diff options
Diffstat (limited to 'nx-X11/extras/Mesa_6.4.2/progs/demos/gamma.c')
-rw-r--r-- | nx-X11/extras/Mesa_6.4.2/progs/demos/gamma.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/nx-X11/extras/Mesa_6.4.2/progs/demos/gamma.c b/nx-X11/extras/Mesa_6.4.2/progs/demos/gamma.c new file mode 100644 index 000000000..9b2c3e105 --- /dev/null +++ b/nx-X11/extras/Mesa_6.4.2/progs/demos/gamma.c @@ -0,0 +1,162 @@ + +/* Draw test patterns to help determine correct gamma value for a display. + When the intensities of the inner squares nearly match the intensities + of their frames (from some distance the borders should disappear) then + you've found the right gamma value. + + You can set Mesa's gamma values (for red, green and blue) with the + MESA_GAMMA environment variable. But only on X windows! + For example: + setenv MESA_GAMMA 1.5 1.6 1.4 + Sets the red gamma value to 1.5, green to 1.6 and blue to 1.4. + See the main README file for more information. + + For more info about gamma correction see: + http://www.inforamp.net/~poynton/notes/colour_and_gamma/GammaFAQ.html + + This program is in the public domain + + Brian Paul 19 Oct 1995 + Kai Schuetz 05 Jun 1999 */ + +/* Conversion to GLUT by Mark J. Kilgard */ + + +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <GL/glut.h> + +static void +Reshape(int width, int height) +{ + glViewport(0, 0, (GLint) width, (GLint) height); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0); + glMatrixMode(GL_MODELVIEW); + glShadeModel(GL_FLAT); +} + +/* ARGSUSED1 */ +static void +key_esc(unsigned char key, int x, int y) +{ + if(key == 27) exit(0); /* Exit on Escape */ +} + +static GLubyte p25[] = { + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, + 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, +}; + +static GLubyte p50[] = { + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, + 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, +}; + +static GLubyte p75[] = { + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, + 0xaa, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff, 0xff, +}; + +static GLubyte *stippletab[4] = {NULL, p25, p50, p75}; + +static void +gamma_ramp(GLfloat yoffs, GLfloat r, GLfloat g, GLfloat b) +{ + GLint d; + + glColor3f(0.0, 0.0, 0.0); /* solid black, no stipple */ + glRectf(-1.0, yoffs, -0.6, yoffs + 0.5); + + for(d = 1; d < 4; d++) { /* increasing density from 25% to 75% */ + GLfloat xcoord = (-1.0 + d*0.4); + GLfloat t = d * 0.25; + + glColor3f(r*t, g*t, b*t); /* draw outer rect */ + glRectf(xcoord, yoffs, xcoord+0.4, yoffs + 0.5); + + glColor3f(0.0, 0.0, 0.0); /* "clear" inner rect */ + glRectf(xcoord + 0.1, yoffs + 0.125, xcoord + 0.3, yoffs + 0.375); + + glColor3f(r, g, b); /* draw stippled inner rect */ + glEnable(GL_POLYGON_STIPPLE); + glPolygonStipple(stippletab[d]); + glRectf(xcoord + 0.1, yoffs + 0.125, xcoord + 0.3, yoffs + 0.375); + glDisable(GL_POLYGON_STIPPLE); + } + glColor3f(r, g, b); /* solid color, no stipple */ + glRectf(0.6, yoffs, 1.0, yoffs + 0.5); +} + +static void +display(void) +{ + gamma_ramp( 0.5, 1.0, 1.0, 1.0); /* white ramp */ + gamma_ramp( 0.0, 1.0, 0.0, 0.0); /* red ramp */ + gamma_ramp(-0.5, 0.0, 1.0, 0.0); /* green ramp */ + gamma_ramp(-1.0, 0.0, 0.0, 1.0); /* blue ramp */ + glFlush(); +} + +int +main(int argc, char **argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE); + + glutInitWindowPosition(50, 50); + glutInitWindowSize(500, 400); + + glutCreateWindow("gamma test patterns"); + glutReshapeFunc(Reshape); + glutDisplayFunc(display); + glutKeyboardFunc(key_esc); + + glutMainLoop(); + return 0; /* ANSI C requires main to return int. */ +} |