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STENCILS.md

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105 lines (88 loc) · 3.4 KB

stencils

  • we are debugging concave stencil
  • concave fill

the default values are * stencilcompare function = always * and operations are keep for all * default masks as 0xffff_ffff

metal

  • convex_fill
    • no stencil
  • concave_fill

    • match cmd.fill_rule { FillRule::NonZero => { //gl::StencilFunc(gl::EQUAL, 0x0, 0xff), encoder.set_stencil_reference_value(0xff); } FillRule::EvenOdd => { // gl::StencilFunc(gl::EQUAL, 0x0, 0x1), encoder.set_stencil_reference_value(0x1); } }

    • fill_shape_stencil_state

    • FillRule::NonZero => { //gl::StencilFunc(gl::NOTEQUAL, 0x0, 0xff), encoder.set_stencil_reference_value(0xff); } FillRule::EvenOdd => { // gl::StencilFunc(gl::NOTEQUAL, 0x0, 0x1), encoder.set_stencil_reference_value(0x1); }

    • fill_stencil_state

  • stroke
    • no stencils
  • stencil_stroke
    • stroke_shape_stencil_state
    • stroke_anti_alias_stencil_state
    • stroke_clear_stencil_state
  • triangles
  • clear_rect

default_stencil_state



fill_shape_stencil_state


front_face_stencil_descriptor.set_stencil_compare_function(metal::MTLCompareFunction::Always);
front_face_stencil_descriptor.set_depth_stencil_pass_operation(metal::MTLStencilOperation::IncrementWrap);

back_face_stencil_descriptor.set_stencil_compare_function(metal::MTLCompareFunction::Always);
back_face_stencil_descriptor.set_depth_stencil_pass_operation(metal::MTLStencilOperation::DecrementWrap);

let stencil_descriptor = metal::DepthStencilDescriptor::new();
stencil_descriptor.set_depth_compare_function(metal::MTLCompareFunction::Always);
stencil_descriptor.set_back_face_stencil(Some(&back_face_stencil_descriptor));
stencil_descriptor.set_front_face_stencil(Some(&front_face_stencil_descriptor));


fill_anti_alias_stencil_state


// glstencilfunc(equal, _, 0)
// glstencilop(keep, keep, zero)
desc.set_stencil_compare_function(metal::MTLCompareFunction::Equal);
desc.set_stencil_failure_operation(metal::MTLStencilOperation::Keep);
desc.set_depth_failure_operation(metal::MTLStencilOperation::Keep);
desc.set_depth_stencil_pass_operation(metal::MTLStencilOperation::Zero);


fill_stencil_state


desc.set_stencil_compare_function(metal::MTLCompareFunction::NotEqual);
desc.set_stencil_failure_operation(metal::MTLStencilOperation::Zero);
desc.set_depth_failure_operation(metal::MTLStencilOperation::Zero);
desc.set_depth_stencil_pass_operation(metal::MTLStencilOperation::Zero);


stroke_shape_stencil_state


desc.set_stencil_compare_function(metal::MTLCompareFunction::Equal);
desc.set_stencil_failure_operation(metal::MTLStencilOperation::Keep);
desc.set_depth_failure_operation(metal::MTLStencilOperation::Keep);
desc.set_depth_stencil_pass_operation(metal::MTLStencilOperation::IncrementClamp);


stroke_anti_alias_stencil_state


desc.set_depth_stencil_pass_operation(metal::MTLStencilOperation::Keep);


stroke_clear_stencil_state


desc.set_stencil_compare_function(metal::MTLCompareFunction::Always);
desc.set_stencil_failure_operation(metal::MTLStencilOperation::Zero);
desc.set_depth_failure_operation(metal::MTLStencilOperation::Zero);
desc.set_depth_stencil_pass_operation(metal::MTLStencilOperation::Zero);


opengl