1 files changed, 281 insertions, 0 deletions
diff --git a/demos/sdlimage.c b/demos/sdlimage.c
new file mode 100644
index 0000000..87e6d03
--- /dev/null
+++ b/demos/sdlimage.c
@@ -0,0 +1,281 @@
+/* Simple image viewer that opens an image using SDL2_image and presents it
+ * to the screen.
+ *
+ * License: CC0 / Public Domain
+ */
+
+#include <SDL_image.h>
+
+#include "common.h"
+#include "window.h"
+
+#include <libplacebo/renderer.h>
+#include <libplacebo/shaders/lut.h>
+#include <libplacebo/utils/upload.h>
+
+// Static configuration, done in the file to keep things simple
+static const char *icc_profile = ""; // path to ICC profile
+static const char *lut_file = ""; // path to .cube lut
+
+// Program state
+static pl_log logger;
+static struct window *win;
+
+// For rendering
+static pl_tex img_tex;
+static pl_tex osd_tex;
+static struct pl_plane img_plane;
+static struct pl_plane osd_plane;
+static pl_renderer renderer;
+static struct pl_custom_lut *lut;
+
+struct file
+{
+    void *data;
+    size_t size;
+};
+
+static struct file icc_file;
+
+static bool open_file(const char *path, struct file *out)
+{
+    if (!path || !path[0]) {
+        *out = (struct file) {0};
+        return true;
+    }
+
+    FILE *fp = NULL;
+    bool success = false;
+
+    fp = fopen(path, "rb");
+    if (!fp)
+        goto done;
+
+    if (fseeko(fp, 0, SEEK_END))
+        goto done;
+    off_t size = ftello(fp);
+    if (size < 0)
+        goto done;
+    if (fseeko(fp, 0, SEEK_SET))
+        goto done;
+
+    void *data = malloc(size);
+    if (!fread(data, size, 1, fp))
+        goto done;
+
+    *out = (struct file) {
+        .data = data,
+        .size = size,
+    };
+
+    success = true;
+done:
+    if (fp)
+        fclose(fp);
+    return success;
+}
+
+static void close_file(struct file *file)
+{
+    if (!file->data)
+        return;
+
+    free(file->data);
+    *file = (struct file) {0};
+}
+
+SDL_NORETURN static void uninit(int ret)
+{
+    pl_renderer_destroy(&renderer);
+    pl_tex_destroy(win->gpu, &img_tex);
+    pl_tex_destroy(win->gpu, &osd_tex);
+    close_file(&icc_file);
+    pl_lut_free(&lut);
+
+    window_destroy(&win);
+    pl_log_destroy(&logger);
+    exit(ret);
+}
+
+static bool upload_plane(const SDL_Surface *img, pl_tex *tex,
+                         struct pl_plane *plane)
+{
+    if (!img)
+        return false;
+
+    SDL_Surface *fixed = NULL;
+    const SDL_PixelFormat *fmt = img->format;
+    if (SDL_ISPIXELFORMAT_INDEXED(fmt->format)) {
+        // libplacebo doesn't handle indexed formats yet
+        fixed = SDL_CreateRGBSurfaceWithFormat(0, img->w, img->h, 32,
+                                               SDL_PIXELFORMAT_ABGR8888);
+        SDL_BlitSurface((SDL_Surface *) img, NULL, fixed, NULL);
+        img = fixed;
+        fmt = img->format;
+    }
+
+    struct pl_plane_data data = {
+        .type           = PL_FMT_UNORM,
+        .width          = img->w,
+        .height         = img->h,
+        .pixel_stride   = fmt->BytesPerPixel,
+        .row_stride     = img->pitch,
+        .pixels         = img->pixels,
+    };
+
+    uint64_t masks[4] = { fmt->Rmask, fmt->Gmask, fmt->Bmask, fmt->Amask };
+    pl_plane_data_from_mask(&data, masks);
+
+    bool ok = pl_upload_plane(win->gpu, plane, tex, &data);
+    SDL_FreeSurface(fixed);
+    return ok;
+}
+
+static bool render_frame(const struct pl_swapchain_frame *frame)
+{
+    pl_tex img = img_plane.texture;
+    struct pl_frame image = {
+        .num_planes = 1,
+        .planes     = { img_plane },
+        .repr       = pl_color_repr_unknown,
+        .color      = pl_color_space_unknown,
+        .crop       = {0, 0, img->params.w, img->params.h},
+    };
+
+    // This seems to be the case for SDL2_image
+    image.repr.alpha = PL_ALPHA_INDEPENDENT;
+
+    struct pl_frame target;
+    pl_frame_from_swapchain(&target, frame);
+    target.profile = (struct pl_icc_profile) {
+        .data = icc_file.data,
+        .len = icc_file.size,
+    };
+
+    image.rotation = PL_ROTATION_0; // for testing
+    pl_rect2df_aspect_copy_rot(&target.crop, &image.crop, 0.0, image.rotation);
+
+    struct pl_overlay osd;
+    struct pl_overlay_part osd_part;
+    if (osd_tex) {
+        osd_part = (struct pl_overlay_part) {
+            .src = { 0, 0, osd_tex->params.w, osd_tex->params.h },
+            .dst = { 0, 0, osd_tex->params.w, osd_tex->params.h },
+        };
+        osd = (struct pl_overlay) {
+            .tex        = osd_tex,
+            .mode       = PL_OVERLAY_NORMAL,
+            .repr       = image.repr,
+            .color      = image.color,
+            .coords     = PL_OVERLAY_COORDS_DST_FRAME,
+            .parts      = &osd_part,
+            .num_parts  = 1,
+        };
+        target.overlays = &osd;
+        target.num_overlays = 1;
+    }
+
+    // Use the heaviest preset purely for demonstration/testing purposes
+    struct pl_render_params params = pl_render_high_quality_params;
+    params.lut = lut;
+
+    return pl_render_image(renderer, &image, &target, &params);
+}
+
+int main(int argc, char **argv)
+{
+    if (argc < 2 || argc > 3) {
+        fprintf(stderr, "Usage: %s <image> [<overlay>]\n", argv[0]);
+        return 255;
+    }
+
+    const char *file = argv[1];
+    const char *overlay = argc > 2 ? argv[2] : NULL;
+    logger = pl_log_create(PL_API_VER, pl_log_params(
+        .log_cb = pl_log_color,
+        .log_level = PL_LOG_INFO,
+    ));
+
+
+    // Load image, do this first so we can use it for the window size
+    SDL_Surface *img = IMG_Load(file);
+    if (!img) {
+        fprintf(stderr, "Failed loading '%s': %s\n", file, SDL_GetError());
+        uninit(1);
+    }
+
+    // Create window
+    unsigned int start = SDL_GetTicks();
+    win = window_create(logger, &(struct window_params) {
+        .title = "SDL2_image demo",
+        .width = img->w,
+        .height = img->h,
+    });
+    if (!win)
+        uninit(1);
+
+    // Initialize rendering state
+    if (!upload_plane(img, &img_tex, &img_plane)) {
+        fprintf(stderr, "Failed uploading image plane!\n");
+        uninit(2);
+    }
+    SDL_FreeSurface(img);
+
+    if (overlay) {
+        SDL_Surface *osd = IMG_Load(overlay);
+        if (!upload_plane(osd, &osd_tex, &osd_plane))
+            fprintf(stderr, "Failed uploading OSD plane.. continuing anyway\n");
+        SDL_FreeSurface(osd);
+    }
+
+    if (!open_file(icc_profile, &icc_file))
+        fprintf(stderr, "Failed opening ICC profile.. continuing anyway\n");
+
+    struct file lutf;
+    if (open_file(lut_file, &lutf) && lutf.size) {
+        if (!(lut = pl_lut_parse_cube(logger, lutf.data, lutf.size)))
+            fprintf(stderr, "Failed parsing LUT.. continuing anyway\n");
+        close_file(&lutf);
+    }
+
+    renderer = pl_renderer_create(logger, win->gpu);
+
+    unsigned int last = SDL_GetTicks(), frames = 0;
+    printf("Took %u ms for initialization\n", last - start);
+
+    // Render loop
+    while (!win->window_lost) {
+        struct pl_swapchain_frame frame;
+        bool ok = pl_swapchain_start_frame(win->swapchain, &frame);
+        if (!ok) {
+            window_poll(win, true);
+            continue;
+        }
+
+        if (!render_frame(&frame)) {
+            fprintf(stderr, "libplacebo: Failed rendering frame!\n");
+            uninit(3);
+        }
+
+        ok = pl_swapchain_submit_frame(win->swapchain);
+        if (!ok) {
+            fprintf(stderr, "libplacebo: Failed submitting frame!\n");
+            uninit(3);
+        }
+
+        pl_swapchain_swap_buffers(win->swapchain);
+        frames++;
+
+        unsigned int now = SDL_GetTicks();
+        if (now - last > 5000) {
+            printf("%u frames in %u ms = %f FPS\n", frames, now - last,
+                   1000.0f * frames / (now - last));
+            last = now;
+            frames = 0;
+        }
+
+        window_poll(win, false);
+    }
+
+    uninit(0);
+}