diff options
| author | Kenneth Graunke <[email protected]> | 2012-12-01 23:49:26 -0800 |
|---|---|---|
| committer | Matt Turner <[email protected]> | 2013-02-28 13:18:59 -0800 |
| commit | 93066ce1299a7be8f670e527f249940c635605b4 (patch) | |
| tree | 1e7c958b7feb9a605a6c9f482bc68798990c89f4 /src/mesa/drivers | |
| parent | 18281d60889c7bb0ef14d2aa8a080cdaead7adb3 (diff) | |
glsl: Convert mix() to use a new ir_triop_lrp opcode.
Many GPUs have an instruction to do linear interpolation which is more
efficient than simply performing the algebra necessary (two multiplies,
an add, and a subtract).
Pattern matching or peepholing this is more desirable, but can be
tricky. By using an opcode, we can at least make shaders which use the
mix() built-in get the more efficient behavior.
Currently, all consumers lower ir_triop_lrp. Subsequent patches will
actually generate different code.
v2 [mattst88]:
- Add LRP_TO_ARITH flag to ir_to_mesa.cpp. Will be removed in a
subsequent patch and ir_triop_lrp translated directly.
v3 [mattst88]:
- Move changes from the next patch to opt_algebraic.cpp to accept
3-src operations.
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Signed-off-by: Kenneth Graunke <[email protected]>
Diffstat (limited to 'src/mesa/drivers')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_shader.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp index c71715ee512..9ab18cc7d63 100644 --- a/src/mesa/drivers/dri/i965/brw_shader.cpp +++ b/src/mesa/drivers/dri/i965/brw_shader.cpp @@ -155,7 +155,8 @@ brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg) DIV_TO_MUL_RCP | SUB_TO_ADD_NEG | EXP_TO_EXP2 | - LOG_TO_LOG2); + LOG_TO_LOG2 | + LRP_TO_ARITH); /* Pre-gen6 HW can only nest if-statements 16 deep. Beyond this, * if-statements need to be flattened. |