/** Finds the location / index of the fragment data specified
* by @p identifier in a @p program. If active_only is true then
* throws if no such fragment data output exists or if it is not active.
*
* @glsymbols
* @glfunref{GetFragDataLocation}
*/
static GLint GetLocation(
ProgramName program,
StrCRef identifier,
bool active_only
)
{
GLint result = OGLPLUS_GLFUNC(GetFragDataLocation)(
GetGLName(program),
identifier.c_str()
);
OGLPLUS_CHECK(
GetFragDataLocation,
ProgVarError,
Program(program).
Identifier(identifier)
);
OGLPLUS_HANDLE_ERROR_IF(
active_only && (result < 0),
GL_INVALID_OPERATION,
MsgGettingInactive(),
ProgVarError,
Program(program).
Identifier(identifier)
);
return result;
}
/** Finds the location of the subroutine uniform specified
* by @p identifier in a @p program. If active_only is true then
* throws if no such subroutine exists or if it is not active.
*
* @glsymbols
* @glfunref{GetSubroutineUniformLocation}
*/
static GLint GetLocation(
ProgramName program,
ShaderType stage,
StrCRef identifier,
bool active_only) {
GLint result = OGLPLUS_GLFUNC(GetSubroutineUniformLocation)(
GetGLName(program), GLenum(stage), identifier.c_str());
OGLPLUS_CHECK(
GetSubroutineUniformLocation,
ProgVarError,
Program(program).Identifier(identifier).EnumParam(stage));
OGLPLUS_HANDLE_ERROR_IF(
active_only && (result < 0),
GL_INVALID_OPERATION,
MsgGettingInactive(),
ProgVarError,
Program(program).Identifier(identifier).EnumParam(stage));
return result;
}
/** Finds the location / index of the subroutine specified
* by @p identifier in the @p stage of a @p program. If active_only
* is true then throws if no such subroutine exists or if it is
* not active.
*
* @glsymbols
* @glfunref{GetSubroutineIndex}
*/
static GLint GetLocation(
ProgramName program,
ShaderType stage,
StrCRef identifier,
bool active_only) {
GLuint result = OGLPLUS_GLFUNC(GetSubroutineIndex)(
GetGLName(program), GLenum(stage), identifier.c_str());
OGLPLUS_CHECK(
GetSubroutineIndex,
ProgVarError,
Program(program).Identifier(identifier).EnumParam(stage));
OGLPLUS_HANDLE_ERROR_IF(
active_only && (result == GL_INVALID_INDEX),
GL_INVALID_OPERATION,
MsgGettingInactive(),
ProgVarError,
Program(program).Identifier(identifier).EnumParam(stage));
if(result == GL_INVALID_INDEX) {
return -1;
}
return GLint(result);
}
