495 lines
12 KiB
C
495 lines
12 KiB
C
/* readtex.c */
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/*
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* Read an SGI .rgb image file and generate a mipmap texture set.
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* Much of this code was borrowed from SGI's tk OpenGL toolkit.
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*/
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "readtex.h"
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#ifndef SEEK_SET
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# define SEEK_SET 0
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#endif
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/*
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** RGB Image Structure
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*/
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typedef struct _TK_RGBImageRec {
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GLint sizeX, sizeY;
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GLint components;
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unsigned char *data;
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} TK_RGBImageRec;
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/******************************************************************************/
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typedef struct _rawImageRec {
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unsigned short imagic;
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unsigned short type;
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unsigned short dim;
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unsigned short sizeX, sizeY, sizeZ;
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unsigned long min, max;
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unsigned long wasteBytes;
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char name[80];
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unsigned long colorMap;
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FILE *file;
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unsigned char *tmp, *tmpR, *tmpG, *tmpB, *tmpA;
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unsigned long rleEnd;
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GLuint *rowStart;
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GLint *rowSize;
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} rawImageRec;
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/******************************************************************************/
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static void ConvertShort(unsigned short *array, long length)
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{
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unsigned long b1, b2;
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unsigned char *ptr;
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ptr = (unsigned char *)array;
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while (length--) {
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b1 = *ptr++;
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b2 = *ptr++;
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*array++ = (unsigned short) ((b1 << 8) | (b2));
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}
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}
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static void ConvertLong(GLuint *array, long length)
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{
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unsigned long b1, b2, b3, b4;
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unsigned char *ptr;
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ptr = (unsigned char *)array;
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while (length--) {
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b1 = *ptr++;
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b2 = *ptr++;
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b3 = *ptr++;
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b4 = *ptr++;
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*array++ = (b1 << 24) | (b2 << 16) | (b3 << 8) | (b4);
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}
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}
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static rawImageRec *RawImageOpen(const char *fileName)
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{
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union {
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int testWord;
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char testByte[4];
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} endianTest;
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rawImageRec *raw;
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GLenum swapFlag;
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int x;
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size_t result;
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endianTest.testWord = 1;
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if (endianTest.testByte[0] == 1) {
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swapFlag = GL_TRUE;
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} else {
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swapFlag = GL_FALSE;
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}
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raw = (rawImageRec *)calloc(1, sizeof(rawImageRec));
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if (raw == NULL) {
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fprintf(stderr, "Out of memory!\n");
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return NULL;
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}
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raw->file = fopen(fileName, "rb");
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if (raw->file == NULL) {
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const char *baseName = strrchr(fileName, '/');
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if(baseName)
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raw->file = fopen(baseName + 1, "rb");
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if(raw->file == NULL) {
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free(raw);
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return NULL;
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}
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}
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result = fread(raw, 1, 12, raw->file);
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assert(result == 12);
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if (swapFlag) {
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ConvertShort(&raw->imagic, 1);
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ConvertShort(&raw->type, 1);
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ConvertShort(&raw->dim, 1);
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ConvertShort(&raw->sizeX, 1);
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ConvertShort(&raw->sizeY, 1);
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ConvertShort(&raw->sizeZ, 1);
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}
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raw->tmp = (unsigned char *)malloc(raw->sizeX*256);
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raw->tmpR = (unsigned char *)malloc(raw->sizeX*256);
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raw->tmpG = (unsigned char *)malloc(raw->sizeX*256);
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raw->tmpB = (unsigned char *)malloc(raw->sizeX*256);
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if (raw->sizeZ==4) {
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raw->tmpA = (unsigned char *)malloc(raw->sizeX*256);
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}
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if (raw->tmp == NULL || raw->tmpR == NULL || raw->tmpG == NULL ||
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raw->tmpB == NULL) {
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fprintf(stderr, "Out of memory!\n");
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free(raw->tmp);
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free(raw->tmpR);
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free(raw->tmpG);
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free(raw->tmpB);
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free(raw->tmpA);
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free(raw);
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return NULL;
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}
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if ((raw->type & 0xFF00) == 0x0100) {
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x = raw->sizeY * raw->sizeZ * sizeof(GLuint);
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raw->rowStart = (GLuint *)malloc(x);
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raw->rowSize = (GLint *)malloc(x);
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if (raw->rowStart == NULL || raw->rowSize == NULL) {
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fprintf(stderr, "Out of memory!\n");
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free(raw->tmp);
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free(raw->tmpR);
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free(raw->tmpG);
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free(raw->tmpB);
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free(raw->tmpA);
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free(raw->rowStart);
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free(raw->rowSize);
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free(raw);
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return NULL;
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}
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raw->rleEnd = 512 + (2 * x);
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fseek(raw->file, 512, SEEK_SET);
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result = fread(raw->rowStart, 1, x, raw->file);
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assert(result == x);
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result = fread(raw->rowSize, 1, x, raw->file);
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assert(result == x);
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if (swapFlag) {
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ConvertLong(raw->rowStart, (long) (x/sizeof(GLuint)));
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ConvertLong((GLuint *)raw->rowSize, (long) (x/sizeof(GLint)));
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}
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}
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return raw;
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}
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static void RawImageClose(rawImageRec *raw)
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{
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fclose(raw->file);
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free(raw->tmp);
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free(raw->tmpR);
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free(raw->tmpG);
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free(raw->tmpB);
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if (raw->rowStart)
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free(raw->rowStart);
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if (raw->rowSize)
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free(raw->rowSize);
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if (raw->sizeZ>3) {
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free(raw->tmpA);
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}
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free(raw);
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}
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static void RawImageGetRow(rawImageRec *raw, unsigned char *buf, int y, int z)
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{
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unsigned char *iPtr, *oPtr, pixel;
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int count, done = 0;
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size_t result;
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if ((raw->type & 0xFF00) == 0x0100) {
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fseek(raw->file, (long) raw->rowStart[y+z*raw->sizeY], SEEK_SET);
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result = fread(raw->tmp, 1, (unsigned int)raw->rowSize[y+z*raw->sizeY],
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raw->file);
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assert(result == (unsigned int)raw->rowSize[y+z*raw->sizeY]);
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iPtr = raw->tmp;
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oPtr = buf;
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while (!done) {
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pixel = *iPtr++;
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count = (int)(pixel & 0x7F);
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if (!count) {
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done = 1;
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return;
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}
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if (pixel & 0x80) {
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while (count--) {
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*oPtr++ = *iPtr++;
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}
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} else {
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pixel = *iPtr++;
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while (count--) {
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*oPtr++ = pixel;
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}
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}
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}
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} else {
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fseek(raw->file, 512+(y*raw->sizeX)+(z*raw->sizeX*raw->sizeY),
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SEEK_SET);
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result = fread(buf, 1, raw->sizeX, raw->file);
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assert(result == raw->sizeX);
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}
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}
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static void RawImageGetData(rawImageRec *raw, TK_RGBImageRec *final)
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{
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unsigned char *ptr;
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int i, j;
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final->data = (unsigned char *)malloc((raw->sizeX+1)*(raw->sizeY+1)*4);
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if (final->data == NULL) {
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fprintf(stderr, "Out of memory!\n");
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return;
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}
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ptr = final->data;
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for (i = 0; i < (int)(raw->sizeY); i++) {
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RawImageGetRow(raw, raw->tmpR, i, 0);
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RawImageGetRow(raw, raw->tmpG, i, 1);
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RawImageGetRow(raw, raw->tmpB, i, 2);
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if (raw->sizeZ>3) {
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RawImageGetRow(raw, raw->tmpA, i, 3);
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}
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for (j = 0; j < (int)(raw->sizeX); j++) {
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*ptr++ = *(raw->tmpR + j);
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*ptr++ = *(raw->tmpG + j);
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*ptr++ = *(raw->tmpB + j);
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if (raw->sizeZ>3) {
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*ptr++ = *(raw->tmpA + j);
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}
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}
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}
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}
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static TK_RGBImageRec *tkRGBImageLoad(const char *fileName)
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{
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rawImageRec *raw;
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TK_RGBImageRec *final;
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raw = RawImageOpen(fileName);
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if (!raw) {
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fprintf(stderr, "File not found\n");
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return NULL;
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}
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final = (TK_RGBImageRec *)malloc(sizeof(TK_RGBImageRec));
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if (final == NULL) {
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fprintf(stderr, "Out of memory!\n");
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RawImageClose(raw);
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return NULL;
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}
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final->sizeX = raw->sizeX;
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final->sizeY = raw->sizeY;
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final->components = raw->sizeZ;
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RawImageGetData(raw, final);
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RawImageClose(raw);
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return final;
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}
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static void FreeImage( TK_RGBImageRec *image )
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{
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free(image->data);
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free(image);
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}
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/*
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* Load an SGI .rgb file and generate a set of 2-D mipmaps from it.
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* Input: imageFile - name of .rgb to read
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* intFormat - internal texture format to use, or number of components
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* Return: GL_TRUE if success, GL_FALSE if error.
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*/
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GLboolean LoadRGBMipmaps( const char *imageFile, GLint intFormat )
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{
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GLint w, h;
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return LoadRGBMipmaps2( imageFile, GL_TEXTURE_2D, intFormat, &w, &h );
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}
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GLboolean LoadRGBMipmaps2( const char *imageFile, GLenum target,
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GLint intFormat, GLint *width, GLint *height )
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{
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GLint error;
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GLenum format;
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TK_RGBImageRec *image;
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image = tkRGBImageLoad( imageFile );
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if (!image) {
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return GL_FALSE;
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}
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if (image->components==3) {
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format = GL_RGB;
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}
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else if (image->components==4) {
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format = GL_RGBA;
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}
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else {
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/* not implemented */
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fprintf(stderr,
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"Error in LoadRGBMipmaps %d-component images not implemented\n",
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image->components );
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FreeImage(image);
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return GL_FALSE;
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}
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error = gluBuild2DMipmaps( target,
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intFormat,
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image->sizeX, image->sizeY,
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format,
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GL_UNSIGNED_BYTE,
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image->data );
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*width = image->sizeX;
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*height = image->sizeY;
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FreeImage(image);
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return error ? GL_FALSE : GL_TRUE;
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}
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/*
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* Load an SGI .rgb file and return a pointer to the image data.
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* Input: imageFile - name of .rgb to read
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* Output: width - width of image
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* height - height of image
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* format - format of image (GL_RGB or GL_RGBA)
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* Return: pointer to image data or NULL if error
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*/
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GLubyte *LoadRGBImage( const char *imageFile, GLint *width, GLint *height,
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GLenum *format )
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{
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TK_RGBImageRec *image;
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GLint bytes;
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GLubyte *buffer;
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image = tkRGBImageLoad( imageFile );
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if (!image) {
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return NULL;
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}
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if (image->components==3) {
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*format = GL_RGB;
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}
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else if (image->components==4) {
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*format = GL_RGBA;
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}
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else {
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/* not implemented */
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fprintf(stderr,
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"Error in LoadRGBImage %d-component images not implemented\n",
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image->components );
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FreeImage(image);
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return NULL;
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}
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*width = image->sizeX;
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*height = image->sizeY;
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bytes = image->sizeX * image->sizeY * image->components;
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buffer = (GLubyte *) malloc(bytes);
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if (!buffer) {
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FreeImage(image);
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return NULL;
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}
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memcpy( (void *) buffer, (void *) image->data, bytes );
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FreeImage(image);
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return buffer;
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}
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#define CLAMP( X, MIN, MAX ) ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
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static void ConvertRGBtoYUV(GLint w, GLint h, GLint texel_bytes,
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const GLubyte *src,
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GLushort *dest)
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{
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GLint i, j;
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++) {
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const GLfloat r = (src[0]) / 255.0;
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const GLfloat g = (src[1]) / 255.0;
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const GLfloat b = (src[2]) / 255.0;
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GLfloat y, cr, cb;
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GLint iy, icr, icb;
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y = r * 65.481 + g * 128.553 + b * 24.966 + 16;
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cb = r * -37.797 + g * -74.203 + b * 112.0 + 128;
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cr = r * 112.0 + g * -93.786 + b * -18.214 + 128;
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/*printf("%f %f %f -> %f %f %f\n", r, g, b, y, cb, cr);*/
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iy = (GLint) CLAMP(y, 0, 254);
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icb = (GLint) CLAMP(cb, 0, 254);
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icr = (GLint) CLAMP(cr, 0, 254);
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if (j & 1) {
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/* odd */
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*dest = (iy << 8) | icr;
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}
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else {
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/* even */
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*dest = (iy << 8) | icb;
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}
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dest++;
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src += texel_bytes;
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}
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}
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}
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/*
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* Load an SGI .rgb file and return a pointer to the image data, converted
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* to 422 yuv.
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*
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* Input: imageFile - name of .rgb to read
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* Output: width - width of image
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* height - height of image
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* Return: pointer to image data or NULL if error
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*/
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GLushort *LoadYUVImage( const char *imageFile, GLint *width, GLint *height )
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{
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TK_RGBImageRec *image;
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GLushort *buffer;
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image = tkRGBImageLoad( imageFile );
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if (!image) {
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return NULL;
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}
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if (image->components != 3 && image->components !=4 ) {
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/* not implemented */
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fprintf(stderr,
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"Error in LoadYUVImage %d-component images not implemented\n",
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image->components );
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FreeImage(image);
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return NULL;
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}
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*width = image->sizeX;
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*height = image->sizeY;
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buffer = (GLushort *) malloc( image->sizeX * image->sizeY * 2 );
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if (buffer)
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ConvertRGBtoYUV( image->sizeX,
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image->sizeY,
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image->components,
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image->data,
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buffer );
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FreeImage(image);
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return buffer;
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}
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