/// <summary>
/// Internal method returns whether required capabilities for this program is supported.
/// </summary>
protected bool AreRequiredCapabilitiesSupported()
{
HardwareCaps caps = Root.Instance.RenderSystem.Caps;
// If skeletal animation is being done, we need support for UBYTE4
if (this.IsSkeletalAnimationIncluded &&
!caps.CheckCap(Capabilities.VertexFormatUByte4))
{
return(false);
}
// Vertex texture fetch required?
if (vertexTextureFetchRequired && !caps.CheckCap(Capabilities.VertexTextureFetch))
{
return(false);
}
return(true);
}
/// <summary>
/// Compilation method for Techniques. See <see cref="Axiom.Core.Material"/>
/// </summary>
/// <param name="autoManageTextureUnits">
/// Determines whether or not the engine should split up extra texture unit requests
/// into extra passes if the hardware does not have enough available units.
/// </param>
internal string Compile(bool autoManageTextureUnits)
{
string compileErrors;
// assume not supported unless it proves otherwise
isSupported = false;
// grab a ref to the current hardware caps
HardwareCaps caps = Root.Instance.RenderSystem.Caps;
int numAvailTexUnits = caps.TextureUnitCount;
// check requirements for each pass
for (int i = 0; i < passes.Count; i++)
{
Pass pass = (Pass)passes[i];
bool tooManyTextures = false;
int numTexUnitsRequested = pass.NumTextureUnitStages;
if (pass.HasFragmentProgram)
{
// check texture units
// check fragment program version
if (!pass.FragmentProgram.IsSupported)
{
// can't do this one
tooManyTextures = true;
}
else
{
numAvailTexUnits = pass.FragmentProgram.SamplerCount;
if (numTexUnitsRequested > numAvailTexUnits)
{
// can't do this, since programmable passes cannot be split automatically
tooManyTextures = true;
}
}
}
else
{
if (numTexUnitsRequested > numAvailTexUnits)
{
if (!autoManageTextureUnits)
{
tooManyTextures = true;
}
else if (pass.HasVertexProgram)
{
tooManyTextures = true;
}
}
if (tooManyTextures)
{
// Can't do this one
compileErrors = "Pass " + i +
": Too many texture units for the current hardware and " +
"cannot split programmable passes.";
return(compileErrors);
}
}
if (pass.HasVertexProgram)
{
// Check vertex program version
if (!pass.VertexProgram.IsSupported)
{
// Can't do this one
compileErrors = "Pass " + i +
": Vertex program " + pass.VertexProgram.Name +
" cannot be used - ";
if (pass.VertexProgram.HasCompileError)
{
compileErrors += "compile error.";
}
else
{
compileErrors += "not supported.";
}
return(compileErrors);
}
}
if (pass.HasFragmentProgram)
{
// check texture units
// check fragment program version
if (!pass.FragmentProgram.IsSupported)
{
// can't do this one
compileErrors = "Pass " + i +
": Fragment program " + pass.FragmentProgram.Name +
" cannot be used - ";
if (pass.FragmentProgram.HasCompileError)
{
compileErrors += "compile error.";
}
else
{
compileErrors += "not supported.";
}
return(compileErrors);
}
}
else
{
// check support for a few fixed function options while we are here
for (int j = 0; j < pass.NumTextureUnitStages; j++)
{
TextureUnitState texUnit = pass.GetTextureUnitState(j);
// check to make sure we have some cube mapping support
if (texUnit.Is3D && !caps.CheckCap(Capabilities.CubeMapping))
{
compileErrors = "Pass " + i + " Tex " + texUnit +
": Cube maps not supported by current environment.";
return(compileErrors);
}
// Any 3D textures? NB we make the assumption that any
// card capable of running fragment programs can support
// 3D textures, which has to be true, surely?
if (texUnit.TextureType == TextureType.ThreeD && !caps.CheckCap(Capabilities.Texture3D))
{
// Fail
compileErrors = "Pass " + i + " Tex " + texUnit +
": Volume textures not supported by current environment.";
return(compileErrors);
}
// if this is a Dot3 blending layer, make sure we can support it
if (texUnit.ColorBlendMode.operation == LayerBlendOperationEx.DotProduct && !caps.CheckCap(Capabilities.Dot3))
{
compileErrors = "Pass " + i + " Tex " + texUnit +
": DOT3 blending not supported by current environment.";
return(compileErrors);
}
}
// keep splitting until the texture units required for this pass are available
// Note: Split will call Technique.CreatePass,
// which adds the new pass to the end of the list
// of passes. Is that always the right behavior?
while (numTexUnitsRequested > numAvailTexUnits)
{
// split this pass up into more passes
pass = pass.Split(numAvailTexUnits);
numTexUnitsRequested = pass.NumTextureUnitStages;
}
}
} // for
// if we made it this far, we are good to go!
isSupported = true;
// CompileIlluminationPasses() used to be called here, but it is now done on
// demand since it the illumination passes are only needed for additive shadows
// and we (multiverse) don't use them.
// Now compile for categorised illumination, in case we need it later
// Compile for categorised illumination on demand
ClearIlluminationPasses();
illuminationPassesCompilationPhase = IlluminationPassesState.NotCompiled;
return("");
}