1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/* $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;
}
|
