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Add glsl_type::get_instance method

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Gets the singleton corresponding to a particular scalar, vector, or
matrix type.
This commit is contained in:
Ian Romanick 2010-03-24 17:11:30 -07:00
parent 60b54d977a
commit 3209c4e369
2 changed files with 62 additions and 0 deletions
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56
glsl_types.cpp
View file

@ -159,3 +159,59 @@ const glsl_type *glsl_type::get_base_type() const
return glsl_error_type;
}
}
const glsl_type *
glsl_type::get_instance(unsigned base_type, unsigned rows, unsigned columns)
{
if ((rows < 1) || (rows > 4) || (columns < 1) || (columns > 4))
return glsl_error_type;
/* Treat GLSL vectors as Nx1 matrices.
*/
if (columns == 1) {
switch (base_type) {
case GLSL_TYPE_UINT:
return glsl_uint_type + (rows - 1);
case GLSL_TYPE_INT:
return glsl_int_type + (rows - 1);
case GLSL_TYPE_FLOAT:
return glsl_float_type + (rows - 1);
case GLSL_TYPE_BOOL:
return glsl_bool_type + (rows - 1);
default:
return glsl_error_type;
}
} else {
if ((base_type != GLSL_TYPE_FLOAT) || (rows == 1))
return glsl_error_type;
/* GLSL matrix types are named mat{COLUMNS}x{ROWS}. Only the following
* combinations are valid:
*
* 1 2 3 4
* 1
* 2 x x x
* 3 x x x
* 4 x x x
*/
#define IDX(c,r) (((c-1)*3) + (r-1))
switch (IDX(columns, rows)) {
case IDX(2,2): return mat2_type;
case IDX(2,3): return mat2x3_type;
case IDX(2,4): return mat2x4_type;
case IDX(3,2): return mat3x2_type;
case IDX(3,3): return mat3_type;
case IDX(3,4): return mat3x4_type;
case IDX(4,2): return mat4x2_type;
case IDX(4,3): return mat4x3_type;
case IDX(4,4): return mat4_type;
default: return glsl_error_type;
}
}
assert(!"Should not get here.");
return glsl_error_type;
}

6
glsl_types.h
View file

@ -147,6 +147,12 @@ struct glsl_type {
*/
const glsl_type *get_base_type() const;
/**
* Get the instance of a built-in scalar, vector, or matrix type
*/
static const glsl_type *get_instance(unsigned base_type, unsigned rows,
unsigned columns);
/**
* Query whether or not a type is a scalar (non-vector and non-matrix).
*/