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Creating a OpenGL texture from a resorce file

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Started by Gandalf June 20, 2000 07:08 AM

6 comments, last by Gandalf 24 years ago

Gandalf

122

Author

June 20, 2000 07:08 AM

Hey, GL Wizards! I need help with creating a OpenGL texture from a bitmap loaded from resoure file.

                                                    

void CreateResTextures()
{
    // bits needed to create a 256x256 24 bits bitmap

    const int iNrBits = 256*256*3;


    // Load bitmap from resource file

    HBITMAP bitmap = LoadBitmap(GetModuleHandle(NULL), 
        MAKEINTRESOURCE(IDB_BITMAP));


    // Allocate bitmap data

    unsigned char *data = new unsigned char[iNrBits];


    // Get bitmap data from handle

    GetBitmapBits(bitmap, iNrBits, data);


    // Create one texture

    glGenTextures(1, &m_texture[0]);


    // Bind name to texture

    glBindTexture(GL_TEXTURE_2D, m_texture[0]);

	
    // Generate the texture

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 256, 256, 
		0, GL_RGB, GL_UNSIGNED_BYTE, data);


   delete data;
}

The pixels in the image is not on correct positions. But I think that all the colors is correct. Only half texture shows up. Somebody of you must have loaded a bitmap from a resource file and used it as a texture

Gandalf the White
Edited by - Gandalf on 6/20/00 7:30:12 AM

Gandalf the Black

Demon Lord

122

June 20, 2000 12:16 PM

I''m sorry not to be able to answer you question, but how do you do this cool IDE-like code formatting ? Do you use any special proggie or type everything by hand ? It is so... clear !

EL

----------------------------------------"Inash neteia haeg joa kavari quilm..." SD4

126

June 21, 2000 02:22 PM

    You make the IDE - like code windows with [ source ] (don''t write the spaces)

Visit our homepage: www.rarebyte.de.st

GA

Visit our homepage: www.rarebyte.de.stGA

baskuenen

124

June 21, 2000 02:32 PM

I''m using 24bits uncompressed 256x256 TGA images.
Maybe a bit big...but compression is a thing of the last minute.
And it''s very easy to use, no loss of data...

Anyway here''s the source:

    	PIXEL Texture[256*256];	typedef struct	{	char	CompressionHeader[12];		WORD	Width;		WORD	Height;		WORD	BitsPerPixel;		unsigned char Data[1];	}	TGAHEADER, *PTGAHEADER;	void *pResTexture = LockResource(LoadResource(NULL, FindResource(NULL, MAKEINTRESOURCE(IDT_TEXTURE), "TGA")));	unsigned char *pTexture = ((PTGAHEADER)pResTexture)->Data;	for(int j=0; j<256; j++)	for(int i=0; i<256; i++)	{	Texture[(255-j)*256 + i].b = *pTexture++;		Texture[(255-j)*256 + i].g = *pTexture++;		Texture[(255-j)*256 + i].r = *pTexture++;	}	glTexImage2D(GL_TEXTURE_2D, 0, 3, 256, 256, 0, GL_RGB, GL_UNSIGNED_BYTE, Texture);

Gandalf

122

Author

June 22, 2000 04:11 AM

Thank you very much!

But I have 2 questions for you:

1. PIXEL? What lib and header is needed to find this structure?
2. Can Paintshop save TGA files?

Gandalf the White

Gandalf the Black

Magallo

122

June 22, 2000 06:28 AM

Sorry, only a try

    #include<stdio.h>void main(){   printf("Hello, world!\n");}

Does it work ?

How to close the source tag ?

SKSlayer

122

June 22, 2000 10:13 AM

Are you sure the texture coordinates are correct ?

(you can find me on IRC : #opengl on undernet)

Gandalf

122

Author

June 22, 2000 11:02 AM

Yes I am, and that problem is already solved now.
Thanks anyway.

Gandalf the White

Gandalf the Black

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Creating a OpenGL texture from a resorce file

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🎉 Celebrating 25 Years of GameDev.net! 🎉

Creating a OpenGL texture from a resorce file

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