_SDL_main error and missing functions

Alex Barry | 6 Jun 2012 16:43

Re: _SDL_main error and missing functions

For your first, there's a good chance that you're not taking endianness into account for your colour stuff. Here is how I did it (thanks to many people here on the mailing list); https://github.com/mrozbarry/bitfighter-experiments/blob/master/bitfighter1.0/sdlutil.cpp#L349

Second, your best bet is probably SDL_image, an add-on library to SDL, found here: http://www.libsdl.org/projects/SDL_image/

I hope that helps,

-Alex

On Wed, Jun 6, 2012 at 3:47 AM, telandor <ricowidmer <at> gmx.ch> wrote:

Hi, I am new to SDL (v 1.2.15) and have two problems with this code:

Code:

#include

void Mesh::createTextures() {
SDL_Init(SDL_INIT_EVERYTHING);
SDL_Surface *surface;
surface = SDL_LoadBMP("..\\..\\resources\\textures\\bla.bmp");
int mode;
if (surface->format->BytesPerPixel == 3) { // RGB 24bit
mode = GL_RGB;
} else if (surface->format->BytesPerPixel == 4) { // RGBA 32bit
mode = GL_RGBA;
}
glGenTextures(1, &_textureID);
glBindTexture(GL_TEXTURE_2D, _textureID);
glTexImage2D(GL_TEXTURE_2D, 0, mode, surface->w, surface->h, 0, mode, GL_UNSIGNED_BYTE, surface->pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
}

First:
A texture which is completely red is shown blue. When I change the second mode to GL_BGR though OpenGL renders nothing.

Second:
How can I load other images than BMP? I can only find the function SDL_LoadBMP().

I hope anybody can help me out with this.

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Code:

#include void Mesh::createTextures() { SDL_Init(SDL_INIT_EVERYTHING); SDL_Surface *surface; surface = SDL_LoadBMP("..\\..\\resources\\textures\\bla.bmp"); int mode; if (surface->format->BytesPerPixel == 3) { // RGB 24bit mode = GL_RGB; } else if (surface->format->BytesPerPixel == 4) { // RGBA 32bit mode = GL_RGBA; } glGenTextures(1, &_textureID); glBindTexture(GL_TEXTURE_2D, _textureID); glTexImage2D(GL_TEXTURE_2D, 0, mode, surface->w, surface->h, 0, mode, GL_UNSIGNED_BYTE, surface->pixels); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); }