1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/.hgignore	Tue Jun 19 05:30:45 2012 +0300
     1.3 @@ -0,0 +1,3 @@
     1.4 +\.swp$
     1.5 +\.o$
     1.6 +^gradtool$

     2.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     2.2 +++ b/Makefile	Tue Jun 19 05:30:45 2012 +0300
     2.3 @@ -0,0 +1,21 @@
     2.4 +PREFIX = /usr/local
     2.5 +obj = gradtool.o
     2.6 +bin = gradtool
     2.7 +
     2.8 +CFLAGS = -std=c89 -pedantic -Wall -g
     2.9 +LDFLAGS = -lglut -lGL
    2.10 +
    2.11 +$(bin): $(obj)
    2.12 +	$(CC) -o $@ $(obj) $(LDFLAGS)
    2.13 +
    2.14 +.PHONY: clean
    2.15 +clean:
    2.16 +	rm -f $(obj) $(bin)
    2.17 +
    2.18 +.PHONY: install
    2.19 +install: $(bin)
    2.20 +	cp $(bin) $(PREFIX)/bin/$(bin)
    2.21 +
    2.22 +.PHONY: uninstall
    2.23 +uninstall:
    2.24 +	rm -f $(PREFIX)/bin/$(bin)

     3.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     3.2 +++ b/gradtool.c	Tue Jun 19 05:30:45 2012 +0300
     3.3 @@ -0,0 +1,419 @@
     3.4 +#include <stdio.h>
     3.5 +#include <stdlib.h>
     3.6 +#include <GL/glut.h>
     3.7 +
     3.8 +#define MAX_POS		512
     3.9 +
    3.10 +typedef struct key {
    3.11 +	int pos;
    3.12 +	float val;
    3.13 +	struct key *next;
    3.14 +} key_t;
    3.15 +
    3.16 +struct track {
    3.17 +	key_t *keys;
    3.18 +	int count;
    3.19 +};
    3.20 +
    3.21 +void redraw(void);
    3.22 +void draw_curves(void);
    3.23 +void draw_grad(void);
    3.24 +
    3.25 +void set_val(struct track *track, float pos, float val);
    3.26 +void rm_val(struct track *track, float pos);
    3.27 +float get_val(struct track *track, float pos);
    3.28 +
    3.29 +void save(void);
    3.30 +
    3.31 +void key_handler(unsigned char key, int x, int y);
    3.32 +void skey_handler(int key, int x, int y);
    3.33 +void mbutton_handler(int bn, int state, int x, int y);
    3.34 +void drag_handler(int x, int y);
    3.35 +void reshape_handler(int x, int y);
    3.36 +
    3.37 +int view_xsz = 640;
    3.38 +int view_ysz = 480;
    3.39 +
    3.40 +struct track tred, tgreen, tblue;
    3.41 +
    3.42 +int main(int argc, char **argv)
    3.43 +{
    3.44 +	glutInit(&argc, argv);
    3.45 +	glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
    3.46 +	glutInitWindowSize(view_xsz, view_ysz);
    3.47 +	glutCreateWindow("Mindlapse gradiant editor");
    3.48 +
    3.49 +	glutDisplayFunc(redraw);
    3.50 +	glutKeyboardFunc(key_handler);
    3.51 +	glutSpecialFunc(skey_handler);
    3.52 +	glutMouseFunc(mbutton_handler);
    3.53 +	glutMotionFunc(drag_handler);
    3.54 +	glutReshapeFunc(reshape_handler);
    3.55 +
    3.56 +	glClearColor(0, 0, 0, 0);
    3.57 +	glEnable(GL_POINT_SMOOTH);
    3.58 +
    3.59 +	glMatrixMode(GL_PROJECTION);
    3.60 +	glOrtho(0, 1, 0, 1, -1, 1);
    3.61 +	glMatrixMode(GL_MODELVIEW);
    3.62 +
    3.63 +	tred.keys = malloc(sizeof *tred.keys);
    3.64 +	tred.keys->next = 0;
    3.65 +
    3.66 +	tgreen.keys = malloc(sizeof *tgreen.keys);
    3.67 +	tgreen.keys->next = 0;
    3.68 +
    3.69 +	tblue.keys = malloc(sizeof *tblue.keys);
    3.70 +	tblue.keys->next = 0;
    3.71 +
    3.72 +	glutMainLoop();
    3.73 +	return 0;
    3.74 +}
    3.75 +
    3.76 +void redraw(void)
    3.77 +{
    3.78 +	glClear(GL_COLOR_BUFFER_BIT);
    3.79 +
    3.80 +	draw_curves();
    3.81 +
    3.82 +	draw_grad();
    3.83 +
    3.84 +	glutSwapBuffers();
    3.85 +}
    3.86 +
    3.87 +void draw_curves(void)
    3.88 +{
    3.89 +	int i;
    3.90 +	key_t *ptr;
    3.91 +
    3.92 +	glLoadIdentity();
    3.93 +	glTranslatef(0, 0.25, 0);
    3.94 +	glScalef(1, 0.75, 1);
    3.95 +
    3.96 +	glBegin(GL_LINES);
    3.97 +	/* draw grid */
    3.98 +	glColor3f(0.5, 0.5, 0.5);
    3.99 +	glVertex2f(0, 0); glVertex2f(0, 1);
   3.100 +	glVertex2f(1, 0); glVertex2f(1, 1);
   3.101 +	glVertex2f(0, 0); glVertex2f(1, 0);
   3.102 +	glVertex2f(0, 1); glVertex2f(1, 1);
   3.103 +
   3.104 +	glVertex2f(0, 0.25); glVertex2f(1, 0.25);
   3.105 +	glVertex2f(0, 0.5); glVertex2f(1, 0.5);
   3.106 +	glVertex2f(0, 0.75); glVertex2f(1, 0.75);
   3.107 +
   3.108 +	glVertex2f(0.25, 0); glVertex2f(0.25, 1);
   3.109 +	glVertex2f(0.5, 0); glVertex2f(0.5, 1);
   3.110 +	glVertex2f(0.75, 0); glVertex2f(0.75, 1);
   3.111 +	glEnd();
   3.112 +
   3.113 +	glEnable(GL_BLEND);
   3.114 +	glBlendFunc(GL_ONE, GL_ONE);
   3.115 +
   3.116 +	glBegin(GL_LINES);
   3.117 +	for(i=0; i<3; i++) {
   3.118 +		glColor3f(i == 0, i == 1, i == 2);
   3.119 +		ptr = (i == 0 ? tred.keys->next : (i == 1 ? tgreen.keys->next : tblue.keys->next));
   3.120 +
   3.121 +		if(ptr && ptr->pos > 0) {
   3.122 +			glVertex2f(0, ptr->val);
   3.123 +			glVertex2f(ptr->pos / (float)MAX_POS, ptr->val);
   3.124 +		}
   3.125 +
   3.126 +		while(ptr && ptr->next) {
   3.127 +			glVertex2f(ptr->pos / (float)MAX_POS, ptr->val);
   3.128 +			glVertex2f(ptr->next->pos / (float)MAX_POS, ptr->next->val);
   3.129 +			ptr = ptr->next;
   3.130 +		}
   3.131 +
   3.132 +		if(ptr && ptr->pos != MAX_POS) {
   3.133 +			glVertex2f(ptr->pos / (float)MAX_POS, ptr->val);
   3.134 +			glVertex2f(1, ptr->val);
   3.135 +		}
   3.136 +	}
   3.137 +	glEnd();
   3.138 +
   3.139 +	glPointSize(5);
   3.140 +	glBegin(GL_POINTS);
   3.141 +	for(i=0; i<3; i++) {
   3.142 +		glColor3f(i == 0, i == 1, i == 2);
   3.143 +		ptr = (i == 0 ? tred.keys->next : (i == 1 ? tgreen.keys->next : tblue.keys->next));
   3.144 +
   3.145 +		while(ptr) {
   3.146 +			glVertex2f(ptr->pos / (float)MAX_POS, ptr->val);
   3.147 +			ptr = ptr->next;
   3.148 +		}
   3.149 +	}
   3.150 +	glEnd();
   3.151 +
   3.152 +	glDisable(GL_BLEND);
   3.153 +}
   3.154 +
   3.155 +#define GRAD_SAMPLES	MAX_POS
   3.156 +void draw_grad(void)
   3.157 +{
   3.158 +	int i;
   3.159 +
   3.160 +	glLoadIdentity();
   3.161 +	glScalef(1, 0.25, 1);
   3.162 +
   3.163 +	glBegin(GL_QUADS);
   3.164 +	for(i=0; i<GRAD_SAMPLES-1; i++) {
   3.165 +		float t = (float)i / (float)GRAD_SAMPLES;
   3.166 +		glColor3f(get_val(&tred, t), get_val(&tgreen, t), get_val(&tblue, t));
   3.167 +		glVertex2f(t, 0);
   3.168 +		glVertex2f(t, 1);
   3.169 +
   3.170 +		t = (float)(i + 1) / (float)GRAD_SAMPLES;
   3.171 +		glColor3f(get_val(&tred, t), get_val(&tgreen, t), get_val(&tblue, t));
   3.172 +		glVertex2f(t, 1);
   3.173 +		glVertex2f(t, 0);
   3.174 +	}
   3.175 +	glEnd();
   3.176 +}
   3.177 +
   3.178 +void set_val(struct track *tr, float pos, float val)
   3.179 +{
   3.180 +	key_t *nkey;
   3.181 +	key_t *ptr = tr->keys;
   3.182 +	int ipos = (int)(pos * MAX_POS);
   3.183 +
   3.184 +	if(!ptr->next || ptr->next->pos > ipos) {
   3.185 +		nkey = malloc(sizeof *nkey);
   3.186 +		nkey->pos = ipos;
   3.187 +		nkey->val = val;
   3.188 +		nkey->next = ptr->next;
   3.189 +		ptr->next = nkey;
   3.190 +		return;
   3.191 +	}
   3.192 +
   3.193 +	while(ptr->next && ptr->next->pos < ipos) {
   3.194 +		ptr = ptr->next;
   3.195 +	}
   3.196 +
   3.197 +	if(ptr->pos == ipos) {
   3.198 +		ptr->val = val;
   3.199 +	} else {
   3.200 +		nkey = malloc(sizeof *nkey);
   3.201 +		nkey->pos = ipos;
   3.202 +		nkey->val = val;
   3.203 +		nkey->next = ptr->next;
   3.204 +		ptr->next = nkey;
   3.205 +	}
   3.206 +}
   3.207 +
   3.208 +void rm_val(struct track *tr, float pos)
   3.209 +{
   3.210 +	key_t *ptr = tr->keys;
   3.211 +	int ipos = (int)(pos * MAX_POS);
   3.212 +
   3.213 +	while(ptr->next && ptr->next->pos <= ipos) {
   3.214 +		if(ptr->next->pos == ipos) {
   3.215 +			key_t *tmp = ptr->next;
   3.216 +			ptr->next = ptr->next->next;
   3.217 +			free(tmp);
   3.218 +			return;
   3.219 +		}
   3.220 +		ptr = ptr->next;
   3.221 +	}
   3.222 +}
   3.223 +
   3.224 +float get_val(struct track *tr, float pos)
   3.225 +{
   3.226 +	float t;
   3.227 +	key_t *ptr = tr->keys->next;
   3.228 +	int ipos = (int)(pos * MAX_POS);
   3.229 +
   3.230 +	if(!ptr) {
   3.231 +		return 0.0;
   3.232 +	}
   3.233 +
   3.234 +	while(ptr && ptr->pos <= ipos) {
   3.235 +		if(ptr->pos == ipos || !ptr->next) {
   3.236 +			return ptr->val;
   3.237 +		}
   3.238 +
   3.239 +		if(ptr->next->pos > ipos) {
   3.240 +			t = (float)(ipos - ptr->pos) / (float)(ptr->next->pos - ptr->pos);
   3.241 +			return ptr->val + (ptr->next->val - ptr->val) * t;
   3.242 +		}
   3.243 +
   3.244 +		ptr = ptr->next;
   3.245 +	}
   3.246 +
   3.247 +	return tr->keys->next->val;
   3.248 +}
   3.249 +
   3.250 +void clear_track(struct track *tr)
   3.251 +{
   3.252 +	key_t *ptr = tr->keys->next;
   3.253 +	while(ptr) {
   3.254 +		key_t *tmp = ptr;
   3.255 +		ptr = ptr->next;
   3.256 +		free(tmp);
   3.257 +	}
   3.258 +	tr->keys->next = 0;
   3.259 +}
   3.260 +
   3.261 +
   3.262 +#define IMG_X	256
   3.263 +#define FNAME	"grad.ppm"
   3.264 +void save(void)
   3.265 +{
   3.266 +	int i;
   3.267 +	FILE *fp;
   3.268 +
   3.269 +	if(!(fp = fopen(FNAME, "wb"))) {
   3.270 +		perror("failed to write " FNAME);
   3.271 +		return;
   3.272 +	}
   3.273 +
   3.274 +	fprintf(fp, "P6\n%d %d\n255\n", IMG_X, 1);
   3.275 +
   3.276 +	for(i=0; i<IMG_X; i++) {
   3.277 +		float t = (float)i / (float)IMG_X;
   3.278 +		int r = get_val(&tred, t) * 255.0;
   3.279 +		int g = get_val(&tgreen, t) * 255.0;
   3.280 +		int b = get_val(&tblue, t) * 255.0;
   3.281 +
   3.282 +		fputc(r, fp);
   3.283 +		fputc(g, fp);
   3.284 +		fputc(b, fp);
   3.285 +	}
   3.286 +
   3.287 +	fclose(fp);
   3.288 +}
   3.289 +
   3.290 +
   3.291 +void key_handler(unsigned char key, int x, int y)
   3.292 +{
   3.293 +	skey_handler(key, x, y);
   3.294 +}
   3.295 +
   3.296 +void skey_handler(int key, int x, int y)
   3.297 +{
   3.298 +	switch(key) {
   3.299 +	case 27:
   3.300 +		exit(0);
   3.301 +
   3.302 +	case 's':
   3.303 +	case 'S':
   3.304 +		save();
   3.305 +		break;
   3.306 +
   3.307 +	case 'c':
   3.308 +		clear_track(&tred);
   3.309 +		clear_track(&tgreen);
   3.310 +		clear_track(&tblue);
   3.311 +		glutPostRedisplay();
   3.312 +		break;
   3.313 +
   3.314 +	default:
   3.315 +		break;
   3.316 +	}
   3.317 +}
   3.318 +
   3.319 +static int px, py;
   3.320 +static float ppos, pval;
   3.321 +static struct track *tr;
   3.322 +
   3.323 +void mbutton_handler(int bn, int state, int x, int y)
   3.324 +{
   3.325 +	float pos, val;
   3.326 +
   3.327 +	pos = (float)x / (float)view_xsz;
   3.328 +	val = 1.0 - (float)y / (float)(view_ysz - view_ysz / 4.0);
   3.329 +
   3.330 +	if(bn == GLUT_LEFT_BUTTON) {
   3.331 +		tr = &tred;
   3.332 +	} else if(bn == GLUT_MIDDLE_BUTTON) {
   3.333 +		tr = &tgreen;
   3.334 +	} else if(bn == GLUT_RIGHT_BUTTON) {
   3.335 +		tr = &tblue;
   3.336 +	} else {
   3.337 +		return;
   3.338 +	}
   3.339 +
   3.340 +	if(glutGetModifiers() & GLUT_ACTIVE_CTRL) {
   3.341 +		tr = 0;
   3.342 +	}
   3.343 +
   3.344 +	if(state == 0) {
   3.345 +		px = x;
   3.346 +		py = y;
   3.347 +		ppos = pos;
   3.348 +		pval = val;
   3.349 +	} else {
   3.350 +		if(px == -1 || abs(x - px) > 2 || abs(y - py) > 2) {
   3.351 +			return;
   3.352 +		}
   3.353 +		if(val < 0.0 || val > 1.0) return;
   3.354 +
   3.355 +
   3.356 +		if(glutGetModifiers() & GLUT_ACTIVE_SHIFT) {
   3.357 +			if(tr) {
   3.358 +				rm_val(tr, pos);
   3.359 +			} else {
   3.360 +				rm_val(&tred, pos);
   3.361 +				rm_val(&tgreen, pos);
   3.362 +				rm_val(&tblue, pos);
   3.363 +			}
   3.364 +		} else {
   3.365 +			if(tr) {
   3.366 +				set_val(tr, pos, val);
   3.367 +			} else {
   3.368 +				set_val(&tred, pos, val);
   3.369 +				set_val(&tgreen, pos, val);
   3.370 +				set_val(&tblue, pos, val);
   3.371 +			}
   3.372 +		}
   3.373 +
   3.374 +		px = -1;
   3.375 +		py = -1;
   3.376 +		glutPostRedisplay();
   3.377 +	}
   3.378 +}
   3.379 +
   3.380 +void drag_handler(int x, int y)
   3.381 +{
   3.382 +	float pos = (float)x / (float)view_xsz;
   3.383 +	float val = 1.0 - (float)y / (float)(view_ysz - view_ysz / 4.0);
   3.384 +
   3.385 +	if(pos < 0.0) pos = 0.0;
   3.386 +	if(pos > 1.0) pos = 1.0;
   3.387 +	if(val < 0.0) val = 0.0;
   3.388 +	if(val > 1.0) val = 1.0;
   3.389 +
   3.390 +	if(tr) {
   3.391 +		rm_val(tr, ppos);
   3.392 +		rm_val(tr, ppos - 1.0 / (float)view_xsz);
   3.393 +		rm_val(tr, ppos + 1.0 / (float)view_xsz);
   3.394 +		set_val(tr, pos, val);
   3.395 +	} else {
   3.396 +		rm_val(&tred, ppos);
   3.397 +		rm_val(&tgreen, ppos);
   3.398 +		rm_val(&tblue, ppos);
   3.399 +		rm_val(&tred, ppos - 1.0 / (float)view_xsz);
   3.400 +		rm_val(&tgreen, ppos - 1.0 / (float)view_xsz);
   3.401 +		rm_val(&tblue, ppos - 1.0 / (float)view_xsz);
   3.402 +		rm_val(&tred, ppos + 1.0 / (float)view_xsz);
   3.403 +		rm_val(&tgreen, ppos + 1.0 / (float)view_xsz);
   3.404 +		rm_val(&tblue, ppos + 1.0 / (float)view_xsz);
   3.405 +		set_val(&tred, pos, val);
   3.406 +		set_val(&tgreen, pos, val);
   3.407 +		set_val(&tblue, pos, val);
   3.408 +	}
   3.409 +
   3.410 +	ppos = pos;
   3.411 +	pval = val;
   3.412 +
   3.413 +	glutPostRedisplay();
   3.414 +}
   3.415 +
   3.416 +void reshape_handler(int x, int y)
   3.417 +{
   3.418 +	view_xsz = x;
   3.419 +	view_ysz = y;
   3.420 +
   3.421 +	glViewport(0, 0, x, y);
   3.422 +}