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| -rw-r--r-- | progs/tests/osdemo16.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/progs/tests/osdemo16.c b/progs/tests/osdemo16.c new file mode 100644 index 0000000000..fa83a7d857 --- /dev/null +++ b/progs/tests/osdemo16.c @@ -0,0 +1,291 @@ +/* $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; +} |