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Texture-Multitexture , complex

Started by dawidjoubert Dec 15, 2005 at 12:55 PM 2 replies 850+ views

Original Post

Dec 15, 2005 at 12:55 PM

Hi there, Im using Multitexturing with 4 units. I currently have this config for the blending Base = 100% Cliff = RGB Detail = ALPHA Lightmap = ALPHA I would like to have Base = 100% Cliff = R Detail = G Lightmap = B Can any1 help me set this up, is it possible? Here is how i set the Detial/light map

[Source]
		glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
		glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_INTERPOLATE_ARB);

		glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_PREVIOUS_ARB);
		glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);

		glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_TEXTURE);
		glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);

		glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_PRIMARY_COLOR_ARB);
		glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);
[/Source]

And here is how i set the cliff texture

[Source]
glActiveTextureARB(GL_TEXTURE1_ARB);
		glEnable(GL_TEXTURE_2D);
		glBindTexture(GL_TEXTURE_2D,CliffTexture);

		glMatrixMode(GL_TEXTURE);
		glLoadIdentity();
		glScalef(0.15f,0.15f,0.15f);

		glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
		glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_INTERPOLATE_ARB);

		glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_PREVIOUS_ARB);
		glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);

		glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_TEXTURE);
		glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);

		glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_PRIMARY_COLOR_ARB);
		glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_COLOR);
[/Source]

Now all i want to do is set them at the end instead of GL_SRC_COLOR to GL_SCR_COLOR_RED or GL_SOURCE_COLOR_BLUE and so on. Is this possible? If not can i set a main colour multiplier which changes the lighting of the object?

Unreal

Dec 15, 2005 at 1:34 PM

this days I was searching for the same thing.
You can not access individual channels of the texture unless you use a pixel shader. (or maybe some other Vendor specific extension.. dunno!)

dawidjoubert

Author

dawidjoubert

Dec 15, 2005 at 3:07 PM

Thanks alot, that just sucks.. I think its the first limitation of OpenGL that i have reached without looking into Cg..

Guess Cg is the way to go huh?
Well anyways i think i will look towards a lightmap (texture) then. Thanks :-)

bluntman

Dec 16, 2005 at 6:31 AM

I would say if you are sticking to OpenGL then GLSL is at least as good a choice as Cg, as it is fully supported without the need for any extra API or DLLs.
I started trying to use Cg, but the syntax and API for GLSL just makes alot more sense to me after using OpenGL for so long.

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