+++ /dev/null
-/* 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) {
- perror(fileName);
- 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;
-}
-
projects / mesa.git / blobdiff