Feature #784: Make non power of 2 textures working - Ryzom - Ryzom Core Development Site

Feature #784

Make non power of 2 textures working

Added by kervala over 8 years ago. Updated almost 8 years ago.

Status:

Closed

Start date:

12/22/2009

Priority:

Normal

Due date:

Assignee:

kervala

% Done:

100%

Category:

NeL: General

Target version:

Version 0.8.0

Description

Currently, non-power of 2 textures (CTextureFile) are displayed as a default texture with a "2", but recent graphic cards are supporting them.

For OpenGL, we just need to check for GL_ARB_texture_non_power_of_two extension, if it's present, we can use texture which haven't a power of 2 size.

History

#1 Updated by kervala over 8 years ago

if (caps.TextureCaps & D3DPTEXTURECAPS_POW2)
{
    if(caps.TextureCaps & D3DPTEXTURECAPS_NONPOW2CONDITIONAL)
    {
        //But, in certain cases textures can ignore the power of 2 limitation
    }
}
else
{
    //Textures do not need to be a power of 2 in size
}

From D3D headers :

Device can use non-POW2 textures if:

1) D3DTEXTURE_ADDRESS is set to D3DTADDRESS_CLAMP for this texture's stage
2) D3DRS_WRAP(N) set to 0 for this texture's coordinates

PD3DDEVICE->SetRenderState(D3DRS_WRAP0, 0);
PD3DDEVICE->SetTextureStageState(0, D3DTSS_ADDRESSU, D3DTADDRESS_CLAMP);
PD3DDEVICE->SetTextureStageState(0, D3DTSS_ADDRESSV, D3DTADDRESS_CLAMP);
PD3DDEVICE->SetTextureStageState(0, D3DTSS_ADDRESSW, D3DTADDRESS_CLAMP);

3) mip mapping is not enabled (use magnification filter only)
4) Texture formats must not be DXT1-5

if (FAILED(PD3DDEVICE->CreateTexture(m_pTextureInfo[nFrame].nWidth, m_pTextureInfo[nFrame].nHeight, 1,
0, D3DFMT_A4R4G4B4, D3DPOOL_MANAGED, &m_pTextureInfo[nFrame].pTexture)))
return NULL;