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/**
* Just compile ARB vert/frag program from named file(s).
*/
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <GL/glut.h>
static GLuint FragProg;
static GLuint VertProg;
static GLint Win;
static PFNGLPROGRAMLOCALPARAMETER4FVARBPROC glProgramLocalParameter4fvARB_func;
static PFNGLPROGRAMLOCALPARAMETER4DARBPROC glProgramLocalParameter4dARB_func;
static PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC glGetProgramLocalParameterdvARB_func;
static PFNGLGENPROGRAMSARBPROC glGenProgramsARB_func;
static PFNGLPROGRAMSTRINGARBPROC glProgramStringARB_func;
static PFNGLBINDPROGRAMARBPROC glBindProgramARB_func;
static PFNGLISPROGRAMARBPROC glIsProgramARB_func;
static PFNGLDELETEPROGRAMSARBPROC glDeleteProgramsARB_func;
static void Redisplay( void )
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glutSwapBuffers();
exit(0);
}
static void Reshape( int width, int height )
{
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( 0.0, 0.0, -15.0 );
}
static void Key( unsigned char key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case 27:
glDeleteProgramsARB_func(1, &VertProg);
glDeleteProgramsARB_func(1, &FragProg);
glutDestroyWindow(Win);
exit(0);
break;
}
glutPostRedisplay();
}
/* A helper for finding errors in program strings */
static int FindLine( const char *program, int position )
{
int i, line = 1;
for (i = 0; i < position; i++) {
if (program[i] == '\n')
line++;
}
return line;
}
static void Init( const char *vertProgFile,
const char *fragProgFile )
{
GLint errorPos;
char buf[10*1000];
if (!glutExtensionSupported("GL_ARB_vertex_program")) {
printf("Sorry, this demo requires GL_ARB_vertex_program\n");
exit(1);
}
if (!glutExtensionSupported("GL_ARB_fragment_program")) {
printf("Sorry, this demo requires GL_ARB_fragment_program\n");
exit(1);
}
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
/*
* Get extension function pointers.
*/
glProgramLocalParameter4fvARB_func = (PFNGLPROGRAMLOCALPARAMETER4FVARBPROC) glutGetProcAddress("glProgramLocalParameter4fvARB");
assert(glProgramLocalParameter4fvARB_func);
glProgramLocalParameter4dARB_func = (PFNGLPROGRAMLOCALPARAMETER4DARBPROC) glutGetProcAddress("glProgramLocalParameter4dARB");
assert(glProgramLocalParameter4dARB_func);
glGetProgramLocalParameterdvARB_func = (PFNGLGETPROGRAMLOCALPARAMETERDVARBPROC) glutGetProcAddress("glGetProgramLocalParameterdvARB");
assert(glGetProgramLocalParameterdvARB_func);
glGenProgramsARB_func = (PFNGLGENPROGRAMSARBPROC) glutGetProcAddress("glGenProgramsARB");
assert(glGenProgramsARB_func);
glProgramStringARB_func = (PFNGLPROGRAMSTRINGARBPROC) glutGetProcAddress("glProgramStringARB");
assert(glProgramStringARB_func);
glBindProgramARB_func = (PFNGLBINDPROGRAMARBPROC) glutGetProcAddress("glBindProgramARB");
assert(glBindProgramARB_func);
glIsProgramARB_func = (PFNGLISPROGRAMARBPROC) glutGetProcAddress("glIsProgramARB");
assert(glIsProgramARB_func);
glDeleteProgramsARB_func = (PFNGLDELETEPROGRAMSARBPROC) glutGetProcAddress("glDeleteProgramsARB");
assert(glDeleteProgramsARB_func);
/*
* Vertex program
*/
if (vertProgFile) {
FILE *f;
int len;
glGenProgramsARB_func(1, &VertProg);
assert(VertProg > 0);
glBindProgramARB_func(GL_VERTEX_PROGRAM_ARB, VertProg);
f = fopen(vertProgFile, "r");
if (!f) {
printf("Unable to open %s\n", fragProgFile);
exit(1);
}
len = fread(buf, 1, 10*1000,f);
fclose(f);
glProgramStringARB_func(GL_VERTEX_PROGRAM_ARB,
GL_PROGRAM_FORMAT_ASCII_ARB,
len,
(const GLubyte *) buf);
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorPos);
if (glGetError() != GL_NO_ERROR || errorPos != -1) {
int l = FindLine(buf, errorPos);
printf("Vertex Program Error (pos=%d line=%d): %s\n", errorPos, l,
(char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
exit(0);
}
else {
glEnable(GL_VERTEX_PROGRAM_ARB);
printf("Vertex Program OK\n");
}
}
/*
* Fragment program
*/
if (fragProgFile) {
FILE *f;
int len;
glGenProgramsARB_func(1, &FragProg);
assert(FragProg > 0);
glBindProgramARB_func(GL_FRAGMENT_PROGRAM_ARB, FragProg);
f = fopen(fragProgFile, "r");
if (!f) {
printf("Unable to open %s\n", fragProgFile);
exit(1);
}
len = fread(buf, 1, 10*1000,f);
fclose(f);
glProgramStringARB_func(GL_FRAGMENT_PROGRAM_ARB,
GL_PROGRAM_FORMAT_ASCII_ARB,
len,
(const GLubyte *) buf);
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorPos);
if (glGetError() != GL_NO_ERROR || errorPos != -1) {
int l = FindLine(buf, errorPos);
printf("Fragment Program Error (pos=%d line=%d): %s\n", errorPos, l,
(char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
exit(0);
}
else {
glEnable(GL_FRAGMENT_PROGRAM_ARB);
printf("Fragment Program OK\n");
}
}
}
int main( int argc, char *argv[] )
{
const char *vertProgFile = NULL, *fragProgFile = NULL;
int i;
glutInit( &argc, argv );
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( 200, 200 );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
Win = glutCreateWindow(argv[0]);
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutDisplayFunc( Redisplay );
if (argc == 1) {
printf("arbgpuprog:\n");
printf(" Compile GL_ARB_vertex/fragment_programs, report any errors.\n");
printf("Usage:\n");
printf(" arbgpuprog [--vp vertprogfile] [--fp fragprogfile]\n");
exit(1);
}
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "--vp") == 0) {
vertProgFile = argv[i+1];
i++;
}
else if (strcmp(argv[i], "--fp") == 0) {
fragProgFile = argv[i+1];
i++;
}
}
Init(vertProgFile, fragProgFile);
glutMainLoop();
return 0;
}
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