From ee22df92112d6309adc8b0ed1b8d5624a68e27e9 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Sat, 6 Feb 2016 11:39:37 +0100
Subject: Add command line options

---
 glslview.c  | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++--------
 glslwrite.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++--------
 2 files changed, 102 insertions(+), 16 deletions(-)

diff --git a/glslview.c b/glslview.c
index 4ff4dd3..b0b5d1b 100644
--- a/glslview.c
+++ b/glslview.c
@@ -46,6 +46,12 @@
 #endif
 
 
+static int init_param0 = 0;
+static int init_param1 = 0;
+static int init_param2 = 0;
+static float init_time = 0;
+static float init_speed = 1.0;
+
 static bool paused = false;
 static float speed = 1.0;
 static unsigned previous_ticks = 0;
@@ -124,11 +130,13 @@ static void handle_input(const char *input) {
 			break;
 
 		case 'r':
-			current_time = 0;
+			current_time = init_time;
 			break;
 
 		case 'R':
-			param0 = param1 = param2 = 0;
+			param0 = init_param0;
+			param1 = init_param1;
+			param2 = init_param2;
 			print_params();
 			break;
 
@@ -142,9 +150,9 @@ static void handle_input(const char *input) {
 
 		case '=':
 			if (speed < 0)
-				set_speed(-1.0);
+				set_speed(-init_speed);
 			else
-				set_speed(1.0);
+				set_speed(init_speed);
 			break;
 
 		case '<':
@@ -163,12 +171,48 @@ static void handle_input(const char *input) {
 	}
 }
 
+static void usage(void) {
+	fprintf(stderr, "Usage: glslview [-t <time>] [-s <speed>] [-0 <param0>] [-1 <param1>] [-2 <param2>] <shader>\n");
+	exit(1);
+}
+
 int main(int argc, char *argv[]) {
-	if (argc != 2) {
-		fprintf(stderr, "Usage: glslview <shader>\n");
-		exit(1);
+	while (true) {
+		int c = getopt(argc, argv, "t:s:0:1:2:");
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 't':
+			current_time = init_time = atof(optarg);
+			break;
+
+		case 's':
+			speed = atof(optarg);
+			init_speed = fabsf(speed);
+			break;
+
+		case '0':
+			param0 = init_param0 = atoi(optarg);
+			break;
+
+		case '1':
+			param1 = init_param1 = atoi(optarg);
+			break;
+
+		case '2':
+			param2 = init_param2 = atoi(optarg);
+			break;
+
+		default:
+			fprintf(stderr, "Invalid option '%c'\n", optopt);
+			usage();
+		}
 	}
 
+	if (argc - optind != 1)
+		usage();
+
 	SDL_Init(SDL_INIT_VIDEO);
 
 	SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
@@ -179,7 +223,7 @@ int main(int argc, char *argv[]) {
 	SDL_Window *window = SDL_CreateWindow("glslview", 0, 0, 800, 800, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
 	SDL_GLContext ctx = SDL_GL_CreateContext(window);
 
-	filename = argv[1];
+	filename = argv[optind];
 
 	init_watch();
 	init();
diff --git a/glslwrite.c b/glslwrite.c
index 2913ae8..6673146 100644
--- a/glslwrite.c
+++ b/glslwrite.c
@@ -27,6 +27,7 @@
 
 #include <stdbool.h>
 #include <stdio.h>
+#include <unistd.h>
 
 #include <png.h>
 
@@ -36,12 +37,17 @@
 #include <SDL2/SDL_opengl.h>
 
 
+static float step = 20;
+static unsigned frame = 0;
+static unsigned max_frame = 0;
+
+
 static void savePNG(int width, int height, const char *output_dir) {
 	uint8_t pixels[width*height*4];
 	glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, pixels);
 
 	char filename[strlen(output_dir) + 20];
-	snprintf(filename, sizeof(filename), "%s/%010u.png", output_dir, (unsigned)current_time);
+	snprintf(filename, sizeof(filename), "%s/%010u.png", output_dir, frame);
 
 	FILE *f = fopen(filename, "wb");
 	if (!f) {
@@ -84,12 +90,47 @@ static void savePNG(int width, int height, const char *output_dir) {
 	fclose(f);
 }
 
+static void usage(void) {
+	fprintf(stderr, "Usage: glslwrite [-s <step>] [-f <frames>] [-0 <param0>] [-1 <param1>] [-2 <param2>] <shader>\n");
+	exit(1);
+}
+
 int main(int argc, char *argv[]) {
-	if (argc != 3) {
-		fprintf(stderr, "Usage: glslwrite <shader> <output directory>\n");
-		exit(1);
+	while (true) {
+		int c = getopt(argc, argv, "s:f:0:1:2:");
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 's':
+			step = atof(optarg);
+			break;
+
+		case 'f':
+			max_frame = atoi(optarg);
+			break;
+
+		case '0':
+			param0 = atoi(optarg);
+			break;
+
+		case '1':
+			param1 = atoi(optarg);
+			break;
+
+		case '2':
+			param2 = atoi(optarg);
+			break;
+
+		default:
+			fprintf(stderr, "Invalid option '%c'\n", optopt);
+			usage();
+		}
 	}
 
+	if (argc - optind != 2)
+		usage();
+
 	SDL_Init(SDL_INIT_VIDEO);
 
 	SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
@@ -100,11 +141,11 @@ int main(int argc, char *argv[]) {
 	SDL_Window *window = SDL_CreateWindow("glslwrite", 0, 0, 800, 800, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
 	SDL_GLContext ctx = SDL_GL_CreateContext(window);
 
-	filename = argv[1];
+	filename = argv[optind];
 	init();
 	load();
 
-	while (true) {
+	while (!max_frame || frame < max_frame) {
 		SDL_Event e;
 
 		while (SDL_PollEvent(&e)) {
@@ -128,8 +169,9 @@ int main(int argc, char *argv[]) {
 		render(width, height);
 		SDL_GL_SwapWindow(window);
 
-		savePNG(width, height, argv[2]);
-		current_time += 20;
+		savePNG(width, height, argv[optind+1]);
+		current_time += step;
+		frame++;
 	}
 
  quit:
-- 
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