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/* Basic VBO */
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "glad/gl.h"
#include "glut_wrap.h"
#define ELTOBJ 0
struct {
GLfloat pos[3];
GLubyte color[4];
} verts[] =
{
{ { 0.9, -0.9, 0.0 },
{ 0x00, 0x00, 0xff, 0x00 }
},
{ { 0.9, 0.9, 0.0 },
{ 0x00, 0xff, 0x00, 0x00 }
},
{ { -0.9, 0.9, 0.0 },
{ 0xff, 0x00, 0x00, 0x00 }
},
{ { -0.9, -0.9, 0.0 },
{ 0xff, 0xff, 0xff, 0x00 }
},
};
GLuint indices[] = { 1, 2, 3 };
GLuint arrayObj, elementObj;
static void Init( void )
{
GLint errnum;
GLuint prognum;
static const char *prog1 =
"!!ARBvp1.0\n"
"MOV result.color, vertex.color;\n"
"MOV result.position, vertex.position;\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));
errnum = glGetError();
printf("glGetError = %d\n", errnum);
if (errnum != 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));
}
glEnableClientState( GL_VERTEX_ARRAY );
glEnableClientState( GL_COLOR_ARRAY );
glGenBuffersARB(1, &arrayObj);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), verts, GL_STATIC_DRAW_ARB);
#if ELTOBJ
glGenBuffersARB(1, &elementObj);
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, elementObj);
glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, sizeof(indices), indices, GL_STATIC_DRAW_ARB);
#endif
glVertexPointer( 3, GL_FLOAT, sizeof(verts[0]), 0 );
glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof(verts[0]), (void *)(3*sizeof(float)) );
}
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);
#if ELTOBJ
glDrawRangeElements( GL_TRIANGLES, 1, 3, 3, GL_UNSIGNED_INT, NULL );
#else
glDrawRangeElements( GL_TRIANGLES, 1, 3, 3, GL_UNSIGNED_INT, indices );
#endif
glFlush();
}
static void Reshape( int width, int height )
{
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
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:
exit(0);
break;
}
glutPostRedisplay();
}
int main( int argc, char *argv[] )
{
glutInit( &argc, argv );
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( 250, 250 );
glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
glutCreateWindow(argv[0]);
gladLoaderLoadGL();
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutDisplayFunc( Display );
Init();
glutMainLoop();
gladLoaderUnloadGL();
return 0;
}
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