need help getting quicktime to load textures

xDexx

Unregistered

Post: #1

May 6, 2003 — 11:44 AM

i have been looking the QTValuePak and this is what i ended up doing in my program.

Code:

GWorldPtr gw;

    FSRef fsref;

    FSSpec spec;

    Boolean dirSize;

    Rect imageSize;

    void* buffer;

    FSPathMakeRef((const UInt8*)"/Users/brettsawyer/Desktop/face.pict", &fsref, &dirSize);

    FSGetCatalogInfo(&fsref, kFSCatInfoNone, NULL, NULL, &spec, NULL);

    buffer = malloc(160);

    QTNewGWorldFromPtr(&gw, k32ARGBPixelFormat, 0, NULL, NULL,

                       0, buffer, 128);

    drawFile(&spec, &imageSize);

    glEnable(GL_TEXTURE_2D);

    glBindTexture(GL_TEXTURE_2D, 1);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8,32, 32, 0,GL_BGRA_EXT, GL_UNSIGNED_INT_8_8_8_8_REV,buffer);

     DisposeGWorld(gw);

     free(buffer);

    glBegin(GL_QUADS);

    glTexCoord2i((x - TILESIZE/2),(y - TILESIZE/2));

    glVertex2i((x - TILESIZE/2),(y - TILESIZE/2));

    glTexCoord2i((x + TILESIZE/2),(y - TILESIZE/2));

    glVertex2i((x + TILESIZE/2),(y - TILESIZE/2));

    glTexCoord2i((x + TILESIZE/2),(y + TILESIZE/2));

    glVertex2i((x + TILESIZE/2),(y + TILESIZE/2));

    glTexCoord2i((x - TILESIZE/2),(y + TILESIZE/2));

    glVertex2i((x - TILESIZE/2),(y + TILESIZE/2));

    glEnd();

then here is the drawFile() function

Code:

void drawFile(const FSSpec *fss, const Rect *boundsRect)

    {

        GraphicsImportComponent gi;

        GetGraphicsImporterForFile(fss, &gi);

        GraphicsImportSetBoundsRect(gi, boundsRect);

        GraphicsImportDraw(gi);

        CloseComponent(gi);

    }

my image is 32x32 pixels. it displays an image but its all screwed up and is nothing like the one i made. what am i doing wrong?

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #2

May 6, 2003 — 02:02 PM

Well for a start 32 * 32 * 4 is 4096, not 160...

xDexx

Unregistered

Post: #3

May 7, 2003 — 02:44 PM

ok so i rewrote some of it and now it draws the image!

but its weird, it draws the image right below the apple it isnt even in the window, and the items i drew with open are all discolored and some are missing. i am thinking that i am just not drawing my little image is the right spot, anyone know what i need to do to fix this? thanks for the help! here is my code:

Code:

GWorldPtr gw;

    FSRef fsref;

    FSSpec spec;

    Boolean dirSize;

    Rect imageSize;

    void* buffer;

    GraphicsImportComponent gi;

    FSPathMakeRef((const UInt8*)"/Users/brettsawyer/Desktop/face.pict", &fsref, &dirSize);

    FSGetCatalogInfo(&fsref, kFSCatInfoNone, NULL, NULL, &spec, NULL);

    GetGraphicsImporterForFile(&spec, &gi);

    GraphicsImportGetNaturalBounds(gi, &imageSize);

    buffer = malloc(TILESIZE * TILESIZE * 4);

    QTNewGWorldFromPtr(&gw, k32ARGBPixelFormat, &imageSize, NULL, NULL,

                       0, buffer, TILESIZE * 4);

    GraphicsImportDraw(gi);

    CloseComponent(gi);

    glEnable(GL_TEXTURE_2D);

    glBindTexture(GL_TEXTURE_2D, 1);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, TILESIZE, TILESIZE, 0, GL_BGRA_EXT,

                 GL_UNSIGNED_INT_8_8_8_8_REV, buffer);

     DisposeGWorld(gw);

     free(buffer);

    glBegin(GL_QUADS);

    glTexCoord2i((x - TILESIZE/2),(y - TILESIZE/2));

    glVertex2i((x - TILESIZE/2),(y - TILESIZE/2));

    glTexCoord2i((x + TILESIZE/2),(y - TILESIZE/2));

    glVertex2i((x + TILESIZE/2),(y - TILESIZE/2));

    glTexCoord2i((x + TILESIZE/2),(y + TILESIZE/2));

    glVertex2i((x + TILESIZE/2),(y + TILESIZE/2));

    glTexCoord2i((x - TILESIZE/2),(y + TILESIZE/2));

    glVertex2i((x - TILESIZE/2),(y + TILESIZE/2));

    glEnd();

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #4

May 7, 2003 — 03:07 PM

You're missing a call to GraphicsImportSetGWorld(gi, gw, NULL) between QTNewGWorldFromPtr and GraphicsImportDraw.

xDexx

Unregistered

Post: #5

May 7, 2003 — 03:20 PM

now i THINK its drawing in the window but i think its enlarging it massivly. i added that line then all that was in the window was a white background and a black line, then i went in to my face.pict and changed the background to blue and now i have a blue screen with a black line. would the GWorld window size be a different ratio and 32x32 is just massive? maybe i need to tell quicktime that the window i have is 640x480 or something? thanks for all your help! you are my hero!
-brett

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #6

May 7, 2003 — 03:25 PM

I suspect you just have your texture coordinates and/or vertex coordinates wrong. Have you changed the projection anywhere? Try using (0, 0), (1, 0), (1, 1), (0, 1) as your texture coordinates.

xDexx

Unregistered

Post: #7

May 7, 2003 — 03:39 PM

that worked! but i dont understand why. when texturing if a square is 600pixels by 300 pixels then when i put a texture on it at (0,0),(1,0),(1,1),(0,1) the texture will fill the whole square? also the way i have it set up is it loads the image everytime it draws about 350 32x32 squares, so it is really slow. how would i load the texture once then refer to it each time i want to each square?
thanks!
-brett

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #8

May 7, 2003 — 03:46 PM

Sounds like you need a basic OpenGL tutorial. You can try NeHe (http://nehe.gamedev.net) or jump straight into the red book (http://fly.cc.fer.hr/~unreal/theredbook/)

In short, texture ID 1 now has the image associated with it, so if you want to use the texture again, you can just go glBindTexture(GL_TEXTURE_2D, 1); again without the need for the glTexImage2D.

Texture coordinates always run 0..1, 0..1 (unless you're using the GL_EXT_texture_rectangle extension, but that's an advanced topic...)

xDexx

Unregistered

Post: #9

May 7, 2003 — 03:57 PM

cool thanks, i will check those out. thanks for all your help!
-brett

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