( 0.5f, -0.5f, -0.5f),
sponge_vec3_make(-0.5f, -0.5f, -0.5f),
// right
sponge_vec3_make(-0.5f, 0.5f, -0.5f),
sponge_vec3_make(-0.5f, 0.5f, 0.5f),
sponge_vec3_make(-0.5f, -0.5f, -0.5f),
sponge_vec3_make(-0.5f, -0.5f, 0.5f),
// left
sponge_vec3_make( 0.5f, 0.5f, 0.5f),
sponge_vec3_make( 0.5f, 0.5f, -0.5f),
sponge_vec3_make( 0.5f, -0.5f, 0.5f),
sponge_vec3_make( 0.5f, -0.5f, -0.5f),
// top
sponge_vec3_make( 0.5f, 0.5f, 0.5f),
sponge_vec3_make(-0.5f, 0.5f, 0.5f),
sponge_vec3_make( 0.5f, 0.5f, -0.5f),
sponge_vec3_make(-0.5f, 0.5f, -0.5f),
// bottom
sponge_vec3_make(-0.5f, -0.5f, 0.5f),
sponge_vec3_make( 0.5f, -0.5f, 0.5f),
sponge_vec3_make(-0.5f, -0.5f, -0.5f),
sponge_vec3_make( 0.5f, -0.5f, -0.5f),
// there is no back
};
// NOTE(kard): do not ask any questions
sponge_Vec2 uvs[] = {
// front
sponge_vec2_make(0.33f, 0.33f),
sponge_vec2_make(0.66f, 0.33f),
sponge_vec2_make(0.33f, 0.66f),
sponge_vec2_make(0.66f, 0.66f),
// right
sponge_vec2_make(0.66f, 0.33f),
sponge_vec2_make(1.00f, 0.00f),
sponge_vec2_make(0.66f, 0.66f),
sponge_vec2_make(1.00f, 1.00f),
// left
sponge_vec2_make(0.00f, 0.00f),
sponge_vec2_make(0.33f, 0.33f),
sponge_vec2_make(0.00f, 1.00f),
sponge_vec2_make(0.33f, 0.66f),
// top
sponge_vec2_make(0.00f, 0.00f),
sponge_vec2_make(1.00f, 0.00f),
sponge_vec2_make(0.33f, 0.33f),
sponge_vec2_make(0.66f, 0.33f),
// bottom
sponge_vec2_make(0.00f, 1.00f),
sponge_vec2_make(1.00f, 1.00f),
sponge_vec2_make(0.33f, 0.66f),
sponge_vec2_make(0.66f, 0.66f),
};
int32_t triangles[] = {
// front
0, 1, 2,
2, 1, 3,
// right
4, 5, 6,
6, 5, 7,
// left
8, 9, 10,
10, 9, 11,
// top
12, 13, 14,
14, 13, 15,
// bottom
16, 17, 18,
18, 17, 19,
};
sponge_Mat4 model = sponge_mat4_identity();
float rot_y = (float)mouse_x / (float)c.width * PI * 2.0f;
float rot_x = ((float)mouse_y / (float)c.height * PI) - (PI * 0.5f);
sponge_Mat4 view = sponge_mat4_identity();
view = sponge_mat4_mul_mat4(view, sponge_mat4_rotate(rot_x, rot_y, 0.0f));
view = sponge_mat4_mul_mat4(view, sponge_mat4_translate(0.0f, 0.0f, -5.0f));
sponge_Mat4 proj = sponge_mat4_projection(FOV, (float)c.width / (float)c.height, 1.0f, 100.0f);
sponge_draw_mesh_uv(c, depths, model, view, proj, positions, uvs, triangles, 30, texture);
}
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