diff options
Diffstat (limited to 'src/mesa/shader/program_instruction.h')
| -rw-r--r-- | src/mesa/shader/program_instruction.h | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/src/mesa/shader/program_instruction.h b/src/mesa/shader/program_instruction.h index 20886d9f021..93bcfc240a9 100644 --- a/src/mesa/shader/program_instruction.h +++ b/src/mesa/shader/program_instruction.h @@ -75,6 +75,19 @@ /** + * Per-component negation masks + */ +/*@{*/ +#define NEGATE_X 0x1 +#define NEGATE_Y 0x2 +#define NEGATE_Z 0x4 +#define NEGATE_W 0x8 +#define NEGATE_XYZW 0xf +#define NEGATE_NONE 0x0 +/*@}*/ + + +/** * Program instruction opcodes, for both vertex and fragment programs. * \note changes to this opcode list must be reflected in t_vb_arbprogram.c */ @@ -173,7 +186,8 @@ struct prog_src_register */ /*@{*/ /** - * Per-component negation for the SWZ instruction. + * Per-component negation for the SWZ instruction. For non-SWZ + * instructions the only possible values are NEGATE_XYZW and NEGATE_NONE. * * \since * ARB_vertex_program, ARB_fragment_program @@ -190,8 +204,7 @@ struct prog_src_register GLuint Abs:1; /** - * Take the component-wise negation. The negation occurs \b after the - * (optional) absolute value operation. + * Post-absolute value negation (all components). */ GLuint NegateAbs:1; /*@}*/ |