src/gallium/drivers/svga/svga_state_vs.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 #include "util/u_format.h"
  29 #include "util/u_math.h"
  30 #include "util/u_memory.h"
  31 #include "util/u_bitmask.h"
  32 #include "translate/translate.h"
  33 #include "tgsi/tgsi_ureg.h"
  34
  35 #include "svga_context.h"
  36 #include "svga_state.h"
  37 #include "svga_cmd.h"
  38 #include "svga_shader.h"
  39 #include "svga_tgsi.h"
  40
  41 #include "svga_hw_reg.h"
  42
  43
  44 static INLINE int
  45 compare_vs_keys(const struct svga_vs_compile_key *a,
  46                 const struct svga_vs_compile_key *b)
  47 {
  48    unsigned keysize = svga_vs_key_size( a );
  49    return memcmp( a, b, keysize );
  50 }
  51
  52
  53 /** Search for a vertex shader variant */
  54 static struct svga_shader_variant *
  55 search_vs_key(const struct svga_vertex_shader *vs,
  56               const struct svga_vs_compile_key *key)
  57 {
  58    struct svga_shader_variant *variant = vs->base.variants;
  59
  60    assert(key);
  61
  62    for ( ; variant; variant = variant->next) {
  63       if (compare_vs_keys( key, &variant->key.vkey ) == 0)
  64          return variant;
  65    }
  66
  67    return NULL;
  68 }
  69
  70
  71 /**
  72  * If we fail to compile a vertex shader we'll use a dummy/fallback shader
  73  * that simply emits a (0,0,0,1) vertex position.
  74  */
  75 static const struct tgsi_token *
  76 get_dummy_vertex_shader(void)
  77 {
  78    static const float zero[4] = { 0.0, 0.0, 0.0, 1.0 };
  79    struct ureg_program *ureg;
  80    const struct tgsi_token *tokens;
  81    struct ureg_src src;
  82    struct ureg_dst dst;
  83    unsigned num_tokens;
  84
  85    ureg = ureg_create(TGSI_PROCESSOR_VERTEX);
  86    if (!ureg)
  87       return NULL;
  88
  89    dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
  90    src = ureg_DECL_immediate(ureg, zero, 4);
  91    ureg_MOV(ureg, dst, src);
  92    ureg_END(ureg);
  93
  94    tokens = ureg_get_tokens(ureg, &num_tokens);
  95
  96    ureg_destroy(ureg);
  97
  98    return tokens;
  99 }
 100
 101
 102 /**
 103  * Replace the given shader's instruction with a simple / dummy shader.
 104  * We use this when normal shader translation fails.
 105  */
 106 static struct svga_shader_variant *
 107 get_compiled_dummy_vertex_shader(struct svga_vertex_shader *vs,
 108                                  const struct svga_vs_compile_key *key)
 109 {
 110    const struct tgsi_token *dummy = get_dummy_vertex_shader();
 111    struct svga_shader_variant *variant;
 112
 113    if (!dummy) {
 114       return NULL;
 115    }
 116
 117    FREE((void *) vs->base.tokens);
 118    vs->base.tokens = dummy;
 119
 120    variant = svga_translate_vertex_program(vs, key);
 121    return variant;
 122 }
 123
 124
 125 /**
 126  * Translate TGSI shader into an svga shader variant.
 127  */
 128 static enum pipe_error
 129 compile_vs(struct svga_context *svga,
 130            struct svga_vertex_shader *vs,
 131            const struct svga_vs_compile_key *key,
 132            struct svga_shader_variant **out_variant)
 133 {
 134    struct svga_shader_variant *variant;
 135    enum pipe_error ret = PIPE_ERROR;
 136
 137    variant = svga_translate_vertex_program( vs, key );
 138    if (variant == NULL) {
 139       /* some problem during translation, try the dummy shader */
 140       variant = get_compiled_dummy_vertex_shader(vs, key);
 141       if (!variant) {
 142          ret = PIPE_ERROR;
 143          goto fail;
 144       }
 145    }
 146
 147    if (svga_shader_too_large(svga, variant)) {
 148       /* too big, use dummy shader */
 149       debug_printf("Shader too large (%lu bytes),"
 150                    " using dummy shader instead.\n",
 151                    (unsigned long ) variant->nr_tokens
 152                    * sizeof(variant->tokens[0]));
 153       variant = get_compiled_dummy_vertex_shader(vs, key);
 154       if (!variant) {
 155          ret = PIPE_ERROR;
 156          goto fail;
 157       }
 158    }
 159
 160    ret = svga_define_shader(svga, SVGA3D_SHADERTYPE_VS, variant);
 161    if (ret != PIPE_OK)
 162       goto fail;
 163
 164    *out_variant = variant;
 165
 166    /* insert variants at head of linked list */
 167    variant->next = vs->base.variants;
 168    vs->base.variants = variant;
 169
 170    return PIPE_OK;
 171
 172 fail:
 173    if (variant) {
 174       svga_destroy_shader_variant(svga, SVGA3D_SHADERTYPE_VS, variant);
 175    }
 176    return ret;
 177 }
 178
 179 /* SVGA_NEW_PRESCALE, SVGA_NEW_RAST, SVGA_NEW_FS
 180  */
 181 static void
 182 make_vs_key(struct svga_context *svga, struct svga_vs_compile_key *key)
 183 {
 184    memset(key, 0, sizeof *key);
 185    key->need_prescale = svga->state.hw_clear.prescale.enabled;
 186    key->allow_psiz = svga->curr.rast->templ.point_size_per_vertex;
 187
 188    /* SVGA_NEW_FS */
 189    key->fs_generic_inputs = svga->curr.fs->generic_inputs;
 190
 191    /* SVGA_NEW_VELEMENT */
 192    key->adjust_attrib_range = svga->curr.velems->adjust_attrib_range;
 193    key->adjust_attrib_w_1 = svga->curr.velems->adjust_attrib_w_1;
 194 }
 195
 196
 197 /**
 198  * svga_reemit_vs_bindings - Reemit the vertex shader bindings
 199  */
 200 enum pipe_error
 201 svga_reemit_vs_bindings(struct svga_context *svga)
 202 {
 203    enum pipe_error ret;
 204    struct svga_winsys_gb_shader *gbshader =
 205       svga->state.hw_draw.vs ? svga->state.hw_draw.vs->gb_shader : NULL;
 206
 207    assert(svga->rebind.vs);
 208    assert(svga_have_gb_objects(svga));
 209
 210    ret = SVGA3D_SetGBShader(svga->swc, SVGA3D_SHADERTYPE_VS, gbshader);
 211    if (ret != PIPE_OK)
 212       return ret;
 213
 214    svga->rebind.vs = FALSE;
 215    return PIPE_OK;
 216 }
 217
 218
 219 static enum pipe_error
 220 emit_hw_vs(struct svga_context *svga, unsigned dirty)
 221 {
 222    struct svga_shader_variant *variant = NULL;
 223    enum pipe_error ret = PIPE_OK;
 224
 225    /* SVGA_NEW_NEED_SWTNL */
 226    if (!svga->state.sw.need_swtnl) {
 227       struct svga_vertex_shader *vs = svga->curr.vs;
 228       struct svga_vs_compile_key key;
 229
 230       make_vs_key( svga, &key );
 231
 232       variant = search_vs_key( vs, &key );
 233       if (!variant) {
 234          ret = compile_vs( svga, vs, &key, &variant );
 235          if (ret != PIPE_OK)
 236             return ret;
 237       }
 238
 239       assert(variant);
 240    }
 241
 242    if (variant != svga->state.hw_draw.vs) {
 243       if (svga_have_gb_objects(svga)) {
 244          struct svga_winsys_gb_shader *gbshader =
 245             variant ? variant->gb_shader : NULL;
 246          ret = SVGA3D_SetGBShader(svga->swc, SVGA3D_SHADERTYPE_VS, gbshader);
 247          if (ret != PIPE_OK)
 248             return ret;
 249
 250          svga->rebind.vs = FALSE;
 251       }
 252       else {
 253          unsigned id = variant ? variant->id : SVGA_ID_INVALID;
 254          ret = SVGA3D_SetShader(svga->swc, SVGA3D_SHADERTYPE_VS, id);
 255          if (ret != PIPE_OK)
 256             return ret;
 257       }
 258
 259       svga->dirty |= SVGA_NEW_VS_VARIANT;
 260       svga->state.hw_draw.vs = variant;
 261    }
 262
 263    return PIPE_OK;
 264 }
 265
 266 struct svga_tracked_state svga_hw_vs =
 267 {
 268    "vertex shader (hwtnl)",
 269    (SVGA_NEW_VS |
 270     SVGA_NEW_FS |
 271     SVGA_NEW_PRESCALE |
 272     SVGA_NEW_VELEMENT |
 273     SVGA_NEW_NEED_SWTNL),
 274    emit_hw_vs
 275 };