src/tests/yuvrect.c

   1 /*
   2  * Test the GL_NV_texture_rectangle and GL_MESA_ycrcb_texture extensions.
   3  *
   4  * Brian Paul   13 September 2002
   5  */
   6
   7 #include <assert.h>
   8 #include <math.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #define GL_GLEXT_PROTOTYPES
  13 #include <GL/glut.h>
  14
  15 #include "../util/readtex.c"   /* I know, this is a hack. */
  16
  17 #define TEXTURE_FILE "../images/girl.rgb"
  18
  19 static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
  20 static GLint ImgWidth, ImgHeight;
  21 static GLushort *ImageYUV = NULL;
  22
  23
  24 static void DrawObject(void)
  25 {
  26    glBegin(GL_QUADS);
  27
  28    glTexCoord2f(0, 0);
  29    glVertex2f(-1.0, -1.0);
  30
  31    glTexCoord2f(ImgWidth, 0);
  32    glVertex2f(1.0, -1.0);
  33
  34    glTexCoord2f(ImgWidth, ImgHeight);
  35    glVertex2f(1.0, 1.0);
  36
  37    glTexCoord2f(0, ImgHeight);
  38    glVertex2f(-1.0, 1.0);
  39
  40    glEnd();
  41 }
  42
  43
  44 static void Display( void )
  45 {
  46    glClear( GL_COLOR_BUFFER_BIT );
  47
  48    glPushMatrix();
  49       glRotatef(Xrot, 1.0, 0.0, 0.0);
  50       glRotatef(Yrot, 0.0, 1.0, 0.0);
  51       glRotatef(Zrot, 0.0, 0.0, 1.0);
  52       DrawObject();
  53    glPopMatrix();
  54
  55    glutSwapBuffers();
  56 }
  57
  58
  59 static void Reshape( int width, int height )
  60 {
  61    glViewport( 0, 0, width, height );
  62    glMatrixMode( GL_PROJECTION );
  63    glLoadIdentity();
  64    glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
  65    glMatrixMode( GL_MODELVIEW );
  66    glLoadIdentity();
  67    glTranslatef( 0.0, 0.0, -15.0 );
  68 }
  69
  70
  71 static void Key( unsigned char key, int x, int y )
  72 {
  73    (void) x;
  74    (void) y;
  75    switch (key) {
  76       case 27:
  77          exit(0);
  78          break;
  79    }
  80    glutPostRedisplay();
  81 }
  82
  83
  84 static void SpecialKey( int key, int x, int y )
  85 {
  86    float step = 3.0;
  87    (void) x;
  88    (void) y;
  89
  90    switch (key) {
  91       case GLUT_KEY_UP:
  92          Xrot += step;
  93          break;
  94       case GLUT_KEY_DOWN:
  95          Xrot -= step;
  96          break;
  97       case GLUT_KEY_LEFT:
  98          Yrot += step;
  99          break;
 100       case GLUT_KEY_RIGHT:
 101          Yrot -= step;
 102          break;
 103    }
 104    glutPostRedisplay();
 105 }
 106
 107
 108
 109 static void Init( int argc, char *argv[] )
 110 {
 111    GLuint texObj = 100;
 112    const char *file;
 113
 114    if (!glutExtensionSupported("GL_NV_texture_rectangle")) {
 115       printf("Sorry, GL_NV_texture_rectangle is required\n");
 116       exit(0);
 117    }
 118
 119    if (!glutExtensionSupported("GL_MESA_ycbcr_texture")) {
 120       printf("Sorry, GL_MESA_ycbcr_texture is required\n");
 121       exit(0);
 122    }
 123
 124    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 125
 126    glBindTexture(GL_TEXTURE_RECTANGLE_NV, texObj);
 127 #ifdef LINEAR_FILTER
 128    /* linear filtering looks much nicer but is much slower for Mesa */
 129    glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 130    glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 131 #else
 132    glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 133    glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 134 #endif
 135
 136    if (argc > 1)
 137       file = argv[1];
 138    else
 139       file = TEXTURE_FILE;
 140
 141    ImageYUV = LoadYUVImage(file, &ImgWidth, &ImgHeight);
 142    if (!ImageYUV) {
 143       printf("Couldn't read %s\n", TEXTURE_FILE);
 144       exit(0);
 145    }
 146
 147    printf("Image: %dx%d\n", ImgWidth, ImgHeight);
 148
 149    glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0,
 150                 GL_YCBCR_MESA, ImgWidth, ImgHeight, 0,
 151                 GL_YCBCR_MESA, GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);
 152
 153    assert(glGetError() == GL_NO_ERROR);
 154    glTexSubImage2D(GL_TEXTURE_RECTANGLE_NV, 0,
 155                    0, 0, ImgWidth, ImgHeight,
 156                    GL_YCBCR_MESA, GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);
 157
 158    assert(glGetError() == GL_NO_ERROR);
 159
 160    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 161
 162    glEnable(GL_TEXTURE_RECTANGLE_NV);
 163
 164    glShadeModel(GL_FLAT);
 165    glClearColor(0.3, 0.3, 0.4, 1.0);
 166
 167    if (argc > 1 && strcmp(argv[1], "-info")==0) {
 168       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 169       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 170       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 171       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 172    }
 173 }
 174
 175
 176 int main( int argc, char *argv[] )
 177 {
 178    glutInit( &argc, argv );
 179    glutInitWindowSize( 300, 300 );
 180    glutInitWindowPosition( 0, 0 );
 181    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 182    glutCreateWindow(argv[0] );
 183
 184    Init( argc, argv );
 185
 186    glutReshapeFunc( Reshape );
 187    glutKeyboardFunc( Key );
 188    glutSpecialFunc( SpecialKey );
 189    glutDisplayFunc( Display );
 190
 191    glutMainLoop();
 192    return 0;
 193 }