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238 lines
6.0 KiB
C

//------------------------------------------------------------------------------
// Take flight
//------------------------------------------------------------------------------
#define SOKOL_IMPL
#define SOKOL_D3D11
#include "sokol_gfx.h"
#include "sokol_gp.h"
#include "sokol_app.h"
#include "sokol_glue.h"
#define MAX_BOXES 32
#define BOX_SIZE 0.5f
#define TIMESTEP 1.0f / 60.0f
struct Body
{
sgp_point position;
sgp_point old_position;
sgp_vec2 acceleration;
};
struct GameState
{
struct Player
{
struct Body body;
} player;
int num_boxes;
struct Box
{
struct Body body;
} boxes[MAX_BOXES];
};
struct GameState gs = {0};
bool mouse_down = false;
bool keydown[SAPP_KEYCODE_MENU] = {0};
float funval = 0.0f; // easy to play with value controlled by left mouse button when held down @BeforeShip remove on release builds
void init(void)
{
// @BeforeShip make all fprintf into logging to file, warning dialog boxes on failure instead of exit(-1), replace the macros in sokol with this as well, like assert
sg_desc sgdesc = {.context = sapp_sgcontext()};
sg_setup(&sgdesc);
if (!sg_isvalid())
{
fprintf(stderr, "Failed to create Sokol GFX context!\n");
exit(-1);
}
gs.boxes[0] = (struct Box){
.body = (struct Body){
.position = (sgp_point){.x = 0.75f, .y = 0.0}},
};
gs.boxes[0].body.old_position = gs.boxes[0].body.position;
gs.boxes[1] = (struct Box){
.body = (struct Body){
.position = (sgp_point){.x = 0.75f, .y = 0.5f}},
};
gs.boxes[1].body.old_position = gs.boxes[1].body.position;
gs.num_boxes = 2;
sgp_desc sgpdesc = {0};
sgp_setup(&sgpdesc);
if (!sgp_is_valid())
{
fprintf(stderr, "Failed to create Sokol GP context: %s\n", sgp_get_error_message(sgp_get_last_error()));
exit(-1);
}
}
sgp_vec2 v2add(sgp_vec2 a, sgp_vec2 b)
{
return (sgp_vec2){
.x = a.x + b.x,
.y = a.y + b.y,
};
}
sgp_vec2 v2scale(sgp_vec2 a, float f)
{
return (sgp_vec2){
.x = a.x * f,
.y = a.y * f,
};
}
sgp_vec2 v2sub(sgp_vec2 a, sgp_vec2 b)
{
return (sgp_vec2){
.x = a.x - b.x,
.y = a.y - b.y,
};
}
void process_body(struct Body *body)
{
sgp_vec2 current = body->position;
body->position = v2add(body->position, v2sub(current, body->old_position));
body->position = v2add(body->position, v2scale(body->acceleration, TIMESTEP*TIMESTEP));
body->old_position = current;
}
void frame(void)
{
int width = sapp_width(), height = sapp_height();
float ratio = width / (float)height;
float time = sapp_frame_count() * sapp_frame_duration();
// gameplay
{
sgp_vec2 input = (sgp_vec2){
.x = (float)keydown[SAPP_KEYCODE_D] - (float)keydown[SAPP_KEYCODE_A],
.y = (float)keydown[SAPP_KEYCODE_S] - (float)keydown[SAPP_KEYCODE_W],
};
gs.player.body.acceleration = v2scale(input, 5.0f);
process_body(&gs.player.body);
for(int i = 0; i < gs.num_boxes; i++)
{
process_body(&gs.boxes[i].body);
}
}
// drawing
{
sgp_begin(width, height);
sgp_viewport(0, 0, width, height);
// sgp_project(-ratio, ratio, 1.0f, -1.0f);
sgp_project(0.0f, width, 0.0f, height);
// Draw background color
sgp_set_color(0.1f, 0.1f, 0.1f, 1.0f);
sgp_clear();
// Drawing in world space now
sgp_translate(width / 2, height / 2);
sgp_scale_at(300.0f + funval, 300.0f + funval, 0.0f, 0.0f);
sgp_translate(-gs.player.body.position.x, -gs.player.body.position.y);
sgp_set_color(1.0f, 1.0f, 1.0f, 1.0f);
sgp_draw_filled_rect(100.0f, 100.0f, 400.0f, 400.0f);
// stars
const int num = 50;
for (int x = -num; x < num; x++)
{
for (int y = -num; y < num; y++)
{
sgp_draw_point((float)x * 0.1f, (float)y * 0.1f);
}
}
float halfbox = BOX_SIZE / 2.0f;
// player
{
sgp_set_color(1.0f, 1.0f, 1.0f, 1.0f);
sgp_draw_filled_rect(gs.player.body.position.x - halfbox, gs.player.body.position.y - halfbox, BOX_SIZE, BOX_SIZE);
}
// boxes
{
sgp_set_color(0.5f, 0.5f, 0.5f, 1.0f);
for (int i = 0; i < gs.num_boxes; i++)
{
sgp_draw_filled_rect(gs.boxes[i].body.position.x - halfbox, gs.boxes[i].body.position.y - halfbox, BOX_SIZE, BOX_SIZE);
}
}
// sgp_draw_line(5.0f, 5.0f, 5.0f, 10.0f);
// sgp_draw_line()
// sgp_rotate_at(time, 0.0f, 0.0f);
// Begin a render pass.
sg_pass_action pass_action = {0};
sg_begin_default_pass(&pass_action, width, height);
sgp_flush();
sgp_end();
sg_end_pass();
sg_commit();
}
}
void cleanup(void)
{
sgp_shutdown();
sg_shutdown();
}
void event(const sapp_event *e)
{
switch (e->type)
{
case SAPP_EVENTTYPE_KEY_DOWN:
keydown[e->key_code] = true;
break;
case SAPP_EVENTTYPE_KEY_UP:
keydown[e->key_code] = false;
break;
case SAPP_EVENTTYPE_MOUSE_DOWN:
if (e->mouse_button == SAPP_MOUSEBUTTON_LEFT)
mouse_down = true;
break;
case SAPP_EVENTTYPE_MOUSE_UP:
if (e->mouse_button == SAPP_MOUSEBUTTON_LEFT)
mouse_down = false;
break;
case SAPP_EVENTTYPE_MOUSE_MOVE:
if (mouse_down)
{
funval += e->mouse_dx;
printf("Funval %f\n", funval);
}
break;
}
}
sapp_desc sokol_main(int argc, char *argv[])
{
(void)argc;
(void)argv;
return (sapp_desc){
.init_cb = init,
.frame_cb = frame,
.cleanup_cb = cleanup,
.width = 640,
.height = 480,
.gl_force_gles2 = true,
.window_title = "Flight",
.icon.sokol_default = true,
.event_cb = event,
.win32_console_attach = true,
.sample_count = 4, // anti aliasing
};
}