diff options
Diffstat (limited to 'src/engine/sdl_linux.c')
| -rw-r--r-- | src/engine/sdl_linux.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/src/engine/sdl_linux.c b/src/engine/sdl_linux.c new file mode 100644 index 0000000..76851df --- /dev/null +++ b/src/engine/sdl_linux.c @@ -0,0 +1,203 @@ +#include "GL/glew.h" +#include "SDL2/SDL.h" + +#include "prge.h" + +#include "game.h" +#include "game.c" + +void process_mouse_pos(Input *input, S32 x, S32 y) +{ + V2 pos = v2((F32)x, (F32)y); + if (input->first_mouse) { + input->mouse_pos = pos; + input->first_mouse = 0; + } + input->last_mouse_pos = input->mouse_pos; + input->mouse_pos = pos; + input->mouse_offset = v2sub(input->mouse_pos, + input->last_mouse_pos); +} + +void process_window_resize() +{ +} + +void process_key(U8 state, Key *key) +{ + key->state = (state == SDL_PRESSED) ? KeyState_PRESS : KeyState_RELEASE; +} + +void process_keyboard(Input *input, SDL_KeyboardEvent *key) +{ + switch (key->keysym.scancode) { + case SDL_SCANCODE_D: + process_key(key->state, &input->move_right); + break; + case SDL_SCANCODE_W: + process_key(key->state, &input->move_forward); + break; + case SDL_SCANCODE_A: + process_key(key->state, &input->move_left); + break; + case SDL_SCANCODE_S: + process_key(key->state, &input->move_backward); + break; + case SDL_SCANCODE_E: + process_key(key->state, &input->move_up); + break; + case SDL_SCANCODE_Q: + process_key(key->state, &input->move_down); + break; + case SDL_SCANCODE_SPACE: + process_key(key->state, &input->jump); + break; + case SDL_SCANCODE_RIGHT: + process_key(key->state, &input->action_right); + break; + case SDL_SCANCODE_UP: + process_key(key->state, &input->action_up); + break; + case SDL_SCANCODE_LEFT: + process_key(key->state, &input->action_left); + break; + case SDL_SCANCODE_DOWN: + process_key(key->state, &input->action_down); + break; + case SDL_SCANCODE_ESCAPE: + process_key(key->state, &input->exit); + break; + default: + break; + } +} + +void handle_events(Input *input) +{ + SDL_Event event; + while (SDL_PollEvent(&event)) { + switch (event.type) { + case SDL_KEYDOWN: + case SDL_KEYUP: + process_keyboard(input, &event.key); + break; + case SDL_MOUSEMOTION: + process_mouse_pos(input, event.motion.x, event.motion.y); + break; + case SDL_WINDOWEVENT_RESIZED: + process_window_resize(); + break; + default: + break; + } + } +} + +F32 get_elapsed_seconds(U64 cur, U64 last) +{ + F32 result = ((F32)cur-(F32)last)/1000.0f; + return result; +} + +F32 lock_framerate(U64 last, F32 target) +{ + F32 target_mspf = 1000.0f/target; + + F32 elapsed = get_elapsed_seconds(SDL_GetTicks64(), last)*1000.0f; + + if (elapsed < target_mspf) { + /* F32 sleep = target_mspf-elapsed-1.0f; */ + F32 sleep = target_mspf-elapsed; + if (sleep > 0.0f) + SDL_Delay(sleep); + /* + do { + elapsed = get_elapsed_seconds(SDL_GetTicks64(), last)*1000.0f; + } while (elapsed < target_mspf); + */ + } + + F32 dt = get_elapsed_seconds(SDL_GetTicks64(), last); + + return dt; +} + +B32 sdl_init(S32 width, S32 height, + SDL_Window **window, + SDL_GLContext **context) +{ + if (SDL_Init(SDL_INIT_VIDEO)) { + SDL_Log("[ERROR] : SDL : %s\n", SDL_GetError()); + return 0; + } + + SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3); + SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3); + SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, + SDL_GL_CONTEXT_PROFILE_CORE); + + U32 flags = SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE; + (*window) = SDL_CreateWindow("prge game example", + SDL_WINDOWPOS_CENTERED, + SDL_WINDOWPOS_CENTERED, + width, height, flags); + + if (!(*window)) { + SDL_Log("[ERROR] : SDL : %s\n", SDL_GetError()); + return 0; + } + + (*context) = SDL_GL_CreateContext((*window)); + if (!(*context)) { + SDL_Log("[ERROR] : SDL : %s\n", SDL_GetError()); + return 0; + } + + GLenum error = glewInit(); + if (error != GLEW_OK) { + SDL_Log("[ERROR] : GLEW : %s\n", glewGetErrorString(error)); + return 0; + } + + return 1; +} + +int main(void) +{ + /* NOTE(pryazha): Engine init */ + Input input = input_init(); + S32 width = 800, height = 600; + + /* NOTE(pryazha): SDL init */ + SDL_Window *window; + SDL_GLContext *context; + if (!sdl_init(width, height, &window, &context)) { + SDL_Quit(); + return 1; + } + + /* NOTE(pryazha): Game init */ + State state = {0}; + game_init(&state); + + U64 last = SDL_GetTicks64(); + while (input.is_running) { + handle_events(&input); + + input.dt = lock_framerate(last, 60.0f); + last = SDL_GetTicks64(); + + game_update_and_render(&state, &input); + + input_update(&input); + + SDL_GL_SwapWindow(window); + } + + game_clear(&state); + + SDL_GL_DeleteContext(context); + SDL_DestroyWindow(window); + SDL_Quit(); + return 0; +} |