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

 *

 * Copyright 2007 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, sub license, 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 (including the

 * next paragraph) 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 NON-INFRINGEMENT.

 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.

 *

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

 /*

  * Authors:

  *   Keith Whitwell 

  *   Brian Paul

  */

#include "util/u_math.h"

#include "util/u_memory.h"

#include "pipe/p_shader_tokens.h"

#include "draw_private.h"

#include "draw_context.h"

#include "draw_vs.h"

#include "tgsi/tgsi_parse.h"

#include "tgsi/tgsi_scan.h"

#include "tgsi/tgsi_exec.h"

struct exec_vertex_shader {

   struct draw_vertex_shader base;

   struct tgsi_exec_machine *machine;

};

static struct exec_vertex_shader *exec_vertex_shader( struct draw_vertex_shader *vs )

{

   return (struct exec_vertex_shader *)vs;

}

/* Not required for run_linear.

 */

static void

vs_exec_prepare( struct draw_vertex_shader *shader,

		 struct draw_context *draw )

{

   struct exec_vertex_shader *evs = exec_vertex_shader(shader);

   debug_assert(!draw->llvm);

   /* Specify the vertex program to interpret/execute.

    * Avoid rebinding when possible.

    */

   if (evs->machine->Tokens != shader->state.tokens) {

      tgsi_exec_machine_bind_shader(evs->machine,

                                    shader->state.tokens,

                                    draw->vs.tgsi.sampler);

   }

}

/* Simplified vertex shader interface for the pt paths.  Given the

 * complexity of code-generating all the above operations together,

 * it's time to try doing all the other stuff separately.

 */

static void

vs_exec_run_linear( struct draw_vertex_shader *shader,

		    const float (*input)[4],

		    float (*output)[4],

                    const void *constants[PIPE_MAX_CONSTANT_BUFFERS],

                    const unsigned const_size[PIPE_MAX_CONSTANT_BUFFERS],

		    unsigned count,

		    unsigned input_stride,

		    unsigned output_stride )

{

   struct exec_vertex_shader *evs = exec_vertex_shader(shader);

   struct tgsi_exec_machine *machine = evs->machine;

   unsigned int i, j;

   unsigned slot;

   boolean clamp_vertex_color = shader->draw->rasterizer->clamp_vertex_color;

   debug_assert(!shader->draw->llvm);

   tgsi_exec_set_constant_buffers(machine, PIPE_MAX_CONSTANT_BUFFERS,

                                  constants, const_size);

   if (shader->info.uses_instanceid) {

      unsigned i = machine->SysSemanticToIndex[TGSI_SEMANTIC_INSTANCEID];

      assert(i < Elements(machine->SystemValue));

      for (j = 0; j < TGSI_QUAD_SIZE; j++)

         machine->SystemValue[i].i[j] = shader->draw->instance_id;

   }

   for (i = 0; i < count; i += MAX_TGSI_VERTICES) {

      unsigned int max_vertices = MIN2(MAX_TGSI_VERTICES, count - i);

      /* Swizzle inputs.

       */

      for (j = 0; j < max_vertices; j++) {

#if 0

         debug_printf("%d) Input vert:\n", i + j);

         for (slot = 0; slot < shader->info.num_inputs; slot++) {

            debug_printf("\t%d: %f %f %f %f\n", slot,

			 input[slot][0],

			 input[slot][1],

			 input[slot][2],

			 input[slot][3]);

         }

#endif

         if (shader->info.uses_vertexid) {

            unsigned vid = machine->SysSemanticToIndex[TGSI_SEMANTIC_VERTEXID];

            assert(vid < Elements(machine->SystemValue));

            machine->SystemValue[vid].i[j] = i + j;

            /* XXX this should include base vertex. Where to get it??? */

         }

         if (shader->info.uses_basevertex) {

            unsigned vid = machine->SysSemanticToIndex[TGSI_SEMANTIC_BASEVERTEX];

            assert(vid < Elements(machine->SystemValue));

            machine->SystemValue[vid].i[j] = 0;

            /* XXX Where to get it??? */

         }

         if (shader->info.uses_vertexid_nobase) {

            unsigned vid = machine->SysSemanticToIndex[TGSI_SEMANTIC_VERTEXID_NOBASE];

            assert(vid < Elements(machine->SystemValue));

            machine->SystemValue[vid].i[j] = i + j;

         }

         for (slot = 0; slot < shader->info.num_inputs; slot++) {

#if 0

            assert(!util_is_inf_or_nan(input[slot][0]));

            assert(!util_is_inf_or_nan(input[slot][1]));

            assert(!util_is_inf_or_nan(input[slot][2]));

            assert(!util_is_inf_or_nan(input[slot][3]));

#endif

            machine->Inputs[slot].xyzw[0].f[j] = input[slot][0];

            machine->Inputs[slot].xyzw[1].f[j] = input[slot][1];

            machine->Inputs[slot].xyzw[2].f[j] = input[slot][2];

            machine->Inputs[slot].xyzw[3].f[j] = input[slot][3];

         }

         input = (const float (*)[4])((const char *)input + input_stride);

      }

      tgsi_set_exec_mask(machine,

                         1,

                         max_vertices > 1,

                         max_vertices > 2,

                         max_vertices > 3);

      /* run interpreter */

      tgsi_exec_machine_run( machine );

      /* Unswizzle all output results.

       */

      for (j = 0; j < max_vertices; j++) {

         for (slot = 0; slot < shader->info.num_outputs; slot++) {

            unsigned name = shader->info.output_semantic_name[slot];

            if(clamp_vertex_color &&

                  (name == TGSI_SEMANTIC_COLOR || name == TGSI_SEMANTIC_BCOLOR))

            {

               output[slot][0] = CLAMP(machine->Outputs[slot].xyzw[0].f[j], 0.0f, 1.0f);

               output[slot][1] = CLAMP(machine->Outputs[slot].xyzw[1].f[j], 0.0f, 1.0f);

               output[slot][2] = CLAMP(machine->Outputs[slot].xyzw[2].f[j], 0.0f, 1.0f);

               output[slot][3] = CLAMP(machine->Outputs[slot].xyzw[3].f[j], 0.0f, 1.0f);

            }

            else

            {

               output[slot][0] = machine->Outputs[slot].xyzw[0].f[j];

               output[slot][1] = machine->Outputs[slot].xyzw[1].f[j];

               output[slot][2] = machine->Outputs[slot].xyzw[2].f[j];

               output[slot][3] = machine->Outputs[slot].xyzw[3].f[j];

            }

         }

#if 0

	 debug_printf("%d) Post xform vert:\n", i + j);

	 for (slot = 0; slot < shader->info.num_outputs; slot++) {

	    debug_printf("\t%d: %f %f %f %f\n", slot,

			 output[slot][0],

			 output[slot][1],

			 output[slot][2],

			 output[slot][3]);

            assert(!util_is_inf_or_nan(output[slot][0]));

         }

#endif

	 output = (float (*)[4])((char *)output + output_stride);

      }

   }

}

static void

vs_exec_delete( struct draw_vertex_shader *dvs )

{

   FREE((void*) dvs->state.tokens);

   FREE( dvs );

}

struct draw_vertex_shader *

draw_create_vs_exec(struct draw_context *draw,

		    const struct pipe_shader_state *state)

{

   struct exec_vertex_shader *vs = CALLOC_STRUCT( exec_vertex_shader );

   if (vs == NULL)

      return NULL;

   /* we make a private copy of the tokens */

   vs->base.state.tokens = tgsi_dup_tokens(state->tokens);

   if (!vs->base.state.tokens) {

      FREE(vs);

      return NULL;

   }

   tgsi_scan_shader(state->tokens, &vs->base.info);

   vs->base.state.stream_output = state->stream_output;

   vs->base.draw = draw;

   vs->base.prepare = vs_exec_prepare;

   vs->base.run_linear = vs_exec_run_linear;

   vs->base.delete = vs_exec_delete;

   vs->base.create_variant = draw_vs_create_variant_generic;

   vs->machine = draw->vs.tgsi.machine;

   return &vs->base;

}