static GLuint make_texture(const char *filename)
{
int width, height;
void *pixels = read_tga(filename, &width, &height);
GLuint texture;
if (!pixels)
return 0;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(
GL_TEXTURE_2D, 0, /* target, level */
GL_RGB8, /* internal format */
width, height, 0, /* width, height, border */
GL_BGR, GL_UNSIGNED_BYTE, /* external format, type */
pixels /* pixels */
);
free(pixels);
return texture;
}
static GLuint make_texture(const char*filename)
{
GLuint texture;
int width, height;
void *pixels = read_tga(filename, &width, &height);
if(!pixels)
{
return 0;
}
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
// opengl uses s, t, r axis
// where t can be up or down and the other two are arbitrary
// since tag store pixels left-to-right and bottom-to-top
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// the following function allocates memory for the texture
glTexImage2D(
GL_TEXTURE_2D, 0, /* target, level of detail */
GL_RGB8, /* internal format*/
width, height, 0, /* width, height, border*/
GL_BGR, GL_UNSIGNED_BYTE, /*external format, type*/
pixels); /* the pixels*/
free(pixels);
return texture;
}
GLuint Texture::loadTGATexture(const std::string& imagepath, GLenum wrap_s, GLenum wrap_t, GLenum mag_filter, GLenum min_filter, bool anisotropy)
{
int width, height, depth;
char * datas = read_tga(imagepath.data(), width, height, depth);
GLuint textureID=0;
glGenTextures(1,&textureID);
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0 , GL_RGB, width, height, 0, GL_BGR, GL_UNSIGNED_BYTE, datas);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap_s);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap_t);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter);
glGenerateMipmap(GL_TEXTURE_2D);
if(anisotropy)
{
GLfloat maxAniso = 0.0f;
glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &maxAniso);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, maxAniso);
}
return textureID;
}
GLuint loadTGATexture(const std::string& imagepath, GLenum wrap_s, GLenum wrap_t, GLenum mag_filter, GLenum min_filter, float anisotropy)/*{{{*/
{
//!todo [Textures] exercice 1: load a texture from a file into the GPU as follows,
// 1) Generate a texture location in GPU
// 2) Make it active (bind it)
// 3) Load the texture file into a CPU buffer
// (using the read_tga routine from utils/textures.h)
// 4) Send this data to the GPU (glTexImage2D)
// 5) Set up the Wrap and filter parameters.
// Create one OpenGL texture
GLuint textureID=0;
glGenTextures(1, &textureID);
glBindTexture(GL_TEXTURE_2D, textureID);
int width, height;
char* texture = read_tga(imagepath.c_str(), width, height);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_BGR, GL_UNSIGNED_BYTE, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap_s);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap_t);
// Interpolation method
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, anisotropy);
glGenerateMipmap(GL_TEXTURE_2D);
return textureID;
}/*}}}*/
Matrix<Color> read_img(std::string filename)
{
std::size_t n = filename.size();
std::string extension3 = filename.substr(n-3, n);
std::string extension4 = filename.substr(n-4, n);
if(!extension3.compare("bmp"))
{
return read_bmp(filename);
}
else if(!extension3.compare("gif"))
{
return read_gif(filename);
}
else if(!extension3.compare("ico"))
{
return read_ico(filename);
}
/*else if(!extension3.compare("jpg"))
{
return read_jpeg(filename);
}*/
else if(!extension3.compare("pcx"))
{
return read_pcx(filename);
}
else if(!extension3.compare("png"))
{
return read_png(filename);
}
else if(!extension3.compare("pbm"))
{
return bw2colorimage(read_pbm(filename));
}
else if(!extension3.compare("pgm"))
{
return gray2colorimage(read_pgm(filename));
}
else if(!extension3.compare("ppm"))
{
return read_ppm(filename);
}
else if(!extension3.compare("tga"))
{
return read_tga(filename);
}
else if(!extension4.compare("tiff"))
{
return read_tiff(filename);
}
else
{
return Matrix<Color>();
}
}
