stencil.c File Reference

#include "glheader.h"
#include "imports.h"
#include "context.h"
#include "macros.h"
#include "stencil.h"
#include "mtypes.h"

Go to the source code of this file.

Functions
static GLboolean	validate_stencil_op (GLcontext *ctx, GLenum op)
static GLboolean	validate_stencil_func (GLcontext *ctx, GLenum func)
void GLAPIENTRY	_mesa_ClearStencil (GLint s)
void GLAPIENTRY	_mesa_StencilFuncSeparateATI (GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask)
void GLAPIENTRY	_mesa_StencilFunc (GLenum func, GLint ref, GLuint mask)
void GLAPIENTRY	_mesa_StencilMask (GLuint mask)
void GLAPIENTRY	_mesa_StencilOp (GLenum fail, GLenum zfail, GLenum zpass)
void GLAPIENTRY	_mesa_StencilOpSeparate (GLenum face, GLenum sfail, GLenum zfail, GLenum zpass)
void GLAPIENTRY	_mesa_StencilFuncSeparate (GLenum face, GLenum func, GLint ref, GLuint mask)
void GLAPIENTRY	_mesa_StencilMaskSeparate (GLenum face, GLuint mask)
void	_mesa_update_stencil (GLcontext *ctx)
void	_mesa_init_stencil (GLcontext *ctx)

---

Detailed Description

Stencil operations.

Note: There's some conflict between GL_EXT_stencil_two_side and OpenGL 2.0's two-sided stencil feature.

With GL_EXT_stencil_two_side, calling glStencilOp/Func/Mask() only the front OR back face state (as set by glActiveStencilFaceEXT) is set.

But with OpenGL 2.0, calling glStencilOp/Func/Mask() sets BOTH the front AND back state.

Also, note that GL_ATI_separate_stencil is different as well: glStencilFuncSeparateATI(GLenum frontfunc, GLenum backfunc, ...) vs. glStencilFuncSeparate(GLenum face, GLenum func, ...).

This problem is solved by keeping three sets of stencil state: state[0] = GL_FRONT state. state[1] = OpenGL 2.0 / GL_ATI_separate_stencil GL_BACK state. state[2] = GL_EXT_stencil_two_side GL_BACK state.

Definition in file stencil.c.