diff options
Diffstat (limited to 'src/os/sdl/sdl_window.c')
| -rw-r--r-- | src/os/sdl/sdl_window.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src/os/sdl/sdl_window.c b/src/os/sdl/sdl_window.c new file mode 100644 index 0000000..000ed50 --- /dev/null +++ b/src/os/sdl/sdl_window.c @@ -0,0 +1,171 @@ +#include <os/os.h> +#include <SDL3/SDL_events.h> +#include <SDL3/SDL.h> +#include <GL/gl.h> + + +struct OSWindow { + SDL_Window *sdl_window; + SDL_GLContext gl_context; + u32 gl_texture_id; + OSOffscreenBuffer offscreen_buffer; +}; + + +static void +os_offscreen_buffer_reinit(OSOffscreenBuffer *buffer, i32 w, i32 h) +{ + void *realloced_pixels = realloc(buffer->pixels, w*h*sizeof(buffer->pixels[0])); + if (!realloced_pixels) { + printf("could not resize offscreen buffer\n"); + return; + } + buffer->green_shift = 8; + buffer->blue_shift = 16; + buffer->red_shift = 0; + buffer->alpha_shift = 24; + buffer->width = w; + buffer->height = h; + buffer->pixels = realloced_pixels; +} + +static void +os_offscreen_buffer_deinit(OSOffscreenBuffer *buffer) +{ + buffer->width = 0; + buffer->height = 0; + free(buffer->pixels); +} + + +OSWindow * +os_window_create(const char *name, i32 width, i32 height) +{ + OSWindow *window = malloc(sizeof(*window)); + memset(window, 0, sizeof(*window)); + + SDL_Window *sdl_window = SDL_CreateWindow(name, width, height, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE); + if (!sdl_window) { + printf("SDL_CreateWindow failed\n"); + return 0; + } + + + SDL_GLContext gl_context = SDL_GL_CreateContext(sdl_window); + + glEnable(GL_TEXTURE_2D); + glActiveTexture(GL_TEXTURE0); + + glGenTextures(1, &window->gl_texture_id); + glBindTexture(GL_TEXTURE_2D, window->gl_texture_id); + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + + + window->sdl_window = sdl_window; + window->gl_context = gl_context; + os_offscreen_buffer_reinit(&window->offscreen_buffer, width, height); + + return window; +} + +void +os_window_destroy(OSWindow *window) +{ + os_offscreen_buffer_deinit(&window->offscreen_buffer); + SDL_GL_DestroyContext(window->gl_context); + SDL_DestroyWindow(window->sdl_window); + free(window); +} + +b32 +os_window_get_event(OSWindow *window, OSEvent *event) +{ + SDL_Window *sdl_window = window->sdl_window; + SDL_Event sdl_event; + if (SDL_PollEvent(&sdl_event)) { + if (sdl_event.type == SDL_EVENT_WINDOW_DESTROYED) { + event->type = OS_EVENT_WINDOW_DESTROYED; + return true; + } + else if (sdl_event.type == SDL_EVENT_WINDOW_CLOSE_REQUESTED) { + SDL_DestroyWindow(sdl_window); + event->type = OS_EVENT_WINDOW_DESTROYED; + return true; + } + else if (sdl_event.type == SDL_EVENT_WINDOW_RESIZED) { + event->type = OS_EVENT_WINDOW_RESIZE; + event->ev.resize.width = sdl_event.window.data1; + event->ev.resize.height = sdl_event.window.data2; + os_offscreen_buffer_reinit(&window->offscreen_buffer, sdl_event.window.data1, sdl_event.window.data2); + return true; + } + else if (sdl_event.type == SDL_EVENT_KEY_DOWN) { + if ((sdl_event.key.key >= SDLK_SPACE && sdl_event.key.key <= SDLK_TILDE) || + sdl_event.key.key == '\t' || + sdl_event.key.key == '\r' || + sdl_event.key.key == '\b' || + sdl_event.key.key == SDLK_DELETE) + { + event->type = OS_EVENT_KEY_PRESS; + event->ev.key_press.is_unicode = true; + event->ev.key_press.code = sdl_event.key.key; + return true; + } + else if (sdl_event.key.key == SDLK_LEFT) { + event->type = OS_EVENT_KEY_PRESS; + event->ev.key_press.is_unicode = false; + event->ev.key_press.code = OS_KEYCODE_LEFT; + return true; + } + else if (sdl_event.key.key == SDLK_RIGHT) { + event->type = OS_EVENT_KEY_PRESS; + event->ev.key_press.is_unicode = false; + event->ev.key_press.code = OS_KEYCODE_RIGHT; + return true; + } + else if (sdl_event.key.key == SDLK_UP) { + event->type = OS_EVENT_KEY_PRESS; + event->ev.key_press.is_unicode = false; + event->ev.key_press.code = OS_KEYCODE_UP; + return true; + } + else if (sdl_event.key.key == SDLK_DOWN) { + event->type = OS_EVENT_KEY_PRESS; + event->ev.key_press.is_unicode = false; + event->ev.key_press.code = OS_KEYCODE_DOWN; + return true; + } + } + } + + return false; +} + +OSOffscreenBuffer* +os_window_get_offscreen_buffer(OSWindow *window) +{ + return &window->offscreen_buffer; +} + +void os_window_swap_buffers(OSWindow *window, OSOffscreenBuffer *offscreen_buffer) +{ + glActiveTexture(GL_TEXTURE0); + glBindTexture(GL_TEXTURE_2D, window->gl_texture_id); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, offscreen_buffer->width, offscreen_buffer->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, offscreen_buffer->pixels); + + glBegin(GL_QUADS); + glTexCoord2f(0.0f, 0.0f); glVertex2f(-1.0f, -1.0f); + glTexCoord2f(1.0f, 0.0f); glVertex2f( 1.0f, -1.0f); + glTexCoord2f(1.0f, 1.0f); glVertex2f( 1.0f, 1.0f); + glTexCoord2f(0.0f, 1.0f); glVertex2f(-1.0f, 1.0f); + glEnd(); + + glBindTexture(GL_TEXTURE_2D, 0); + + SDL_GL_SwapWindow(window->sdl_window); +} + |