Function d3d_SetMultiTextureBlendMode

legacy/renderer/Direct3D.cpp:1836–1855

Turns on/off multitexture blending

// Turns on/off multitexture blending
void d3d_SetMultiTextureBlendMode(bool state) {
  if (D3D_multitexture_state == state && D3D_bumpmap_state == 0)
    return;

  D3D_multitexture_state = state;
  D3D_bumpmap_state = 0;

  if (state) {
    if (Overlay_type == OT_BLEND_SATURATE) {
      lpD3DDevice->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_ADD);
      lpD3DDevice->SetTextureStageState(1, D3DTSS_ALPHAOP, D3DTOP_ADD);
    } else {
      lpD3DDevice->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_MODULATE);
      lpD3DDevice->SetTextureStageState(1, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
    }
  } else {
    lpD3DDevice->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_DISABLE);
    lpD3DDevice->SetTextureStageState(1, D3DTSS_ALPHAOP, D3DTOP_DISABLE);
  }
}

struct FlatVertex {
  float x, y, z;