| /* 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 <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; |
| |
| 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; |
| } |
| if ((raw->file = fopen(fileName, "rb")) == NULL) { |
| perror(fileName); |
| return NULL; |
| } |
| |
| fread(raw, 1, 12, raw->file); |
| |
| if (swapFlag) { |
| ConvertShort(&raw->imagic, 6); |
| } |
| |
| 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"); |
| 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"); |
| return NULL; |
| } |
| raw->rleEnd = 512 + (2 * x); |
| fseek(raw->file, 512, SEEK_SET); |
| fread(raw->rowStart, 1, x, raw->file); |
| fread(raw->rowSize, 1, x, raw->file); |
| 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; |
| |
| if ((raw->type & 0xFF00) == 0x0100) { |
| fseek(raw->file, (long) raw->rowStart[y+z*raw->sizeY], SEEK_SET); |
| fread(raw->tmp, 1, (unsigned int)raw->rowSize[y+z*raw->sizeY], |
| raw->file); |
| |
| 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); |
| fread(buf, 1, raw->sizeX, raw->file); |
| } |
| } |
| |
| |
| 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"); |
| } |
| |
| 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"); |
| 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 ); |
| 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 ); |
| return NULL; |
| } |
| |
| *width = image->sizeX; |
| *height = image->sizeY; |
| |
| bytes = image->sizeX * image->sizeY * image->components; |
| buffer = (GLubyte *) malloc(bytes); |
| if (!buffer) |
| 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 ); |
| 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; |
| } |
| |
