OpenGL-based laser simulator
parent
1cb1185757
commit
84981e74be
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@ -1,6 +1,6 @@
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# OpenLase - a realtime laser graphics toolkit
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#
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# Copyright (C) 2009-2010 Hector Martin "marcan" <hector@marcansoft.com>
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# Copyright (C) 2009-2011 Hector Martin "marcan" <hector@marcansoft.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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@ -24,3 +24,14 @@ target_link_libraries(playilda ${JACK_LIBRARIES})
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add_executable(playvid playvid.c trace.c)
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target_link_libraries(playvid openlase avformat avcodec)
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include_directories (${CMAKE_SOURCE_DIR}/include)
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link_directories (${CMAKE_BINARY_DIR}/libol)
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find_package(OpenGL REQUIRED)
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find_package(GLUT REQUIRED)
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add_executable(simulator simulator.c)
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include_directories(${OPENGL_INCLUDE_DIRS} ${GLUT_INCLUDE_DIRS})
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target_link_libraries(simulator ${OPENGL_LIBRARIES} ${GLUT_LIBRARY} ${JACK_LIBRARIES})
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@ -0,0 +1,267 @@
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/*
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OpenLase - a realtime laser graphics toolkit
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Copyright (C) 2009-2011 Hector Martin "marcan" <hector@marcansoft.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 or version 3.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <jack/jack.h>
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#include <GL/glut.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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int window;
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jack_client_t *client;
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typedef jack_default_audio_sample_t sample_t;
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typedef jack_nframes_t nframes_t;
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jack_port_t *in_x;
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jack_port_t *in_y;
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jack_port_t *in_g;
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nframes_t rate;
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#define HIST_SAMPLES (48 * 50)
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#define BUF_SAMPLES (HIST_SAMPLES+48000)
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typedef struct {
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float x, y, g;
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} bufsample_t;
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bufsample_t buffer[BUF_SAMPLES];
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int buf_widx = 0;
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static int process (nframes_t nframes, void *arg)
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{
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sample_t *i_x = (sample_t *) jack_port_get_buffer (in_x, nframes);
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sample_t *i_y = (sample_t *) jack_port_get_buffer (in_y, nframes);
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sample_t *i_g = (sample_t *) jack_port_get_buffer (in_g, nframes);
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nframes_t frm;
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for (frm = 0; frm < nframes; frm++) {
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buffer[buf_widx].x = *i_x++;
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buffer[buf_widx].y = *i_y++;
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buffer[buf_widx].g = *i_g++;
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buf_widx++;
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if (buf_widx >= BUF_SAMPLES)
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buf_widx = 0;
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}
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return 0;
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}
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static int bufsize (nframes_t nframes, void *arg)
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{
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printf ("the maximum buffer size is now %u\n", nframes);
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return 0;
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}
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static int srate (nframes_t nframes, void *arg)
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{
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rate = nframes;
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if(rate % 1000) {
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printf("error: the sample rate should be a multiple of 1000\n");
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exit(1);
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}
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printf ("Sample rate: %u/sec\n", nframes);
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return 0;
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}
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static void jack_shutdown (void *arg)
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{
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exit (1);
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}
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static inline void laser_color(float g, float ascale)
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{
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float r, b;
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r = b = 0;
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if (g < 0)
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g = 0;
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if (g > 2.0)
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g = 2.0;
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if (g > 1.0) {
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r = b = g - 1.0;
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g = 1.0;
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}
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glColor4f(r, 1, b, g*ascale);
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}
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void draw_gl(void)
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{
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int i, ridx;
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static int fno=0;
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fno++;
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glLoadIdentity();
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glLineWidth(2);
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glPointSize(2);
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// horrid workaround for recordmydesktop/libtheora brokenness
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#if 0
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glBegin(GL_POINTS);
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glColor4f((fno&1) * (64/256.0), (fno&2) * (32/256.0), (fno&4) * (16/256.0), 1);
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//glColor4f(1,1,1,1);
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glVertex3f(-0.99, -0.74, 0);
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glVertex3f(0.99, 0.74, 0);
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glVertex3f(-0.99, 0.74, 0);
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glVertex3f(0.99, -0.74, 0);
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glEnd();
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#endif
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ridx = (buf_widx - HIST_SAMPLES + BUF_SAMPLES) % BUF_SAMPLES;
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float lx, ly, lg;
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lx = ly = lg = 0;
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float gdelay[2] = {0,0};
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for (i = 0; i<HIST_SAMPLES; i++)
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{
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float g;
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bufsample_t s = buffer[ridx];
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// lowpass
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s.x = lx * 0.65 + s.x * 0.35;
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s.y = ly * 0.65 + s.y * 0.35;
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// delay brightness
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gdelay[i%2] = s.g;
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s.g = gdelay[(i+1)%2];
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float d = sqrtf((s.x-lx)*(s.x-lx) + (s.y-ly)*(s.y-ly));
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if (d == 0)
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d = 0.0001;
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float dfactor = 0.01/d;
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if (dfactor > 1.5)
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dfactor = 1.5;
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int age = HIST_SAMPLES-i;
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float factor;
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factor = (HIST_SAMPLES-age)/(float)HIST_SAMPLES;
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factor = factor*factor;
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if (fabsf(s.x-lx) < 0.001 && fabsf(s.y-ly) < 0.001) {
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g = (s.g-0.2) * factor * 1.4;
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glBegin(GL_POINTS);
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laser_color(g, 0.08);
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glVertex3f(s.x, s.y, 0);
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glEnd();
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} else {
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g = (s.g-0.2) * factor * dfactor * 1.8;
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glBegin(GL_LINES);
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laser_color(lg, 0.8);
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glVertex3f(lx, ly, 0);
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laser_color(g, 0.8);
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glVertex3f(s.x, s.y, 0);
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glEnd();
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}
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lx = s.x;
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ly = s.y;
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lg = g;
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ridx++;
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if (ridx >= BUF_SAMPLES)
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ridx = 0;
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}
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glEnd();
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glutSwapBuffers();
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}
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void key_gl(unsigned char key, int x, int y)
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{
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if (key == 27) {
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jack_client_close (client);
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glutDestroyWindow(window);
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exit(0);
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}
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}
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void resize_gl(int width, int height)
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{
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int min = width > height ? height : width;
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glViewport((width-min)/2, (height-min)/2, min, min);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho (-1, 1, -1, 1, -1, 1);
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glMatrixMode(GL_MODELVIEW);
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}
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void init_gl(int width, int height)
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{
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glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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glClearDepth(1.0);
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glDepthFunc(GL_LESS);
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glDisable(GL_DEPTH_TEST);
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glEnable(GL_BLEND);
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glBlendFunc (GL_SRC_ALPHA, GL_ONE);
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glEnable(GL_POINT_SMOOTH);
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glEnable(GL_LINE_SMOOTH);
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resize_gl(width, height);
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}
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int main (int argc, char *argv[])
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{
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if ((client = jack_client_new ("simulator")) == 0) {
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fprintf (stderr, "jack server not running?\n");
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return 1;
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}
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jack_set_process_callback (client, process, 0);
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jack_set_buffer_size_callback (client, bufsize, 0);
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jack_set_sample_rate_callback (client, srate, 0);
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jack_on_shutdown (client, jack_shutdown, 0);
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in_x = jack_port_register (client, "in_x", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
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in_y = jack_port_register (client, "in_y", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
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in_g = jack_port_register (client, "in_g", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0);
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_ALPHA | GLUT_DEPTH);
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glutInitWindowSize(640, 640);
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glutInitWindowPosition(0, 0);
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window = glutCreateWindow("OpenLase Simulator");
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glutDisplayFunc(&draw_gl);
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glutIdleFunc(&draw_gl);
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glutReshapeFunc(&resize_gl);
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glutKeyboardFunc(&key_gl);
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init_gl(640, 640);
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if (jack_activate (client)) {
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fprintf (stderr, "cannot activate client");
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return 1;
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}
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glutMainLoop();
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return 0;
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}
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