linux 下 OpenGL 读取 JPG, PNG, TAG 纹理数据

实际读取图片的代码已经上传到我的资源里面； 下面贴出使用例子:

unsigned char*  esLoadJPG(const char *fileName, int *width, int *height, int *size)

{

FILE *f = fopen(fileName, "rb");

fseek(f, 0, SEEK_END);

*size = ftell(f);

fseek(f, 0, SEEK_SET);

unsigned char *data = (unsigned char*)malloc(*size);

fread(data, 1, *size, f);

JpegDecoder dec(data, *size);

dec.init();

dec.decodeJpeg();

*width = dec.getW();

*height = dec.getH();

*size = dec.getSize();

unsigned char *buffer = (unsigned char*)malloc(*size);

memcpy(buffer, dec.getbmpData(), *size);

return buffer;

}

unsigned char*  esLoadTGA (const char *fileName, int *width, int *height, int *size)

{

unsigned char *buffer = NULL;

FILE *f;

unsigned char tgaheader[12];

unsigned char attributes[6];

unsigned int imagesize;

f = fopen(fileName, "rb");

if(f == NULL) return NULL;

if(fread(&tgaheader, sizeof(tgaheader), 1, f) == 0)

{

fclose(f);

return NULL;

}

if(fread(attributes, sizeof(attributes), 1, f) == 0)

{

fclose(f);

return 0;

}

*width = attributes[1] * 256 + attributes[0];

*height = attributes[3] * 256 + attributes[2];

imagesize = attributes[4] / 8 * *width * *height;

*size = imagesize;

buffer = (unsigned char*)malloc(imagesize);

if (buffer == NULL)

{

fclose(f);

return 0;

}

if(fread(buffer, 1, imagesize, f) != imagesize)

{

free(buffer);

return NULL;

}

fclose(f);

return buffer;

}

unsigned char*  esLoadPNG ( const char *fileName, int *width, int *height, int *size)

{

FILE *f = fopen(fileName, "rb");

fseek(f, 0, SEEK_END);

*size = ftell(f);

fseek(f, 0, SEEK_SET);

unsigned char *data = (unsigned char*)malloc(*size);

fread(data, 1, *size, f);

PngDecoder dec(data, *size);

dec.init();

dec.decoderPng();

*width = dec.getW();

*height = dec.getH();

*size = dec.getSize();

unsigned char *buffer = (unsigned char*)malloc(*size);

memcpy(buffer, dec.getbmpData(), *size);

return buffer;

}