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/*
* handmade: everything in one file, on the raw libs only
*
* no program module, no assets, no build script. copy these headers next to this file:
* konwinlib.h konsofren.h kontime.h konmath.h konsector.h
* and build it (linux): cc -std=c99 -o handmade handmade.c -lX11 -lXext -lXrandr -lm
* (windows): cc -std=c99 -o handmade.exe handmade.c -lgdi32 -lm
*
* the map is text inside this file and the gem is a list of vertices. w and s walk, a and d strafe, left and right turn, escape quits
*/
#define KONWINLIB_IMPLEMENTATION
#define KONSOFREN_IMPLEMENTATION
#define KONTIME_IMPLEMENTATION
#define KONSECTOR_IMPLEMENTATION
#include <stdio.h>
#include <math.h>
#include <string.h>
#include "konwinlib.h"
#include "konsofren.h"
#include "kontime.h"
#include "konmath.h"
#include "konsector.h"
#define GAME_WIDTH 320
#define GAME_HEIGHT 180
#define EYE 0.8f
#define RADIUS 0.25f
/*** the map ***/
/* x goes east, z goes south, corners go counter clockwise seen from above. two rooms and a short passage, and a picture on the east wall of the far room */
static const char crypt[] =
"kmap 1\n"
"v 0 0\n"
"v 0 6\n"
"v 6 6\n"
"v 6 4\n"
"v 6 2\n"
"v 6 0\n"
"v 10 2\n"
"v 10 4\n"
"v 16 6\n"
"v 16 0\n"
"sector 0 3 light 0.9 floor stone ceiling stone wall brick : 0 1 2 3 4 5\n"
"sector 0 2.2 light 0.5 floor stone ceiling stone wall brick : 4 3 7 6\n"
"sector 0 4 light 0.7 floor stone ceiling stone wall plaster : 6 7 8 9\n"
"entity spawn 2 0.8 3 0\n"
"quad mark 15.95 0.4 2 15.95 0.4 4 15.95 2.4 4 15.95 2.4 2 light 0.8\n";
/*** the gem ***/
#define V(x, y, z, nx, ny, nz) { { x, y, z }, { nx, ny, nz }, { 0, 0 } }
static const kon_vertex_t gemVertices[24] = {
V(1, 0, 0, 0.577, 0.577, 0.577), V(0, 1, 0, 0.577, 0.577, 0.577), V(0, 0, 1, 0.577, 0.577, 0.577),
V(1, 0, 0, 0.577, 0.577, -0.577), V(0, 0, -1, 0.577, 0.577, -0.577), V(0, 1, 0, 0.577, 0.577, -0.577),
V(1, 0, 0, 0.577, -0.577, 0.577), V(0, 0, 1, 0.577, -0.577, 0.577), V(0, -1, 0, 0.577, -0.577, 0.577),
V(1, 0, 0, 0.577, -0.577, -0.577), V(0, -1, 0, 0.577, -0.577, -0.577), V(0, 0, -1, 0.577, -0.577, -0.577),
V(-1, 0, 0, -0.577, 0.577, 0.577), V(0, 0, 1, -0.577, 0.577, 0.577), V(0, 1, 0, -0.577, 0.577, 0.577),
V(-1, 0, 0, -0.577, 0.577, -0.577), V(0, 1, 0, -0.577, 0.577, -0.577), V(0, 0, -1, -0.577, 0.577, -0.577),
V(-1, 0, 0, -0.577, -0.577, 0.577), V(0, -1, 0, -0.577, -0.577, 0.577), V(0, 0, 1, -0.577, -0.577, 0.577),
V(-1, 0, 0, -0.577, -0.577, -0.577), V(0, 0, -1, -0.577, -0.577, -0.577), V(0, -1, 0, -0.577, -0.577, -0.577),
};
static const uint16_t gemIndices[24] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23
};
static const kon_mesh_t gem = { gemVertices, gemIndices, 8 };
/*** state ***/
typedef struct state {
kon_window_t *window;
kon_display_t *display;
kon_sectorMap_t *map;
kon_sectorMesh_t *mesh;
kon_material_t materials[8];
kon_image *mark;
float x, z, yaw;
int sector;
int forward, strafe, turn;
kon_time last, time;
} state_t;
/*** images made in code ***/
static kon_image *makeMark(void)
{
kon_image *image = kon_createFramebuffer(32, 40);
int i;
if (!image) return NULL;
kon_clearFramebuffer(image, 0xFFF2A7C3);
kon_fillRectangle(image, 2, 2, 28, 36, 0xFF332E4E);
for (i = 0; i < 28; i++) {
kon_fillRectangle(image, 2 + i, 2 + i * 36 / 28, 1, 1, 0xFFF2A7C3);
kon_fillRectangle(image, 2 + i, 37 - i * 36 / 28, 1, 1, 0xFFF2A7C3);
}
return image;
}
static uint32_t colorOf(const char *name)
{
if (!strcmp(name, "stone")) return 0xFF6C6688;
if (!strcmp(name, "brick")) return 0xFF8A5560;
if (!strcmp(name, "plaster")) return 0xFFB5AECB;
return 0xFF9A93B3;
}
/*** moving ***/
/* the four corners of the body all have to be inside some room */
static int fits(const state_t *state, float x, float z)
{
static const float dx[4] = { -1, 1, 1, -1 }, dz[4] = { -1, -1, 1, 1 };
int i;
for (i = 0; i < 4; i++) {
if (kon_sectorAt(state->map, x + dx[i] * RADIUS, z + dz[i] * RADIUS, state->sector) < 0) return 0;
}
return 1;
}
static void walk(state_t *state, float dx, float dz)
{
if (fits(state, state->x + dx, state->z + dz)) {
state->x += dx;
state->z += dz;
} else if (fits(state, state->x + dx, state->z)) {
state->x += dx;
} else if (fits(state, state->x, state->z + dz)) {
state->z += dz;
}
state->sector = kon_sectorAt(state->map, state->x, state->z, state->sector);
}
/*** the loop ***/
static void frame(void *data)
{
state_t *state = data;
kon_framebuffer_t *game = state->display->game;
kon_camera_t camera = kon_cameraDefault();
kon_light_t light = kon_lightDefault();
kon_event_t ev;
kon_time now = kon_getTime(), dt = now - state->last;
float fx = sinf(state->yaw), fz = -cosf(state->yaw), step = 2.0f * (float)dt;
kon_mat4_t vp;
state->last = now;
if (dt > 0.25) dt = 0.25;
state->time += dt;
while (kon_pollEvent(state->window, &ev)) {
int down = ev.type == KON_EVENT_KEY_DOWN;
if (ev.type == KON_EVENT_RESIZE) kon_resizeDisplay(state->display, ev.width, ev.height);
if (ev.type != KON_EVENT_KEY_DOWN && ev.type != KON_EVENT_KEY_UP) continue;
switch (ev.key) {
case KON_KEY_W: state->forward = down ? 1 : (state->forward > 0 ? 0 : state->forward); break;
case KON_KEY_S: state->forward = down ? -1 : (state->forward < 0 ? 0 : state->forward); break;
case KON_KEY_D: state->strafe = down ? 1 : (state->strafe > 0 ? 0 : state->strafe); break;
case KON_KEY_A: state->strafe = down ? -1 : (state->strafe < 0 ? 0 : state->strafe); break;
case KON_KEY_RIGHT: state->turn = down ? 1 : (state->turn > 0 ? 0 : state->turn); break;
case KON_KEY_LEFT: state->turn = down ? -1 : (state->turn < 0 ? 0 : state->turn); break;
default: break;
}
}
state->yaw += (float)state->turn * 2.0f * (float)dt;
walk(state, (fx * (float)state->forward - fz * (float)state->strafe) * step, (fz * (float)state->forward + fx * (float)state->strafe) * step);
camera.position = KON_VEC3(state->x, state->map->sectors[state->sector].floor + EYE, state->z);
camera.target = KON_VEC3(state->x + fx, camera.position.y, state->z + fz);
camera.fov = KON_DEG2RAD(60);
camera.nearZ = 0.05f;
camera.farZ = 40.0f;
vp = kon_cameraViewProjection(&camera, game->width, game->height);
kon_clearFramebuffer(game, 0xFF1B1826);
light.direction = KON_VEC3(-0.3f, -1.0f, -0.2f);
light.ambient = 0.5f;
kon_sectorDraw(game, &camera, state->mesh, state->materials, state->map->textureCount, &light);
kon_drawMesh(game, vp, kon_mat4FromTransform(KON_VEC3(13.0f, 1.2f, 3.5f), KON_VEC3(0.0f, (float)state->time, 0.0f), KON_VEC3(0.4f, 0.6f, 0.4f)), &gem,
&state->materials[7], &light, KON_RENDER_DEFAULT);
kon_presentDisplay(state->display);
kon_blitPixels(state->window, state->display->screen->data, state->display->screen->width, state->display->screen->height);
kon_sleep(0.004);
}
int main(void)
{
static state_t state;
char error[160];
int i;
state.map = kon_sectorParse(crypt, error, sizeof(error));
if (!state.map) {
fprintf(stderr, "map: %s\n", error);
return 1;
}
state.mesh = kon_sectorBuild(state.map);
state.mark = makeMark();
for (i = 0; i < state.map->textureCount && i < 7; i++) {
state.materials[i] = strcmp(state.map->textures[i], "mark") == 0 ? kon_materialTexture(state.mark) : kon_materialColor(colorOf(state.map->textures[i]));
}
state.materials[7] = kon_materialColor(0xFF8FD3C8);
if (!state.mesh || !state.mark || !kon_init()) return 1;
state.window = kon_createWindow("handmade", 0, 0, GAME_WIDTH * 3, GAME_HEIGHT * 3, KON_WINDOW_CENTER | KON_WINDOW_RESIZABLE);
if (!state.window) return 1;
kon_setExitKey(state.window, KON_KEY_ESCAPE);
state.display = kon_createDisplay(GAME_WIDTH, GAME_HEIGHT, GAME_WIDTH * 3, GAME_HEIGHT * 3);
if (!state.display) return 1;
state.x = state.map->entities[0].position.x;
state.z = state.map->entities[0].position.z;
state.sector = kon_sectorAt(state.map, state.x, state.z, -1);
state.last = kon_getTime();
kon_runMainLoop(state.window, frame, &state);
kon_freeDisplay(state.display);
kon_destroyWindow(state.window);
kon_deinit();
kon_sectorMeshFree(state.mesh);
kon_sectorFree(state.map);
kon_freeFramebuffer(state.mark);
return 0;
}
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