/// <summary>
/// Lazily computes derived parameter values immediately before applying the effect.
/// </summary>
protected override void OnApply()
{
// Recompute the world+view+projection matrix or fog vector?
dirtyFlags = EffectHelpers.SetWorldViewProjAndFog(dirtyFlags, ref world, ref view, ref projection, ref worldView, fogEnabled, fogStart, fogEnd, worldViewProjParam, fogVectorParam);
// Recompute the diffuse/alpha material color parameter?
if ((dirtyFlags & EffectDirtyFlags.MaterialColor) != 0)
{
diffuseColorParam.SetValue(new Vector4(diffuseColor * alpha, alpha));
dirtyFlags &= ~EffectDirtyFlags.MaterialColor;
}
// Recompute the shader index?
if ((dirtyFlags & EffectDirtyFlags.ShaderIndex) != 0)
{
int shaderIndex = 0;
if (!fogEnabled)
{
shaderIndex += 1;
}
if (vertexColorEnabled)
{
shaderIndex += 2;
}
shaderIndexParam.SetValue(shaderIndex);
dirtyFlags &= ~EffectDirtyFlags.ShaderIndex;
}
}
/// <summary>
/// Lazily computes derived parameter values immediately before applying the effect.
/// </summary>
protected override void OnApply()
{
// Recompute the world+view+projection matrix or fog vector?
dirtyFlags = EffectHelpers.SetWorldViewProjAndFog(dirtyFlags, ref world, ref view, ref projection, ref worldView, fogEnabled, fogStart, fogEnd, worldViewProjParam, fogVectorParam);
// Recompute the world inverse transpose and eye position?
dirtyFlags = EffectHelpers.SetLightingMatrices(dirtyFlags, ref world, ref view, worldParam, worldInverseTransposeParam, eyePositionParam);
// Recompute the diffuse/emissive/alpha material color parameters?
if ((dirtyFlags & EffectDirtyFlags.MaterialColor) != 0)
{
EffectHelpers.SetMaterialColor(true, alpha, ref diffuseColor, ref emissiveColor, ref ambientLightColor, diffuseColorParam, emissiveColorParam);
dirtyFlags &= ~EffectDirtyFlags.MaterialColor;
}
// Check if we can use the only-bother-with-the-first-light shader optimization.
bool newOneLight = !light1.Enabled && !light2.Enabled;
if (oneLight != newOneLight)
{
oneLight = newOneLight;
dirtyFlags |= EffectDirtyFlags.ShaderIndex;
}
// Recompute the shader index?
if ((dirtyFlags & EffectDirtyFlags.ShaderIndex) != 0)
{
int shaderIndex = 0;
if (!fogEnabled)
{
shaderIndex += 1;
}
if (weightsPerVertex == 2)
{
shaderIndex += 2;
}
else if (weightsPerVertex == 4)
{
shaderIndex += 4;
}
if (preferPerPixelLighting)
{
shaderIndex += 12;
}
else if (oneLight)
{
shaderIndex += 6;
}
shaderIndexParam.SetValue(shaderIndex);
dirtyFlags &= ~EffectDirtyFlags.ShaderIndex;
}
}
/// <summary>
/// Sets up the standard key/fill/back lighting rig.
/// </summary>
public void EnableDefaultLighting()
{
LightingEnabled = true;
AmbientLightColor = EffectHelpers.EnableDefaultLighting(light0, light1, light2);
}
/// <summary>
/// Lazily computes derived parameter values immediately before applying the effect.
/// </summary>
protected override void OnApply()
{
// Recompute the world+view+projection matrix or fog vector?
dirtyFlags = EffectHelpers.SetWorldViewProjAndFog(dirtyFlags, ref world, ref view, ref projection, ref worldView, fogEnabled, fogStart, fogEnd, worldViewProjParam, fogVectorParam);
// Recompute the diffuse/alpha material color parameter?
if ((dirtyFlags & EffectDirtyFlags.MaterialColor) != 0)
{
diffuseColorParam.SetValue(new Vector4(diffuseColor * alpha, alpha));
dirtyFlags &= ~EffectDirtyFlags.MaterialColor;
}
// Recompute the alpha test settings?
if ((dirtyFlags & EffectDirtyFlags.AlphaTest) != 0)
{
Vector4 alphaTest = new Vector4();
bool eqNe = false;
// Convert reference alpha from 8 bit integer to 0-1 float format.
float reference = (float)referenceAlpha / 255f;
// Comparison tolerance of half the 8 bit integer precision.
const float threshold = 0.5f / 255f;
switch (alphaFunction)
{
case CompareFunction.Less:
// Shader will evaluate: clip((a < x) ? z : w)
alphaTest.X = reference - threshold;
alphaTest.Z = 1;
alphaTest.W = -1;
break;
case CompareFunction.LessEqual:
// Shader will evaluate: clip((a < x) ? z : w)
alphaTest.X = reference + threshold;
alphaTest.Z = 1;
alphaTest.W = -1;
break;
case CompareFunction.GreaterEqual:
// Shader will evaluate: clip((a < x) ? z : w)
alphaTest.X = reference - threshold;
alphaTest.Z = -1;
alphaTest.W = 1;
break;
case CompareFunction.Greater:
// Shader will evaluate: clip((a < x) ? z : w)
alphaTest.X = reference + threshold;
alphaTest.Z = -1;
alphaTest.W = 1;
break;
case CompareFunction.Equal:
// Shader will evaluate: clip((abs(a - x) < Y) ? z : w)
alphaTest.X = reference;
alphaTest.Y = threshold;
alphaTest.Z = 1;
alphaTest.W = -1;
eqNe = true;
break;
case CompareFunction.NotEqual:
// Shader will evaluate: clip((abs(a - x) < Y) ? z : w)
alphaTest.X = reference;
alphaTest.Y = threshold;
alphaTest.Z = -1;
alphaTest.W = 1;
eqNe = true;
break;
case CompareFunction.Never:
// Shader will evaluate: clip((a < x) ? z : w)
alphaTest.Z = -1;
alphaTest.W = -1;
break;
case CompareFunction.Always:
default:
// Shader will evaluate: clip((a < x) ? z : w)
alphaTest.Z = 1;
alphaTest.W = 1;
break;
}
alphaTestParam.SetValue(alphaTest);
dirtyFlags &= ~EffectDirtyFlags.AlphaTest;
// If we changed between less/greater vs. equal/notequal
// compare modes, we must also update the shader index.
if (isEqNe != eqNe)
{
isEqNe = eqNe;
dirtyFlags |= EffectDirtyFlags.ShaderIndex;
}
}
// Recompute the shader index?
if ((dirtyFlags & EffectDirtyFlags.ShaderIndex) != 0)
{
int shaderIndex = 0;
if (!fogEnabled)
{
shaderIndex += 1;
}
if (vertexColorEnabled)
{
shaderIndex += 2;
}
if (isEqNe)
{
shaderIndex += 4;
}
shaderIndexParam.SetValue(shaderIndex);
dirtyFlags &= ~EffectDirtyFlags.ShaderIndex;
}
}
