diff options
| author | Stéphane Marchesin <[email protected]> | 2011-06-28 00:53:01 -0700 |
|---|---|---|
| committer | Stéphane Marchesin <[email protected]> | 2011-06-28 00:59:41 -0700 |
| commit | 062a1e291fdc0ef69b6677f8ae0e3471047e281d (patch) | |
| tree | fb5aabb9ebc44db0df1f8290677c4c4dd302c1de /src | |
| parent | 77896b256a5e311ad68a588471dba63f405899a5 (diff) | |
i915g: Improve SIN/COS a bit.
Diffstat (limited to 'src')
| -rw-r--r-- | src/gallium/drivers/i915/i915_fpc_translate.c | 40 |
1 files changed, 20 insertions, 20 deletions
diff --git a/src/gallium/drivers/i915/i915_fpc_translate.c b/src/gallium/drivers/i915/i915_fpc_translate.c index 5018456f14f..b1e0f6a3f03 100644 --- a/src/gallium/drivers/i915/i915_fpc_translate.c +++ b/src/gallium/drivers/i915/i915_fpc_translate.c @@ -72,19 +72,33 @@ static unsigned passthrough[] = /* 1, -1/3!, 1/5!, -1/7! */ -static const float sin_constants[4] = { 1.0, +static const float scs_sin_constants[4] = { 1.0, -1.0f / (3 * 2 * 1), 1.0f / (5 * 4 * 3 * 2 * 1), -1.0f / (7 * 6 * 5 * 4 * 3 * 2 * 1) }; /* 1, -1/2!, 1/4!, -1/6! */ -static const float cos_constants[4] = { 1.0, +static const float scs_cos_constants[4] = { 1.0, -1.0f / (2 * 1), 1.0f / (4 * 3 * 2 * 1), -1.0f / (6 * 5 * 4 * 3 * 2 * 1) }; +/* 1, -1/3!, 1/5!, -1/7! */ +static const float sin_constants[4] = { 2.0 * M_PI, + -8.0f * M_PI * M_PI * M_PI / (3 * 2 * 1), + 32.0f * M_PI * M_PI * M_PI * M_PI * M_PI / (5 * 4 * 3 * 2 * 1), + -128.0f * M_PI * M_PI * M_PI * M_PI * M_PI * M_PI * M_PI / (7 * 6 * 5 * 4 * 3 * 2 * 1) +}; + +/* 1, -1/2!, 1/4!, -1/6! */ +static const float cos_constants[4] = { 1.0, + -4.0f * M_PI * M_PI / (2 * 1), + 16.0f * M_PI * M_PI * M_PI * M_PI / (4 * 3 * 2 * 1), + -64.0f * M_PI * M_PI * M_PI * M_PI * M_PI * M_PI / (6 * 5 * 4 * 3 * 2 * 1) +}; + /** @@ -483,13 +497,6 @@ i915_translate_instruction(struct i915_fp_compile *p, i915_emit_arith(p, A0_MOD, tmp, A0_DEST_CHANNEL_X, 0, tmp, 0, 0); - /* By choosing different taylor constants, could get rid of this mul: - */ - i915_emit_arith(p, - A0_MUL, - tmp, A0_DEST_CHANNEL_X, 0, - tmp, i915_emit_const1f(p, (float) (M_PI * 2.0)), 0); - /* * t0.xy = MUL x.xx11, x.x1111 ; x^2, x, 1, 1 * t0 = MUL t0.xyxy t0.xx11 ; x^4, x^3, x^2, 1 @@ -772,9 +779,9 @@ i915_translate_instruction(struct i915_fp_compile *p, * t0.xy = MUL x.xx11, x.x1111 ; x^2, x, 1, 1 * t0 = MUL t0.xyxy t0.xx11 ; x^4, x^3, x^2, x * t1 = MUL t0.xyyw t0.yz11 ; x^7 x^5 x^3 x - * scs.x = DP4 t1, sin_constants + * scs.x = DP4 t1, scs_sin_constants * t1 = MUL t0.xxz1 t0.z111 ; x^6 x^4 x^2 1 - * scs.y = DP4 t1, cos_constants + * scs.y = DP4 t1, scs_cos_constants */ i915_emit_arith(p, A0_MUL, @@ -809,7 +816,7 @@ i915_translate_instruction(struct i915_fp_compile *p, get_result_vector(p, &inst->Dst[0]), A0_DEST_CHANNEL_Y, 0, swizzle(tmp1, W, Z, Y, X), - i915_emit_const4fv(p, sin_constants), 0); + i915_emit_const4fv(p, scs_sin_constants), 0); } if (writemask & TGSI_WRITEMASK_X) { @@ -824,7 +831,7 @@ i915_translate_instruction(struct i915_fp_compile *p, get_result_vector(p, &inst->Dst[0]), A0_DEST_CHANNEL_X, 0, swizzle(tmp, ONE, Z, Y, X), - i915_emit_const4fv(p, cos_constants), 0); + i915_emit_const4fv(p, scs_cos_constants), 0); } break; @@ -871,13 +878,6 @@ i915_translate_instruction(struct i915_fp_compile *p, i915_emit_arith(p, A0_MOD, tmp, A0_DEST_CHANNEL_X, 0, tmp, 0, 0); - /* By choosing different taylor constants, could get rid of this mul: - */ - i915_emit_arith(p, - A0_MUL, - tmp, A0_DEST_CHANNEL_X, 0, - tmp, i915_emit_const1f(p, (float) (M_PI * 2.0)), 0); - /* * t0.xy = MUL x.xx11, x.x1111 ; x^2, x, 1, 1 * t0 = MUL t0.xyxy t0.xx11 ; x^4, x^3, x^2, x |