STENCIL_OP StencilOpFromString(const char* str)
{
if (!str)
return STENCIL_OP_KEEP;
for (int i = 1; i <= 8; ++i)
{
if (_stricmp(str, STR_STENCIL_OP[i - 1]) == 0)
return STENCIL_OP(i);
}
Logger::Log(FB_ERROR_LOG_ARG, FormatString("%s is not valid StencilOp", str).c_str());
return STENCIL_OP_KEEP;
}
/**
* Apply the given stencil operator to the array of stencil values.
* Don't touch stencil[i] if mask[i] is zero.
* @param n number of stencil values
* @param oper the stencil buffer operator
* @param face 0 or 1 for front or back face operation
* @param stencil array of stencil values (in/out)
* @param mask array [n] of flag: 1=apply operator, 0=don't apply operator
* @param stride stride between stencil values
*/
static void
apply_stencil_op(const struct gl_context *ctx, GLenum oper, GLuint face,
GLuint n, GLubyte stencil[], const GLubyte mask[],
GLint stride)
{
const GLubyte ref = ctx->Stencil.Ref[face];
const GLubyte wrtmask = ctx->Stencil.WriteMask[face];
const GLubyte invmask = (GLubyte) (~wrtmask);
GLuint i, j;
switch (oper) {
case GL_KEEP:
/* do nothing */
break;
case GL_ZERO:
/* replace stencil buf values with zero */
STENCIL_OP(0);
break;
case GL_REPLACE:
/* replace stencil buf values with ref value */
STENCIL_OP(ref);
break;
case GL_INCR:
/* increment stencil buf values, with clamping */
STENCIL_OP(clamp(s + 1));
break;
case GL_DECR:
/* increment stencil buf values, with clamping */
STENCIL_OP(clamp(s - 1));
break;
case GL_INCR_WRAP_EXT:
/* increment stencil buf values, without clamping */
STENCIL_OP(s + 1);
break;
case GL_DECR_WRAP_EXT:
/* increment stencil buf values, without clamping */
STENCIL_OP(s - 1);
break;
case GL_INVERT:
/* replace stencil buf values with inverted value */
STENCIL_OP(~s);
break;
default:
_mesa_problem(ctx, "Bad stencil op in apply_stencil_op");
}
}
