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#include <GL/gl.h>
#include <GL/glu.h>
#include "gltexture.h"
#include "General.h"
mogltk::texture::texture(int w, int h, bool plane) throw (GeneralException) : width(w), height(h), planar(plane) {
if ((BITCOUNT(w) != 1) || (BITCOUNT(h) != 1))
throw GeneralException("Size of the texture not a power of 2!");
if (!(surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32,
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
0xff000000,
0x00ff0000,
0x0000ff00,
0x000000ff
#else
0x000000ff,
0x0000ff00,
0x00ff0000,
0xff000000
#endif
))) {
throw GeneralException("Can't create RGB Surface");
}
}
mogltk::texture::~texture() {
if (surface) {
SDL_FreeSurface(surface);
} else {
glDeleteTextures(1, &tex);
}
}
SDL_Surface * mogltk::texture::GetSurface() throw (GeneralException) {
if (!surface)
throw GeneralException("Texture already generated");
return surface;
}
void mogltk::texture::Generate() throw (GeneralException) {
if (!surface)
throw GeneralException("Texture already generated");
if (planar) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, surface->pixels);
} else {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, width, height, GL_RGBA, GL_UNSIGNED_BYTE, surface->pixels);
// glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, surface->pixels);
}
SDL_FreeSurface(surface);
surface = 0;
}
void mogltk::texture::Bind(bool expand) throw (GeneralException) {
if (surface)
throw GeneralException("Texture is not yet generated");
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, tex);
if (expand) {
glMatrixMode(GL_TEXTURE);
glLoadIdentity();
glScaled(1 / (double) width, 1 / (double) height, 1);
glMatrixMode(GL_MODELVIEW);
}
}
GLuint mogltk::texture::GetWidth() {
return width;
}
GLuint mogltk::texture::GetHeight() {
return height;
}
void mogltk::texture::Unbind(void) {
glDisable(GL_TEXTURE_2D);
}
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