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SDL and opengl textures


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#1 Salatinjsh   Members   -  Reputation: 106

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Posted 28 September 2012 - 05:50 AM

Hello!

I have decided to move from glut to SDL to make window and handle other things. But now i encounter an issue. When im trying to print texture on objects it does nothing. I have tried different ways of loading textures but it seems not to be the problem

Linker:
SOIL
mingw32
SDLmain
SDL
opengl32
glu32

Im using classes:

Main App:
[source lang="cpp"]#include "CApp.h"CApp::CApp() { Surf_Display = NULL; w = 640; h = 480; Running = true; angle = 0;}int CApp::OnExecute() { if(OnInit() == false) { return -1; } glLoadIdentity(); SDL_Event Event; while(Running) { while(SDL_PollEvent(&Event)) { OnEvent(&Event); } OnLoop(); OnRender(); } OnCleanup(); glGetError(); return 0;}int main(int argc, char* argv[]) { CApp theApp; return theApp.OnExecute();}[/source]
Main header
[source lang="cpp"]#ifndef _CAPP_H_ #define _CAPP_H_#include <SDL/SDL.h>#include <GL/gl.h>#include <GL/glu.h>#include <GL/SOIL.h>#include <iostream>#include "CEvent.h"class CApp : public CEvent { private: // local variables bool Running; int w,h; //window width and height SDL_Surface* Surf_Display; GLuint texture[3]; GLUquadricObj* quadratic; GLfloat angle; public: CApp(); int OnExecute(); public: // Natural things in game application bool OnInit(); void OnEvent(SDL_Event* Event); void OnLoop(); void OnRender(); void OnCleanup(); public: // Events used void OnKeyDown(SDLKey sym, SDLMod mod, Uint16 unicode); void OnExit();};#endif[/source]
Init:
[source lang="cpp"]#include "CApp.h"void RenderInit();GLuint LoadTextures(const char* filename);bool CApp::OnInit() { if(SDL_Init(SDL_INIT_EVERYTHING) < 0) { return false; } SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16); SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE, 32); SDL_GL_SetAttribute(SDL_GL_ACCUM_RED_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_ACCUM_GREEN_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_ACCUM_ALPHA_SIZE, 8); SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1); SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 2); if((Surf_Display = SDL_SetVideoMode(w, h, 32, SDL_HWSURFACE | SDL_GL_DOUBLEBUFFER | SDL_OPENGL)) == NULL) { return false; } SDL_ShowCursor(SDL_DISABLE); texture[0] = LoadTextures("Crate.bmp"); quadratic=gluNewQuadric(); gluQuadricNormals(quadratic, GLU_SMOOTH); gluQuadricTexture(quadratic, GL_TRUE); RenderInit(); glClearColor(0,0,0,1); glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); gluPerspective(45, (double)w / (double)h, 1, 200); GLfloat AmbientLightColor[] = {0,0,0, 1}; glLightModelfv(GL_LIGHT_MODEL_AMBIENT, AmbientLightColor); GLfloat Light0Color[] = {0.8,0.8,0.8,1}; GLfloat Light0Pos[] = {0.000000000000000000000000000000000000015,0,0}; glLightfv(GL_LIGHT0, GL_DIFFUSE, Light0Color); glLightfv(GL_LIGHT0, GL_POSITION, Light0Pos); glMatrixMode(GL_MODELVIEW); glEnable(GL_BLEND); glEnable(GL_DEPTH_TEST); glEnable(GL_TEXTURE_2D); glShadeModel(GL_SMOOTH); glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background glClearDepth(1.0f); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); return true;}void RenderInit(){ glNewList(1, GL_COMPILE); glBegin(GL_QUADS); glNormal3f(0,0,-1); glTexCoord2d(0,0);glVertex3d(-1,-1,-1); glTexCoord2d(1,0);glVertex3d(1,-1,-1); glTexCoord2d(1,1);glVertex3d(1,1,-1); glTexCoord2d(0,1);glVertex3d(-1,1,-1); glNormal3f(0,0,1); glTexCoord2d(0,0);glVertex3d(-1,-1,1); glTexCoord2d(1,0);glVertex3d(1,-1,1); glTexCoord2d(1,1);glVertex3d(1,1,1); glTexCoord2d(0,1);glVertex3d(-1,1,1); glNormal3f(-1,0,0); glTexCoord2d(1,0);glVertex3d(-1,-1,-1); glTexCoord2d(1,1);glVertex3d(-1,1,-1); glTexCoord2d(0,1);glVertex3d(-1,1,1); glTexCoord2d(0,0);glVertex3d(-1,-1,1); glNormal3f(1,0,0); glTexCoord2d(1,0);glVertex3d(1,-1,-1); glTexCoord2d(1,1);glVertex3d(1,1,-1); glTexCoord2d(0,1);glVertex3d(1,1,1); glTexCoord2d(0,0);glVertex3d(1,-1,1); glEnd(); glEndList();}GLuint LoadTextures(const char* filename){ GLuint texture = SOIL_load_OGL_texture ( filename, SOIL_LOAD_AUTO, SOIL_CREATE_NEW_ID, SOIL_FLAG_INVERT_Y ); if(texture == 0) return false; 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); return texture;}[/source]
Render:
[source lang="cpp"]#include "CApp.h"void CApp::OnRender() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslated(0,0,-5); glTranslated(0,0,-5); glRotatef(angle,0,1,0); //glRotatef(90,-1,0,0); glBindTexture(GL_TEXTURE_2D, texture[0]); //gluSphere(quadratic,1.3,32,16); glBegin(GL_QUADS); glTexCoord2d(0,0);glVertex3d(-1,-1,0); glTexCoord2d(0,1);glVertex3d(-1,1,0); glTexCoord2d(1,1);glVertex3d(1,1,0); glTexCoord2d(1,0);glVertex3d(1,-1,0); glEnd(); SDL_GL_SwapBuffers();}[/source]

ill be glad if someone could help. i've been looking for issue for about week now.

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#2 ic0de   Members   -  Reputation: 909

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Posted 30 September 2012 - 06:55 PM

I don't see anything wrong with you code but try setting:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

in case your texture is too small and is being mapped somewhere you cant see.

also since you're already using SDL you might want to try using SDL_image for image loading instead of SOIL. you use SDL_image to load an image to a surface and then find the format and number of colors. then you use glteximage2d to get the image from surface->pixels.

surface = IMG_Load("texture.png");

GLenum texture_format;
GLint  nOfColors;
GLuint texture;
nOfColors = surface->format->BytesPerPixel;

glGenTextures( 1, &texture );
glBindTexture( GL_TEXTURE_2D, texture );

if (nOfColors == 4)	 // contains an alpha channel
{
  if (surface->format->Rmask == 0x000000ff)
  {
   texture_format = GL_RGBA;
  }
  else
  {
   texture_format = GL_BGRA;
  }
}
else if (nOfColors == 3)	 // no alpha channel
{
  if (surface->format->Rmask == 0x000000ff)
  {
   texture_format = GL_RGB;
  }
  else
  {
   texture_format = GL_BGR;
  }
}


glTexImage2D( GL_TEXTURE_2D, 0, nOfColors, surface->w, surface->h, 0, texture_format, GL_UNSIGNED_BYTE, surface->pixels );

SDL_FreeSurface(surface);

Edited by ic0de, 30 September 2012 - 06:57 PM.

you know you program too much when you start ending sentences with semicolons;


#3 Salatinjsh   Members   -  Reputation: 106

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Posted 03 October 2012 - 10:12 AM

Well thanks for answer. :)
I have tryed usng soil and SDL but no difference and

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

didn't help. :(
Can it be problem with libraries? can they be at wrong positions?

#4 zeidrich   Members   -  Reputation: 125

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Posted 03 October 2012 - 02:34 PM

You are using immediate mode, which is deprecated.

Is GLuint LoadTextures(const char* filename) returning successfully? You have it return false when it fails, but you never test to see if it failed, you just assume that it succeeds.

It could be something as simple as not having the correct file path or format of the texture being loaded, and since you just ignore it and try not to set the texture if it fails, you never know. I don't know enough about the bmp format you're using for "Crate.bmp", how SOIL is used, or where the file is located to make a judgment, however I am certain that if you were to fail to load the texture properly and SOIL_load_OGL_texture returned 0, you would experience the issue you are noticing.

#5 ic0de   Members   -  Reputation: 909

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Posted 04 October 2012 - 12:08 PM

You are using immediate mode, which is deprecated.


Immediate mode may be deprecated in OpenGL 3.0 but they are still useful for teaching beginners about OpenGL. teaching beginners OGL 3.0 is one sure way to confuse them.

you know you program too much when you start ending sentences with semicolons;





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