diff options
author | Keith Whitwell <keithw@vmware.com> | 2010-08-22 10:57:12 +0100 |
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committer | Keith Whitwell <keithw@vmware.com> | 2010-08-27 09:47:22 +0100 |
commit | 0be0ad5d58806bc12ec2c7bb3c00e7f8c7a6d6c4 (patch) | |
tree | 88c74b90c6d449e3fa77a213a8120f0597a60086 /src/gallium/drivers/llvmpipe/lp_setup_coef_intrin.c | |
parent | af8f037db2cea78e6c5a1ed5fb63fcb90cebdd9b (diff) |
llvmpipe: intrinsics version of triangle coeficient calculation
Looks nice, but makes almost no impact on performance - maybe
a percent or so in isosurf, nothing elsewhere. May be of use
later on.
Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_setup_coef_intrin.c')
-rw-r--r-- | src/gallium/drivers/llvmpipe/lp_setup_coef_intrin.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_setup_coef_intrin.c b/src/gallium/drivers/llvmpipe/lp_setup_coef_intrin.c new file mode 100644 index 0000000000..b477bc2113 --- /dev/null +++ b/src/gallium/drivers/llvmpipe/lp_setup_coef_intrin.c @@ -0,0 +1,208 @@ +/************************************************************************** + * + * Copyright 2010 VMware. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + +/* + * Binning code for triangles + */ + +#include "util/u_math.h" +#include "util/u_memory.h" +#include "lp_perf.h" +#include "lp_setup_context.h" +#include "lp_setup_coef.h" +#include "lp_rast.h" +#include "lp_state_fs.h" + +#if defined(PIPE_ARCH_SSE) +#include <emmintrin.h> + + +static void constant_coef4( struct lp_rast_shader_inputs *inputs, + const struct lp_tri_info *info, + unsigned slot, + const float *attr) +{ + *(__m128 *)inputs->a0[slot] = *(__m128 *)attr; + *(__m128 *)inputs->dadx[slot] = _mm_set1_ps(0.0); + *(__m128 *)inputs->dady[slot] = _mm_set1_ps(0.0); +} + + + +/** + * Setup the fragment input attribute with the front-facing value. + * \param frontface is the triangle front facing? + */ +static void setup_facing_coef( struct lp_rast_shader_inputs *inputs, + const struct lp_tri_info *info, + unsigned slot ) +{ + /* XXX: just pass frontface directly to the shader, don't bother + * treating it as an input. + */ + __m128 a0 = _mm_setr_ps(info->frontfacing ? 1.0 : -1.0, + 0, 0, 0); + + *(__m128 *)inputs->a0[slot] = a0; + *(__m128 *)inputs->dadx[slot] = _mm_set1_ps(0.0); + *(__m128 *)inputs->dady[slot] = _mm_set1_ps(0.0); +} + + + +static void calc_coef4( struct lp_rast_shader_inputs *inputs, + const struct lp_tri_info *info, + unsigned slot, + __m128 a0, + __m128 a1, + __m128 a2) +{ + __m128 da01 = _mm_sub_ps(a0, a1); + __m128 da20 = _mm_sub_ps(a2, a0); + + __m128 da01_dy20_ooa = _mm_mul_ps(da01, _mm_set1_ps(info->dy20_ooa)); + __m128 da20_dy01_ooa = _mm_mul_ps(da20, _mm_set1_ps(info->dy01_ooa)); + __m128 dadx = _mm_sub_ps(da01_dy20_ooa, da20_dy01_ooa); + + __m128 da01_dx20_ooa = _mm_mul_ps(da01, _mm_set1_ps(info->dx20_ooa)); + __m128 da20_dx01_ooa = _mm_mul_ps(da20, _mm_set1_ps(info->dx01_ooa)); + __m128 dady = _mm_sub_ps(da20_dx01_ooa, da01_dx20_ooa); + + __m128 dadx_x0 = _mm_mul_ps(dadx, _mm_set1_ps(info->x0_center)); + __m128 dady_y0 = _mm_mul_ps(dady, _mm_set1_ps(info->y0_center)); + __m128 attr_v0 = _mm_add_ps(dadx_x0, dady_y0); + __m128 attr_0 = _mm_sub_ps(a0, attr_v0); + + *(__m128 *)inputs->a0[slot] = attr_0; + *(__m128 *)inputs->dadx[slot] = dadx; + *(__m128 *)inputs->dady[slot] = dady; +} + + +static void linear_coef( struct lp_rast_shader_inputs *inputs, + const struct lp_tri_info *info, + unsigned slot, + unsigned vert_attr) +{ + __m128 a0 = *(const __m128 *)info->v0[vert_attr]; + __m128 a1 = *(const __m128 *)info->v1[vert_attr]; + __m128 a2 = *(const __m128 *)info->v2[vert_attr]; + + calc_coef4(inputs, info, slot, a0, a1, a2); +} + + + +/** + * Compute a0, dadx and dady for a perspective-corrected interpolant, + * for a triangle. + * We basically multiply the vertex value by 1/w before computing + * the plane coefficients (a0, dadx, dady). + * Later, when we compute the value at a particular fragment position we'll + * divide the interpolated value by the interpolated W at that fragment. + */ +static void perspective_coef( struct lp_rast_shader_inputs *inputs, + const struct lp_tri_info *info, + unsigned slot, + unsigned vert_attr) +{ + /* premultiply by 1/w (v[0][3] is always 1/w): + */ + __m128 a0 = *(const __m128 *)info->v0[vert_attr]; + __m128 a1 = *(const __m128 *)info->v1[vert_attr]; + __m128 a2 = *(const __m128 *)info->v2[vert_attr]; + + __m128 a0_oow = _mm_mul_ps(a0, _mm_set1_ps(info->v0[0][3])); + __m128 a1_oow = _mm_mul_ps(a1, _mm_set1_ps(info->v1[0][3])); + __m128 a2_oow = _mm_mul_ps(a2, _mm_set1_ps(info->v2[0][3])); + + calc_coef4(inputs, info, slot, a0_oow, a1_oow, a2_oow); +} + + + + + +/** + * Compute the inputs-> dadx, dady, a0 values. + */ +void lp_setup_tri_coef( struct lp_setup_context *setup, + struct lp_rast_shader_inputs *inputs, + const struct lp_tri_info *info) +{ + unsigned slot; + + /* The internal position input is in slot zero: + */ + linear_coef(inputs, info, 0, 0); + + /* setup interpolation for all the remaining attributes: + */ + for (slot = 0; slot < setup->fs.nr_inputs; slot++) { + unsigned vert_attr = setup->fs.input[slot].src_index; + + switch (setup->fs.input[slot].interp) { + case LP_INTERP_CONSTANT: + if (setup->flatshade_first) { + constant_coef4(inputs, info, slot+1, info->v0[vert_attr]); + } + else { + constant_coef4(inputs, info, slot+1, info->v2[vert_attr]); + } + break; + + case LP_INTERP_LINEAR: + linear_coef(inputs, info, slot+1, vert_attr); + break; + + case LP_INTERP_PERSPECTIVE: + perspective_coef(inputs, info, slot+1, vert_attr); + break; + + case LP_INTERP_POSITION: + /* + * The generated pixel interpolators will pick up the coeffs from + * slot 0. + */ + break; + + case LP_INTERP_FACING: + setup_facing_coef(inputs, info, slot+1); + break; + + default: + assert(0); + } + } +} + +#else +extern void lp_setup_coef_dummy(void); +void lp_setup_coef_dummy(void) +{ +} +#endif |