168 lines
3.8 KiB
C
168 lines
3.8 KiB
C
/*
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* Demo of off-screen Mesa rendering
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*
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* See Mesa/include/GL/osmesa.h for documentation of the OSMesa functions.
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*
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* If you want to render BIG images you'll probably have to increase
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* MAX_WIDTH and MAX_Height in src/config.h.
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*
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* This program is in the public domain.
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*
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* Brian Paul
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*
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* PPM output provided by Joerg Schmalzl.
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* ASCII PPM output added by Brian Paul.
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*
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* Usage: osdemo [filename]
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*/
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <assert.h>
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#define GL_GLEXT_PROTOTYPES
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#include "GL/osmesa.h"
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#include <GL/glext.h>
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#include "eglut.h"
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#include <kos32sys.h>
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void init(void);
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void reshape(int width, int height);
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void draw(void);
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void keyboard(unsigned char key);
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extern GLfloat angle;
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static void idle(void)
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{
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static uint32_t t0;
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uint32_t t, dt;
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t = get_tick_count();
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dt = t - t0;
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t0 = t;
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angle += 70.0 * dt / 100; /* 70 degrees per second */
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if (angle > 3600.0)
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angle -= 3600.0;
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}
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static int time_now(void)
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{
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struct timeval tv;
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struct timezone tz;
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(void) gettimeofday(&tv, &tz);
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return tv.tv_sec * 1000 + tv.tv_usec / 1000;
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}
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int main(int argc, char *argv[])
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{
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int Width = 384;
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int Height = 384;
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OSMesaContext ctx;
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void *buffer;
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char *filename = NULL;
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int ev;
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int repeat=1;
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/* Create an RGBA-mode context */
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/* specify Z, stencil, accum sizes */
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ctx = OSMesaCreateContextExt( OSMESA_BGRA, 16, 0, 0, NULL );
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if (!ctx) {
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printf("OSMesaCreateContext failed!\n");
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return 0;
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}
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/* Allocate the image buffer */
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buffer = malloc( Width * Height * 4 * sizeof(GLubyte) );
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if (!buffer) {
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printf("Alloc image buffer failed!\n");
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return 0;
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}
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/* Bind the buffer to the context and make it current */
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if (!OSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, Width, Height )) {
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printf("OSMesaMakeCurrent failed!\n");
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return 0;
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}
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{
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int z, s, a;
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glGetIntegerv(GL_DEPTH_BITS, &z);
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glGetIntegerv(GL_STENCIL_BITS, &s);
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glGetIntegerv(GL_ACCUM_RED_BITS, &a);
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printf("Depth=%d Stencil=%d Accum=%d\n", z, s, a);
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}
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reshape(Width, Height);
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glClearColor( 0, 0, 0, 1);
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init();
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draw();
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DrawWindow(10, 10, Width+TYPE_3_BORDER_WIDTH*2, Height+TYPE_3_BORDER_WIDTH+get_skin_height(),
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"OpenGL Engine Demo", 0x000000, 0x74);
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Blit(buffer, TYPE_3_BORDER_WIDTH, get_skin_height(), 0, 0, Width, Height, Width,Height,Width*4);
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int start = time_now();
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int frames = 0;
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while(repeat)
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{
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int now = time_now();
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oskey_t key;
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ev = check_os_event();
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switch(ev)
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{
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case 1:
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DrawWindow(0,0,0,0, NULL, 0x000000,0x74);
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break;
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case 2:
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key = get_key();
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keyboard(key.code);
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break;
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case 3:
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if(get_os_button()==1)
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repeat=0;
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continue;
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};
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if (now - start >= 5000)
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{
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double elapsed = (double) (now - start) / 1000.0;
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printf("%d frames in %3.1f seconds = %6.3f FPS\n",
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frames, elapsed, frames / elapsed);
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fflush(stdout);
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start = now;
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frames = 0;
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}
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idle();
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draw();
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glFlush();
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Blit(buffer, TYPE_3_BORDER_WIDTH, get_skin_height(), 0, 0, Width, Height, Width,Height,Width*4);
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frames++;
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};
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/* free the image buffer */
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free( buffer );
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/* destroy the context */
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OSMesaDestroyContext( ctx );
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return 0;
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}
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