source/core/stenciltest.h

   1 #ifndef MSP_GL_STENCILTEST_H_
   2 #define MSP_GL_STENCILTEST_H_
   3
   4 #include <msp/datafile/objectloader.h>
   5 #include <msp/strings/lexicalcast.h>
   6 #include "predicate.h"
   7
   8 namespace Msp {
   9 namespace GL {
  10
  11 enum StencilOp: std::uint8_t
  12 {
  13         KEEP,
  14         SET_ZERO,
  15         REPLACE,
  16         INCR_CLAMP,
  17         DECR_CLAMP,
  18         INVERT,
  19         INCR_WRAP,
  20         DECR_WRAP
  21 };
  22
  23 /**
  24 Tests values in the stencil buffer against a reference.  If the test fails, the
  25 incoming fragment is discarded.  The stencil buffer may be modified according
  26 to results of the stencil test and the depth test.
  27 */
  28 struct StencilTest
  29 {
  30         class Loader: public DataFile::ObjectLoader<StencilTest>
  31         {
  32         public:
  33                 Loader(StencilTest &);
  34
  35         private:
  36                 void compare(Predicate);
  37                 void actions(StencilOp, StencilOp, StencilOp);
  38         };
  39
  40         bool enabled = false;
  41         Predicate compare = ALWAYS;
  42         StencilOp stencil_fail_op = KEEP;
  43         StencilOp depth_fail_op = KEEP;
  44         StencilOp depth_pass_op = KEEP;
  45         unsigned reference = 0;
  46
  47         bool operator==(const StencilTest &) const;
  48         bool operator!=(const StencilTest &s) const { return !operator==(s); }
  49 };
  50
  51 inline bool StencilTest::operator==(const StencilTest &other) const
  52 {
  53         return enabled==other.enabled && compare==other.compare && stencil_fail_op==other.stencil_fail_op &&
  54                 depth_fail_op==other.depth_fail_op && depth_pass_op==other.depth_pass_op && reference==other.reference;
  55 }
  56
  57 void operator>>(const LexicalConverter &, StencilOp &);
  58 void operator<<(LexicalConverter &, StencilOp);
  59
  60 } // namespace GL
  61 } // namespace Msp
  62
  63 #include "stenciltest_backend.h"
  64
  65 #endif