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now save Targa image. misc clean-up

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This commit is contained in:
Brian Paul
2000-03-06 23:56:21 +00:00
parent 463d15add9
commit e02ffc1226
1 changed files with 97 additions and 60 deletions
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157
progs/demos/osdemo.c
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@@ -1,4 +1,4 @@
/* $Id: osdemo.c,v 1.2 2000/01/15 06:11:33 rjfrank Exp $ */
/* $Id: osdemo.c,v 1.3 2000/03/06 23:56:21 brianp Exp $ */
/*
* Demo of off-screen Mesa rendering
@@ -17,27 +17,14 @@
*/
/*
* $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 SAVE_TARGA
#define WIDTH 400
#define HEIGHT 400
@@ -143,16 +130,100 @@ static void render_image( void )
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 */
}
}
}
}
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);
}
}
int main( int argc, char *argv[] )
{
OSMesaContext ctx;
void *buffer;
/* Create an RGBA-mode context */
ctx = OSMesaCreateContext( GL_RGBA, NULL );
OSMesaContext ctx = OSMesaCreateContext( GL_RGBA, NULL );
/* Allocate the image buffer */
buffer = malloc( WIDTH * HEIGHT * 4 );
void *buffer = malloc( WIDTH * HEIGHT * 4 );
/* Bind the buffer to the context and make it current */
OSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, WIDTH, HEIGHT );
@@ -160,48 +231,14 @@ int main( int argc, char *argv[] )
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");
}
}
#ifdef SAVE_TARGA
write_targa(argv[1], buffer, WIDTH, HEIGHT);
#else
write_ppm(argv[1], buffer, WIDTH, HEIGHT);
#endif
fclose(f);
}
}
else {
printf("Specify a filename if you want to make a ppm file\n");
printf("Specify a filename if you want to make an image file\n");
}
printf("all done\n");