Commit b5d83f2e authored by Keith Whitwell's avatar Keith Whitwell
Browse files

move LoadYUVImage into readtex.c

parent 1703cd21
/*
* Test the GL_NV_texture_rectangle and GL_MESA_ycrcb_texture extensions.
*
* Brian Paul 13 September 2002
*/
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define GL_GLEXT_PROTOTYPES
#include <GL/glut.h>
#include "readtex.c" /* I know, this is a hack. */
#define TEXTURE_FILE "../images/girl.rgb"
static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
static GLint ImgWidth, ImgHeight;
static GLenum ImgFormat;
static GLubyte *Image = NULL;
static GLushort *ImageYUV = NULL;
static void DrawObject(void)
{
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex2f(-1.0, -1.0);
glTexCoord2f(ImgWidth, 0);
glVertex2f(1.0, -1.0);
glTexCoord2f(ImgWidth, ImgHeight);
glVertex2f(1.0, 1.0);
glTexCoord2f(0, ImgHeight);
glVertex2f(-1.0, 1.0);
glEnd();
}
static void Display( void )
{
glClear( GL_COLOR_BUFFER_BIT );
glPushMatrix();
glRotatef(Xrot, 1.0, 0.0, 0.0);
glRotatef(Yrot, 0.0, 1.0, 0.0);
glRotatef(Zrot, 0.0, 0.0, 1.0);
DrawObject();
glPopMatrix();
glutSwapBuffers();
}
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 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( 0.0, 0.0, -15.0 );
}
static void Key( unsigned char key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case 27:
exit(0);
break;
}
glutPostRedisplay();
}
static void SpecialKey( int key, int x, int y )
{
float step = 3.0;
(void) x;
(void) y;
switch (key) {
case GLUT_KEY_UP:
Xrot += step;
break;
case GLUT_KEY_DOWN:
Xrot -= step;
break;
case GLUT_KEY_LEFT:
Yrot += step;
break;
case GLUT_KEY_RIGHT:
Yrot -= step;
break;
}
glutPostRedisplay();
}
#define CLAMP( X, MIN, MAX ) ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
static void ConvertRGBtoYUV(GLint w, GLint h, const GLubyte *src,
GLushort *dest)
{
GLint i, j;
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
const GLfloat r = (*src++) / 255.0;
const GLfloat g = (*src++) / 255.0;
const GLfloat b = (*src++) / 255.0;
GLfloat y, cr, cb;
GLint iy, icr, icb;
y = r * 65.481 + g * 128.553 + b * 24.966 + 16;
cb = r * -37.797 + g * -74.203 + b * 112.0 + 128;
cr = r * 112.0 + g * -93.786 + b * -18.214 + 128;
/*printf("%f %f %f -> %f %f %f\n", r, g, b, y, cb, cr);*/
iy = (GLint) CLAMP(y, 0, 254);
icb = (GLint) CLAMP(cb, 0, 254);
icr = (GLint) CLAMP(cr, 0, 254);
if (j & 1) {
/* odd */
*dest = (iy << 8) | icr;
}
else {
/* even */
*dest = (iy << 8) | icb;
}
dest++;
}
}
}
static void Init( int argc, char *argv[] )
{
GLuint texObj = 100;
const char *file;
if (!glutExtensionSupported("GL_NV_texture_rectangle")) {
printf("Sorry, GL_NV_texture_rectangle is required\n");
exit(0);
}
if (!glutExtensionSupported("GL_MESA_ycbcr_texture")) {
printf("Sorry, GL_MESA_ycbcr_texture is required\n");
exit(0);
}
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glBindTexture(GL_TEXTURE_RECTANGLE_NV, texObj);
#ifdef LINEAR_FILTER
/* linear filtering looks much nicer but is much slower for Mesa */
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
#else
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
#endif
if (argc > 1)
file = argv[1];
else
file = TEXTURE_FILE;
Image = LoadRGBImage(file, &ImgWidth, &ImgHeight, &ImgFormat);
if (!Image) {
printf("Couldn't read %s\n", TEXTURE_FILE);
exit(0);
}
#if 0
glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0,
GL_RGB, ImgWidth, ImgHeight, 0,
ImgFormat, GL_UNSIGNED_BYTE, Image);
#else
ImageYUV = (GLushort *) malloc(ImgWidth * ImgHeight * sizeof(GLushort));
ConvertRGBtoYUV(ImgWidth, ImgHeight, Image, ImageYUV);
glTexImage2D(GL_TEXTURE_RECTANGLE_NV, 0,
GL_YCBCR_MESA, ImgWidth, ImgHeight, 0,
GL_YCBCR_MESA, GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);
assert(glGetError() == GL_NO_ERROR);
glTexSubImage2D(GL_TEXTURE_RECTANGLE_NV, 0,
0, 0, ImgWidth, ImgHeight,
GL_YCBCR_MESA, GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);
assert(glGetError() == GL_NO_ERROR);
#endif
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glEnable(GL_TEXTURE_RECTANGLE_NV);
glShadeModel(GL_FLAT);
glClearColor(0.3, 0.3, 0.4, 1.0);
if (argc > 1 && strcmp(argv[1], "-info")==0) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
}
}
int main( int argc, char *argv[] )
{
glutInit( &argc, argv );
glutInitWindowSize( 300, 300 );
glutInitWindowPosition( 0, 0 );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
glutCreateWindow(argv[0] );
Init( argc, argv );
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutSpecialFunc( SpecialKey );
glutDisplayFunc( Display );
glutMainLoop();
return 0;
}
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