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Multitexturing and Register Combiners

Started by opengl_coder Jan 27, 2003 at 7:11 PM 4 replies 550+ views

Original Post

Jan 27, 2003 at 7:11 PM

Hello, guys! I''m trying to learn more about Multitexturing and Register combiners. I want to use 3 multitexture units, my graphics card has 4. But when I use this method only textures 2 are visible, why? GL_TEXTURE0_ARB visible. GL_TEXTURE1_ARB visible. GL_TEXTURE2_ARB not visible. //active texture 1 (the 1D radial ramp texture) glActiveTextureARB(GL_TEXTURE1_ARB); glEnable(GL_TEXTURE_1D); glBindTexture(GL_TEXTURE_1D, ZtextureID); //active texture 0 (the 2D radial map texture) glActiveTextureARB(GL_TEXTURE0_ARB); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, XYtextureID); //This one is not visible??? glActiveTextureARB(GL_TEXTURE2_ARB); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, TexArray[0]); //setup and enable the register combiners glCombinerParameteriNV(GL_NUM_GENERAL_COMBINERS_NV, 1); glCombinerParameterfvNV(GL_CONSTANT_COLOR0_NV, (float*)&color); glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_A_NV, GL_TEXTURE0_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB); glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB); glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE1_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB); glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_RGB); glCombinerOutputNV(GL_COMBINER0_NV, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV, GL_SPARE0_NV, GL_NONE, GL_NONE, GL_FALSE, GL_FALSE, GL_FALSE); glFinalCombinerInputNV(GL_VARIABLE_A_NV, GL_SPARE0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB); glFinalCombinerInputNV(GL_VARIABLE_B_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB); glFinalCombinerInputNV(GL_VARIABLE_C_NV, GL_CONSTANT_COLOR0_NV, GL_UNSIGNED_IDENTITY_NV, GL_RGB); glFinalCombinerInputNV(GL_VARIABLE_D_NV, GL_ZERO, GL_UNSIGNED_IDENTITY_NV, GL_RGB); glFinalCombinerInputNV(GL_VARIABLE_G_NV, GL_ZERO, GL_UNSIGNED_INVERT_NV, GL_ALPHA); glEnable(GL_REGISTER_COMBINERS_NV); cheers opengl_coder

zedzeek

Jan 27, 2003 at 10:51 PM

im surprised u see any textures at all u should only be seeing GL_CONSTANT_COLOR0_NV

edit my bad u will see tex0 * tex1 * constant color

also texture2 might be bound but youre not using in the regcombine method

check out a register combiners pdf from nvidia theyre pretty thorough

http://uk.geocities.com/sloppyturds/kea/kea.html
http://uk.geocities.com/sloppyturds/gotterdammerung.html

[edited by - zedzeek on January 27, 2003 11:57:56 PM]

opengl_coder

Jan 28, 2003 at 6:26 PM

Thank you zedzeek.

What I want to do is create a per-pixel poinlight.
I use tex0 for my 1D texture, tex1 for my 2D texture and tex2 for my "normal" texture.

But I don''t know how to set up my register combiners..

zedzeek

Jan 28, 2003 at 11:17 PM

check here
http://users.ox.ac.uk/~univ1234/index.htm
paul has described a few different methods

http://uk.geocities.com/sloppyturds/kea/kea.html
http://uk.geocities.com/sloppyturds/gotterdammerung.html

CnCMasta

Jan 29, 2003 at 8:51 AM

put this in the right block:
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);

mfg cNc

opengl_coder

Jan 30, 2003 at 9:24 AM

I tried to add the
glCombinerInputNV(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_C_NV, GL_TEXTURE2_ARB, GL_UNSIGNED_IDENTITY_NV, GL_RGB);

but it did't look correct..

Does anybody know how to use the method in Ron Fraziers Per-pixel tutorial without rendring two times and using blending?

[edited by - opengl_coder on January 30, 2003 10:25:42 AM]

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