Graphics

25-Oct-09 4:44

The program in OpenGL with Texture just didnot work in my cimputer,which work well in others' computer.
where is the crux,any help is appreciated.
The code is in the former message.

RichardM128-Oct-09 8:44

RichardM1

28-Oct-09 8:44

I can't give a good answer for this, but I can comiserate:
If I use a rectangle to exclude an area from a Graphics drawing area in C#, on some machines it also excludes the pixel before and the pixel after the intended exclude area, but only for the horizontal axis.
Same video chip set on all machines, various drivers.
I just worked around it, but what a pain.

Silver member by constant and unflinching longevity.

Tim Craig29-Oct-09 15:35

29-Oct-09 15:35

From your code, it looked like the program gets the texture from a separate file. Did you copy the texture file to your computer along with the .exe?

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

Archy_Yu29-Oct-09 16:50

29-Oct-09 16:50

First! Thanks for you help!
then, how could i copy the texture file to my compter along with the .exe!
I could not understand you say.

My texture just didnot work! Anyone give a hand?

Luc Pattyn29-Oct-09 17:38

Luc Pattyn

29-Oct-09 17:38

Hi,

it looks like pFile = fopen("桌面.bmp", "rb"); is opening an image file; so you need to have that present next to your EXE file.

one way is to copy the files manually (you probably only copied the EXE so far);
another way (more complex) would be to create an installer;
and finally you could turn the BMP file into a resource, that would then be stored inside the EXE (that requires some code changes to use it).

Smile | :)

Luc Pattyn

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Directx

messages25-Oct-09 3:30

messages

25-Oct-09 3:30

hi everyone,
I have vista service pack 1(64bit) and I installed "Microsoft DirectX SDK (June 2006)" now my question is can I use of Directx 10 or I should use of Directx9?
how can I undrestand which one of them can I use? I asked this question because I have problem with "D3D10CreateDeviceAndSwapChain".
Thanks?

Re: Directx

Baltoro29-Oct-09 11:13

Baltoro

29-Oct-09 11:13

Initially, you want to determine the capabilities of your graphics card. That really is the main determinant for which APIs you can use in your application. Many applications call GetDeviceCaps when first initializing the Direct3D Device (this is the recommended technique both at MSDN, and in all the books written about DirectX 9 and 10 that I've read).
Have a look at: D3DCAPS Structure[^] over at MSDN.

Re: Directx

messages31-Oct-09 4:02

messages

31-Oct-09 4:02

My graphic card is 8600 gts and it supports of Directx 10.

Re: Directx

Baltoro1-Nov-09 11:29

Baltoro

1-Nov-09 11:29

Probably the most comprehensive approach is to look for the Utility that comes with the DirectX SDK (both version 9 and 10). It lives in the Utilities directory of wherever you installed the SDK on disc. As I recall, it's name is something obvious like, "DX9Capabilities". Launch it, and it will automatically query your Graphics Card and show you graphically what it's capabilities are. Then all you have to do is do a little research into what each designation actually means. The documentation that comes with the SDK should explain it all. You will discover that some DirectX APIs don't work because your Graphics Card doesn't perform a certain operation. It's a tedious process, but necessary in many circumstances where you are actually instructing the GPU to perform some computation (just by calling a standard DirectX API in your code). The API will often just fail silently, or return an almost useless error code like, D3DERR_INVALIDCALL. Determining your Graphics card capabilities beforehand prevents this kind of thing.

Archy_Yu24-Oct-09 1:41

Re: My texture just didnot work! Anyone give a hand?

24-Oct-09 1:41

     unsigned int ID;                 /**< 生成纹理的ID号 */
   int imageWidth;                  /**< 图像宽度 */
   int imageHeight;                 /**< 图像高度 */
   unsigned char *image;            /**< 指向图像数据的指针 */
     FILE *pFile = 0;


 BITMAPINFOHEADER bitmapInfoHeader;
 BITMAPFILEHEADER header;

 unsigned char textureColors = 0;

 pFile = fopen("桌面.bmp", "rb");
     if(pFile == 0) return false;

 fread(&header, sizeof(BITMAPFILEHEADER), 1, pFile);

 if(header.bfType != BITMAP_ID)
    {
        fclose(pFile);
        return false;
    }

 fread(&bitmapInfoHeader, sizeof(BITMAPINFOHEADER), 1, pFile);

 imageWidth = bitmapInfoHeader.biWidth;
 imageHeight = bitmapInfoHeader.biHeight;


if(bitmapInfoHeader.biSizeImage == 0)
   bitmapInfoHeader.biSizeImage = bitmapInfoHeader.biWidth *
   bitmapInfoHeader.biHeight * 3;


 fseek(pFile, header.bfOffBits, SEEK_SET);


 image = new unsigned char[bitmapInfoHeader.biSizeImage];


 fread(image, 1, bitmapInfoHeader.biSizeImage, pFile);


 for(int index = 0; index < (int)bitmapInfoHeader.biSizeImage; index+=3)
    {
        textureColors = image[index];
        image[index] = image[index + 2];
        image[index + 2] = textureColors;
    }

 fclose(pFile);
 glPixelStorei(GL_UNPACK_ALIGNMENT,1);

 glGenTextures(1, &ID);

 glBindTexture(GL_TEXTURE_2D, ID);

 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
 glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);

 gluBuild2DMipmaps(GL_TEXTURE_2D, 3, imageWidth,
                   imageHeight, GL_RGB, GL_UNSIGNED_BYTE,
                   image);

 glEnable(GL_TEXTURE_2D);
 glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_REPLACE);

 glPushMatrix();
 glScaled(45.0,30.0,0);
 glBindTexture(GL_TEXTURE_2D, ID);
 glBegin(GL_QUADS);
     glTexCoord2f(0.0f, 0.0f); glVertex3f(-2.0f, -1.0f, 0.0f);
     glTexCoord2f(1.0f, 0.0f); glVertex3f(-2.0f,  1.0f, 0.0f);
     glTexCoord2f(1.0f, 1.0f); glVertex3f( 0.0f,  1.0f, 0.0f);
     glTexCoord2f(0.0f, 1.0f); glVertex3f( 0.0f, -1.0f, 0.0f);

 glEnd();
 glPopMatrix();

GLvoid ReShapeGLScene( GLsizei width,GLsizei height )
{
glViewport(0,0,(GLsizei)width,(GLsizei)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho((GLdouble)-450.0,(GLdouble)450.0,(GLdouble)-300.0,(GLdouble)300.0,50.0,-10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}

I think i must be somewhere wrong ,but i am not a expert,and cannot find it .The followings are some set about my code

static PIXELFORMATDESCRIPTOR  pfd =
	{
		sizeof(PIXELFORMATDESCRIPTOR),
			1,
			PFD_DRAW_TO_WINDOW|
			PFD_SUPPORT_OPENGL|
			PFD_DOUBLEBUFFER,
			PFD_TYPE_RGBA,
			24,
			0,0,0,0,0,0,
			0,
			0,
			0,
			0,0,0,0,
			32,
			0,
			0,
			PFD_MAIN_PLANE,
			0,
			0,0,0			
	};

thanks advance

IdUnknown26-Oct-09 3:22

IdUnknown

26-Oct-09 3:22

For the PIXELFORMATDESCRIPTOR you set the pixel type to PFD_TYPE_RGBA so i think you need to set the colorbits to 32 instead of 24.

And for the mipmaps

gluBuild2DMipmaps(GL_TEXTURE_2D, 3, imageWidth, imageHeight, GL_RGB, GL_UNSIGNED_BYTE, image);

try this instead

gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, imageWidth, imageHeight, GL_RGBA, GL_UNSIGNED_BYTE, image);

or

gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, imageWidth, imageHeight, GL_BGRA, GL_UNSIGNED_BYTE, image);

notice the fifth parameter. This is what I use for loading Windows bitmap into texture.

Re: My texture just didnot work! Anyone give a hand?

Archy_Yu26-Oct-09 4:49

Re: My texture just didnot work! Anyone give a hand?

26-Oct-09 4:49

not work,The program work well in others' computer,But failed again in my computer.

My gpu is nViDIA, geforce G210M.

I think it something with my gpu.

But I knouw nothing about it

Thanks all the same

Tim Craig26-Oct-09 7:41

Re: My texture just didnot work! Anyone give a hand?

26-Oct-09 7:41

What size is the image you're trying to use as a texture? I haven't played with OpenGL for a bit but I seem to remember the image has to be sized to even powers of 2. For example, 2, 4, 8, 16, 32....

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

Archy_Yu26-Oct-09 20:11

Choose correct pixel (Intertesting problem)

26-Oct-09 20:11

64.

Grayscale values

econner21-Oct-09 20:32

econner

21-Oct-09 20:32

I have a third party dll that is written in C++ that saves a bitmap image as the actual grayscale values and not a Bitmap format. I am looking for a way to read in the grayscale values and convert them to use C#/.NET 's Bitmap class.

Thanks

Re: Grayscale values

ely_bob27-Oct-09 5:22

ely_bob

27-Oct-09 5:22

I'm guessing you mean something like :

file: 256, 0,0 ,12,25,89.. val_n.. etc...EOF (for a 16X16 image)

then the easiest way (C#) is to read the values into program then create a bitmap and read the values into pixels as:

Bitmap.SetPixel(X,Y, Color.FromRGB(val_n,val_n,val_n));

iterate and save bitmap done.

mah_pankaj20-Oct-09 16:12

mah_pankaj

20-Oct-09 16:12

I have a problem when two images are overlapping in a area. Then I have to draw both the images side by side in such a way that they seems to be merging. I am drawing first image and then second image on same memory buffer. Now my problem is how to determine which pixel to draw (old Image/new Image). As to show merging I don't want to overwrite all the pixels of old image with new image. I have four color to play with.(ForeColor, BackColor, Old Memory Buffer Color, New Memory Buffer Color). All the images are color and using grayScale Alpha blending on edges so we will have lots of different color pixel in one image specially on edges. I hope some of graphics designer must have face this problem. Please let me know the approach or some algo to decide. Currently I am using one method to check the new memory color and old memory color distance from foreground color and printing the closer one. Also I did same with background color and printing which is far from background color. These are failing some time specially if I choose foreground and background color same.(Condition :-Main part of both Picture must be using foreground color as this is character text and that part should not be overwritten.).

Thanks in advance.

Tim Craig20-Oct-09 19:27

20-Oct-09 19:27

The general problem is called "image stitching" and a lot of software exists to handle stitching photographs into panoramic views. It sounds like your case is less general but the procedures probably are similar.

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

mah_pankaj21-Oct-09 0:47

mah_pankaj

21-Oct-09 0:47

Thanks Tim.
This information helped me to find related stuff. But my problem is specially with same foreground and background color. You can think I have some text and each character is surrounded by clouds. Now I need to print these correctly rendered text in buffer so that surrounding cloud of text should be evenly overlapped but it should not overwrite the main text. My problem is mainly with same background and foreground color. Also my current code is very simple and I don't want to use any complex function(which is most of filters are doing) to get the correct pixel.

Tim Craig21-Oct-09 6:06

21-Oct-09 6:06

Ok, I think I understand your problem a bit better now. Is your text in any kind of regular pattern so that you can use OCR techniques to identify the margins and rows? If so, alignment of the text would be easy based on your layout rules. If there's something special about the background that also needs to be aligned somehow and it's fairly uniform, this sounds more like the problem of finding the back cat in the coal bin at midnight. Smile | :)

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.