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/apps/tools/twndel: initial texture projection work

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This commit is contained in:
veclavtalica 2025-03-11 01:53:45 +03:00
parent a472e6af52
commit 37e46e9a7e
2 changed files with 104 additions and 19 deletions
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6
apps/tools/twndel/state.h
View File

@ -50,7 +50,10 @@ typedef struct Point {
/* points have p1, p2, p3 = INVALID_POINT */
typedef struct Face {
uint16_t p[4];
/* texture origin, as point on face plane, in absolute coordinates */
int16_t tex_x, tex_y;
uint8_t texture;
uint8_t tex_scale;
} Face;
typedef struct Object {
@ -82,12 +85,13 @@ typedef struct State {
Point points[POINT_LIMIT];
uint16_t points_sz;
Object *objects;
Object objects[OBJECT_LIMIT];
uint8_t objects_sz;
/* which axes are blocked and which are not */
/* order: x, y, z */
bool axis_mask[3];
char *current_texture;
} State;

117
apps/tools/twndel/tool.c
View File

@ -8,13 +8,16 @@
/* grid-based, bounded space (65536 / POINTS_PER_METER meters), which allows for efficient storage */
/* 65534 point limit, 16 object limit, 2048 faces per object, 32 textures per object */
/* triangles and quads only */
/* support for billboards and flat two sided quads */
/* texture painting */
/* bones with mesh animations, snapping to grid, with no weights */
/* billboard render to specified angles */
/* 1 point light primitive lighting */
/* live edited textures are capped at 128x128 */
/* assumptions: */
/* up is always (0,1,0) */
/* preallocations everywhere */
static State state;
static bool init;
@ -24,8 +27,6 @@ static uint8_t new_object(const char *name) {
if (state.objects_sz >= OBJECT_LIMIT)
return INVALID_OBJECT;
state.objects_sz++;
state.objects = SDL_realloc(state.objects, state.objects_sz * sizeof (*state.objects));
SDL_memset(&state.objects[state.objects_sz-1], 0, sizeof (Object));
state.objects[state.objects_sz-1].name = SDL_strdup(name);
return state.objects_sz-1;
}
@ -40,10 +41,18 @@ static uint16_t new_point(int16_t x, int16_t y, int16_t z) {
}
static uint16_t push_face(uint8_t object, uint16_t p0, uint16_t p1, uint16_t p2, uint16_t p3, uint8_t texture) {
static uint16_t push_face(uint8_t object,
uint16_t p0, uint16_t p1, uint16_t p2, uint16_t p3,
uint8_t texture, uint8_t tex_scale, int16_t tex_x, int16_t tex_y)
{
Object *o = &state.objects[object];
o->faces_sz++;
o->faces[o->faces_sz-1] = (Face) {.p = {p0, p1, p2, p3}, .texture = texture};
o->faces[o->faces_sz-1] = (Face) {
.p = {p0, p1, p2, p3},
.texture = texture,
.tex_scale = tex_scale,
.tex_x = tex_x, .tex_y = tex_y,
};
return o->faces_sz-1;
}
@ -73,6 +82,22 @@ static inline Vec3 point_to_vec3(uint8_t object, uint16_t point) {
}
static inline Vec2 project_texture_coordinate(Vec2 origin, Vec3 plane, Vec3 point, float scale) {
Vec3 right = vec3_norm(vec3_cross(plane, (Vec3){0,1,0}));
if (isnanf(right.x)) right = vec3_norm(vec3_cross(plane, (Vec3){1,0,0}));
Vec3 up = vec3_norm(vec3_cross(plane, right));
log_vec3(right, "right");
log_vec3(up, "up");
Vec3 proj_origin = vec3_add(vec3_scale(right, origin.x), vec3_scale(up, origin.y));
log_vec3(proj_origin, "proj_origin");
Vec3 local = vec3_sub(proj_origin, point);
log_vec3(local, "local");
log_float(vec3_dot(local, right) / scale, "dot_x");
log_float(vec3_dot(local, up) / scale, "dot_y");
return (Vec2){ vec3_dot(local, right) * scale, vec3_dot(local, up) * scale };
}
static void render_object(uint8_t object) {
Object *o = &state.objects[object];
@ -81,6 +106,7 @@ static void render_object(uint8_t object) {
for (uint16_t fi = 0; fi < o->faces_sz; ++fi) {
Face *f = &o->faces[fi];
/* quads */
if (f->p[3] != INVALID_POINT) {
Vec3 p0 = point_to_vec3(object, f->p[0]);
@ -88,11 +114,17 @@ static void render_object(uint8_t object) {
Vec3 p2 = point_to_vec3(object, f->p[2]);
Vec3 p3 = point_to_vec3(object, f->p[3]);
if (state.solid_display_mode)
draw_quad(o->textures[f->texture],
if (state.solid_display_mode) {
Vec3 n = vec3_norm(vec3_cross(vec3_sub(p1, p0), vec3_sub(p2, p0)));
Vec2 to = { f->tex_x / (float)POINTS_PER_METER, f->tex_y / (float)POINTS_PER_METER, };
Vec2 tul = project_texture_coordinate(to, n, p0, (float)f->tex_scale);
Vec2 tdr = project_texture_coordinate(to, n, p2, (float)f->tex_scale);
draw_quad(state.current_texture,
p0, p1, p2, p3,
(Rect){0,0,32,32},
(Rect){tul.x, tdr.x, tdr.x - tul.x, tdr.y - tul.y},
(Color){255,255,255,255} );
}
else {
draw_line_3d(p0, p1, 1, (Color){255,255,255,255});
draw_line_3d(p1, p2, 1, (Color){255,255,255,255});
@ -100,9 +132,19 @@ static void render_object(uint8_t object) {
draw_line_3d(p3, p0, 1, (Color){255,255,255,255});
}
} else {
/* triangles */
/* TODO: */
SDL_assert_always(false);
Vec3 p0 = point_to_vec3(object, f->p[0]);
Vec3 p1 = point_to_vec3(object, f->p[1]);
Vec3 p2 = point_to_vec3(object, f->p[2]);
// if (state.solid_display_mode)
// draw_triangle(state.current_texture,
// p0, p1, p2, )
// else {
// draw_line_3d(p0, p1, 1, (Color){255,255,255,255});
// draw_line_3d(p1, p2, 1, (Color){255,255,255,255});
// draw_line_3d(p2, p3, 1, (Color){255,255,255,255});
// draw_line_3d(p3, p0, 1, (Color){255,255,255,255});
// }
}
}
}
@ -121,12 +163,12 @@ static uint8_t new_cube(Point pos, Point size) {
uint16_t p7 = new_point(pos.x + size.x / 2, pos.y - size.y / 2, pos.z + size.z / 2);
uint8_t tex = push_texture(object, "/data/placeholder.png");
push_face(object, p0, p1, p2, p3, tex);
push_face(object, p7, p6, p5, p4, tex);
push_face(object, p4, p5, p1, p0, tex);
push_face(object, p6, p7, p3, p2, tex);
push_face(object, p2, p1, p5, p6, tex);
push_face(object, p0, p3, p7, p4, tex);
push_face(object, p2, p3, p0, p1, tex, 128, 0, 0);
push_face(object, p5, p4, p7, p6, tex, 128, 0, 0);
push_face(object, p1, p0, p4, p5, tex, 128, 0, 0);
push_face(object, p6, p7, p3, p2, tex, 128, 0, 0);
push_face(object, p2, p1, p5, p6, tex, 128, 0, 0);
push_face(object, p0, p3, p7, p4, tex, 128, 0, 0);
return object;
}
@ -477,6 +519,42 @@ static void draw_axes(void) {
}
static void display_textures(void) {
String list = file_read("/data/assets/", ":images");
if (!list.data)
return;
draw_rectangle((Rect){0, 480 - 50, 640, 480}, (Color){0,0,0,126});
char *selected = NULL;
char *saveptr = NULL;
int count = 0;
char const *part = SDL_strtokr(list.data, "\n", &saveptr);
do {
Rect box = (Rect){(float)count * 50, 480 - 48, 48, 48};
draw_sprite(part,
box,
(Rect){0,0,64,64},
(Color){255,255,255,255},
0, false, false, true);
count++;
if (rect_intersects(box, (Rect){ctx.mouse_position.x, ctx.mouse_position.y, 1, 1}))
selected = SDL_strdup(part);
} while ((part = SDL_strtokr(NULL, "\n", &saveptr)));
if (selected) {
draw_text(selected, (Vec2){0, 480 - 48 - 24}, 24, (Color){255,255,255,255}, NULL);
if (input_action_just_pressed("select")) {
if (state.current_texture) SDL_free(state.current_texture);
state.current_texture = selected;
} else
SDL_free(selected);
}
}
void game_tick(void) {
if (!init) {
/* default state */
@ -529,6 +607,9 @@ void game_tick(void) {
for (uint8_t obj = 0; obj < state.objects_sz; ++obj)
render_object(obj);
if (state.solid_display_mode)
display_textures();
draw_text("twndel\x03", (Vec2){0, 2}, 32, (Color){255,255,255,200}, NULL);
draw_camera(
state.camera_position,
@ -548,6 +629,6 @@ void game_end(void) {
SDL_free(o->textures[t]);
SDL_free(o->name);
}
if (state.objects_sz != 0)
SDL_free(state.objects);
if (state.current_texture)
SDL_free(state.current_texture);
}