src/gallium/drivers/swr/rasterizer/core/frontend.h

   1 /****************************************************************************
   2 * Copyright (C) 2014-2015 Intel Corporation.   All Rights Reserved.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice (including the next
  12 * paragraph) shall be included in all copies or substantial portions of the
  13 * Software.
  14 *
  15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21 * IN THE SOFTWARE.
  22 *
  23 * @file frontend.h
  24 *
  25 * @brief Definitions for Frontend which handles vertex processing,
  26 *        primitive assembly, clipping, binning, etc.
  27 *
  28 ******************************************************************************/
  29 #pragma once
  30 #include "context.h"
  31 #include <type_traits>
  32
  33 // Calculates the A and B coefficients for the 3 edges of the triangle
  34 //
  35 // maths for edge equations:
  36 //   standard form of a line in 2d
  37 //   Ax + By + C = 0
  38 //   A = y0 - y1
  39 //   B = x1 - x0
  40 //   C = x0y1 - x1y0
  41 INLINE
  42 void triangleSetupAB(const __m128 vX, const __m128 vY, __m128 & vA, __m128 & vB)
  43 {
  44     // vYsub = y1 y2 y0 dc
  45     __m128 vYsub = _mm_shuffle_ps(vY, vY, _MM_SHUFFLE(3, 0, 2, 1));
  46     // vY =    y0 y1 y2 dc
  47     vA = _mm_sub_ps(vY, vYsub);
  48
  49     // Result:
  50     // A[0] = y0 - y1
  51     // A[1] = y1 - y2
  52     // A[2] = y2 - y0
  53
  54     // vXsub = x1 x2 x0 dc
  55     __m128 vXsub = _mm_shuffle_ps(vX, vX, _MM_SHUFFLE(3, 0, 2, 1));
  56     // vX =    x0 x1 x2 dc
  57     vB = _mm_sub_ps(vXsub, vX);
  58
  59     // Result:
  60     // B[0] = x1 - x0
  61     // B[1] = x2 - x1
  62     // B[2] = x0 - x2
  63 }
  64
  65 INLINE
  66 void triangleSetupABVertical(const simdscalar vX[3], const simdscalar vY[3], simdscalar (&vA)[3], simdscalar (&vB)[3])
  67 {
  68     // generate edge equations
  69     // A = y0 - y1
  70     // B = x1 - x0
  71     vA[0] = _simd_sub_ps(vY[0], vY[1]);
  72     vA[1] = _simd_sub_ps(vY[1], vY[2]);
  73     vA[2] = _simd_sub_ps(vY[2], vY[0]);
  74
  75     vB[0] = _simd_sub_ps(vX[1], vX[0]);
  76     vB[1] = _simd_sub_ps(vX[2], vX[1]);
  77     vB[2] = _simd_sub_ps(vX[0], vX[2]);
  78 }
  79
  80 INLINE
  81 void triangleSetupABInt(const __m128i vX, const __m128i vY, __m128i & vA, __m128i & vB)
  82 {
  83     // generate edge equations
  84     // A = y0 - y1
  85     // B = x1 - x0
  86     // C = x0y1 - x1y0
  87     __m128i vYsub = _mm_shuffle_epi32(vY, _MM_SHUFFLE(3, 0, 2, 1));
  88     vA = _mm_sub_epi32(vY, vYsub);
  89
  90     __m128i vXsub = _mm_shuffle_epi32(vX, _MM_SHUFFLE(3, 0, 2, 1));
  91     vB = _mm_sub_epi32(vXsub, vX);
  92 }
  93
  94 INLINE
  95 void triangleSetupABIntVertical(const simdscalari vX[3], const simdscalari vY[3], simdscalari (&vA)[3], simdscalari (&vB)[3])
  96 {
  97     // A = y0 - y1
  98     // B = x1 - x0
  99     vA[0] = _simd_sub_epi32(vY[0], vY[1]);
 100     vA[1] = _simd_sub_epi32(vY[1], vY[2]);
 101     vA[2] = _simd_sub_epi32(vY[2], vY[0]);
 102
 103     vB[0] = _simd_sub_epi32(vX[1], vX[0]);
 104     vB[1] = _simd_sub_epi32(vX[2], vX[1]);
 105     vB[2] = _simd_sub_epi32(vX[0], vX[2]);
 106 }
 107 // Calculate the determinant of the triangle
 108 // 2 vectors between the 3 points: P, Q
 109 // Px = x0-x2, Py = y0-y2
 110 // Qx = x1-x2, Qy = y1-y2
 111 //       |Px Qx|
 112 // det = |     | = PxQy - PyQx
 113 //       |Py Qy|
 114 // simplifies to : (x0-x2)*(y1-y2) - (y0-y2)*(x1-x2)
 115 //               try to reuse our A & B coef's already calculated. factor out a -1 from Py and Qx
 116 //               : B[2]*A[1] - (-(y2-y0))*(-(x2-x1))
 117 //               : B[2]*A[1] - (-1)(-1)(y2-y0)*(x2-x1)
 118 //               : B[2]*A[1] - A[2]*B[1]
 119 INLINE
 120 float calcDeterminantInt(const __m128i vA, const __m128i vB)
 121 {
 122     // vAShuf = [A1, A0, A2, A0]
 123     __m128i vAShuf = _mm_shuffle_epi32(vA, _MM_SHUFFLE(0, 2, 0, 1));
 124     // vBShuf = [B2, B0, B1, B0]
 125     __m128i vBShuf = _mm_shuffle_epi32(vB, _MM_SHUFFLE(0, 1, 0, 2));
 126     // vMul = [A1*B2, B1*A2]
 127     __m128i vMul   = _mm_mul_epi32(vAShuf, vBShuf);
 128
 129     // shuffle upper to lower
 130     // vMul2 = [B1*A2, B1*A2]
 131     __m128i vMul2 = _mm_shuffle_epi32(vMul, _MM_SHUFFLE(3, 2, 3, 2));
 132     //vMul = [A1*B2 - B1*A2]
 133     vMul = _mm_sub_epi64(vMul, vMul2);
 134
 135     int64_t result;
 136     _mm_store_sd((double*)&result, _mm_castsi128_pd(vMul));
 137
 138     double dResult = (double)result;
 139     dResult = dResult * (1.0 / FIXED_POINT16_SCALE);
 140
 141     return (float)dResult;
 142 }
 143
 144 INLINE
 145 void calcDeterminantIntVertical(const simdscalari vA[3], const simdscalari vB[3], simdscalari *pvDet)
 146 {
 147     // refer to calcDeterminantInt comment for calculation explanation
 148     // A1*B2
 149     simdscalari vA1Lo = _simd_unpacklo_epi32(vA[1], vA[1]);     // 0 0 1 1 4 4 5 5
 150     simdscalari vA1Hi = _simd_unpackhi_epi32(vA[1], vA[1]);     // 2 2 3 3 6 6 7 7
 151
 152     simdscalari vB2Lo = _simd_unpacklo_epi32(vB[2], vB[2]);
 153     simdscalari vB2Hi = _simd_unpackhi_epi32(vB[2], vB[2]);
 154
 155     simdscalari vA1B2Lo = _simd_mul_epi32(vA1Lo, vB2Lo);        // 0 1 4 5
 156     simdscalari vA1B2Hi = _simd_mul_epi32(vA1Hi, vB2Hi);        // 2 3 6 7
 157
 158     // B1*A2
 159     simdscalari vA2Lo = _simd_unpacklo_epi32(vA[2], vA[2]);
 160     simdscalari vA2Hi = _simd_unpackhi_epi32(vA[2], vA[2]);
 161
 162     simdscalari vB1Lo = _simd_unpacklo_epi32(vB[1], vB[1]);
 163     simdscalari vB1Hi = _simd_unpackhi_epi32(vB[1], vB[1]);
 164
 165     simdscalari vA2B1Lo = _simd_mul_epi32(vA2Lo, vB1Lo);
 166     simdscalari vA2B1Hi = _simd_mul_epi32(vA2Hi, vB1Hi);
 167
 168     // A1*B2 - A2*B1
 169     simdscalari detLo = _simd_sub_epi64(vA1B2Lo, vA2B1Lo);
 170     simdscalari detHi = _simd_sub_epi64(vA1B2Hi, vA2B1Hi);
 171
 172     // shuffle 0 1 4 5 -> 0 1 2 3
 173     simdscalari vResultLo = _mm256_permute2f128_si256(detLo, detHi, 0x20);
 174     simdscalari vResultHi = _mm256_permute2f128_si256(detLo, detHi, 0x31);
 175
 176     pvDet[0] = vResultLo;
 177     pvDet[1] = vResultHi;
 178 }
 179
 180 INLINE
 181 void triangleSetupC(const __m128 vX, const __m128 vY, const __m128 vA, const __m128 &vB, __m128 &vC)
 182 {
 183     // C = -Ax - By
 184     vC  = _mm_mul_ps(vA, vX);
 185     __m128 vCy = _mm_mul_ps(vB, vY);
 186     vC  = _mm_mul_ps(vC, _mm_set1_ps(-1.0f));
 187     vC  = _mm_sub_ps(vC, vCy);
 188 }
 189
 190 INLINE
 191 void viewportTransform(__m128 &vX, __m128 &vY, __m128 &vZ, const SWR_VIEWPORT_MATRIX &vpMatrix)
 192 {
 193     vX = _mm_mul_ps(vX, _mm_set1_ps(vpMatrix.m00));
 194     vX = _mm_add_ps(vX, _mm_set1_ps(vpMatrix.m30));
 195
 196     vY = _mm_mul_ps(vY, _mm_set1_ps(vpMatrix.m11));
 197     vY = _mm_add_ps(vY, _mm_set1_ps(vpMatrix.m31));
 198
 199     vZ = _mm_mul_ps(vZ, _mm_set1_ps(vpMatrix.m22));
 200     vZ = _mm_add_ps(vZ, _mm_set1_ps(vpMatrix.m32));
 201 }
 202
 203 template<uint32_t NumVerts>
 204 INLINE
 205 void viewportTransform(simdvector *v, const SWR_VIEWPORT_MATRICES & vpMatrices)
 206 {
 207     simdscalar m00 = _simd_load1_ps(&vpMatrices.m00[0]);
 208     simdscalar m30 = _simd_load1_ps(&vpMatrices.m30[0]);
 209     simdscalar m11 = _simd_load1_ps(&vpMatrices.m11[0]);
 210     simdscalar m31 = _simd_load1_ps(&vpMatrices.m31[0]);
 211     simdscalar m22 = _simd_load1_ps(&vpMatrices.m22[0]);
 212     simdscalar m32 = _simd_load1_ps(&vpMatrices.m32[0]);
 213
 214     for (uint32_t i = 0; i < NumVerts; ++i)
 215     {
 216         v[i].x = _simd_fmadd_ps(v[i].x, m00, m30);
 217         v[i].y = _simd_fmadd_ps(v[i].y, m11, m31);
 218         v[i].z = _simd_fmadd_ps(v[i].z, m22, m32);
 219     }
 220 }
 221
 222 template<uint32_t NumVerts>
 223 INLINE
 224 void viewportTransform(simdvector *v, const SWR_VIEWPORT_MATRICES & vpMatrices, simdscalari vViewportIdx)
 225 {
 226     // perform a gather of each matrix element based on the viewport array indexes
 227     simdscalar m00 = _simd_i32gather_ps(&vpMatrices.m00[0], vViewportIdx, 4);
 228     simdscalar m30 = _simd_i32gather_ps(&vpMatrices.m30[0], vViewportIdx, 4);
 229     simdscalar m11 = _simd_i32gather_ps(&vpMatrices.m11[0], vViewportIdx, 4);
 230     simdscalar m31 = _simd_i32gather_ps(&vpMatrices.m31[0], vViewportIdx, 4);
 231     simdscalar m22 = _simd_i32gather_ps(&vpMatrices.m22[0], vViewportIdx, 4);
 232     simdscalar m32 = _simd_i32gather_ps(&vpMatrices.m32[0], vViewportIdx, 4);
 233
 234     for (uint32_t i = 0; i < NumVerts; ++i)
 235     {
 236         v[i].x = _simd_fmadd_ps(v[i].x, m00, m30);
 237         v[i].y = _simd_fmadd_ps(v[i].y, m11, m31);
 238         v[i].z = _simd_fmadd_ps(v[i].z, m22, m32);
 239     }
 240 }
 241
 242 INLINE
 243 void calcBoundingBoxInt(const __m128i &vX, const __m128i &vY, SWR_RECT &bbox)
 244 {
 245     // Need horizontal fp min here
 246     __m128i vX1 = _mm_shuffle_epi32(vX, _MM_SHUFFLE(3, 2, 0, 1));
 247     __m128i vX2 = _mm_shuffle_epi32(vX, _MM_SHUFFLE(3, 0, 1, 2));
 248
 249     __m128i vY1 = _mm_shuffle_epi32(vY, _MM_SHUFFLE(3, 2, 0, 1));
 250     __m128i vY2 = _mm_shuffle_epi32(vY, _MM_SHUFFLE(3, 0, 1, 2));
 251
 252
 253     __m128i vMinX = _mm_min_epi32(vX, vX1);
 254             vMinX = _mm_min_epi32(vMinX, vX2);
 255
 256     __m128i vMaxX = _mm_max_epi32(vX, vX1);
 257             vMaxX = _mm_max_epi32(vMaxX, vX2);
 258
 259     __m128i vMinY = _mm_min_epi32(vY, vY1);
 260             vMinY = _mm_min_epi32(vMinY, vY2);
 261
 262     __m128i vMaxY = _mm_max_epi32(vY, vY1);
 263             vMaxY = _mm_max_epi32(vMaxY, vY2);
 264
 265     bbox.xmin = _mm_extract_epi32(vMinX, 0);
 266     bbox.xmax = _mm_extract_epi32(vMaxX, 0);
 267     bbox.ymin = _mm_extract_epi32(vMinY, 0);
 268     bbox.ymax = _mm_extract_epi32(vMaxY, 0);
 269 }
 270
 271 INLINE
 272 bool CanUseSimplePoints(DRAW_CONTEXT *pDC)
 273 {
 274     const API_STATE& state = GetApiState(pDC);
 275
 276     return (state.rastState.sampleCount == SWR_MULTISAMPLE_1X &&
 277             state.rastState.pointSize == 1.0f &&
 278             !state.rastState.pointParam &&
 279             !state.rastState.pointSpriteEnable);
 280 }
 281
 282 INLINE
 283 bool vHasNaN(const __m128& vec)
 284 {
 285     const __m128 result = _mm_cmpunord_ps(vec, vec);
 286     const int32_t mask = _mm_movemask_ps(result);
 287     return (mask != 0);
 288 }
 289
 290 uint32_t GetNumPrims(PRIMITIVE_TOPOLOGY mode, uint32_t numElements);
 291 uint32_t NumVertsPerPrim(PRIMITIVE_TOPOLOGY topology, bool includeAdjVerts);
 292
 293
 294 // ProcessDraw front-end function.  All combinations of parameter values are available
 295 PFN_FE_WORK_FUNC GetProcessDrawFunc(
 296     bool IsIndexed,
 297     bool IsCutIndexEnabled,
 298     bool HasTessellation,
 299     bool HasGeometryShader,
 300     bool HasStreamOut,
 301     bool HasRasterization);
 302
 303 void ProcessClear(SWR_CONTEXT *pContext, DRAW_CONTEXT *pDC, uint32_t workerId, void *pUserData);
 304 void ProcessStoreTiles(SWR_CONTEXT *pContext, DRAW_CONTEXT *pDC, uint32_t workerId, void *pUserData);
 305 void ProcessDiscardInvalidateTiles(SWR_CONTEXT *pContext, DRAW_CONTEXT *pDC, uint32_t workerId, void *pUserData);
 306 void ProcessSync(SWR_CONTEXT *pContext, DRAW_CONTEXT *pDC, uint32_t workerId, void *pUserData);
 307
 308 PFN_PROCESS_PRIMS GetBinTrianglesFunc(bool IsConservative);
 309
 310 struct PA_STATE_BASE;  // forward decl
 311 void BinPoints(DRAW_CONTEXT *pDC, PA_STATE& pa, uint32_t workerId, simdvector prims[3], uint32_t primMask, simdscalari primID, simdscalari viewportIdx);
 312 void BinLines(DRAW_CONTEXT *pDC, PA_STATE& pa, uint32_t workerId, simdvector prims[3], uint32_t primMask, simdscalari primID, simdscalari viewportIdx);
 313