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kolibrios-fun/contrib/sdk/samples/Mesa/readtex.c
Sergey Semyonov (Serge) 754f9336f0 upload sdk 
git-svn-id: svn://kolibrios.org@4349 a494cfbc-eb01-0410-851d-a64ba20cac60
2013-12-15 08:09:20 +00:00

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/* readtex.c */
/*
* Read an SGI .rgb image file and generate a mipmap texture set.
* Much of this code was borrowed from SGI's tk OpenGL toolkit.
*/
#include <GL/gl.h>
#include <GL/glu.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "readtex.h"
#ifndef SEEK_SET
# define SEEK_SET 0
#endif
/*
** RGB Image Structure
*/
typedef struct _TK_RGBImageRec {
GLint sizeX, sizeY;
GLint components;
unsigned char *data;
} TK_RGBImageRec;
/******************************************************************************/
typedef struct _rawImageRec {
unsigned short imagic;
unsigned short type;
unsigned short dim;
unsigned short sizeX, sizeY, sizeZ;
unsigned long min, max;
unsigned long wasteBytes;
char name[80];
unsigned long colorMap;
FILE *file;
unsigned char *tmp, *tmpR, *tmpG, *tmpB, *tmpA;
unsigned long rleEnd;
GLuint *rowStart;
GLint *rowSize;
} rawImageRec;
/******************************************************************************/
static void ConvertShort(unsigned short *array, long length)
{
unsigned long b1, b2;
unsigned char *ptr;
ptr = (unsigned char *)array;
while (length--) {
b1 = *ptr++;
b2 = *ptr++;
*array++ = (unsigned short) ((b1 << 8) | (b2));
}
}
static void ConvertLong(GLuint *array, long length)
{
unsigned long b1, b2, b3, b4;
unsigned char *ptr;
ptr = (unsigned char *)array;
while (length--) {
b1 = *ptr++;
b2 = *ptr++;
b3 = *ptr++;
b4 = *ptr++;
*array++ = (b1 << 24) | (b2 << 16) | (b3 << 8) | (b4);
}
}
static rawImageRec *RawImageOpen(const char *fileName)
{
union {
int testWord;
char testByte[4];
} endianTest;
rawImageRec *raw;
GLenum swapFlag;
int x;
size_t result;
endianTest.testWord = 1;
if (endianTest.testByte[0] == 1) {
swapFlag = GL_TRUE;
} else {
swapFlag = GL_FALSE;
}
raw = (rawImageRec *)calloc(1, sizeof(rawImageRec));
if (raw == NULL) {
fprintf(stderr, "Out of memory!\n");
return NULL;
}
raw->file = fopen(fileName, "rb");
if (raw->file == NULL) {
const char *baseName = strrchr(fileName, '/');
if(baseName)
raw->file = fopen(baseName + 1, "rb");
if(raw->file == NULL) {
free(raw);
return NULL;
}
}
result = fread(raw, 1, 12, raw->file);
assert(result == 12);
if (swapFlag) {
ConvertShort(&raw->imagic, 1);
ConvertShort(&raw->type, 1);
ConvertShort(&raw->dim, 1);
ConvertShort(&raw->sizeX, 1);
ConvertShort(&raw->sizeY, 1);
ConvertShort(&raw->sizeZ, 1);
}
raw->tmp = (unsigned char *)malloc(raw->sizeX*256);
raw->tmpR = (unsigned char *)malloc(raw->sizeX*256);
raw->tmpG = (unsigned char *)malloc(raw->sizeX*256);
raw->tmpB = (unsigned char *)malloc(raw->sizeX*256);
if (raw->sizeZ==4) {
raw->tmpA = (unsigned char *)malloc(raw->sizeX*256);
}
if (raw->tmp == NULL || raw->tmpR == NULL || raw->tmpG == NULL ||
raw->tmpB == NULL) {
fprintf(stderr, "Out of memory!\n");
free(raw->tmp);
free(raw->tmpR);
free(raw->tmpG);
free(raw->tmpB);
free(raw->tmpA);
free(raw);
return NULL;
}
if ((raw->type & 0xFF00) == 0x0100) {
x = raw->sizeY * raw->sizeZ * sizeof(GLuint);
raw->rowStart = (GLuint *)malloc(x);
raw->rowSize = (GLint *)malloc(x);
if (raw->rowStart == NULL || raw->rowSize == NULL) {
fprintf(stderr, "Out of memory!\n");
free(raw->tmp);
free(raw->tmpR);
free(raw->tmpG);
free(raw->tmpB);
free(raw->tmpA);
free(raw->rowStart);
free(raw->rowSize);
free(raw);
return NULL;
}
raw->rleEnd = 512 + (2 * x);
fseek(raw->file, 512, SEEK_SET);
result = fread(raw->rowStart, 1, x, raw->file);
assert(result == x);
result = fread(raw->rowSize, 1, x, raw->file);
assert(result == x);
if (swapFlag) {
ConvertLong(raw->rowStart, (long) (x/sizeof(GLuint)));
ConvertLong((GLuint *)raw->rowSize, (long) (x/sizeof(GLint)));
}
}
return raw;
}
static void RawImageClose(rawImageRec *raw)
{
fclose(raw->file);
free(raw->tmp);
free(raw->tmpR);
free(raw->tmpG);
free(raw->tmpB);
if (raw->rowStart)
free(raw->rowStart);
if (raw->rowSize)
free(raw->rowSize);
if (raw->sizeZ>3) {
free(raw->tmpA);
}
free(raw);
}
static void RawImageGetRow(rawImageRec *raw, unsigned char *buf, int y, int z)
{
unsigned char *iPtr, *oPtr, pixel;
int count, done = 0;
size_t result;
if ((raw->type & 0xFF00) == 0x0100) {
fseek(raw->file, (long) raw->rowStart[y+z*raw->sizeY], SEEK_SET);
result = fread(raw->tmp, 1, (unsigned int)raw->rowSize[y+z*raw->sizeY],
raw->file);
assert(result == (unsigned int)raw->rowSize[y+z*raw->sizeY]);
iPtr = raw->tmp;
oPtr = buf;
while (!done) {
pixel = *iPtr++;
count = (int)(pixel & 0x7F);
if (!count) {
done = 1;
return;
}
if (pixel & 0x80) {
while (count--) {
*oPtr++ = *iPtr++;
}
} else {
pixel = *iPtr++;
while (count--) {
*oPtr++ = pixel;
}
}
}
} else {
fseek(raw->file, 512+(y*raw->sizeX)+(z*raw->sizeX*raw->sizeY),
SEEK_SET);
result = fread(buf, 1, raw->sizeX, raw->file);
assert(result == raw->sizeX);
}
}
static void RawImageGetData(rawImageRec *raw, TK_RGBImageRec *final)
{
unsigned char *ptr;
int i, j;
final->data = (unsigned char *)malloc((raw->sizeX+1)*(raw->sizeY+1)*4);
if (final->data == NULL) {
fprintf(stderr, "Out of memory!\n");
return;
}
ptr = final->data;
for (i = 0; i < (int)(raw->sizeY); i++) {
RawImageGetRow(raw, raw->tmpR, i, 0);
RawImageGetRow(raw, raw->tmpG, i, 1);
RawImageGetRow(raw, raw->tmpB, i, 2);
if (raw->sizeZ>3) {
RawImageGetRow(raw, raw->tmpA, i, 3);
}
for (j = 0; j < (int)(raw->sizeX); j++) {
*ptr++ = *(raw->tmpR + j);
*ptr++ = *(raw->tmpG + j);
*ptr++ = *(raw->tmpB + j);
if (raw->sizeZ>3) {
*ptr++ = *(raw->tmpA + j);
}
}
}
}
static TK_RGBImageRec *tkRGBImageLoad(const char *fileName)
{
rawImageRec *raw;
TK_RGBImageRec *final;
raw = RawImageOpen(fileName);
if (!raw) {
fprintf(stderr, "File not found\n");
return NULL;
}
final = (TK_RGBImageRec *)malloc(sizeof(TK_RGBImageRec));
if (final == NULL) {
fprintf(stderr, "Out of memory!\n");
RawImageClose(raw);
return NULL;
}
final->sizeX = raw->sizeX;
final->sizeY = raw->sizeY;
final->components = raw->sizeZ;
RawImageGetData(raw, final);
RawImageClose(raw);
return final;
}
static void FreeImage( TK_RGBImageRec *image )
{
free(image->data);
free(image);
}
/*
* Load an SGI .rgb file and generate a set of 2-D mipmaps from it.
* Input: imageFile - name of .rgb to read
* intFormat - internal texture format to use, or number of components
* Return: GL_TRUE if success, GL_FALSE if error.
*/
GLboolean LoadRGBMipmaps( const char *imageFile, GLint intFormat )
{
GLint w, h;
return LoadRGBMipmaps2( imageFile, GL_TEXTURE_2D, intFormat, &w, &h );
}
GLboolean LoadRGBMipmaps2( const char *imageFile, GLenum target,
GLint intFormat, GLint *width, GLint *height )
{
GLint error;
GLenum format;
TK_RGBImageRec *image;
image = tkRGBImageLoad( imageFile );
if (!image) {
return GL_FALSE;
}
if (image->components==3) {
format = GL_RGB;
}
else if (image->components==4) {
format = GL_RGBA;
}
else {
/* not implemented */
fprintf(stderr,
"Error in LoadRGBMipmaps %d-component images not implemented\n",
image->components );
FreeImage(image);
return GL_FALSE;
}
error = gluBuild2DMipmaps( target,
intFormat,
image->sizeX, image->sizeY,
format,
GL_UNSIGNED_BYTE,
image->data );
*width = image->sizeX;
*height = image->sizeY;
FreeImage(image);
return error ? GL_FALSE : GL_TRUE;
}
/*
* 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
*/
GLubyte *LoadRGBImage( const char *imageFile, GLint *width, GLint *height,
GLenum *format )
{
TK_RGBImageRec *image;
GLint bytes;
GLubyte *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 LoadRGBImage %d-component images not implemented\n",
image->components );
FreeImage(image);
return NULL;
}
*width = image->sizeX;
*height = image->sizeY;
bytes = image->sizeX * image->sizeY * image->components;
buffer = (GLubyte *) malloc(bytes);
if (!buffer) {
FreeImage(image);
return NULL;
}
memcpy( (void *) buffer, (void *) image->data, bytes );
FreeImage(image);
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;
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 );
FreeImage(image);
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;
}
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