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draw: draw_distance for 3d spaces, proper positioning of skybox according to it, scenery demo on circle rasters

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veclavtalica
2025-02-26 15:53:59 +03:00
parent 23fbd45564
commit 8c0f43ec34
9 changed files with 123 additions and 80 deletions
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46
apps/demos/scenery/scenes/ingame.c
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@ -12,10 +12,13 @@
#define TERRAIN_FREQUENCY 0.15f
#define TERRAIN_DISTANCE 128
#define TERRAIN_RADIUS 128
#define GRASS_RADIUS 16
#define TERRAIN_DISTANCE (TERRAIN_RADIUS * 2)
#define HALF_TERRAIN_DISTANCE ((float)TERRAIN_DISTANCE / 2)
#define PLAYER_HEIGHT 0.6f
/* TODO: pregenerate grid of levels of detail */
static float heightmap[TERRAIN_DISTANCE][TERRAIN_DISTANCE];
@ -23,7 +26,7 @@ static void process_fly_mode(State *state) {
SceneIngame *scn = (SceneIngame *)state->scene;
DrawCameraFromPrincipalAxesResult dir_and_up =
draw_camera_from_principal_axes(scn->pos, scn->roll, scn->pitch, scn->yaw, (float)M_PI_2 * 0.8f, 1);
draw_camera_from_principal_axes(scn->pos, scn->roll, scn->pitch, scn->yaw, (float)M_PI_2 * 0.8f, 1, TERRAIN_RADIUS * M_SQRT2f);
const Vec3 right = m_vec_norm(m_vec_cross(dir_and_up.direction, dir_and_up.up));
const float speed = 0.04f; /* TODO: put this in a better place */
@ -80,7 +83,7 @@ static void process_ground_mode(State *state) {
SceneIngame *scn = (SceneIngame *)state->scene;
DrawCameraFromPrincipalAxesResult dir_and_up =
draw_camera_from_principal_axes(scn->pos, scn->roll, scn->pitch, scn->yaw, (float)M_PI_2 * 0.8f, 1);
draw_camera_from_principal_axes(scn->pos, scn->roll, scn->pitch, scn->yaw, (float)M_PI_2 * 0.8f, 1, TERRAIN_RADIUS * M_SQRT2f);
dir_and_up.direction.y = 0;
dir_and_up.direction = vec3_norm(dir_and_up.direction);
@ -134,7 +137,7 @@ static void generate_terrain(SceneIngame *scn) {
float y = floorf(scn->pos.z - HALF_TERRAIN_DISTANCE + (float)ly);
float height = stb_perlin_noise3((float)x * TERRAIN_FREQUENCY, (float)y * TERRAIN_FREQUENCY, 0, 0, 0, 0) * 3 - 1;
height += stb_perlin_noise3((float)x * TERRAIN_FREQUENCY / 10, (float)y * TERRAIN_FREQUENCY / 10, 0, 0, 0, 0) * 10 - 1;
height += stb_perlin_noise3((float)x * TERRAIN_FREQUENCY / 10, (float)y * TERRAIN_FREQUENCY / 10, 0, 0, 0, 0) * 20 - 1;
heightmap[lx][ly] = height;
}
@ -142,9 +145,23 @@ static void generate_terrain(SceneIngame *scn) {
}
static int32_t ceil_sqrt(int32_t const n) {
int32_t res = 1;
while(res * res < n)
res++;
return res;
}
static void draw_terrain(SceneIngame *scn) {
for (int ly = TERRAIN_DISTANCE - 1; ly > 0; ly--) {
for (int lx = 0; lx < TERRAIN_DISTANCE - 1; lx++) {
/* draw terrain in circle */
int32_t const rsi = (int32_t)TERRAIN_RADIUS * (int32_t)TERRAIN_RADIUS;
for (int32_t iy = -(int32_t)TERRAIN_RADIUS; iy <= (int32_t)TERRAIN_RADIUS - 1; ++iy) {
int32_t const dx = ceil_sqrt(rsi - (iy + (iy <= 0)) * (iy + (iy <= 0)));
for (int32_t ix = -dx; ix < dx; ++ix) {
int32_t lx = ix + TERRAIN_RADIUS;
int32_t ly = iy + TERRAIN_RADIUS;
int32_t x = (int32_t)(floorf(scn->pos.x - HALF_TERRAIN_DISTANCE + (float)lx));
int32_t y = (int32_t)(floorf(scn->pos.z - HALF_TERRAIN_DISTANCE + (float)ly));
@ -160,8 +177,21 @@ static void draw_terrain(SceneIngame *scn) {
(Vec3){ (float)x, d3, (float)y - 1 },
(Rect){ .w = 128, .h = 128 },
(Color){255, 255, 255, 255});
}
}
int32_t const rsi_g = (int32_t)GRASS_RADIUS * (int32_t)GRASS_RADIUS;
for (int32_t iy = -(int32_t)GRASS_RADIUS; iy <= (int32_t)GRASS_RADIUS - 1; ++iy) {
int32_t const dx = ceil_sqrt(rsi_g - (iy + (iy <= 0)) * (iy + (iy <= 0)));
for (int32_t ix = -dx; ix < dx; ++ix) {
int32_t lx = ix + TERRAIN_RADIUS;
int32_t ly = iy + TERRAIN_RADIUS;
int32_t x = (int32_t)(floorf(scn->pos.x - HALF_TERRAIN_DISTANCE + (float)lx));
int32_t y = (int32_t)(floorf(scn->pos.z - HALF_TERRAIN_DISTANCE + (float)ly));
float d0 = heightmap[lx][ly];
/* TODO: only draw upclose */
draw_billboard("/assets/grasses/10.png",
(Vec3){ (float)x, d0 + 0.15f, (float)y },
(Vec2){0.3f, 0.3f},
@ -216,7 +246,7 @@ static void ingame_tick(State *state) {
draw_skybox("/assets/miramar/miramar_*.tga");
ctx.fog_color = (Color){ 140, 147, 160, 255 };
ctx.fog_density = 0.03f;
ctx.fog_density = 0.02f;
}