317 lines
8.1 KiB
C
317 lines
8.1 KiB
C
|
/*
|
||
|
* 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.
|
||
|
*
|
||
|
* Usage: osdemo [filename]
|
||
|
*/
|
||
|
|
||
|
|
||
|
#include <math.h>
|
||
|
#include <stdio.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <string.h>
|
||
|
#include "GL/osmesa.h"
|
||
|
#include "GL/glu.h"
|
||
|
|
||
|
|
||
|
#define SAVE_TARGA
|
||
|
|
||
|
#define WIDTH 400
|
||
|
#define HEIGHT 400
|
||
|
|
||
|
|
||
|
static void
|
||
|
Sphere(float radius, int slices, int stacks)
|
||
|
{
|
||
|
GLUquadric *q = gluNewQuadric();
|
||
|
gluQuadricNormals(q, GLU_SMOOTH);
|
||
|
gluSphere(q, radius, slices, stacks);
|
||
|
gluDeleteQuadric(q);
|
||
|
}
|
||
|
|
||
|
|
||
|
static void
|
||
|
Cone(float base, float height, int slices, int stacks)
|
||
|
{
|
||
|
GLUquadric *q = gluNewQuadric();
|
||
|
gluQuadricDrawStyle(q, GLU_FILL);
|
||
|
gluQuadricNormals(q, GLU_SMOOTH);
|
||
|
gluCylinder(q, base, 0.0, height, slices, stacks);
|
||
|
gluDeleteQuadric(q);
|
||
|
}
|
||
|
|
||
|
|
||
|
static void
|
||
|
Torus(float innerRadius, float outerRadius, int sides, int rings)
|
||
|
{
|
||
|
/* from GLUT... */
|
||
|
int i, j;
|
||
|
GLfloat theta, phi, theta1;
|
||
|
GLfloat cosTheta, sinTheta;
|
||
|
GLfloat cosTheta1, sinTheta1;
|
||
|
const GLfloat ringDelta = 2.0 * M_PI / rings;
|
||
|
const GLfloat sideDelta = 2.0 * M_PI / sides;
|
||
|
|
||
|
theta = 0.0;
|
||
|
cosTheta = 1.0;
|
||
|
sinTheta = 0.0;
|
||
|
for (i = rings - 1; i >= 0; i--) {
|
||
|
theta1 = theta + ringDelta;
|
||
|
cosTheta1 = cos(theta1);
|
||
|
sinTheta1 = sin(theta1);
|
||
|
glBegin(GL_QUAD_STRIP);
|
||
|
phi = 0.0;
|
||
|
for (j = sides; j >= 0; j--) {
|
||
|
GLfloat cosPhi, sinPhi, dist;
|
||
|
|
||
|
phi += sideDelta;
|
||
|
cosPhi = cos(phi);
|
||
|
sinPhi = sin(phi);
|
||
|
dist = outerRadius + innerRadius * cosPhi;
|
||
|
|
||
|
glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi);
|
||
|
glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, innerRadius * sinPhi);
|
||
|
glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi);
|
||
|
glVertex3f(cosTheta * dist, -sinTheta * dist, innerRadius * sinPhi);
|
||
|
}
|
||
|
glEnd();
|
||
|
theta = theta1;
|
||
|
cosTheta = cosTheta1;
|
||
|
sinTheta = sinTheta1;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
|
||
|
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 );
|
||
|
Torus(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 );
|
||
|
Cone(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 );
|
||
|
Sphere(1.0, 20, 20);
|
||
|
glPopMatrix();
|
||
|
|
||
|
glPopMatrix();
|
||
|
|
||
|
/* This is very important!!!
|
||
|
* Make sure buffered commands are finished!!!
|
||
|
*/
|
||
|
glFinish();
|
||
|
}
|
||
|
|
||
|
|
||
|
#ifdef SAVE_TARGA
|
||
|
|
||
|
static void
|
||
|
write_targa(const char *filename, const GLubyte *buffer, int width, int height)
|
||
|
{
|
||
|
FILE *f = fopen( filename, "w" );
|
||
|
if (f) {
|
||
|
int i, x, y;
|
||
|
const GLubyte *ptr = buffer;
|
||
|
printf ("osdemo, writing tga file \n");
|
||
|
fputc (0x00, f); /* ID Length, 0 => No ID */
|
||
|
fputc (0x00, f); /* Color Map Type, 0 => No color map included */
|
||
|
fputc (0x02, f); /* Image Type, 2 => Uncompressed, True-color Image */
|
||
|
fputc (0x00, f); /* Next five bytes are about the color map entries */
|
||
|
fputc (0x00, f); /* 2 bytes Index, 2 bytes length, 1 byte size */
|
||
|
fputc (0x00, f);
|
||
|
fputc (0x00, f);
|
||
|
fputc (0x00, f);
|
||
|
fputc (0x00, f); /* X-origin of Image */
|
||
|
fputc (0x00, f);
|
||
|
fputc (0x00, f); /* Y-origin of Image */
|
||
|
fputc (0x00, f);
|
||
|
fputc (WIDTH & 0xff, f); /* Image Width */
|
||
|
fputc ((WIDTH>>8) & 0xff, f);
|
||
|
fputc (HEIGHT & 0xff, f); /* Image Height */
|
||
|
fputc ((HEIGHT>>8) & 0xff, f);
|
||
|
fputc (0x18, f); /* Pixel Depth, 0x18 => 24 Bits */
|
||
|
fputc (0x20, f); /* Image Descriptor */
|
||
|
fclose(f);
|
||
|
f = fopen( filename, "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+2], f); /* write blue */
|
||
|
fputc(ptr[i+1], f); /* write green */
|
||
|
fputc(ptr[i], f); /* write red */
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
#else
|
||
|
|
||
|
static void
|
||
|
write_ppm(const char *filename, const GLubyte *buffer, int width, int height)
|
||
|
{
|
||
|
const int binary = 0;
|
||
|
FILE *f = fopen( filename, "w" );
|
||
|
if (f) {
|
||
|
int i, x, y;
|
||
|
const GLubyte *ptr = buffer;
|
||
|
if (binary) {
|
||
|
fprintf(f,"P6\n");
|
||
|
fprintf(f,"# ppm-file created by osdemo.c\n");
|
||
|
fprintf(f,"%i %i\n", width,height);
|
||
|
fprintf(f,"255\n");
|
||
|
fclose(f);
|
||
|
f = fopen( filename, "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 osdemo.c\n");
|
||
|
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");
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
fclose(f);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
#endif
|
||
|
|
||
|
|
||
|
|
||
|
int
|
||
|
main(int argc, char *argv[])
|
||
|
{
|
||
|
void *buffer;
|
||
|
int i;
|
||
|
char *filename = NULL;
|
||
|
|
||
|
/* Create an RGBA-mode context */
|
||
|
#if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
|
||
|
/* specify Z, stencil, accum sizes */
|
||
|
OSMesaContext ctx = OSMesaCreateContextExt( OSMESA_RGBA, 16, 0, 0, NULL );
|
||
|
#else
|
||
|
OSMesaContext ctx = OSMesaCreateContext( OSMESA_RGBA, NULL );
|
||
|
#endif
|
||
|
if (!ctx) {
|
||
|
printf("OSMesaCreateContext failed!\n");
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
for (i = 1; i < argc; i++) {
|
||
|
if (argv[i][0] != '-')
|
||
|
filename = argv[i];
|
||
|
}
|
||
|
|
||
|
/* Allocate the image buffer */
|
||
|
buffer = malloc( WIDTH * HEIGHT * 4 * sizeof(GLubyte) );
|
||
|
if (!buffer) {
|
||
|
printf("Alloc image buffer failed!\n");
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* Bind the buffer to the context and make it current */
|
||
|
if (!OSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, WIDTH, HEIGHT )) {
|
||
|
printf("OSMesaMakeCurrent failed!\n");
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
|
||
|
{
|
||
|
int z, s, a;
|
||
|
glGetIntegerv(GL_DEPTH_BITS, &z);
|
||
|
glGetIntegerv(GL_STENCIL_BITS, &s);
|
||
|
glGetIntegerv(GL_ACCUM_RED_BITS, &a);
|
||
|
printf("Depth=%d Stencil=%d Accum=%d\n", z, s, a);
|
||
|
}
|
||
|
|
||
|
render_image();
|
||
|
|
||
|
if (filename != NULL) {
|
||
|
#ifdef SAVE_TARGA
|
||
|
write_targa(filename, buffer, WIDTH, HEIGHT);
|
||
|
#else
|
||
|
write_ppm(filename, buffer, WIDTH, HEIGHT);
|
||
|
#endif
|
||
|
}
|
||
|
else {
|
||
|
printf("Specify a filename if you want to make an image file\n");
|
||
|
}
|
||
|
|
||
|
printf("all done\n");
|
||
|
|
||
|
/* free the image buffer */
|
||
|
free( buffer );
|
||
|
|
||
|
/* destroy the context */
|
||
|
OSMesaDestroyContext( ctx );
|
||
|
|
||
|
return 0;
|
||
|
}
|