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Diffstat (limited to 'progs/demos/osdemo.c')
| -rw-r--r-- | progs/demos/osdemo.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/progs/demos/osdemo.c b/progs/demos/osdemo.c new file mode 100644 index 00000000000..f69cd22fad1 --- /dev/null +++ b/progs/demos/osdemo.c @@ -0,0 +1,169 @@ +/* $Id: osdemo.c,v 1.1 1999/08/19 00:55:40 jtg Exp $ */ + +/* + * Demo of off-screen Mesa rendering + * + * See Mesa/include/GL/osmesa.h for documentation of the OSMesa functions. + * + * If you want to render BIG images you'll probably have to increase + * MAX_WIDTH and MAX_HEIGHT in src/config.h. + * + * This program is in the public domain. + * + * Brian Paul + * + * PPM output provided by Joerg Schmalzl. + * ASCII PPM output added by Brian Paul. + */ + + +/* + * $Log: osdemo.c,v $ + * Revision 1.1 1999/08/19 00:55:40 jtg + * Initial revision + * + * Revision 3.0 1998/02/14 18:42:29 brianp + * initial rev + * + */ + + + +#include <stdio.h> +#include <stdlib.h> +#include "GL/osmesa.h" +#include "GL/glut.h" + + + +#define WIDTH 400 +#define HEIGHT 400 + + + +static void render_image( void ) +{ + GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 }; + GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 }; + GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 }; + GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 }; + GLfloat red_mat[] = { 1.0, 0.2, 0.2, 1.0 }; + GLfloat green_mat[] = { 0.2, 1.0, 0.2, 1.0 }; + GLfloat blue_mat[] = { 0.2, 0.2, 1.0, 1.0 }; + + + glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient); + glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); + glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular); + glLightfv(GL_LIGHT0, GL_POSITION, light_position); + + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + glEnable(GL_DEPTH_TEST); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-2.5, 2.5, -2.5, 2.5, -10.0, 10.0); + glMatrixMode(GL_MODELVIEW); + + glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); + + glPushMatrix(); + glRotatef(20.0, 1.0, 0.0, 0.0); + + glPushMatrix(); + glTranslatef(-0.75, 0.5, 0.0); + glRotatef(90.0, 1.0, 0.0, 0.0); + glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red_mat ); + glutSolidTorus(0.275, 0.85, 20, 20); + glPopMatrix(); + + glPushMatrix(); + glTranslatef(-0.75, -0.5, 0.0); + glRotatef(270.0, 1.0, 0.0, 0.0); + glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green_mat ); + glutSolidCone(1.0, 2.0, 16, 1); + glPopMatrix(); + + glPushMatrix(); + glTranslatef(0.75, 0.0, -1.0); + glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat ); + glutSolidSphere(1.0, 20, 20); + glPopMatrix(); + + glPopMatrix(); +} + + + +int main( int argc, char *argv[] ) +{ + OSMesaContext ctx; + void *buffer; + + /* Create an RGBA-mode context */ + ctx = OSMesaCreateContext( GL_RGBA, NULL ); + + /* Allocate the image buffer */ + buffer = malloc( WIDTH * HEIGHT * 4 ); + + /* Bind the buffer to the context and make it current */ + OSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, WIDTH, HEIGHT ); + + render_image(); + + if (argc>1) { + /* write PPM file */ + FILE *f = fopen( argv[1], "w" ); + if (f) { + int i, x, y; + GLubyte *ptr = (GLubyte *) buffer; +#define BINARY 0 +#if BINARY + fprintf(f,"P6\n"); + fprintf(f,"# ppm-file created by %s\n", argv[0]); + fprintf(f,"%i %i\n", WIDTH,HEIGHT); + fprintf(f,"255\n"); + fclose(f); + f = fopen( argv[1], "ab" ); /* reopen in binary append mode */ + for (y=HEIGHT-1; y>=0; y--) { + for (x=0; x<WIDTH; x++) { + i = (y*WIDTH + x) * 4; + fputc(ptr[i], f); /* write red */ + fputc(ptr[i+1], f); /* write green */ + fputc(ptr[i+2], f); /* write blue */ + } + } +#else /*ASCII*/ + int counter = 0; + fprintf(f,"P3\n"); + fprintf(f,"# ascii ppm file created by %s\n", argv[0]); + fprintf(f,"%i %i\n", WIDTH, HEIGHT); + fprintf(f,"255\n"); + for (y=HEIGHT-1; y>=0; y--) { + for (x=0; x<WIDTH; x++) { + i = (y*WIDTH + x) * 4; + fprintf(f, " %3d %3d %3d", ptr[i], ptr[i+1], ptr[i+2]); + counter++; + if (counter % 5 == 0) + fprintf(f, "\n"); + } + } +#endif + fclose(f); + } + } + else { + printf("Specify a filename if you want to make a ppm file\n"); + } + + printf("all done\n"); + + /* free the image buffer */ + free( buffer ); + + /* destroy the context */ + OSMesaDestroyContext( ctx ); + + return 0; +} |