src/gallium/drivers/svga/svga_tgsi.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
  27 #include "pipe/p_compiler.h"
  28 #include "pipe/p_shader_tokens.h"
  29 #include "pipe/p_defines.h"
  30 #include "tgsi/tgsi_parse.h"
  31 #include "tgsi/tgsi_dump.h"
  32 #include "tgsi/tgsi_scan.h"
  33 #include "util/u_math.h"
  34 #include "util/u_memory.h"
  35 #include "util/u_bitmask.h"
  36
  37 #include "svgadump/svga_shader_dump.h"
  38
  39 #include "svga_context.h"
  40 #include "svga_shader.h"
  41 #include "svga_tgsi.h"
  42 #include "svga_tgsi_emit.h"
  43 #include "svga_debug.h"
  44
  45 #include "svga_hw_reg.h"
  46 #include "svga3d_shaderdefs.h"
  47
  48
  49 /* Sinkhole used only in error conditions.
  50  */
  51 static char err_buf[128];
  52
  53
  54 static boolean
  55 svga_shader_expand(struct svga_shader_emitter *emit)
  56 {
  57    char *new_buf;
  58    unsigned newsize = emit->size * 2;
  59
  60    if (emit->buf != err_buf)
  61       new_buf = REALLOC(emit->buf, emit->size, newsize);
  62    else
  63       new_buf = NULL;
  64
  65    if (!new_buf) {
  66       emit->ptr = err_buf;
  67       emit->buf = err_buf;
  68       emit->size = sizeof(err_buf);
  69       return FALSE;
  70    }
  71
  72    emit->size = newsize;
  73    emit->ptr = new_buf + (emit->ptr - emit->buf);
  74    emit->buf = new_buf;
  75    return TRUE;
  76 }
  77
  78
  79 static inline boolean
  80 reserve(struct svga_shader_emitter *emit, unsigned nr_dwords)
  81 {
  82    if (emit->ptr - emit->buf + nr_dwords * sizeof(unsigned) >= emit->size) {
  83       if (!svga_shader_expand(emit)) {
  84          return FALSE;
  85       }
  86    }
  87
  88    return TRUE;
  89 }
  90
  91
  92 boolean
  93 svga_shader_emit_dword(struct svga_shader_emitter * emit, unsigned dword)
  94 {
  95    if (!reserve(emit, 1))
  96       return FALSE;
  97
  98    *(unsigned *) emit->ptr = dword;
  99    emit->ptr += sizeof dword;
 100    return TRUE;
 101 }
 102
 103
 104 boolean
 105 svga_shader_emit_dwords(struct svga_shader_emitter * emit,
 106                         const unsigned *dwords, unsigned nr)
 107 {
 108    if (!reserve(emit, nr))
 109       return FALSE;
 110
 111    memcpy(emit->ptr, dwords, nr * sizeof *dwords);
 112    emit->ptr += nr * sizeof *dwords;
 113    return TRUE;
 114 }
 115
 116
 117 boolean
 118 svga_shader_emit_opcode(struct svga_shader_emitter * emit, unsigned opcode)
 119 {
 120    SVGA3dShaderInstToken *here;
 121
 122    if (!reserve(emit, 1))
 123       return FALSE;
 124
 125    here = (SVGA3dShaderInstToken *) emit->ptr;
 126    here->value = opcode;
 127
 128    if (emit->insn_offset) {
 129       SVGA3dShaderInstToken *prev =
 130          (SVGA3dShaderInstToken *) (emit->buf + emit->insn_offset);
 131       prev->size = (here - prev) - 1;
 132    }
 133
 134    emit->insn_offset = emit->ptr - emit->buf;
 135    emit->ptr += sizeof(unsigned);
 136    return TRUE;
 137 }
 138
 139
 140 static boolean
 141 svga_shader_emit_header(struct svga_shader_emitter *emit)
 142 {
 143    SVGA3dShaderVersion header;
 144
 145    memset(&header, 0, sizeof header);
 146
 147    switch (emit->unit) {
 148    case PIPE_SHADER_FRAGMENT:
 149       header.value = SVGA3D_PS_30;
 150       break;
 151    case PIPE_SHADER_VERTEX:
 152       header.value = SVGA3D_VS_30;
 153       break;
 154    }
 155
 156    return svga_shader_emit_dword(emit, header.value);
 157 }
 158
 159
 160 /**
 161  * Parse TGSI shader and translate to SVGA/DX9 serialized
 162  * representation.
 163  *
 164  * In this function SVGA shader is emitted to an in-memory buffer that
 165  * can be dynamically grown.  Once we've finished and know how large
 166  * it is, it will be copied to a hardware buffer for upload.
 167  */
 168 struct svga_shader_variant *
 169 svga_tgsi_vgpu9_translate(struct svga_context *svga,
 170                           const struct svga_shader *shader,
 171                           const struct svga_compile_key *key, unsigned unit)
 172 {
 173    struct svga_shader_variant *variant = NULL;
 174    struct svga_shader_emitter emit;
 175
 176    memset(&emit, 0, sizeof(emit));
 177
 178    emit.size = 1024;
 179    emit.buf = MALLOC(emit.size);
 180    if (emit.buf == NULL) {
 181       goto fail;
 182    }
 183
 184    emit.ptr = emit.buf;
 185    emit.unit = unit;
 186    emit.key = *key;
 187
 188    tgsi_scan_shader(shader->tokens, &emit.info);
 189
 190    emit.imm_start = emit.info.file_max[TGSI_FILE_CONSTANT] + 1;
 191
 192    if (unit == PIPE_SHADER_FRAGMENT)
 193       emit.imm_start += key->num_unnormalized_coords;
 194
 195    if (unit == PIPE_SHADER_VERTEX) {
 196       emit.imm_start += key->vs.need_prescale ? 2 : 0;
 197    }
 198
 199    emit.nr_hw_float_const =
 200       (emit.imm_start + emit.info.file_max[TGSI_FILE_IMMEDIATE] + 1);
 201
 202    emit.nr_hw_temp = emit.info.file_max[TGSI_FILE_TEMPORARY] + 1;
 203
 204    if (emit.nr_hw_temp >= SVGA3D_TEMPREG_MAX) {
 205       debug_printf("svga: too many temporary registers (%u)\n",
 206                    emit.nr_hw_temp);
 207       goto fail;
 208    }
 209
 210    emit.in_main_func = TRUE;
 211
 212    if (!svga_shader_emit_header(&emit)) {
 213       debug_printf("svga: emit header failed\n");
 214       goto fail;
 215    }
 216
 217    if (!svga_shader_emit_instructions(&emit, shader->tokens)) {
 218       debug_printf("svga: emit instructions failed\n");
 219       goto fail;
 220    }
 221
 222    variant = svga_new_shader_variant(svga);
 223    if (!variant)
 224       goto fail;
 225
 226    variant->shader = shader;
 227    variant->tokens = (const unsigned *) emit.buf;
 228    variant->nr_tokens = (emit.ptr - emit.buf) / sizeof(unsigned);
 229    memcpy(&variant->key, key, sizeof(*key));
 230    variant->id = UTIL_BITMASK_INVALID_INDEX;
 231
 232    variant->pstipple_sampler_unit = emit.pstipple_sampler_unit;
 233
 234    /* If there was exactly one write to a fragment shader output register
 235     * and it came from a constant buffer, we know all fragments will have
 236     * the same color (except for blending).
 237     */
 238    variant->constant_color_output =
 239       emit.constant_color_output && emit.num_output_writes == 1;
 240
 241 #if 0
 242    if (!svga_shader_verify(variant->tokens, variant->nr_tokens) ||
 243        SVGA_DEBUG & DEBUG_TGSI) {
 244       debug_printf("#####################################\n");
 245       debug_printf("Shader %u below\n", shader->id);
 246       tgsi_dump(shader->tokens, 0);
 247       if (SVGA_DEBUG & DEBUG_TGSI) {
 248          debug_printf("Shader %u compiled below\n", shader->id);
 249          svga_shader_dump(variant->tokens, variant->nr_tokens, FALSE);
 250       }
 251       debug_printf("#####################################\n");
 252    }
 253 #endif
 254
 255    return variant;
 256
 257  fail:
 258    FREE(variant);
 259    if (emit.buf != err_buf)
 260       FREE(emit.buf);
 261    return NULL;
 262 }