add shadertoy mode

Doesn't handle shadertoy shaders which use textures for inputs.  That
probably wouldn't be straightforward without using the web API to fetch
and introspect the shader.  But that sounds like a lot more work.

1 files changed, 10 insertions, 2 deletions

diff --git a/kmscube.c b/kmscube.c
index 7c344ab..b2d959f 100644
--- a/kmscube.c
+++ b/kmscube.c
@@ -41,7 +41,7 @@ static const struct egl *egl;
 static const struct gbm *gbm;
 static const struct drm *drm;
 
-static const char *shortopts = "AD:f:M:m:s:V:v:";
+static const char *shortopts = "AD:f:M:m:S:s:V:v:";
 
 static const struct option longopts[] = {
 	{"atomic", no_argument,       0, 'A'},
@@ -57,7 +57,7 @@ static const struct option longopts[] = {
 
 static void usage(const char *name)
 {
-	printf("Usage: %s [-ADfMmsVv]\n"
+	printf("Usage: %s [-ADfMmSsVv]\n"
 			"\n"
 			"options:\n"
 			"    -A, --atomic             use atomic modesetting and fencing\n"
@@ -69,6 +69,7 @@ static void usage(const char *name)
 			"        nv12-2img -  yuv textured (color conversion in shader)\n"
 			"        nv12-1img -  yuv textured (single nv12 texture)\n"
 			"    -m, --modifier=MODIFIER  hardcode the selected modifier\n"
+			"    -S, --shadertoy=FILE     use specified shadertoy shader\n"
 			"    -s, --samples=N          use MSAA\n"
 			"    -V, --video=FILE         video textured cube\n"
 			"    -v, --vmode=VMODE        specify the video mode in the format\n"
@@ -80,6 +81,7 @@ int main(int argc, char *argv[])
 {
 	const char *device = NULL;
 	const char *video = NULL;
+	const char *shadertoy = NULL;
 	char mode_str[DRM_DISPLAY_MODE_LEN] = "";
 	char *p;
 	enum mode mode = SMOOTH;
@@ -137,6 +139,10 @@ int main(int argc, char *argv[])
 		case 'm':
 			modifier = strtoull(optarg, NULL, 0);
 			break;
+		case 'S':
+			mode = SHADERTOY;
+			shadertoy = optarg;
+			break;
 		case 's':
 			samples = strtoul(optarg, NULL, 0);
 			break;
@@ -183,6 +189,8 @@ int main(int argc, char *argv[])
 		egl = init_cube_smooth(gbm, samples);
 	else if (mode == VIDEO)
 		egl = init_cube_video(gbm, video, samples);
+	else if (mode == SHADERTOY)
+		egl = init_cube_shadertoy(gbm, shadertoy, samples);
 	else
 		egl = init_cube_tex(gbm, mode, samples);