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- /* $Id: osdemo.c,v 1.2 2000/01/15 06:11:33 rjfrank 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 1.2 2000/01/15 06:11:33 rjfrank
- * Added test for the occlusion test code.
- *
- * Revision 1.1.1.1 1999/08/19 00:55:40 jtg
- * Imported sources
- *
- * 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();
-
- #ifdef OSMESA_OCCLUSION_TEST_RESULT_HP
- {
- GLboolean bRet;
- OSMesaGetBooleanv(OSMESA_OCCLUSION_TEST_RESULT_HP,&bRet);
- glDepthMask(GL_FALSE);
- glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE);
-
- 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();
-
- OSMesaGetBooleanv(OSMESA_OCCLUSION_TEST_RESULT_HP,&bRet);
- printf("Occlusion test 1 (result should be 1): %d\n",bRet);
-
- glDepthMask(GL_TRUE);
- glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_TRUE);
- }
- #endif
-
- 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();
-
- #ifdef OSMESA_OCCLUSION_TEST_RESULT_HP
- {
- GLboolean bRet;
-
- OSMesaGetBooleanv(OSMESA_OCCLUSION_TEST_RESULT_HP,&bRet);
- glDepthMask(GL_FALSE);
- glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE);
-
- /* draw a sphere inside the previous sphere */
- glPushMatrix();
- glTranslatef(0.75, 0.0, -1.0);
- glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
- glutSolidSphere(0.5, 20, 20);
- glPopMatrix();
-
- OSMesaGetBooleanv(OSMESA_OCCLUSION_TEST_RESULT_HP,&bRet);
- printf("Occlusion test 2 (result should be 0): %d\n",bRet);
-
- glDepthMask(GL_TRUE);
- glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_TRUE);
- }
- #endif
-
- 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;
- }
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