181 lines
4.1 KiB
C
181 lines
4.1 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 <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 "GL/glu.h"
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#include "shaderutil.h"
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#include <kos32sys.h>
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int _CRT_MT=0;
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static int Width = 500;
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static int Height = 400;
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int check_events();
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GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
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GLfloat angle = 0.0;
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GLboolean animate = GL_TRUE; /* Animation */
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GLfloat eyesep = 5.0; /* Eye separation. */
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GLfloat fix_point = 40.0; /* Fixation point distance. */
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GLfloat left, right, asp; /* Stereo frustum params. */
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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 Idle();
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void Key(unsigned char key, int x, int y);
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inline void Blit(void *bitmap, int dst_x, int dst_y,
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int src_x, int src_y, int w, int h,
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int src_w, int src_h, int stride)
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{
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volatile struct blit_call bc;
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bc.dstx = dst_x;
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bc.dsty = dst_y;
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bc.w = w;
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bc.h = h;
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bc.srcx = src_x;
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bc.srcy = src_y;
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bc.srcw = src_w;
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bc.srch = src_h;
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bc.stride = stride;
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bc.bitmap = bitmap;
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__asm__ __volatile__(
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"int $0x40"
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::"a"(73),"b"(0),"c"(&bc.dstx));
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};
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static inline uint32_t wait_os_event(int time)
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{
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uint32_t val;
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__asm__ __volatile__(
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"int $0x40"
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:"=a"(val)
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:"a"(23),"b"(time));
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return val;
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};
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int main(int argc, char *argv[])
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{
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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_RGBA, 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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// __asm__ __volatile__("int3");
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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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Init();
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Draw();
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printf("all done\n");
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DrawWindow(10, 10, Width+9, Height+26, "OpenGL Engine Demo", 0x000000, 0x74);
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Blit(buffer, 5, 22, 0, 0, Width, Height, Width,Height,Width*4);
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while(repeat)
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{
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oskey_t key;
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ev = wait_os_event(1);
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switch(ev)
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{
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case 1:
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DrawWindow(10, 10, Width+9, Width+26, NULL, 0x000000,0x74);
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Blit(buffer, 5, 22, 0, 0, Width, Height, Width,Height,Width*4);
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continue;
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case 2:
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key = get_key();
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Key(key.code, 0, 0);
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Draw();
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Blit(buffer, 5, 22, 0, 0, Width, Height, Width,Height,Width*4);
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continue;
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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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Idle();
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Draw();
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Blit(buffer, 5, 22, 0, 0, Width, Height, Width,Height,Width*4);
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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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int atexit(void (*func)(void))
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{
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return 0;
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};
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