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/*
Ronny Andr�Reierstad
http://www.morrowland.com
http://www.morrowland.com/apron/tut_gl.php
apron@morrowland.com
*/
#include "filesystem/filesystem.h"
#include "render/tga.h"
#include "sys/sys.h"
#include "GL/gl.h"
#include <GL/glu.h>
namespace render
{
/////////////////////////////////////////////////////////////////////////////////////////////////
// TGA TEXTURE LOADER
/////////////////////////////////////////////////////////////////////////////////////////////////
void TGA::texture(GLuint textureArray[], const char *filename, int ID)
{
if(!filename)
return;
filesystem::File f;
f.open(filename);
if (!f.is_open())
return;
f.close();
image *pBitMap = load(f.path().c_str());
if(pBitMap == 0) {
con_warn << "could not load " << f.path().c_str() << std::endl;
return;
}
glGenTextures(1, &textureArray[ID]);
glBindTexture(GL_TEXTURE_2D, textureArray[ID]);
int textureType = GL_RGB;
if(pBitMap->channels == 4) textureType = GL_RGBA;
gluBuild2DMipmaps(GL_TEXTURE_2D, pBitMap->channels, pBitMap->size_x, pBitMap->size_y, textureType, GL_UNSIGNED_BYTE, pBitMap->data);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR_MIPMAP_LINEAR);
if (pBitMap)
{
if (pBitMap->data)
{
free(pBitMap->data);
}
free(pBitMap);
}
}
TGA::image *TGA::load(const char *filename)
{
image *pImgData = NULL;
FILE *pFile = NULL;
GLushort width = 0;
GLushort height = 0;
GLubyte length = 0;
GLubyte imgType = 0;
GLubyte bits = 0;
GLushort channels = 0;
GLushort stride = 0;
pFile = fopen(filename, "rb");
if (!pFile)
return 0;
pImgData = (image*)malloc(sizeof(image));
fread(&length, sizeof(GLubyte), 1, pFile);
fseek(pFile,1,SEEK_CUR);
fread(&imgType, sizeof(GLubyte), 1, pFile);
fseek(pFile, 9, SEEK_CUR);
fread(&width, sizeof(GLushort), 1, pFile);
fread(&height, sizeof(GLushort), 1, pFile);
fread(&bits, sizeof(GLubyte), 1, pFile);
con_debug << "TGA loading " << width << "x" << height << " " << (int) bits << "bpp" << std::endl;
fseek(pFile, length + 1, SEEK_CUR);
if(imgType != TGA_RLE)
{
// Check for 24 or 32 Bit
if(bits == 24 || bits == 32)
{
channels = bits / 8;
stride = channels * width;
pImgData->data = new unsigned char[stride * height];
for(GLushort y = 0; y < height; y++)
{
unsigned char *pLine = &(pImgData->data[stride * y]);
fread(pLine, stride, 1, pFile);
for(GLushort i = 0; i < stride; i += channels)
{
int temp = pLine[i];
pLine[i] = pLine[i + 2];
pLine[i + 2] = temp;
}
}
}
// Check for 16 Bit
else if(bits == 16)
{
unsigned short pixels = 0;
int r=0, g=0, b=0;
channels = 3;
stride = channels * width;
pImgData->data = new unsigned char[stride * height];
for(int i = 0; i < width*height; i++)
{
fread(&pixels, sizeof(GLushort), 1, pFile);
b = (pixels & 0x1f) << 3;
g = ((pixels >> 5) & 0x1f) << 3;
r = ((pixels >> 10) & 0x1f) << 3;
pImgData->data[i * 3 + 0] = r;
pImgData->data[i * 3 + 1] = g;
pImgData->data[i * 3 + 2] = b;
}
}
else
return NULL;
}
else
{
GLubyte rleID = 0;
int colorsRead = 0;
channels = bits / 8;
stride = channels * width;
pImgData->data = new unsigned char[stride * height];
GLubyte *pColors = new GLubyte [channels];
int i = 0;
while(i < width*height)
{
fread(&rleID, sizeof(GLubyte), 1, pFile);
if(rleID < 128) {
rleID++;
while(rleID)
{
fread(pColors, sizeof(GLubyte) * channels, 1, pFile);
pImgData->data[colorsRead + 0] = pColors[2];
pImgData->data[colorsRead + 1] = pColors[1];
pImgData->data[colorsRead + 2] = pColors[0];
if(bits == 32) pImgData->data[colorsRead + 3] = pColors[3];
i++;
rleID--;
colorsRead += channels;
}
}
else
{
rleID -= 127;
fread(pColors, sizeof(GLubyte) * channels, 1, pFile);
while(rleID)
{
pImgData->data[colorsRead + 0] = pColors[2];
pImgData->data[colorsRead + 1] = pColors[1];
pImgData->data[colorsRead + 2] = pColors[0];
if(bits == 32) pImgData->data[colorsRead + 3] = pColors[3];
i++;
rleID--;
colorsRead += channels;
}
}
}
delete[] pColors;
}
fclose(pFile);
pImgData->channels = channels;
pImgData->size_x = width;
pImgData->size_y = height;
return pImgData;
}
}
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