void Texture()
{
SDL_Surface *bmp = new SDL_Surface;
bmp = SDL_LoadBMP("C:\\bmp.bmp");
glGenTextures(1, &texture[0]);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexImage2D(GL_TEXTURE_2D, 0, 3, bmp->w, bmp->h, 0, GL_RGB, GL_UNSIGNED_BYTE, bmp->pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
SDL_Surface (SDL_LoadBMP) to GL texture?
August 13, 2005 01:27 PM
Hey there. I am trying to figure out a way to use SDL surfaces (from SDL_LoadBMP) to create textures usable in OpenGL. Well, this is how I am doing it:
It's not commented or anything, because I just created the function to test it. Well, I can get it to work, somewhat. When I bind the texture to the quad, all the blue is taken from the image. Can anyone tell me what is wrong, please?
Thanks in advance,
Matt U.
:==-_ Why don't the voices just leave me alone?! _-==:
163
August 13, 2005 01:55 PM
I don't know if this will help but try changing 3 to 4 and GL_RGB to GL_RGBA in your MipMaps function. I don't know if that will help though.
Also, did you enable 2d texturing?
-- Brandon Fogerty
http://www.jujikasoft.com
GOD Bless you Always my Friends!!!
Also, did you enable 2d texturing?
-- Brandon Fogerty
http://www.jujikasoft.com
GOD Bless you Always my Friends!!!
1,410
August 15, 2005 11:39 AM
If the format was wrong the texture would be corrupted far more than just missing blue. I suspect you simply have a glColor3f(1.0f, 1.0f, 0.0f); call or equivalent somewhere before you render your texture. Remember that by default the texture is modulated with the current colour (per-component multiplied). Make sure you specify white as the current colour before you render textured polygons or change the texture mode to GL_DECAL or GL_REPLACE.
Enigma
Enigma
122
August 25, 2005 07:41 AM
SDL_Surface *bmp = new SDL_Surface;bmp = SDL_LoadBMP("C:\\bmp.bmp");Also, you do not have to allocate memory with new, SDL_LoadBMP does that. If you want to free an SDL_Surface you should use SDL_FreeSurface.
Other problem, from the SDL doc:
Quote: Note: When loading a 24-bit Windows BMP file, pixel data points are loaded as blue, green, red, and NOT red, green, blue (as one might expect).
Here is my bmp loader, that uses SDL_Surface:
#ifndef _H_TEXTURE_#define _H_TEXTURE_#include <gl/glu.h>class TEXTURE{ private: GLuint id; public: ~TEXTURE(); int LoadBMP(const char *); GLuint GetID(void) { return id; }};#endif#include "texture.h"#include "SDL.h"TEXTURE::~TEXTURE(){ if(glIsTexture(id)) glDeleteTextures(1,&id);}int TEXTURE::LoadBMP(const char *fname){ int i, size; unsigned char *data, swp; SDL_Surface *bmp; bmp=SDL_LoadBMP(fname); if(!bmp) return 0; if(bmp->format->BitsPerPixel!=24) { SDL_FreeSurface(bmp); return 0; } size=3*bmp->w*bmp->h; data=(unsigned char*)bmp->pixels; //bgr to rgb for(i=0;i<size;i+=3) { swp=data; data=data[i+2]; data[i+2]=swp; } glGenTextures(1,&id); glBindTexture(GL_TEXTURE_2D,id); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexImage2D(GL_TEXTURE_2D,0,GL_RGB,bmp->w,bmp->h,0,GL_RGB,GL_UNSIGNED_BYTE,data); SDL_FreeSurface(bmp); return 1;}I hope I could help.
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