src/gallium/drivers/svga/svga_state_constants.c

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "util/u_inlines.h"
  27 #include "pipe/p_defines.h"
  28
  29 #include "svga_screen.h"
  30 #include "svga_context.h"
  31 #include "svga_state.h"
  32 #include "svga_cmd.h"
  33 #include "svga_tgsi.h"
  34 #include "svga_debug.h"
  35
  36 #include "svga_hw_reg.h"
  37
  38
  39 /*
  40  * Don't try to send more than 4kb of successive constants.
  41  */
  42 #define MAX_CONST_REG_COUNT 256  /**< number of float[4] constants */
  43
  44
  45
  46 /**
  47  * Convert from PIPE_SHADER_* to SVGA3D_SHADERTYPE_*
  48  */
  49 static int
  50 svga_shader_type(unsigned shader)
  51 {
  52    assert(PIPE_SHADER_VERTEX + 1 == SVGA3D_SHADERTYPE_VS);
  53    assert(PIPE_SHADER_FRAGMENT + 1 == SVGA3D_SHADERTYPE_PS);
  54    assert(shader <= PIPE_SHADER_FRAGMENT);
  55    return shader + 1;
  56 }
  57
  58
  59 /**
  60  * Check and emit one shader constant register.
  61  * \param shader  PIPE_SHADER_FRAGMENT or PIPE_SHADER_VERTEX
  62  * \param i  which float[4] constant to change
  63  * \param value  the new float[4] value
  64  */
  65 static enum pipe_error
  66 emit_const(struct svga_context *svga, unsigned shader, unsigned i,
  67            const float *value)
  68 {
  69    enum pipe_error ret = PIPE_OK;
  70
  71    assert(shader < PIPE_SHADER_TYPES);
  72    assert(i < SVGA3D_CONSTREG_MAX);
  73
  74    if (memcmp(svga->state.hw_draw.cb[shader][i], value,
  75               4 * sizeof(float)) != 0) {
  76       if (SVGA_DEBUG & DEBUG_CONSTS)
  77          debug_printf("%s %s %u: %f %f %f %f\n",
  78                       __FUNCTION__,
  79                       shader == PIPE_SHADER_VERTEX ? "VERT" : "FRAG",
  80                       i,
  81                       value[0],
  82                       value[1],
  83                       value[2],
  84                       value[3]);
  85
  86       ret = SVGA3D_SetShaderConst( svga->swc,
  87                                    i,
  88                                    svga_shader_type(shader),
  89                                    SVGA3D_CONST_TYPE_FLOAT,
  90                                    value );
  91       if (ret != PIPE_OK)
  92          return ret;
  93
  94       memcpy(svga->state.hw_draw.cb[shader][i], value, 4 * sizeof(float));
  95    }
  96
  97    return ret;
  98 }
  99
 100
 101 /*
 102  * Check and emit a range of shader constant registers, trying to coalesce
 103  * successive shader constant updates in a single command in order to save
 104  * space on the command buffer.  This is a HWv8 feature.
 105  */
 106 static enum pipe_error
 107 emit_const_range(struct svga_context *svga,
 108                  unsigned shader,
 109                  unsigned offset,
 110                  unsigned count,
 111                  const float (*values)[4])
 112 {
 113    unsigned i, j;
 114    enum pipe_error ret;
 115
 116 #ifdef DEBUG
 117    if (offset + count > SVGA3D_CONSTREG_MAX) {
 118       debug_printf("svga: too many constants (offset + count = %u)\n",
 119                    offset + count);
 120    }
 121 #endif
 122
 123    if (offset > SVGA3D_CONSTREG_MAX) {
 124       /* This isn't OK, but if we propagate an error all the way up we'll
 125        * just get into more trouble.
 126        * XXX note that offset is always zero at this time so this is moot.
 127        */
 128       return PIPE_OK;
 129    }
 130
 131    if (offset + count > SVGA3D_CONSTREG_MAX) {
 132       /* Just drop the extra constants for now.
 133        * Ideally we should not have allowed the app to create a shader
 134        * that exceeds our constant buffer size but there's no way to
 135        * express that in gallium at this time.
 136        */
 137       count = SVGA3D_CONSTREG_MAX - offset;
 138    }
 139
 140    i = 0;
 141    while (i < count) {
 142       if (memcmp(svga->state.hw_draw.cb[shader][offset + i],
 143                  values[i],
 144                  4 * sizeof(float)) != 0) {
 145          /* Found one dirty constant
 146           */
 147          if (SVGA_DEBUG & DEBUG_CONSTS)
 148             debug_printf("%s %s %d: %f %f %f %f\n",
 149                          __FUNCTION__,
 150                          shader == PIPE_SHADER_VERTEX ? "VERT" : "FRAG",
 151                          offset + i,
 152                          values[i][0],
 153                          values[i][1],
 154                          values[i][2],
 155                          values[i][3]);
 156
 157          /* Look for more consecutive dirty constants.
 158           */
 159          j = i + 1;
 160          while (j < count &&
 161                 j < i + MAX_CONST_REG_COUNT &&
 162                 memcmp(svga->state.hw_draw.cb[shader][offset + j],
 163                        values[j],
 164                        4 * sizeof(float)) != 0) {
 165
 166             if (SVGA_DEBUG & DEBUG_CONSTS)
 167                debug_printf("%s %s %d: %f %f %f %f\n",
 168                             __FUNCTION__,
 169                             shader == PIPE_SHADER_VERTEX ? "VERT" : "FRAG",
 170                             offset + j,
 171                             values[j][0],
 172                             values[j][1],
 173                             values[j][2],
 174                             values[j][3]);
 175
 176             ++j;
 177          }
 178
 179          assert(j >= i + 1);
 180
 181          /* Send them all together.
 182           */
 183          ret = SVGA3D_SetShaderConsts(svga->swc,
 184                                       offset + i, j - i,
 185                                       svga_shader_type(shader),
 186                                       SVGA3D_CONST_TYPE_FLOAT,
 187                                       values + i);
 188          if (ret != PIPE_OK) {
 189             return ret;
 190          }
 191
 192          /*
 193           * Local copy of the hardware state.
 194           */
 195          memcpy(svga->state.hw_draw.cb[shader][offset + i],
 196                 values[i],
 197                 (j - i) * 4 * sizeof(float));
 198
 199          i = j + 1;
 200       } else {
 201          ++i;
 202       }
 203    }
 204
 205    return PIPE_OK;
 206 }
 207
 208
 209 /**
 210  * Emit all the constants in a constant buffer for a shader stage.
 211  */
 212 static enum pipe_error
 213 emit_consts(struct svga_context *svga, unsigned shader)
 214 {
 215    struct svga_screen *ss = svga_screen(svga->pipe.screen);
 216    struct pipe_transfer *transfer = NULL;
 217    unsigned count;
 218    const float (*data)[4] = NULL;
 219    unsigned i;
 220    enum pipe_error ret = PIPE_OK;
 221    const unsigned offset = 0;
 222
 223    assert(shader < PIPE_SHADER_TYPES);
 224
 225    if (svga->curr.cb[shader] == NULL)
 226       goto done;
 227
 228    count = svga->curr.cb[shader]->width0 / (4 * sizeof(float));
 229
 230    data = (const float (*)[4])pipe_buffer_map(&svga->pipe,
 231                                               svga->curr.cb[shader],
 232                                               PIPE_TRANSFER_READ,
 233                                               &transfer);
 234    if (data == NULL) {
 235       ret = PIPE_ERROR_OUT_OF_MEMORY;
 236       goto done;
 237    }
 238
 239    if (ss->hw_version >= SVGA3D_HWVERSION_WS8_B1) {
 240       ret = emit_const_range( svga, shader, offset, count, data );
 241       if (ret != PIPE_OK) {
 242          goto done;
 243       }
 244    } else {
 245       for (i = 0; i < count; i++) {
 246          ret = emit_const( svga, shader, offset + i, data[i] );
 247          if (ret != PIPE_OK) {
 248             goto done;
 249          }
 250       }
 251    }
 252
 253 done:
 254    if (data)
 255       pipe_buffer_unmap(&svga->pipe, transfer);
 256
 257    return ret;
 258 }
 259
 260
 261 static enum pipe_error
 262 emit_fs_consts(struct svga_context *svga, unsigned dirty)
 263 {
 264    const struct svga_shader_result *result = svga->state.hw_draw.fs;
 265    const struct svga_fs_compile_key *key = &result->key.fkey;
 266    enum pipe_error ret = PIPE_OK;
 267
 268    ret = emit_consts( svga, PIPE_SHADER_FRAGMENT );
 269    if (ret != PIPE_OK)
 270       return ret;
 271
 272    /* The internally generated fragment shader for xor blending
 273     * doesn't have a 'result' struct.  It should be fixed to avoid
 274     * this special case, but work around it with a NULL check:
 275     */
 276    if (result != NULL && key->num_unnormalized_coords) {
 277       unsigned offset = result->shader->info.file_max[TGSI_FILE_CONSTANT] + 1;
 278       int i;
 279
 280       for (i = 0; i < key->num_textures; i++) {
 281          if (key->tex[i].unnormalized) {
 282             struct pipe_resource *tex = svga->curr.sampler_views[i]->texture;
 283             float data[4];
 284
 285             data[0] = 1.0 / (float)tex->width0;
 286             data[1] = 1.0 / (float)tex->height0;
 287             data[2] = 1.0;
 288             data[3] = 1.0;
 289
 290             ret = emit_const( svga,
 291                               PIPE_SHADER_FRAGMENT,
 292                               key->tex[i].width_height_idx + offset,
 293                               data );
 294             if (ret != PIPE_OK)
 295                return ret;
 296          }
 297       }
 298
 299       offset += key->num_unnormalized_coords;
 300    }
 301
 302    return PIPE_OK;
 303 }
 304
 305
 306 struct svga_tracked_state svga_hw_fs_constants =
 307 {
 308    "hw fs params",
 309    (SVGA_NEW_FS_CONST_BUFFER |
 310     SVGA_NEW_FS_RESULT |
 311     SVGA_NEW_TEXTURE_BINDING),
 312    emit_fs_consts
 313 };
 314
 315
 316
 317 static enum pipe_error
 318 emit_vs_consts(struct svga_context *svga, unsigned dirty)
 319 {
 320    const struct svga_shader_result *result = svga->state.hw_draw.vs;
 321    const struct svga_vs_compile_key *key = &result->key.vkey;
 322    enum pipe_error ret = PIPE_OK;
 323    unsigned offset;
 324
 325    /* SVGA_NEW_VS_RESULT
 326     */
 327    if (result == NULL)
 328       return PIPE_OK;
 329
 330    /* SVGA_NEW_VS_CONST_BUFFER
 331     */
 332    ret = emit_consts( svga, PIPE_SHADER_VERTEX );
 333    if (ret != PIPE_OK)
 334       return ret;
 335
 336    /* offset = number of constants in the VS const buffer */
 337    offset = result->shader->info.file_max[TGSI_FILE_CONSTANT] + 1;
 338
 339    /* SVGA_NEW_VS_RESULT
 340     * Put the viewport pre-scale/translate values into the const buffer.
 341     */
 342    if (key->need_prescale) {
 343       ret = emit_const( svga, PIPE_SHADER_VERTEX, offset++,
 344                         svga->state.hw_clear.prescale.scale );
 345       if (ret != PIPE_OK)
 346          return ret;
 347
 348       ret = emit_const( svga, PIPE_SHADER_VERTEX, offset++,
 349                         svga->state.hw_clear.prescale.translate );
 350       if (ret != PIPE_OK)
 351          return ret;
 352    }
 353
 354    return PIPE_OK;
 355 }
 356
 357
 358 struct svga_tracked_state svga_hw_vs_constants =
 359 {
 360    "hw vs params",
 361    (SVGA_NEW_PRESCALE |
 362     SVGA_NEW_VS_CONST_BUFFER |
 363     SVGA_NEW_VS_RESULT),
 364    emit_vs_consts
 365 };