progs/tests/yuvsquare.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
   8 #include <math.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <GL/glew.h>
  13 #include <GL/glut.h>
  14
  15 #include "../util/readtex.c"   /* I know, this is a hack. */
  16
  17 #define TEXTURE_FILE "../images/tile.rgb"
  18
  19 static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
  20 static GLint ImgWidth, ImgHeight;
  21 static GLushort *ImageYUV = NULL;
  22 static GLubyte *ImageRGB = NULL;
  23 static const GLuint yuvObj = 100;
  24 static const GLuint rgbObj = 101;
  25
  26
  27 static void DrawObject(void)
  28 {
  29    glBegin(GL_QUADS);
  30
  31    glTexCoord2f(0, 0);
  32    glVertex2f(-1.0, -1.0);
  33
  34    glTexCoord2f(1, 0);
  35    glVertex2f(1.0, -1.0);
  36
  37    glTexCoord2f(1, 1);
  38    glVertex2f(1.0, 1.0);
  39
  40    glTexCoord2f(0, 1);
  41    glVertex2f(-1.0, 1.0);
  42
  43    glEnd();
  44 }
  45
  46
  47 static void Display( void )
  48 {
  49    glClear( GL_COLOR_BUFFER_BIT );
  50
  51    glPushMatrix();
  52       glTranslatef( -1.1, 0.0, -15.0 );
  53       glRotatef(Xrot, 1.0, 0.0, 0.0);
  54       glRotatef(Yrot, 0.0, 1.0, 0.0);
  55       glRotatef(Zrot, 0.0, 0.0, 1.0);
  56       glBindTexture(GL_TEXTURE_2D, yuvObj);
  57       DrawObject();
  58    glPopMatrix();
  59
  60    glPushMatrix();
  61       glTranslatef(  1.1, 0.0, -15.0 );
  62       glRotatef(Xrot, 1.0, 0.0, 0.0);
  63       glRotatef(Yrot, 0.0, 1.0, 0.0);
  64       glRotatef(Zrot, 0.0, 0.0, 1.0);
  65       glBindTexture(GL_TEXTURE_2D, rgbObj);
  66       DrawObject();
  67    glPopMatrix();
  68
  69    glutSwapBuffers();
  70 }
  71
  72
  73 static void Reshape( int width, int height )
  74 {
  75    glViewport( 0, 0, width, height );
  76    glMatrixMode( GL_PROJECTION );
  77    glLoadIdentity();
  78    glFrustum( -1.1, 1.1, -1.1, 1.1, 10.0, 100.0 );
  79    glMatrixMode( GL_MODELVIEW );
  80    glLoadIdentity();
  81    glTranslatef( 0.0, 0.0, -15.0 );
  82 }
  83
  84
  85 static void Key( unsigned char key, int x, int y )
  86 {
  87    (void) x;
  88    (void) y;
  89    switch (key) {
  90       case 27:
  91          exit(0);
  92          break;
  93    }
  94    glutPostRedisplay();
  95 }
  96
  97
  98 static void SpecialKey( int key, int x, int y )
  99 {
 100    float step = 3.0;
 101    (void) x;
 102    (void) y;
 103
 104    switch (key) {
 105       case GLUT_KEY_UP:
 106          Xrot += step;
 107          break;
 108       case GLUT_KEY_DOWN:
 109          Xrot -= step;
 110          break;
 111       case GLUT_KEY_LEFT:
 112          Yrot += step;
 113          break;
 114       case GLUT_KEY_RIGHT:
 115          Yrot -= step;
 116          break;
 117    }
 118    glutPostRedisplay();
 119 }
 120
 121
 122 #define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
 123
 124
 125
 126 /* #define LINEAR_FILTER */
 127
 128 static void Init( int argc, char *argv[] )
 129 {
 130    const char *file;
 131    GLenum  format;
 132
 133    if (!glutExtensionSupported("GL_MESA_ycbcr_texture")) {
 134       printf("Sorry, GL_MESA_ycbcr_texture is required\n");
 135       exit(0);
 136    }
 137
 138    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 139
 140    if (argc > 1)
 141       file = argv[1];
 142    else
 143       file = TEXTURE_FILE;
 144
 145    /* First load the texture as YCbCr.
 146     */
 147
 148    glBindTexture(GL_TEXTURE_2D, yuvObj);
 149    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 150    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 151
 152    ImageYUV = LoadYUVImage(file, &ImgWidth, &ImgHeight );
 153    if (!ImageYUV) {
 154       printf("Couldn't read %s\n", TEXTURE_FILE);
 155       exit(0);
 156    }
 157
 158    printf("Image: %dx%d\n", ImgWidth, ImgHeight);
 159
 160
 161    glTexImage2D(GL_TEXTURE_2D, 0,
 162                 GL_YCBCR_MESA,
 163                 ImgWidth, ImgHeight, 0,
 164                 GL_YCBCR_MESA,
 165                 GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);
 166
 167    glEnable(GL_TEXTURE_2D);
 168
 169    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 170
 171
 172
 173    /* Now load the texture as RGB.
 174     */
 175
 176    glBindTexture(GL_TEXTURE_2D, rgbObj);
 177    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 178    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 179
 180    ImageRGB = LoadRGBImage(file, &ImgWidth, &ImgHeight, &format );
 181    if (!ImageRGB) {
 182       printf("Couldn't read %s\n", TEXTURE_FILE);
 183       exit(0);
 184    }
 185
 186    printf("Image: %dx%d\n", ImgWidth, ImgHeight);
 187
 188
 189    glTexImage2D(GL_TEXTURE_2D, 0,
 190                 format,
 191                 ImgWidth, ImgHeight, 0,
 192                 format,
 193                 GL_UNSIGNED_BYTE, ImageRGB);
 194
 195    glEnable(GL_TEXTURE_2D);
 196
 197    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 198
 199
 200
 201    glShadeModel(GL_FLAT);
 202    glClearColor(0.3, 0.3, 0.4, 1.0);
 203
 204    if (argc > 1 && strcmp(argv[1], "-info")==0) {
 205       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 206       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 207       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 208       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 209    }
 210
 211    printf( "Both images should appear the same.\n" );
 212 }
 213
 214
 215 int main( int argc, char *argv[] )
 216 {
 217    glutInit( &argc, argv );
 218    glutInitWindowSize( 300, 300 );
 219    glutInitWindowPosition( 0, 0 );
 220    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 221    glutCreateWindow(argv[0] );
 222    glewInit();
 223
 224    Init( argc, argv );
 225
 226    glutReshapeFunc( Reshape );
 227    glutKeyboardFunc( Key );
 228    glutSpecialFunc( SpecialKey );
 229    glutDisplayFunc( Display );
 230
 231    glutMainLoop();
 232    return 0;
 233 }