src/trivial/lineloop-elts.c

   1 /* Test rebasing */
   2
   3 #include <assert.h>
   4 #include <string.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <math.h>
   8 #include <glad/glad.h>
   9 #include "glut_wrap.h"
  10
  11 GLfloat verts[][4] = {
  12    {  0.9, -0.9, 0.0, 1.0 },
  13    {  0.9,  0.9, 0.0, 1.0 },
  14    { -0.9,  0.9, 0.0, 1.0 },
  15    { -0.9, -0.9, 0.0, 1.0 },
  16 };
  17
  18 GLubyte color[][4] = {
  19    { 0x00, 0x00, 0xff, 0x00 },
  20    { 0x00, 0xff, 0x00, 0x00 },
  21    { 0xff, 0x00, 0x00, 0x00 },
  22    { 0xff, 0xff, 0xff, 0x00 },
  23 };
  24
  25 GLuint indices[] = { 1, 2, 3 };
  26
  27 static void Init( void )
  28 {
  29    GLint errnum;
  30    GLuint prognum;
  31
  32    static const char *prog1 =
  33       "!!ARBvp1.0\n"
  34       "MOV  result.color, vertex.color;\n"
  35       "MOV  result.position, vertex.position;\n"
  36       "END\n";
  37
  38    glGenProgramsARB(1, &prognum);
  39    glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
  40    glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
  41                       strlen(prog1), (const GLubyte *) prog1);
  42
  43    assert(glIsProgramARB(prognum));
  44    errnum = glGetError();
  45    printf("glGetError = %d\n", errnum);
  46    if (errnum != GL_NO_ERROR)
  47    {
  48       GLint errorpos;
  49
  50       glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
  51       printf("errorpos: %d\n", errorpos);
  52       printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
  53    }
  54
  55
  56    glEnableClientState( GL_VERTEX_ARRAY );
  57    glEnableClientState( GL_COLOR_ARRAY );
  58    glVertexPointer( 3, GL_FLOAT, sizeof(verts[0]), verts );
  59    glColorPointer( 4, GL_UNSIGNED_BYTE, 0, color );
  60
  61 }
  62
  63
  64
  65 static void Display( void )
  66 {
  67    glClearColor(0.3, 0.3, 0.3, 1);
  68    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  69
  70    glEnable(GL_VERTEX_PROGRAM_NV);
  71
  72    /* Should have min_index == 1, maybe force a rebase:
  73     */
  74    glDrawElements( GL_LINE_LOOP, 3, GL_UNSIGNED_INT, indices );
  75
  76    glFlush();
  77 }
  78
  79
  80 static void Reshape( int width, int height )
  81 {
  82    glViewport( 0, 0, width, height );
  83    glMatrixMode( GL_PROJECTION );
  84    glLoadIdentity();
  85    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  86    glMatrixMode( GL_MODELVIEW );
  87    glLoadIdentity();
  88    /*glTranslatef( 0.0, 0.0, -15.0 );*/
  89 }
  90
  91
  92 static void Key( unsigned char key, int x, int y )
  93 {
  94    (void) x;
  95    (void) y;
  96    switch (key) {
  97       case 27:
  98          exit(0);
  99          break;
 100    }
 101    glutPostRedisplay();
 102 }
 103
 104
 105
 106
 107 int main( int argc, char *argv[] )
 108 {
 109    glutInit( &argc, argv );
 110    glutInitWindowPosition( 0, 0 );
 111    glutInitWindowSize( 250, 250 );
 112    glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
 113    glutCreateWindow(argv[0]);
 114    gladLoadGL();
 115    glutReshapeFunc( Reshape );
 116    glutKeyboardFunc( Key );
 117    glutDisplayFunc( Display );
 118    Init();
 119    glutMainLoop();
 120    return 0;
 121 }