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Textured Quads Problem (SDL/OPENGL)

 
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NovaCaine



Joined: 20 Dec 2005
Posts: 34
Location: New Zealand
PostPosted: Fri Feb 10, 2006 12:12 pm    Post subject: Textured Quads Problem (SDL/OPENGL) Reply with quote
Hey all,

I have a new problem now, and my instant guess is I either forgot something or I'm doing something I shouldn't be.

First of all this code runs fine thru SDL on Windows - so I dont think its the code (mainly just hacked together from various tutorials) hence the guess of doing something I shouldn't be. Also just want to point out that I want to keep the code so that it will run on both windows and PSP with minimal code differences.

The problem is it wont render the texture, just a black quad.

Heres the code (it's in a cpp file, thats why theres an extern C)
Code:

/* Test SDL OpenGL support. */
#include <stdio.h>
#include <stdlib.h>

#include "SDL.h"
#include "SDL_image.h"
#include "SDL_opengl.h"

#define SCREEN_WIDTH 480
#define SCREEN_HEIGHT 272

SDL_Surface*   screen;
GLuint image;//This is our texture
SDL_Surface *temp, *temp2;//This will help get the pixel data for our texture

int LoadGLTextures()                           // Load Bitmaps And Convert To Textures
{
   // Load image
   SDL_Surface* LoadImage = IMG_Load("TEST.PNG");
   
   if (LoadImage == NULL) {
         fprintf(stderr, "IMG_Load: %s\n", IMG_GetError());
         return 1;
   }
   
   // Convert using SDL_DisplayFormatAlpha
   temp2 = SDL_DisplayFormatAlpha( LoadImage );
   // Call SDL_SetAlpha on surface
   SDL_SetAlpha( temp2, 0, 0 );
   // Create temp RGB surface and blit to it
   temp = SDL_CreateRGBSurface(temp2->flags, temp2->w, temp2->h, temp2->format->BitsPerPixel, temp2->format->Rmask, temp2->format->Gmask, temp2->format->Bmask, temp2->format->Amask );
   SDL_BlitSurface( temp2, NULL, temp, NULL );

   if ( temp ) {
             
      //Check that the image is square (width equal to height)
      if (temp->w != temp->h) {
         return 2;
      }   

      //Check that the image's width is valid and then check that the image's width is a power of 2
      if (temp->w < 1) {
         return 3;
      } else if ( !((temp->w & (temp->w-1))==0) ) {
         return 4;
      }   
             
      //Create the texture
      glGenTextures(1, &image);

      //Load the texture
      glBindTexture(GL_TEXTURE_2D, image);

      //Generate the texture
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, temp->w, temp->h, 0, GL_BGRA, GL_UNSIGNED_BYTE, temp->pixels);

      //Use nearest filtering, very good
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
   } else {
      return 5;
   }   

   //Free up our temp surface if it was ever used
   if (temp) {
      SDL_FreeSurface(temp);
      SDL_FreeSurface(temp2);
      SDL_FreeSurface(LoadImage);
   }

   return 0;                              // Return The Status
}

int DrawGLScene(GLvoid)                           // Here's Where We Do All The Drawing
{

   float x = 32.0f, y = 16.0f;

   //Make certain everything is cleared from the screen before we draw to it
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

   //Enable texturing
   glEnable(GL_TEXTURE_2D);

   // Enable transparency
   glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   glEnable(GL_BLEND);

   //Load the texture
   glBindTexture(GL_TEXTURE_2D, image);

   glBegin(GL_QUADS);
      // ISO tile
      ////Top-left vertex (corner)
      //glTexCoord2i(0,0);
      //glVertex3f(x, y-16.0f, 0.0f);

      ////Bottom-left vertex (corner)
      //glTexCoord2i(0,1);
      //glVertex3f(x-32.0f, y, 0.0f);

      ////Bottom-right vertex (corner)
      //glTexCoord2i(1,1);
      //glVertex3f(x, y+16, 0.0f);

      ////Top-right vertex (corner)
      //glTexCoord2i(1,0);
      //glVertex3f(x+32, y, 0.0f);

      // Fullscreen
      //Top-left vertex (corner)
      glTexCoord2f(0.0f,0.0f);
      glVertex3f(0.0f, 0.0f, 0.0f);

      //Bottom-left vertex (corner)
      glTexCoord2f(0.0f,1.0f);
      glVertex3f(0.0f, SCREEN_HEIGHT, 0.0f);

      //Bottom-right vertex (corner)
      glTexCoord2f(1.0f,1.0f);
      glVertex3f(SCREEN_WIDTH, SCREEN_HEIGHT, 0.0f);

      //Top-right vertex (corner)
      glTexCoord2f(1.0f,0.0f);
      glVertex3f(SCREEN_WIDTH, 0.0f, 0.0f);
   glEnd();

   //Disable texturing
   glDisable(GL_TEXTURE_2D);            // Keep Going
   glDisable(GL_BLEND);

   return 1;
}

extern "C" {
int SDL_main() {
//int main(int argc, char* argv[]) {
    int done = 0;

    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK) < 0)
    {
        fprintf(stderr, "Unable to initialize SDL: %s\n", SDL_GetError());
        return 1;
    }

      SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
      SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
      SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
      SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );
      SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
      if ( (screen=SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, 0, SDL_OPENGL | SDL_FULLSCREEN )) == NULL ) { 
        fprintf(stderr, "Unable to create OpenGL screen: %s\n", SDL_GetError());
        SDL_Quit();
        return 1;
    }

    glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0.0f, SCREEN_WIDTH, SCREEN_HEIGHT, 0.0f, -1.0f, 1.0f);
//    glOrtho(-2, 2, -2, 2, -2, 2);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

   int result = LoadGLTextures();

   if( result != 0 ) {      
      fprintf(stderr, "Unable to load textures. Returned %d\n", result);
    SDL_Quit();
    return 1;
   }

   glClearColor(1.0f,0.0f,1.0f,0.5f);
   glClearDepth(1.0f);
   glDepthFunc(GL_LEQUAL);
   glEnable(GL_DEPTH_TEST);
   glShadeModel(GL_SMOOTH);
   glDisable(GL_CULL_FACE);

  while (!done)
    {
//        glClearColor(1.0f, 0.0f, 1.0f, 0.5f);
//
//        angle += delta;
//        glMatrixMode(GL_MODELVIEW);
//        glLoadIdentity();
//        glRotatef(angle * 1.32f, 0.0f, 0.0f, 1.0f);
//
//        glShadeModel(GL_SMOOTH);
//
//        glClear(GL_COLOR_BUFFER_BIT);
//        glBegin(GL_TRIANGLES);
//            glColor3f(0.0f, 0.0f, 1.0f); glVertex3f(1.0f, 0.0f, 0.0f);
//            glColor3f(0.0f, 1.0f, 0.0f); glVertex3f(0.0f, 1.0f, 0.0f);
//            glColor3f(1.0f, 0.0f, 0.0f); glVertex3f(0.0f, 0.0f, 1.0f);
//        glEnd();
       

      DrawGLScene();

//      glFinish();

        SDL_GL_SwapBuffers();
    }

    return 0;
}
}//extern "C"


And the makefile
Code:

TARGET = hello
OBJS = Main.o

CFLAGS = -O2 -G0 -Wall
CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
ASFLAGS = $(CFLAGS)

EXTRA_TARGETS = EBOOT.PBP
PSP_EBOOT_TITLE = SDL GL

PSPSDK=$(shell psp-config --pspsdk-path)
PSPBIN = $(PSPSDK)/../bin
CFLAGS += `$(PSPBIN)/sdl-config --cflags` -DHAVE_OPENGL
LIBS += -lSDL_image -lpng -lz -ljpeg -lglut -lGLU -lGL `$(PSPBIN)/sdl-config --libs` -lm -lc -lpspdebug -lpspge -lpspdisplay -lpspctrl -lpspsdk -lpspvfpu -lpspuser -lpspkernel -lstdc++
include $(PSPSDK)/lib/build.mak


Any Ideas?

Thanks in advance for any help.
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Last edited by NovaCaine on Fri Feb 10, 2006 1:30 pm; edited 1 time in total
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HaQue



Joined: 25 Nov 2005
Posts: 91
Location: Adelaide, Australia
PostPosted: Fri Feb 10, 2006 1:29 pm    Post subject: Reply with quote
in your code it is test.png, so use that. is the /Data/ folder "Data" as in your code? and is the image actaully in YOURAPP/Data/test.png?
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NovaCaine



Joined: 20 Dec 2005
Posts: 34
Location: New Zealand
PostPosted: Fri Feb 10, 2006 1:32 pm    Post subject: Reply with quote
sorry, I just edited the whole first post to refer to a new problem. the first problem was a basic logic error

Code:

if (!LoadImage == NULL) {

should have read

if (LoadImage == NULL) {


Now my problem is the texture isn't rendering to the quad, and I get a black square instead.
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ufoz



Joined: 10 Nov 2005
Posts: 86
Location: Tokyo
PostPosted: Fri Feb 10, 2006 2:06 pm    Post subject: Reply with quote
I thought pspgl didn't support quads at all?
Or is that fixed by now? :|
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Jim



Joined: 02 Jul 2005
Posts: 487
Location: Sydney
PostPosted: Sat Feb 11, 2006 6:53 am    Post subject: Reply with quote
Correct - GL_QUADS is mapped to GL_TRIANGLE_FAN, so if you only render one quad at a time it's ok (but slow if you do lots), but it's broken if you try to draw more than one.

Jim
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NovaCaine



Joined: 20 Dec 2005
Posts: 34
Location: New Zealand
PostPosted: Sat Feb 11, 2006 1:57 pm    Post subject: Reply with quote
Jim wrote:
Correct - GL_QUADS is mapped to GL_TRIANGLE_FAN, so if you only render one quad at a time it's ok (but slow if you do lots), but it's broken if you try to draw more than one.

Jim


I had only just realised this after I had posted and left work (I currently dont have the net at home.) but even after I had changed it to triangles it crashes majorly (No BSOD, and have to manually reset the PSP). Just wondering how I would go about rendering a textured triangle, as I'm guessing there is something PSPGL doesn't like about my code.
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