--- /dev/null
+/* $Id: osdemo16.c,v 1.1 2001/03/08 15:24:18 brianp 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.
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "GL/osmesa.h"
+#include "GL/glut.h"
+
+
+#define SAVE_TARGA
+
+
+#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, 0.5 };
+ GLfloat blue_mat[] = { 0.2, 0.2, 1.0, 1.0 };
+ GLfloat white_mat[] = { 1.0, 1.0, 1.0, 1.0 };
+ GLfloat purple_mat[] = { 1.0, 0.2, 1.0, 1.0 };
+ GLUquadricObj *qobj = gluNewQuadric();
+
+ 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);
+
+#if 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();
+#endif
+
+ /* red square */
+ glPushMatrix();
+ glTranslatef(0.0, -0.5, 0.0);
+ glRotatef(90, 1, 0.5, 0);
+ glScalef(3, 3, 3);
+ glDisable(GL_LIGHTING);
+ glColor4f(1, 0, 0, 0.5);
+ glBegin(GL_POLYGON);
+ glVertex2f(-1, -1);
+ glVertex2f( 1, -1);
+ glVertex2f( 1, 1);
+ glVertex2f(-1, 1);
+ glEnd();
+ glEnable(GL_LIGHTING);
+ glPopMatrix();
+
+#if 0
+ /* green square */
+ glPushMatrix();
+ glTranslatef(0.0, 0.5, 0.1);
+ glDisable(GL_LIGHTING);
+ glColor3f(0, 1, 0);
+ glBegin(GL_POLYGON);
+ glVertex2f(-1, -1);
+ glVertex2f( 1, -1);
+ glVertex2f( 1, 1);
+ glVertex2f(-1, 1);
+ glEnd();
+ glEnable(GL_LIGHTING);
+ glPopMatrix();
+
+ /* blue square */
+ glPushMatrix();
+ glTranslatef(0.75, 0.5, 0.3);
+ glDisable(GL_LIGHTING);
+ glColor3f(0, 0, 0.5);
+ glBegin(GL_POLYGON);
+ glVertex2f(-1, -1);
+ glVertex2f( 1, -1);
+ glVertex2f( 1, 1);
+ glVertex2f(-1, 1);
+ glEnd();
+ glEnable(GL_LIGHTING);
+ glPopMatrix();
+#endif
+ 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 );
+ glColor4f(0,1,0,0.5);
+ glEnable(GL_BLEND);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ gluCylinder(qobj, 1.0, 0.0, 2.0, 16, 1);
+ glDisable(GL_BLEND);
+ glPopMatrix();
+
+ glPushMatrix();
+ glTranslatef(0.75, 1.0, 1.0);
+ glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
+ gluSphere(qobj, 1.0, 20, 20);
+ glPopMatrix();
+
+ glPopMatrix();
+
+ gluDeleteQuadric(qobj);
+
+ {
+ GLint r, g, b, a;
+ glGetIntegerv(GL_RED_BITS, &r);
+ glGetIntegerv(GL_GREEN_BITS, &g);
+ glGetIntegerv(GL_BLUE_BITS, &b);
+ glGetIntegerv(GL_ALPHA_BITS, &a);
+ printf("channel sizes: %d %d %d %d\n", r, g, b, a);
+ }
+}
+
+
+
+static void
+write_targa(const char *filename, const GLushort *buffer, int width, int height)
+{
+ FILE *f = fopen( filename, "w" );
+ if (f) {
+ int i, x, y;
+ const GLushort *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] >> 8, f); /* write blue */
+ fputc(ptr[i+1] >> 8, f); /* write green */
+ fputc(ptr[i] >> 8, 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[] )
+{
+ void *buffer;
+
+ /* Create an RGBA-mode context */
+#if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
+ /* specify Z, stencil, accum sizes */
+ OSMesaContext ctx = OSMesaCreateContextExt( GL_RGBA, 16, 0, 0, NULL );
+#else
+ OSMesaContext ctx = OSMesaCreateContext( GL_RGBA, NULL );
+#endif
+ if (!ctx) {
+ printf("OSMesaCreateContext failed!\n");
+ return 0;
+ }
+
+ /* Allocate the image buffer */
+ buffer = malloc( WIDTH * HEIGHT * 4 * sizeof(GLushort));
+ 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_SHORT, WIDTH, HEIGHT )) {
+ printf("OSMesaMakeCurrent failed!\n");
+ return 0;
+ }
+
+ render_image();
+
+ if (argc>1) {
+#ifdef SAVE_TARGA
+ write_targa(argv[1], buffer, WIDTH, HEIGHT);
+#else
+ write_ppm(argv[1], 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;
+}
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