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/**********************************************************

 * Copyright 2008-2009 VMware, Inc.  All rights reserved.

 *

 * Permission is hereby granted, free of charge, to any person

 * obtaining a copy of this software and associated documentation

 * files (the "Software"), to deal in the Software without

 * restriction, including without limitation the rights to use, copy,

 * modify, merge, publish, distribute, sublicense, and/or sell copies

 * of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be

 * included in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

 * SOFTWARE.

 *

 **********************************************************/

#include "util/u_inlines.h"

#include "pipe/p_defines.h"

#include "util/u_format.h"

#include "util/u_math.h"

#include "util/u_memory.h"

#include "util/u_bitmask.h"

#include "translate/translate.h"

#include "tgsi/tgsi_ureg.h"

#include "svga_context.h"

#include "svga_state.h"

#include "svga_cmd.h"

#include "svga_shader.h"

#include "svga_tgsi.h"

#include "svga_hw_reg.h"

static INLINE int

compare_vs_keys(const struct svga_vs_compile_key *a,

                const struct svga_vs_compile_key *b)

{

   unsigned keysize = svga_vs_key_size( a );

   return memcmp( a, b, keysize );

}

/** Search for a vertex shader variant */

static struct svga_shader_variant *

search_vs_key(const struct svga_vertex_shader *vs,

              const struct svga_vs_compile_key *key)

{

   struct svga_shader_variant *variant = vs->base.variants;

   assert(key);

   for ( ; variant; variant = variant->next) {

      if (compare_vs_keys( key, &variant->key.vkey ) == 0)

         return variant;

   }

   return NULL;

}

/**

 * If we fail to compile a vertex shader we'll use a dummy/fallback shader

 * that simply emits a (0,0,0,1) vertex position.

 */

static const struct tgsi_token *

get_dummy_vertex_shader(void)

{

   static const float zero[4] = { 0.0, 0.0, 0.0, 1.0 };

   struct ureg_program *ureg;

   const struct tgsi_token *tokens;

   struct ureg_src src;

   struct ureg_dst dst;

   unsigned num_tokens;

   ureg = ureg_create(TGSI_PROCESSOR_VERTEX);

   if (!ureg)

      return NULL;

   dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);

   src = ureg_DECL_immediate(ureg, zero, 4);

   ureg_MOV(ureg, dst, src);

   ureg_END(ureg);

   tokens = ureg_get_tokens(ureg, &num_tokens);

   ureg_destroy(ureg);

   return tokens;

}

/**

 * Replace the given shader's instruction with a simple / dummy shader.

 * We use this when normal shader translation fails.

 */

static struct svga_shader_variant *

get_compiled_dummy_vertex_shader(struct svga_vertex_shader *vs,

                                 const struct svga_vs_compile_key *key)

{

   const struct tgsi_token *dummy = get_dummy_vertex_shader();

   struct svga_shader_variant *variant;

   if (!dummy) {

      return NULL;

   }

   FREE((void *) vs->base.tokens);

   vs->base.tokens = dummy;

   variant = svga_translate_vertex_program(vs, key);

   return variant;

}

/**

 * Translate TGSI shader into an svga shader variant.

 */

static enum pipe_error

compile_vs(struct svga_context *svga,

           struct svga_vertex_shader *vs,

           const struct svga_vs_compile_key *key,

           struct svga_shader_variant **out_variant)

{

   struct svga_shader_variant *variant;

   enum pipe_error ret = PIPE_ERROR;

   variant = svga_translate_vertex_program( vs, key );

   if (variant == NULL) {

      /* some problem during translation, try the dummy shader */

      variant = get_compiled_dummy_vertex_shader(vs, key);

      if (!variant) {

         ret = PIPE_ERROR;

         goto fail;

      }

   }

   if (svga_shader_too_large(svga, variant)) {

      /* too big, use dummy shader */

      debug_printf("Shader too large (%lu bytes),"

                   " using dummy shader instead.\n",

                   (unsigned long ) variant->nr_tokens

                   * sizeof(variant->tokens[0]));

      variant = get_compiled_dummy_vertex_shader(vs, key);

      if (!variant) {

         ret = PIPE_ERROR;

         goto fail;

      }

   }

   ret = svga_define_shader(svga, SVGA3D_SHADERTYPE_VS, variant);

   if (ret != PIPE_OK)

      goto fail;

   *out_variant = variant;

   /* insert variants at head of linked list */

   variant->next = vs->base.variants;

   vs->base.variants = variant;

   return PIPE_OK;

fail:

   if (variant) {

      svga_destroy_shader_variant(svga, SVGA3D_SHADERTYPE_VS, variant);

   }

   return ret;

}

/* SVGA_NEW_PRESCALE, SVGA_NEW_RAST, SVGA_NEW_FS

 */

static void

make_vs_key(struct svga_context *svga, struct svga_vs_compile_key *key)

{

   memset(key, 0, sizeof *key);

   key->need_prescale = svga->state.hw_clear.prescale.enabled;

   key->allow_psiz = svga->curr.rast->templ.point_size_per_vertex;

   /* SVGA_NEW_FS */

   key->fs_generic_inputs = svga->curr.fs->generic_inputs;

   /* SVGA_NEW_VELEMENT */

   key->adjust_attrib_range = svga->curr.velems->adjust_attrib_range;

   key->adjust_attrib_w_1 = svga->curr.velems->adjust_attrib_w_1;

}

/**

 * svga_reemit_vs_bindings - Reemit the vertex shader bindings

 */

enum pipe_error

svga_reemit_vs_bindings(struct svga_context *svga)

{

   enum pipe_error ret;

   struct svga_winsys_gb_shader *gbshader =

      svga->state.hw_draw.vs ? svga->state.hw_draw.vs->gb_shader : NULL;

   assert(svga->rebind.vs);

   assert(svga_have_gb_objects(svga));

   ret = SVGA3D_SetGBShader(svga->swc, SVGA3D_SHADERTYPE_VS, gbshader);

   if (ret != PIPE_OK)

      return ret;

   svga->rebind.vs = FALSE;

   return PIPE_OK;

}

static enum pipe_error

emit_hw_vs(struct svga_context *svga, unsigned dirty)

{

   struct svga_shader_variant *variant = NULL;

   enum pipe_error ret = PIPE_OK;

   /* SVGA_NEW_NEED_SWTNL */

   if (!svga->state.sw.need_swtnl) {

      struct svga_vertex_shader *vs = svga->curr.vs;

      struct svga_vs_compile_key key;

      make_vs_key( svga, &key );

      variant = search_vs_key( vs, &key );

      if (!variant) {

         ret = compile_vs( svga, vs, &key, &variant );

         if (ret != PIPE_OK)

            return ret;

      }

      assert(variant);

   }

   if (variant != svga->state.hw_draw.vs) {

      if (svga_have_gb_objects(svga)) {

         struct svga_winsys_gb_shader *gbshader =

            variant ? variant->gb_shader : NULL;

         ret = SVGA3D_SetGBShader(svga->swc, SVGA3D_SHADERTYPE_VS, gbshader);

         if (ret != PIPE_OK)

            return ret;

         svga->rebind.vs = FALSE;

      }

      else {

         unsigned id = variant ? variant->id : SVGA_ID_INVALID;

         ret = SVGA3D_SetShader(svga->swc, SVGA3D_SHADERTYPE_VS, id);

         if (ret != PIPE_OK)

            return ret;

      }

      svga->dirty |= SVGA_NEW_VS_VARIANT;

      svga->state.hw_draw.vs = variant;

   }

   return PIPE_OK;

}

struct svga_tracked_state svga_hw_vs =

{

   "vertex shader (hwtnl)",

   (SVGA_NEW_VS |

    SVGA_NEW_FS |

    SVGA_NEW_PRESCALE |

    SVGA_NEW_VELEMENT |

    SVGA_NEW_NEED_SWTNL),

   emit_hw_vs

};