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-rw-r--r--surfaces/main.c89
1 files changed, 79 insertions, 10 deletions
diff --git a/surfaces/main.c b/surfaces/main.c
index d00bca6..0d02cce 100644
--- a/surfaces/main.c
+++ b/surfaces/main.c
@@ -23,6 +23,11 @@
* pixels --symbols FONT.vsym [--size PX] --grid WxH --out PREFIX
* the TUI's frames drawn with a font's glyphs, driven by a
* script: each show writes PREFIX-N.ppm after the text
+ * display --symbols FONT.vsym [--size PX] [--card PATH] [--writeback WxH --out PREFIX]
+ * the same on a display through KMS, as many cells as fit,
+ * driven by a script; with writeback each shown frame comes
+ * back from the display controller, is set against what was
+ * drawn and written to PREFIX-N.ppm
* With --store the app's states live in that tree store: the app continues
* where it was, whichever surface runs it. With --watch (tui, web) a module
* written again replaces the running one and states keep their values by
@@ -459,7 +464,7 @@ static int interactive(void) {
/* ---- scripts -------------------------------------------------------- */
-typedef enum { SURFACE_CLI, SURFACE_SAY, SURFACE_TUI, SURFACE_WEB, SURFACE_PIXELS } Surface;
+typedef enum { SURFACE_CLI, SURFACE_SAY, SURFACE_TUI, SURFACE_WEB, SURFACE_PIXELS, SURFACE_DISPLAY } Surface;
/* The pixel surface's font and where its frames go. */
static VegaFace face;
@@ -490,11 +495,48 @@ static bool write_frame(const VegaGrid *grid, char path[512]) {
return ok;
}
+static VegaDisplay *display;
+
+/* A frame on the display; with writeback, what came back is set against it
+ * and written (differing: how many pixels are not what was drawn). */
+static bool show_frame(const VegaGrid *grid, char path[512], unsigned long *differing) {
+ unsigned width, height;
+ size_t stride, captured_stride;
+ uint32_t *out = vega_display_buffer(display, &width, &height, &stride);
+ vega_pixels_clear(out, stride, width, height);
+ vega_pixels(grid, &face, out, stride);
+ if (!vega_display_show(display)) return false;
+ const uint32_t *back = vega_display_captured(display, &captured_stride);
+ *differing = 0;
+ path[0] = 0;
+ if (!back || !frames_prefix) return true;
+ /* The capture read once, a row at a time (it is not cached memory either). */
+ uint32_t *row = malloc((size_t)width * sizeof(*row));
+ unsigned char *rgb = malloc((size_t)width * height * 3);
+ bool ok = row && rgb;
+ for (unsigned y = 0; ok && y < height; ++y) {
+ memcpy(row, back + (size_t)y * captured_stride, (size_t)width * sizeof(*row));
+ for (unsigned x = 0; x < width; ++x) {
+ *differing += (row[x] & 0xffffff) != (out[(size_t)y * stride + x] & 0xffffff);
+ unsigned char *p = rgb + ((size_t)y * width + x) * 3;
+ p[0] = (unsigned char)(row[x] >> 16), p[1] = (unsigned char)(row[x] >> 8), p[2] = (unsigned char)row[x];
+ }
+ }
+ snprintf(path, 512, "%s-%u.ppm", frames_prefix, ++frames);
+ FILE *f = ok ? fopen(path, "wb") : NULL;
+ ok = f && fprintf(f, "P6\n%u %u\n255\n", width, height) > 0 && fwrite(rgb, 3, (size_t)width * height, f) == (size_t)width * height;
+ if (f && fclose(f)) ok = false;
+ free(row);
+ free(rgb);
+ return ok;
+}
+
+
/* painting: show writes the terminal bytes of the frame, not the grid. */
static int script(Surface surface, unsigned width, unsigned height, bool painting) {
static char line[1 << 16];
VegaGrid grid = {0};
- bool gridded = surface == SURFACE_TUI || surface == SURFACE_PIXELS;
+ bool gridded = surface == SURFACE_TUI || surface == SURFACE_PIXELS || surface == SURFACE_DISPLAY;
if (gridded && !vega_grid(&grid, width, height)) return 2;
bool shown = false;
drawn = gridded ? &grid : NULL;
@@ -572,9 +614,13 @@ static int script(Surface surface, unsigned width, unsigned height, bool paintin
dump(&grid);
printf("cells %lu\n", vega_evaluations() - counted);
char path[512];
+ unsigned long differing;
if (surface == SURFACE_PIXELS) {
if (!write_frame(&grid, path)) { fprintf(stderr, "vega: cannot write %s\n", path); return 1; }
printf("frame %s %dx%d\n", path, (int)grid.width * face.cell_width, (int)grid.height * face.cell_height);
+ } else if (surface == SURFACE_DISPLAY) {
+ if (!show_frame(&grid, path, &differing)) { fputs("vega: the display did not take the frame\n", stderr); return 1; }
+ if (path[0]) printf("frame %s differing %lu grid %ux%u\n", path, differing, grid.width, grid.height);
}
}
counted = vega_evaluations();
@@ -594,6 +640,9 @@ static int script(Surface surface, unsigned width, unsigned height, bool paintin
return 0;
}
+/* Surfaces that draw glyphs. */
+static bool glyphed(const char *surface) { return !strcmp(surface, "pixels") || !strcmp(surface, "display"); }
+
/* The symbols a pixel surface draws with, read whole and kept. */
static bool open_face(const char *path, float size) {
static VegaSymbols symbols;
@@ -614,8 +663,9 @@ static bool open_face(const char *path, float size) {
int main(int argc, char **argv) {
unsigned width = 0, height = 0, port = 8080;
- const char *symbols_path = NULL;
+ const char *symbols_path = NULL, *card = "/dev/dri/card1";
float size = 16;
+ bool writeback = false;
bool dumped = false, painting = false, watch = false, usage = argc < 3;
const char *store = NULL, *listen_on = "127.0.0.1";
for (int i = 3; !usage && i < argc; i += 2) {
@@ -633,29 +683,47 @@ int main(int argc, char **argv) {
(!strcmp(argv[i], "--grid") && !strcmp(argv[1], "pixels"))) &&
sscanf(argv[i + 1], "%ux%u", &width, &height) == 2 && width && height && width <= 1000 && height <= 1000)
dumped = true, painting = !strcmp(argv[i], "--paint");
- else if (!strcmp(argv[i], "--symbols") && !strcmp(argv[1], "pixels")) symbols_path = argv[i + 1];
- else if (!strcmp(argv[i], "--out") && !strcmp(argv[1], "pixels")) frames_prefix = argv[i + 1];
- else if (!strcmp(argv[i], "--size") && !strcmp(argv[1], "pixels") && sscanf(argv[i + 1], "%f", &size) == 1) {}
+ else if (!strcmp(argv[i], "--writeback") && !strcmp(argv[1], "display") &&
+ sscanf(argv[i + 1], "%ux%u", &width, &height) == 2 && width && height)
+ writeback = true;
+ else if (!strcmp(argv[i], "--card") && !strcmp(argv[1], "display")) card = argv[i + 1];
+ else if (!strcmp(argv[i], "--symbols") && glyphed(argv[1])) symbols_path = argv[i + 1];
+ else if (!strcmp(argv[i], "--out") && glyphed(argv[1])) frames_prefix = argv[i + 1];
+ else if (!strcmp(argv[i], "--size") && glyphed(argv[1]) && sscanf(argv[i + 1], "%f", &size) == 1) {}
else usage = true;
}
- bool pixels = argc > 1 && !strcmp(argv[1], "pixels");
+ bool pixels = argc > 1 && !strcmp(argv[1], "pixels"), on_display = argc > 1 && !strcmp(argv[1], "display");
if (usage || (dumped && strcmp(argv[1], "tui") && !pixels) || (!strcmp(argv[1], "check") && argc != 3) ||
- (pixels && (!dumped || !symbols_path || !frames_prefix))) {
+ (pixels && (!dumped || !symbols_path || !frames_prefix)) || (on_display && (!symbols_path || (writeback && !frames_prefix)))) {
fputs("vega tui|cli|say MODULE.pmod [--store PATH]\n"
"vega tui MODULE.pmod [--store PATH] [--watch] | --dump|--paint WIDTHxHEIGHT < script\n"
"vega web MODULE.pmod [--store PATH] [--listen ADDRESS] [--port N] [--watch]\n"
"vega pixels MODULE.pmod [--store PATH] --symbols FONT.vsym [--size PX] --grid WIDTHxHEIGHT --out PREFIX < script\n"
+ "vega display MODULE.pmod [--store PATH] --symbols FONT.vsym [--size PX] [--card PATH]\n"
+ " [--writeback WIDTHxHEIGHT --out PREFIX] < script\n"
"vega check MODULE.pmod\n", stderr);
return 2;
}
- if (pixels && !open_face(symbols_path, size)) return 2;
+ if ((pixels || on_display) && !open_face(symbols_path, size)) return 2;
+ if (on_display) {
+ char error[256];
+ if (!(display = vega_display_open(card, writeback, writeback ? width : 0, writeback ? height : 0, error, sizeof(error)))) {
+ fprintf(stderr, "vega: %s\n", error);
+ return 2;
+ }
+ unsigned pixels_across, pixels_down;
+ size_t stride;
+ vega_display_buffer(display, &pixels_across, &pixels_down, &stride);
+ width = pixels_across / (unsigned)face.cell_width;
+ height = pixels_down / (unsigned)face.cell_height;
+ }
if (!strcmp(argv[1], "check")) {
if (!load_module(argv[2], &modules[0])) return 2;
return vega_check(&modules[0], print_finding, argv[2]) ? 1 : 0;
}
Surface surface = !strcmp(argv[1], "cli") ? SURFACE_CLI : !strcmp(argv[1], "say") ? SURFACE_SAY :
!strcmp(argv[1], "tui") ? SURFACE_TUI : !strcmp(argv[1], "web") ? SURFACE_WEB :
- pixels ? SURFACE_PIXELS : (Surface)-1;
+ pixels ? SURFACE_PIXELS : on_display ? SURFACE_DISPLAY : (Surface)-1;
if ((int)surface < 0) { fprintf(stderr, "vega: unknown surface %s\n", argv[1]); return 2; }
if (!load(argv[2], store)) return 2;
if (watch && !dumped) {
@@ -667,5 +735,6 @@ int main(int argc, char **argv) {
/* Frame changes are stored with events; keep the last ones too. */
if (pure_app_save(&app) != PURE_OK) { fputs("vega: cannot save\n", stderr); status = status ? status : 1; }
pure_app_stop(&app);
+ vega_display_close(display);
return status;
}
generated by cgit v1.2.3 (git 2.46.0) at 2026-10-20 13:47:36 +0000