progs/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 GLenum ImgFormat;
  22 static GLushort *ImageYUV = NULL;
  23
  24
  25 static void DrawObject(void)
  26 {
  27    glBegin(GL_QUADS);
  28
  29    glTexCoord2f(0, 0);
  30    glVertex2f(-1.0, -1.0);
  31
  32    glTexCoord2f(ImgWidth, 0);
  33    glVertex2f(1.0, -1.0);
  34
  35    glTexCoord2f(ImgWidth, ImgHeight);
  36    glVertex2f(1.0, 1.0);
  37
  38    glTexCoord2f(0, ImgHeight);
  39    glVertex2f(-1.0, 1.0);
  40
  41    glEnd();
  42 }
  43
  44
  45 static void Display( void )
  46 {
  47    glClear( GL_COLOR_BUFFER_BIT );
  48
  49    glPushMatrix();
  50       glRotatef(Xrot, 1.0, 0.0, 0.0);
  51       glRotatef(Yrot, 0.0, 1.0, 0.0);
  52       glRotatef(Zrot, 0.0, 0.0, 1.0);
  53       DrawObject();
  54    glPopMatrix();
  55
  56    glutSwapBuffers();
  57 }
  58
  59
  60 static void Reshape( int width, int height )
  61 {
  62    glViewport( 0, 0, width, height );
  63    glMatrixMode( GL_PROJECTION );
  64    glLoadIdentity();
  65    glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
  66    glMatrixMode( GL_MODELVIEW );
  67    glLoadIdentity();
  68    glTranslatef( 0.0, 0.0, -15.0 );
  69 }
  70
  71
  72 static void Key( unsigned char key, int x, int y )
  73 {
  74    (void) x;
  75    (void) y;
  76    switch (key) {
  77       case 27:
  78          exit(0);
  79          break;
  80    }
  81    glutPostRedisplay();
  82 }
  83
  84
  85 static void SpecialKey( int key, int x, int y )
  86 {
  87    float step = 3.0;
  88    (void) x;
  89    (void) y;
  90
  91    switch (key) {
  92       case GLUT_KEY_UP:
  93          Xrot += step;
  94          break;
  95       case GLUT_KEY_DOWN:
  96          Xrot -= step;
  97          break;
  98       case GLUT_KEY_LEFT:
  99          Yrot += step;
 100          break;
 101       case GLUT_KEY_RIGHT:
 102          Yrot -= step;
 103          break;
 104    }
 105    glutPostRedisplay();
 106 }
 107
 108
 109
 110 static void Init( int argc, char *argv[] )
 111 {
 112    GLuint texObj = 100;
 113    const char *file;
 114
 115    if (!glutExtensionSupported("GL_NV_texture_rectangle")) {
 116       printf("Sorry, GL_NV_texture_rectangle is required\n");
 117       exit(0);
 118    }
 119
 120    if (!glutExtensionSupported("GL_MESA_ycbcr_texture")) {
 121       printf("Sorry, GL_MESA_ycbcr_texture is required\n");
 122       exit(0);
 123    }
 124
 125    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 126
 127    glBindTexture(GL_TEXTURE_RECTANGLE_NV, texObj);
 128 #ifdef LINEAR_FILTER
 129    /* linear filtering looks much nicer but is much slower for Mesa */
 130    glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 131    glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 132 #else
 133    glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 134    glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 135 #endif
 136
 137    if (argc > 1)
 138       file = argv[1];
 139    else
 140       file = TEXTURE_FILE;
 141
 142    ImageYUV = LoadYUVImage(file, &ImgWidth, &ImgHeight);
 143    if (!ImageYUV) {
 144       printf("Couldn't read %s\n", TEXTURE_FILE);
 145       exit(0);
 146    }
 147
 148    printf("Image: %dx%d\n", ImgWidth, ImgHeight);
 149
 150    glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0,
 151                 GL_YCBCR_MESA, ImgWidth, ImgHeight, 0,
 152                 GL_YCBCR_MESA, GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);
 153
 154    assert(glGetError() == GL_NO_ERROR);
 155    glTexSubImage2D(GL_TEXTURE_RECTANGLE_NV, 0,
 156                    0, 0, ImgWidth, ImgHeight,
 157                    GL_YCBCR_MESA, GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);
 158
 159    assert(glGetError() == GL_NO_ERROR);
 160
 161    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 162
 163    glEnable(GL_TEXTURE_RECTANGLE_NV);
 164
 165    glShadeModel(GL_FLAT);
 166    glClearColor(0.3, 0.3, 0.4, 1.0);
 167
 168    if (argc > 1 && strcmp(argv[1], "-info")==0) {
 169       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 170       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 171       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 172       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 173    }
 174 }
 175
 176
 177 int main( int argc, char *argv[] )
 178 {
 179    glutInit( &argc, argv );
 180    glutInitWindowSize( 300, 300 );
 181    glutInitWindowPosition( 0, 0 );
 182    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 183    glutCreateWindow(argv[0] );
 184
 185    Init( argc, argv );
 186
 187    glutReshapeFunc( Reshape );
 188    glutKeyboardFunc( Key );
 189    glutSpecialFunc( SpecialKey );
 190    glutDisplayFunc( Display );
 191
 192    glutMainLoop();
 193    return 0;
 194 }