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#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define GL_GLEXT_PROTOTYPES
#include <GL/glut.h>
static float Zrot = 0.0;
static void Display( void )
{
glClearColor(0.3, 0.3, 0.3, 1);
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glEnable(GL_VERTEX_PROGRAM_ARB);
glLoadIdentity();
glRotatef(Zrot, 0, 0, 1);
glPushMatrix();
glVertexAttrib3fARB(3, 1, 0.5, 0.25);
glBegin(GL_TRIANGLES);
#if 1
glVertexAttrib3fARB(3, 1.0, 0.0, 0.0);
glVertexAttrib2fARB(0, -0.5, -0.5);
glVertexAttrib3fARB(3, 0.0, 1.0, 0.0);
glVertexAttrib2fARB(0, 0.5, -0.5);
glVertexAttrib3fARB(3, 0.0, 0.0, 1.0);
glVertexAttrib2fARB(0, 0, 0.5);
#else
glVertex2f( -1, -1);
glVertex2f( 1, -1);
glVertex2f( 0, 1);
#endif
glEnd();
glPopMatrix();
glutSwapBuffers();
}
static void Reshape( int width, int height )
{
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
/* glFrustum( -2.0, 2.0, -2.0, 2.0, 5.0, 25.0 );*/
glOrtho(-2.0, 2.0, -2.0, 2.0, -2.0, 2.0 );
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 'z':
Zrot -= 5.0;
break;
case 'Z':
Zrot += 5.0;
break;
case 27:
exit(0);
break;
}
glutPostRedisplay();
}
static void Init( void )
{
GLint errno;
GLuint prognum;
static const char *prog1 =
"!!ARBvp1.0\n"
"MOV result.color, vertex.attrib[3];\n"
"DP4 result.position.x, vertex.position, state.matrix.modelview.row[0];\n"
"DP4 result.position.y, vertex.position, state.matrix.modelview.row[1];\n"
"DP4 result.position.z, vertex.position, state.matrix.modelview.row[2];\n"
"DP4 result.position.w, vertex.position, state.matrix.modelview.row[3];\n"
"END\n";
glGenProgramsARB(1, &prognum);
glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
strlen(prog1), (const GLubyte *) prog1);
assert(glIsProgramARB(prognum));
errno = glGetError();
printf("glGetError = %d\n", errno);
if (errno != GL_NO_ERROR)
{
GLint errorpos;
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
printf("errorpos: %d\n", errorpos);
printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
}
}
int main( int argc, char *argv[] )
{
glutInit( &argc, argv );
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( 250, 250 );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
glutCreateWindow(argv[0]);
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutDisplayFunc( Display );
Init();
glutMainLoop();
return 0;
}
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