Commit 27358a24 authored by Keith Whitwell's avatar Keith Whitwell
Browse files

move LoadYUVImage into readtex.c

parent eea72ff7
......@@ -28,7 +28,9 @@ PROGS = antialias \
vptest2 \
vptest3 \
vptorus \
vpwarpmesh
vpwarpmesh \
yuvrect \
yuvsquare
##### RULES #####
......
/* $Id: texrect.c,v 1.2 2002/10/15 14:43:55 brianp Exp $ */
/* $Id: texrect.c,v 1.3 2003/05/20 09:54:58 keithw Exp $ */
/* GL_NV_texture_rectangle test
*
......@@ -14,8 +14,6 @@
#include <string.h>
#include <GL/glut.h>
#include "readtex.c" /* I know, this is a hack. */
#define TEXTURE_0_FILE "../images/girl.rgb"
#define TEXTURE_1_FILE "../images/reflect.rgb"
......
......@@ -19,7 +19,6 @@
static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
static GLint ImgWidth, ImgHeight;
static GLenum ImgFormat;
static GLubyte *Image = NULL;
static GLushort *ImageYUV = NULL;
......@@ -107,42 +106,6 @@ static void SpecialKey( int key, int x, int y )
}
#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[] )
{
......@@ -176,16 +139,14 @@ static void Init( int argc, char *argv[] )
else
file = TEXTURE_FILE;
Image = LoadRGBImage(file, &ImgWidth, &ImgHeight, &ImgFormat);
if (!Image) {
ImageYUV = LoadYUVImage(file, &ImgWidth, &ImgHeight);
if (!ImageYUV) {
printf("Couldn't read %s\n", TEXTURE_FILE);
exit(0);
}
printf("Image: %dx%d\n", ImgWidth, ImgHeight);
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);
......
......@@ -18,7 +18,6 @@
static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
static GLint ImgWidth, ImgHeight;
static GLenum ImgFormat;
static GLushort *ImageYUV = NULL;
......@@ -108,94 +107,6 @@ static void SpecialKey( int key, int x, int y )
#define CLAMP( X, MIN, MAX ) ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
static void ConvertRGBtoYUV(GLint w, GLint h, GLint texel_bytes,
const GLubyte *src,
GLushort *dest)
{
GLint i, j;
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
const GLfloat r = (src[0]) / 255.0;
const GLfloat g = (src[1]) / 255.0;
const GLfloat b = (src[2]) / 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++;
src += texel_bytes;
}
}
}
/*
* Load an SGI .rgb file and return a pointer to the image data.
* Input: imageFile - name of .rgb to read
* Output: width - width of image
* height - height of image
* format - format of image (GL_RGB or GL_RGBA)
* Return: pointer to image data or NULL if error
*/
GLushort *LoadYUVImage( const char *imageFile, GLint *width, GLint *height,
GLenum *format )
{
TK_RGBImageRec *image;
GLint bytes;
GLushort *buffer;
image = tkRGBImageLoad( imageFile );
if (!image) {
return NULL;
}
if (image->components==3) {
*format = GL_RGB;
}
else if (image->components==4) {
*format = GL_RGBA;
}
else {
/* not implemented */
fprintf(stderr,
"Error in LoadYUVImage %d-component images not implemented\n",
image->components );
return NULL;
}
*width = image->sizeX;
*height = image->sizeY;
buffer = (GLushort *) malloc( image->sizeX * image->sizeY * 2 );
if (buffer)
ConvertRGBtoYUV( image->sizeX,
image->sizeY,
image->components,
image->data,
buffer );
FreeImage(image);
return buffer;
}
/* #define LINEAR_FILTER */
......@@ -222,7 +133,7 @@ static void Init( int argc, char *argv[] )
else
file = TEXTURE_FILE;
ImageYUV = LoadYUVImage(file, &ImgWidth, &ImgHeight, &ImgFormat);
ImageYUV = LoadYUVImage(file, &ImgWidth, &ImgHeight );
if (!ImageYUV) {
printf("Couldn't read %s\n", TEXTURE_FILE);
exit(0);
......@@ -230,28 +141,12 @@ static void Init( int argc, char *argv[] )
printf("Image: %dx%d\n", ImgWidth, ImgHeight);
/* error = gluBuild2DMipmaps( GL_TEXTURE_2D, */
/* GL_YCBCR_MESA, */
/* ImgWidth, ImgHeight, */
/* GL_YCBCR_MESA, */
/* GL_UNSIGNED_SHORT_8_8_MESA, */
/* ImageYUV ); */
#if 0
glTexImage2D(GL_TEXTURE_2D, 0,
GL_RGB,
ImgWidth, ImgHeight, 0,
GL_RGB,
GL_UNSIGNED_SHORT_5_6_5, ImageYUV);
#else
glTexImage2D(GL_TEXTURE_2D, 0,
GL_YCBCR_MESA,
ImgWidth, ImgHeight, 0,
GL_YCBCR_MESA,
GL_UNSIGNED_SHORT_8_8_MESA, ImageYUV);
#endif
glEnable(GL_TEXTURE_2D);
......
......@@ -365,3 +365,88 @@ GLubyte *LoadRGBImage( const char *imageFile, GLint *width, GLint *height,
return buffer;
}
#define CLAMP( X, MIN, MAX ) ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
static void ConvertRGBtoYUV(GLint w, GLint h, GLint texel_bytes,
const GLubyte *src,
GLushort *dest)
{
GLint i, j;
for (i = 0; i < h; i++) {
for (j = 0; j < w; j++) {
const GLfloat r = (src[0]) / 255.0;
const GLfloat g = (src[1]) / 255.0;
const GLfloat b = (src[2]) / 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++;
src += texel_bytes;
}
}
}
/*
* Load an SGI .rgb file and return a pointer to the image data, converted
* to 422 yuv.
*
* Input: imageFile - name of .rgb to read
* Output: width - width of image
* height - height of image
* Return: pointer to image data or NULL if error
*/
GLushort *LoadYUVImage( const char *imageFile, GLint *width, GLint *height )
{
TK_RGBImageRec *image;
GLint bytes;
GLushort *buffer;
image = tkRGBImageLoad( imageFile );
if (!image) {
return NULL;
}
if (image->components != 3 && image->components !=4 ) {
/* not implemented */
fprintf(stderr,
"Error in LoadYUVImage %d-component images not implemented\n",
image->components );
return NULL;
}
*width = image->sizeX;
*height = image->sizeY;
buffer = (GLushort *) malloc( image->sizeX * image->sizeY * 2 );
if (buffer)
ConvertRGBtoYUV( image->sizeX,
image->sizeY,
image->components,
image->data,
buffer );
FreeImage(image);
return buffer;
}
......@@ -20,5 +20,7 @@ extern GLubyte *
LoadRGBImage( const char *imageFile,
GLint *width, GLint *height, GLenum *format );
extern GLushort *
LoadYUVImage( const char *imageFile, GLint *width, GLint *height );
#endif
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