1 files changed, 404 insertions, 0 deletions

diff --git a/demos/window_sdl.c b/demos/window_sdl.c
new file mode 100644
index 0000000..1fd22ce
--- /dev/null
+++ b/demos/window_sdl.c
@@ -0,0 +1,404 @@
+// License: CC0 / Public Domain
+
+#if !defined(USE_GL) && !defined(USE_VK) || defined(USE_GL) && defined(USE_VK)
+#error Specify exactly one of -DUSE_GL or -DUSE_VK when compiling!
+#endif
+
+#include <SDL.h>
+
+#include "common.h"
+#include "window.h"
+
+#ifdef USE_VK
+#define VK_NO_PROTOTYPES
+#include <libplacebo/vulkan.h>
+#include <SDL_vulkan.h>
+#define WINFLAG_API SDL_WINDOW_VULKAN
+#define IMPL win_impl_sdl_vk
+#define IMPL_NAME "SDL2 (vulkan)"
+#define IMPL_TAG "sdl2-vk"
+#endif
+
+#ifdef USE_GL
+#include <libplacebo/opengl.h>
+#define WINFLAG_API SDL_WINDOW_OPENGL
+#define IMPL win_impl_sdl_gl
+#define IMPL_NAME "SDL2 (opengl)"
+#define IMPL_TAG "sdl2-gl"
+#endif
+
+#ifdef NDEBUG
+#define DEBUG false
+#else
+#define DEBUG true
+#endif
+
+const struct window_impl IMPL;
+
+struct priv {
+    struct window w;
+    SDL_Window *win;
+
+#ifdef USE_VK
+    VkSurfaceKHR surf;
+    pl_vulkan vk;
+    pl_vk_inst vk_inst;
+#endif
+
+#ifdef USE_GL
+    SDL_GLContext gl_ctx;
+    pl_opengl gl;
+#endif
+
+    int scroll_dx, scroll_dy;
+    char **files;
+    size_t files_num;
+    size_t files_size;
+    bool file_seen;
+    char *clip_text;
+};
+
+#ifdef USE_GL
+static bool make_current(void *priv)
+{
+    struct priv *p = priv;
+    return SDL_GL_MakeCurrent(p->win, p->gl_ctx) == 0;
+}
+
+static void release_current(void *priv)
+{
+    struct priv *p = priv;
+    SDL_GL_MakeCurrent(p->win, NULL);
+}
+#endif
+
+static struct window *sdl_create(pl_log log, const struct window_params *params)
+{
+    struct priv *p = calloc(1, sizeof(struct priv));
+    if (!p)
+        return NULL;
+
+    p->w.impl = &IMPL;
+    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
+        fprintf(stderr, "SDL2: Failed initializing: %s\n", SDL_GetError());
+        goto error;
+    }
+
+    uint32_t sdl_flags = SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE | WINFLAG_API;
+    p->win = SDL_CreateWindow(params->title, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+                              params->width, params->height, sdl_flags);
+    if (!p->win) {
+        fprintf(stderr, "SDL2: Failed creating window: %s\n", SDL_GetError());
+        goto error;
+    }
+
+    int w, h;
+
+#ifdef USE_VK
+
+    unsigned int num = 0;
+    if (!SDL_Vulkan_GetInstanceExtensions(p->win, &num, NULL)) {
+        fprintf(stderr, "SDL2: Failed enumerating vulkan extensions: %s\n", SDL_GetError());
+        goto error;
+    }
+
+    const char **exts = malloc(num * sizeof(const char *));
+    SDL_Vulkan_GetInstanceExtensions(p->win, &num, exts);
+
+    p->vk_inst = pl_vk_inst_create(log, pl_vk_inst_params(
+        .get_proc_addr = SDL_Vulkan_GetVkGetInstanceProcAddr(),
+        .debug = DEBUG,
+        .extensions = exts,
+        .num_extensions = num,
+    ));
+    free(exts);
+    if (!p->vk_inst) {
+        fprintf(stderr, "libplacebo: Failed creating vulkan instance!\n");
+        goto error;
+    }
+
+    if (!SDL_Vulkan_CreateSurface(p->win, p->vk_inst->instance, &p->surf)) {
+        fprintf(stderr, "SDL2: Failed creating surface: %s\n", SDL_GetError());
+        goto error;
+    }
+
+    p->vk = pl_vulkan_create(log, pl_vulkan_params(
+        .instance = p->vk_inst->instance,
+        .get_proc_addr = p->vk_inst->get_proc_addr,
+        .surface = p->surf,
+        .allow_software = true,
+    ));
+    if (!p->vk) {
+        fprintf(stderr, "libplacebo: Failed creating vulkan device\n");
+        goto error;
+    }
+
+    p->w.swapchain = pl_vulkan_create_swapchain(p->vk, pl_vulkan_swapchain_params(
+        .surface = p->surf,
+        .present_mode = VK_PRESENT_MODE_FIFO_KHR,
+    ));
+
+    if (!p->w.swapchain) {
+        fprintf(stderr, "libplacebo: Failed creating vulkan swapchain\n");
+        goto error;
+    }
+
+    p->w.gpu = p->vk->gpu;
+
+    SDL_Vulkan_GetDrawableSize(p->win, &w, &h);
+#endif // USE_VK
+
+#ifdef USE_GL
+    p->gl_ctx = SDL_GL_CreateContext(p->win);
+    if (!p->gl_ctx) {
+        fprintf(stderr, "SDL2: Failed creating GL context: %s\n", SDL_GetError());
+        goto error;
+    }
+
+    p->gl = pl_opengl_create(log, pl_opengl_params(
+        .allow_software = true,
+        .debug = DEBUG,
+        .make_current = make_current,
+        .release_current = release_current,
+        .get_proc_addr = (void *) SDL_GL_GetProcAddress,
+        .priv = p,
+    ));
+    if (!p->gl) {
+        fprintf(stderr, "libplacebo: Failed creating opengl device\n");
+        goto error;
+    }
+
+    p->w.swapchain = pl_opengl_create_swapchain(p->gl, pl_opengl_swapchain_params(
+        .swap_buffers = (void (*)(void *)) SDL_GL_SwapWindow,
+        .priv = p->win,
+    ));
+
+    if (!p->w.swapchain) {
+        fprintf(stderr, "libplacebo: Failed creating opengl swapchain\n");
+        goto error;
+    }
+
+    p->w.gpu = p->gl->gpu;
+
+    SDL_GL_GetDrawableSize(p->win, &w, &h);
+#endif // USE_GL
+
+    pl_swapchain_colorspace_hint(p->w.swapchain, &params->colors);
+    if (!pl_swapchain_resize(p->w.swapchain, &w, &h)) {
+        fprintf(stderr, "libplacebo: Failed initializing swapchain\n");
+        goto error;
+    }
+
+    return &p->w;
+
+error:
+    window_destroy((struct window **) &p);
+    return NULL;
+}
+
+static void sdl_destroy(struct window **window)
+{
+    struct priv *p = (struct priv *) *window;
+    if (!p)
+        return;
+
+    pl_swapchain_destroy(&p->w.swapchain);
+
+#ifdef USE_VK
+    pl_vulkan_destroy(&p->vk);
+    if (p->surf) {
+        PFN_vkDestroySurfaceKHR vkDestroySurfaceKHR = (PFN_vkDestroySurfaceKHR)
+            p->vk_inst->get_proc_addr(p->vk_inst->instance, "vkDestroySurfaceKHR");
+        vkDestroySurfaceKHR(p->vk_inst->instance, p->surf, NULL);
+    }
+    pl_vk_inst_destroy(&p->vk_inst);
+#endif
+
+#ifdef USE_GL
+    pl_opengl_destroy(&p->gl);
+    SDL_GL_DeleteContext(p->gl_ctx);
+#endif
+
+    for (int i = 0; i < p->files_num; i++)
+        SDL_free(p->files[i]);
+    free(p->files);
+
+    SDL_free(p->clip_text);
+    SDL_DestroyWindow(p->win);
+    SDL_Quit();
+    free(p);
+    *window = NULL;
+}
+
+static inline void handle_event(struct priv *p, SDL_Event *event)
+{
+    switch (event->type) {
+    case SDL_QUIT:
+        p->w.window_lost = true;
+        return;
+
+    case SDL_WINDOWEVENT:
+        if (event->window.windowID != SDL_GetWindowID(p->win))
+            return;
+
+        if (event->window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
+            int width = event->window.data1, height = event->window.data2;
+            if (!pl_swapchain_resize(p->w.swapchain, &width, &height)) {
+                fprintf(stderr, "libplacebo: Failed resizing swapchain? Exiting...\n");
+                p->w.window_lost = true;
+            }
+        }
+        return;
+
+    case SDL_MOUSEWHEEL:
+        p->scroll_dx += event->wheel.x;
+        p->scroll_dy += event->wheel.y;
+        return;
+
+    case SDL_DROPFILE:
+        if (p->files_num == p->files_size) {
+            size_t new_size = p->files_size ? p->files_size * 2 : 16;
+            char **new_files = realloc(p->files, new_size * sizeof(char *));
+            if (!new_files)
+                return;
+            p->files = new_files;
+            p->files_size = new_size;
+        }
+
+        p->files[p->files_num++] = event->drop.file;
+        return;
+    }
+}
+
+static void sdl_poll(struct window *window, bool block)
+{
+    struct priv *p = (struct priv *) window;
+    SDL_Event event;
+    int ret;
+
+    do {
+        ret = block ? SDL_WaitEvent(&event) : SDL_PollEvent(&event);
+        if (ret)
+            handle_event(p, &event);
+
+        // Only block on the first iteration
+        block = false;
+    } while (ret);
+}
+
+static void sdl_get_cursor(const struct window *window, int *x, int *y)
+{
+    SDL_GetMouseState(x, y);
+}
+
+static bool sdl_get_button(const struct window *window, enum button btn)
+{
+    static const uint32_t button_mask[] = {
+        [BTN_LEFT] = SDL_BUTTON_LMASK,
+        [BTN_RIGHT] = SDL_BUTTON_RMASK,
+        [BTN_MIDDLE] = SDL_BUTTON_MMASK,
+    };
+
+    return SDL_GetMouseState(NULL, NULL) & button_mask[btn];
+}
+
+static bool sdl_get_key(const struct window *window, enum key key)
+{
+    static const size_t key_map[] = {
+        [KEY_ESC] = SDL_SCANCODE_ESCAPE,
+    };
+
+    return SDL_GetKeyboardState(NULL)[key_map[key]];
+}
+
+static void sdl_get_scroll(const struct window *window, float *dx, float *dy)
+{
+    struct priv *p = (struct priv *) window;
+    *dx = p->scroll_dx;
+    *dy = p->scroll_dy;
+    p->scroll_dx = p->scroll_dy = 0;
+}
+
+static char *sdl_get_file(const struct window *window)
+{
+    struct priv *p = (struct priv *) window;
+    if (p->file_seen) {
+        assert(p->files_num);
+        SDL_free(p->files[0]);
+        memmove(&p->files[0], &p->files[1], --p->files_num * sizeof(char *));
+        p->file_seen = false;
+    }
+
+    if (!p->files_num)
+        return NULL;
+
+    p->file_seen = true;
+    return p->files[0];
+}
+
+static bool sdl_is_fullscreen(const struct window *window)
+{
+    const struct priv *p = (const struct priv *) window;
+    return SDL_GetWindowFlags(p->win) & SDL_WINDOW_FULLSCREEN;
+}
+
+static bool sdl_toggle_fullscreen(const struct window *window, bool fullscreen)
+{
+    struct priv *p = (struct priv *) window;
+    bool window_fullscreen = sdl_is_fullscreen(window);
+
+    if (window_fullscreen == fullscreen)
+        return true;
+
+    SDL_DisplayMode mode;
+    if (SDL_GetDesktopDisplayMode(0, &mode))
+    {
+        fprintf(stderr, "SDL2: Failed to get display mode: %s\n", SDL_GetError());
+        SDL_ClearError();
+        return false;
+    }
+
+    if (SDL_SetWindowDisplayMode(p->win, &mode))
+    {
+        fprintf(stderr, "SDL2: Failed to set window display mode: %s\n", SDL_GetError());
+        SDL_ClearError();
+        return false;
+    }
+
+    if (SDL_SetWindowFullscreen(p->win, fullscreen ? SDL_WINDOW_FULLSCREEN : 0)) {
+        fprintf(stderr, "SDL2: SetWindowFullscreen failed: %s\n", SDL_GetError());
+        SDL_ClearError();
+        return false;
+    }
+
+    return true;
+}
+
+static const char *sdl_get_clipboard(const struct window *window)
+{
+    struct priv *p = (struct priv *) window;
+    SDL_free(p->clip_text);
+    return p->clip_text = SDL_GetClipboardText();
+}
+
+static void sdl_set_clipboard(const struct window *window, const char *text)
+{
+    SDL_SetClipboardText(text);
+}
+
+const struct window_impl IMPL = {
+    .name = IMPL_NAME,
+    .tag = IMPL_TAG,
+    .create = sdl_create,
+    .destroy = sdl_destroy,
+    .poll = sdl_poll,
+    .get_cursor = sdl_get_cursor,
+    .get_button = sdl_get_button,
+    .get_key = sdl_get_key,
+    .get_scroll = sdl_get_scroll,
+    .get_file = sdl_get_file,
+    .toggle_fullscreen = sdl_toggle_fullscreen,
+    .is_fullscreen = sdl_is_fullscreen,
+    .get_clipboard = sdl_get_clipboard,
+    .set_clipboard = sdl_set_clipboard,
+};