src/mesa/drivers/dri/i965/brw_vs_constval.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a copy of this software and associated documentation files (the
   8  "Software"), to deal in the Software without restriction, including
   9  without limitation the rights to use, copy, modify, merge, publish,
  10  distribute, sublicense, and/or sell copies of the Software, and to
  11  permit persons to whom the Software is furnished to do so, subject to
  12  the following conditions:
  13
  14  The above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #include "main/macros.h"
  34 #include "brw_context.h"
  35 #include "brw_vs.h"
  36
  37 /* Component is active if it may diverge from [0,0,0,1].  Undef values
  38  * are promoted to [0,0,0,1] for the purposes of this analysis.
  39  */
  40 struct tracker {
  41    bool twoside;
  42    GLubyte active[PROGRAM_OUTPUT+1][MAX_PROGRAM_TEMPS];
  43    GLbitfield64 size_masks[4];  /**< one bit per fragment program input attrib */
  44 };
  45
  46
  47 static void set_active_component( struct tracker *t,
  48                                   GLuint file,
  49                                   GLuint index,
  50                                   GLubyte active )
  51 {
  52    switch (file) {
  53    case PROGRAM_TEMPORARY:
  54    case PROGRAM_INPUT:
  55    case PROGRAM_OUTPUT:
  56       assert(file < PROGRAM_OUTPUT + 1);
  57       assert(index < Elements(t->active[0]));
  58       t->active[file][index] |= active;
  59       break;
  60    default:
  61       break;
  62    }
  63 }
  64
  65 static void set_active( struct tracker *t,
  66                         struct prog_dst_register dst,
  67                         GLuint active )
  68 {
  69    set_active_component( t, dst.File, dst.Index, active & dst.WriteMask );
  70 }
  71
  72
  73 static GLubyte get_active_component( struct tracker *t,
  74                                      GLuint file,
  75                                      GLuint index,
  76                                      GLuint component,
  77                                      GLubyte swz )
  78 {
  79    switch (swz) {
  80    case SWIZZLE_ZERO:
  81       return component < 3 ? 0 : (1<<component);
  82    case SWIZZLE_ONE:
  83       return component == 3 ? 0 : (1<<component);
  84    default:
  85       switch (file) {
  86       case PROGRAM_TEMPORARY:
  87       case PROGRAM_INPUT:
  88       case PROGRAM_OUTPUT:
  89          return t->active[file][index] & (1<<component);
  90       default:
  91          return 1 << component;
  92       }
  93    }
  94 }
  95
  96
  97 static GLubyte get_active( struct tracker *t,
  98                            struct prog_src_register src )
  99 {
 100    GLuint i;
 101    GLubyte active = src.Negate; /* NOTE! */
 102
 103    if (src.RelAddr)
 104       return 0xf;
 105
 106    for (i = 0; i < 4; i++)
 107       active |= get_active_component(t, src.File, src.Index, i,
 108                                      GET_SWZ(src.Swizzle, i));
 109
 110    return active;
 111 }
 112
 113 /**
 114  * Return the size (1,2,3 or 4) of the output/result for VARYING_SLOT_idx.
 115  */
 116 static GLubyte get_output_size( struct tracker *t,
 117                                 GLuint idx )
 118 {
 119    GLubyte active;
 120    assert(idx < VARYING_SLOT_MAX);
 121    active = t->active[PROGRAM_OUTPUT][idx];
 122    if (active & (1<<3)) return 4;
 123    if (active & (1<<2)) return 3;
 124    if (active & (1<<1)) return 2;
 125    if (active & (1<<0)) return 1;
 126    return 0;
 127 }
 128
 129 /* Note the potential copying that occurs in the setup program:
 130  */
 131 static void calc_sizes( struct tracker *t )
 132 {
 133    GLint vertRes;
 134
 135    if (t->twoside) {
 136       t->active[PROGRAM_OUTPUT][VARYING_SLOT_COL0] |=
 137          t->active[PROGRAM_OUTPUT][VARYING_SLOT_BFC0];
 138
 139       t->active[PROGRAM_OUTPUT][VARYING_SLOT_COL1] |=
 140          t->active[PROGRAM_OUTPUT][VARYING_SLOT_BFC1];
 141    }
 142
 143    /* Examine vertex program output sizes to set the size_masks[] info
 144     * which describes the fragment program input sizes.
 145     */
 146    for (vertRes = 0; vertRes < VARYING_SLOT_MAX; vertRes++) {
 147
 148       /* map vertex program output index to fragment program input index */
 149       GLint fragAttrib = _mesa_vert_result_to_frag_attrib(vertRes);
 150       if (fragAttrib < 0)
 151          continue;
 152
 153       switch (get_output_size(t, vertRes)) {
 154       case 4: t->size_masks[4-1] |= BITFIELD64_BIT(fragAttrib);
 155       case 3: t->size_masks[3-1] |= BITFIELD64_BIT(fragAttrib);
 156       case 2: t->size_masks[2-1] |= BITFIELD64_BIT(fragAttrib);
 157       case 1: t->size_masks[1-1] |= BITFIELD64_BIT(fragAttrib);
 158          break;
 159       }
 160    }
 161 }
 162
 163 static GLubyte szflag[4+1] = {
 164    0,
 165    0x1,
 166    0x3,
 167    0x7,
 168    0xf
 169 };
 170
 171 /* Pull a size out of the packed array:
 172  */
 173 static GLuint get_input_size(struct brw_context *brw,
 174                              GLuint attr)
 175 {
 176    GLuint sizes_dword = brw->vb.info.sizes[attr/16];
 177    GLuint sizes_bits = (sizes_dword>>((attr%16)*2)) & 0x3;
 178    return sizes_bits + 1;
 179 /*    return brw->vb.inputs[attr].glarray->Size; */
 180 }
 181
 182 /* Calculate sizes of vertex program outputs.  Size is the largest
 183  * component index which might vary from [0,0,0,1]
 184  */
 185 static void calc_wm_input_sizes( struct brw_context *brw )
 186 {
 187    struct gl_context *ctx = &brw->intel.ctx;
 188    /* BRW_NEW_VERTEX_PROGRAM */
 189    const struct brw_vertex_program *vp =
 190       brw_vertex_program_const(brw->vertex_program);
 191    /* BRW_NEW_INPUT_DIMENSIONS */
 192    struct tracker t;
 193    GLuint insn;
 194    GLuint i;
 195
 196    /* Mesa IR is not generated for GLSL vertex shaders.  If there's no Mesa
 197     * IR, the code below cannot determine which output components are
 198     * written.  So, skip it and assume everything is written.  This
 199     * circumvents some optimizations in the fragment shader, but it guarantees
 200     * that correct code is generated.
 201     */
 202    if (vp->program.Base.NumInstructions == 0) {
 203       brw->wm.input_size_masks[0] = ~(GLbitfield64) 0;
 204       brw->wm.input_size_masks[1] = ~(GLbitfield64) 0;
 205       brw->wm.input_size_masks[2] = ~(GLbitfield64) 0;
 206       brw->wm.input_size_masks[3] = ~(GLbitfield64) 0;
 207       return;
 208    }
 209
 210
 211    memset(&t, 0, sizeof(t));
 212
 213    /* _NEW_LIGHT | _NEW_PROGRAM */
 214    if (ctx->VertexProgram._TwoSideEnabled)
 215       t.twoside = 1;
 216
 217    for (i = 0; i < VERT_ATTRIB_MAX; i++)
 218       if (vp->program.Base.InputsRead & BITFIELD64_BIT(i))
 219          set_active_component(&t, PROGRAM_INPUT, i,
 220                               szflag[get_input_size(brw, i)]);
 221
 222    for (insn = 0; insn < vp->program.Base.NumInstructions; insn++) {
 223       struct prog_instruction *inst = &vp->program.Base.Instructions[insn];
 224
 225       switch (inst->Opcode) {
 226       case OPCODE_ARL:
 227          break;
 228
 229       case OPCODE_MOV:
 230          set_active(&t, inst->DstReg, get_active(&t, inst->SrcReg[0]));
 231          break;
 232
 233       default:
 234          set_active(&t, inst->DstReg, 0xf);
 235          break;
 236       }
 237    }
 238
 239    calc_sizes(&t);
 240
 241    /* _NEW_POINT
 242     *
 243     * If the SF will be replacing the vertex output with a reference to
 244     * gl_PointCoord, then tell the fragment shader that the value actually
 245     * does vary.
 246     */
 247    if (ctx->Point.PointSprite) {
 248       for (int i = 0; i < 8; i++) {
 249          if (ctx->Point.CoordReplace[i]) {
 250             t.size_masks[4-1] |= FRAG_BIT_TEX(i);
 251             t.size_masks[3-1] |= FRAG_BIT_TEX(i);
 252             t.size_masks[2-1] |= FRAG_BIT_TEX(i);
 253             t.size_masks[1-1] |= FRAG_BIT_TEX(i);
 254          }
 255       }
 256    }
 257
 258    if (memcmp(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks)) != 0) {
 259       memcpy(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks));
 260       brw->state.dirty.brw |= BRW_NEW_WM_INPUT_DIMENSIONS;
 261    }
 262 }
 263
 264 const struct brw_tracked_state brw_wm_input_sizes = {
 265    .dirty = {
 266       .mesa  = _NEW_LIGHT | _NEW_PROGRAM | _NEW_POINT,
 267       .brw   = BRW_NEW_VERTEX_PROGRAM | BRW_NEW_INPUT_DIMENSIONS,
 268       .cache = 0
 269    },
 270    .emit = calc_wm_input_sizes
 271 };
 272