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#include "cheese3d.h"
#include "math3d.h"
#include "heap.h"
#include "rng.h"
#include "clock.h"
static u32 *make_cheese_texture(u32 tex_w, u32 tex_h, u32 density_min, u32 density_max)
{
u32 *texture = kmalloc(tex_h * tex_w * sizeof *texture);
for (u32 y = 0; y < tex_h; y++)
for (u32 x = 0; x < tex_w; x++) {
texture[y*tex_w+x] = 0xFFFFDE74;
}
int holes = density_min + rand() % (density_max-density_min+1);
for (int i = 0; i < holes; i++) {
u32 xo = rand() % tex_w;
u32 yo = rand() % tex_h;
i32 radius = 20 + rand() % 5;
for (i32 xi = -radius; xi <= radius; xi++) {
i32 x = xi+xo;
if (!(x >= 0 && x < (i32)tex_w))
continue;
double hi = sin(acos((double) xi / (double) radius))*radius;
for (i32 yi = -hi; yi <= hi; yi++) {
i32 y = yi+yo;
if (!(y >= 0 && y < (i32)tex_h))
continue;
texture[y*tex_w+x] = 0xFFFCA425;
}
}
}
return texture;
}
typedef struct {
usize num_verts;
vertex *vertices;
texture *textures;
u32 *texture;
float transform[4][4];
} cheese;
static cheese make_cheese_model(u32 segments, float slice, u32 tex_w, u32 tex_h)
{
static u32 crust_top = 0xFFFFD35F;
static u32 crust_back = 0xFFF2B71B;
usize num_verts = 12*segments+12;
vertex *vertices = kmalloc(sizeof *vertices * num_verts);
texture *textures = kmalloc(sizeof *textures * num_verts);
float angle = 0.0;
float seg_delta = slice/segments;
float x = cos(angle);
float z = sin(angle);
for (usize i = 0; i < segments; i++) {
angle += seg_delta;
float new_x = cos(angle);
float new_z = sin(angle);
vertex seg_verts[12] = {
// top face
VERT( 0.0, +0.5, 0.0, 0.0, 0.0),
VERT( x, +0.5, z, 0.0, 0.0),
VERT(new_x, +0.5, new_z, 0.0, 0.0),
// bottom face (🥺)
VERT( 0.0, -0.5, 0.0, 0.0, 0.0),
VERT(new_x, -0.5, new_z, 0.0, 0.0),
VERT( x, -0.5, z, 0.0, 0.0),
// back face
QUAD(
VERT( x, +0.5, z, 0.0, 0.0),
VERT( x, -0.5, z, 0.0, 0.0),
VERT(new_x, -0.5, new_z, 0.0, 0.0),
VERT(new_x, +0.5, new_z, 0.0, 0.0)
)
};
for (usize j = 0; j < 12; j++) vertices[i*12+j] = seg_verts[j];
for (usize j = 0; j < 6; j++) textures[i*12+j] = (texture) { 1, 1, &crust_top };
for (usize j = 6; j < 12; j++) textures[i*12+j] = (texture) { 1, 1, &crust_back };
x = new_x;
z = new_z;
}
float start_x = cos(0.0);
float start_z = sin(0.0);
float end_x = cos(slice);
float end_z = sin(slice);
vertex sides[12] = {
// left face
QUAD(
VERT( 0.0, +0.5, 0.0, 0.5, 0.0),
VERT( 0.0, -0.5, 0.0, 0.5, 1.0),
VERT(start_x, -0.5, start_z, 0.0, 1.0),
VERT(start_x, +0.5, start_z, 0.0, 0.0)
),
// right face
QUAD(
VERT( end_x, +0.5, end_z, 1.0, 0.0),
VERT( end_x, -0.5, end_z, 1.0, 1.0),
VERT( 0.0, -0.5, 0.0, 0.5, 1.0),
VERT( 0.0, +0.5, 0.0, 0.5, 0.0)
),
};
u32 *tex = make_cheese_texture(tex_w*2, tex_h, 40, 50);
u32 off = segments*12;
for (usize i = 0; i < 12; i++) vertices[off+i] = sides[i];
for (usize i = 0; i < 12; i++) textures[off+i] = (texture) { tex_w*2, tex_h, tex };
cheese ch = {
.num_verts = num_verts,
.vertices = vertices,
.textures = textures,
.texture = tex,
.transform = {{ 0.0 }},
};
mat_translate(ch.transform, (float []) { -0.5, 0.0, 0.0 });
float tmp[4][4];
mat_rot_y(tmp, slice/2.0);
mat_mul(ch.transform, tmp);
return ch;
}
void cheese_demo()
{
cheese3d_ctx ctx = cheese3d_create_default(0xFF000000);
cheese ch = make_cheese_model(8, rad(60), 500, 375);
float angle = 0;
u64 last_frame = clock_monotonic();
for (;;) {
u64 now = clock_monotonic();
float delta = (now - last_frame) / (float)(NANOSECONDS);
last_frame = now;
angle += delta * 120;
float transform[4][4];
float tmp[4][4];
mat_perspective(transform, rad(45.0), (float)ctx.width/(float)ctx.height, 0.01, 25.0);
mat_translate(tmp, (float []) { 0.0, -0.0, 10.0 });
mat_mul(transform, tmp);
mat_rot_x(tmp, rad(-20));
mat_mul(transform, tmp);
mat_rot_y(tmp, rad(angle));
mat_mul(transform, tmp);
mat_scale(tmp, (float []){ 4.0, 3.0, 4.0 });
mat_mul(transform, tmp);
mat_mul(transform, ch.transform);
cheese3d_clear(ctx, true, true);
cheese3d_render(ctx, ch.num_verts, ch.vertices, ch.textures, transform);
cheese3d_display(ctx);
}
cheese3d_destroy(ctx);
kfree(ch.textures);
kfree(ch.vertices);
kfree(ch.texture);
}
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