Commit f98921d3 authored by Brian Paul's avatar Brian Paul
Browse files

display both YCbCr and RGB image (Ian)

parent 785774de
......@@ -19,6 +19,9 @@
static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
static GLint ImgWidth, ImgHeight;
static GLushort *ImageYUV = NULL;
static GLubyte *ImageRGB = NULL;
static const GLuint yuvObj = 100;
static const GLuint rgbObj = 101;
static void DrawObject(void)
......@@ -46,9 +49,20 @@ static void Display( void )
glClear( GL_COLOR_BUFFER_BIT );
glPushMatrix();
glTranslatef( -1.1, 0.0, -15.0 );
glRotatef(Xrot, 1.0, 0.0, 0.0);
glRotatef(Yrot, 0.0, 1.0, 0.0);
glRotatef(Zrot, 0.0, 0.0, 1.0);
glBindTexture(GL_TEXTURE_2D, yuvObj);
DrawObject();
glPopMatrix();
glPushMatrix();
glTranslatef( 1.1, 0.0, -15.0 );
glRotatef(Xrot, 1.0, 0.0, 0.0);
glRotatef(Yrot, 0.0, 1.0, 0.0);
glRotatef(Zrot, 0.0, 0.0, 1.0);
glBindTexture(GL_TEXTURE_2D, rgbObj);
DrawObject();
glPopMatrix();
......@@ -61,7 +75,7 @@ static void Reshape( int width, int height )
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
glFrustum( -1.1, 1.1, -1.1, 1.1, 10.0, 100.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( 0.0, 0.0, -15.0 );
......@@ -113,9 +127,9 @@ static void SpecialKey( int key, int x, int y )
static void Init( int argc, char *argv[] )
{
GLuint texObj = 100;
const char *file;
int error;
GLenum format;
if (!glutExtensionSupported("GL_MESA_ycbcr_texture")) {
printf("Sorry, GL_MESA_ycbcr_texture is required\n");
......@@ -124,15 +138,18 @@ static void Init( int argc, char *argv[] )
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glBindTexture(GL_TEXTURE_2D, texObj);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
if (argc > 1)
file = argv[1];
else
file = TEXTURE_FILE;
/* First load the texture as YCbCr.
*/
glBindTexture(GL_TEXTURE_2D, yuvObj);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
ImageYUV = LoadYUVImage(file, &ImgWidth, &ImgHeight );
if (!ImageYUV) {
printf("Couldn't read %s\n", TEXTURE_FILE);
......@@ -152,6 +169,35 @@ static void Init( int argc, char *argv[] )
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
/* Now load the texture as RGB.
*/
glBindTexture(GL_TEXTURE_2D, rgbObj);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
ImageRGB = LoadRGBImage(file, &ImgWidth, &ImgHeight, &format );
if (!ImageRGB) {
printf("Couldn't read %s\n", TEXTURE_FILE);
exit(0);
}
printf("Image: %dx%d\n", ImgWidth, ImgHeight);
glTexImage2D(GL_TEXTURE_2D, 0,
format,
ImgWidth, ImgHeight, 0,
format,
GL_UNSIGNED_BYTE, ImageRGB);
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glShadeModel(GL_FLAT);
glClearColor(0.3, 0.3, 0.4, 1.0);
......@@ -162,6 +208,8 @@ static void Init( int argc, char *argv[] )
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
}
printf( "Both images should appear the same.\n" );
}
......
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