diff options
| author | Andrii Simiklit <[email protected]> | 2019-09-10 17:00:32 +0300 |
|---|---|---|
| committer | Eric Anholt <[email protected]> | 2019-09-27 21:42:09 +0000 |
| commit | b32bb888c70576bf7e48f22703028eb1a43da651 (patch) | |
| tree | 8d2232d112bdde987a8d3adc4011d998890b3f54 | |
| parent | 67e897729050aeec9b798621dfee6151bedf3864 (diff) | |
glsl: disallow incompatible matrices multiplication
glsl 4.4 spec section '5.9 expressions':
"The operator is multiply (*), where both operands are matrices or one operand is a vector and the
other a matrix. A right vector operand is treated as a column vector and a left vector operand as a
row vector. In all these cases, it is required that the number of columns of the left operand is equal
to the number of rows of the right operand. Then, the multiply (*) operation does a linear
algebraic multiply, yielding an object that has the same number of rows as the left operand and the
same number of columns as the right operand. Section 5.10 “Vector and Matrix Operations”
explains in more detail how vectors and matrices are operated on."
This fix disallows a multiplication of incompatible matrices like:
mat4x3(..) * mat4x3(..)
mat4x2(..) * mat4x2(..)
mat3x2(..) * mat3x2(..)
....
CC: <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111664
Signed-off-by: Andrii Simiklit <[email protected]>
| -rw-r--r-- | src/compiler/glsl_types.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/compiler/glsl_types.cpp b/src/compiler/glsl_types.cpp index 2213055021d..e412f16bcfa 100644 --- a/src/compiler/glsl_types.cpp +++ b/src/compiler/glsl_types.cpp @@ -1354,9 +1354,7 @@ glsl_type::get_function_instance(const glsl_type *return_type, const glsl_type * glsl_type::get_mul_type(const glsl_type *type_a, const glsl_type *type_b) { - if (type_a == type_b) { - return type_a; - } else if (type_a->is_matrix() && type_b->is_matrix()) { + if (type_a->is_matrix() && type_b->is_matrix()) { /* Matrix multiply. The columns of A must match the rows of B. Given * the other previously tested constraints, this means the vector type * of a row from A must be the same as the vector type of a column from @@ -1376,6 +1374,8 @@ glsl_type::get_mul_type(const glsl_type *type_a, const glsl_type *type_b) return type; } + } else if (type_a == type_b) { + return type_a; } else if (type_a->is_matrix()) { /* A is a matrix and B is a column vector. Columns of A must match * rows of B. Given the other previously tested constraints, this |