Subversion Repositories Kolibri OS

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

 *

 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

 * 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 TUNGSTEN GRAPHICS 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.

 *

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

/**

 * Execute fragment shader using the TGSI interpreter.

 */

#include "sp_context.h"

#include "sp_state.h"

#include "sp_fs.h"

#include "sp_quad.h"

#include "pipe/p_state.h"

#include "pipe/p_defines.h"

#include "util/u_memory.h"

#include "tgsi/tgsi_exec.h"

#include "tgsi/tgsi_parse.h"

/**

 * Subclass of sp_fragment_shader_variant

 */

struct sp_exec_fragment_shader

{

   struct sp_fragment_shader_variant base;

   /* No other members for now */

};

/** cast wrapper */

static INLINE struct sp_exec_fragment_shader *

sp_exec_fragment_shader(const struct sp_fragment_shader_variant *var)

{

   return (struct sp_exec_fragment_shader *) var;

}

static void

exec_prepare( const struct sp_fragment_shader_variant *var,

              struct tgsi_exec_machine *machine,

              struct tgsi_sampler *sampler )

{

   /*

    * Bind tokens/shader to the interpreter's machine state.

    */

   tgsi_exec_machine_bind_shader(machine,

                                 var->tokens,

                                 sampler);

}

/**

 * Compute quad X,Y,Z,W for the four fragments in a quad.

 *

 * This should really be part of the compiled shader.

 */

static void

setup_pos_vector(const struct tgsi_interp_coef *coef,

                 float x, float y,

                 struct tgsi_exec_vector *quadpos)

{

   uint chan;

   /* do X */

   quadpos->xyzw[0].f[0] = x;

   quadpos->xyzw[0].f[1] = x + 1;

   quadpos->xyzw[0].f[2] = x;

   quadpos->xyzw[0].f[3] = x + 1;

   /* do Y */

   quadpos->xyzw[1].f[0] = y;

   quadpos->xyzw[1].f[1] = y;

   quadpos->xyzw[1].f[2] = y + 1;

   quadpos->xyzw[1].f[3] = y + 1;

   /* do Z and W for all fragments in the quad */

   for (chan = 2; chan < 4; chan++) {

      const float dadx = coef->dadx[chan];

      const float dady = coef->dady[chan];

      const float a0 = coef->a0[chan] + dadx * x + dady * y;

      quadpos->xyzw[chan].f[0] = a0;

      quadpos->xyzw[chan].f[1] = a0 + dadx;

      quadpos->xyzw[chan].f[2] = a0 + dady;

      quadpos->xyzw[chan].f[3] = a0 + dadx + dady;

   }

}

/* TODO: hide the machine struct in here somewhere, remove from this

 * interface:

 */

static unsigned

exec_run( const struct sp_fragment_shader_variant *var,

	  struct tgsi_exec_machine *machine,

	  struct quad_header *quad )

{

   /* Compute X, Y, Z, W vals for this quad */

   setup_pos_vector(quad->posCoef,

                    (float)quad->input.x0, (float)quad->input.y0,

                    &machine->QuadPos);

   /* convert 0 to 1.0 and 1 to -1.0 */

   machine->Face = (float) (quad->input.facing * -2 + 1);

   quad->inout.mask &= tgsi_exec_machine_run( machine );

   if (quad->inout.mask == 0)

      return FALSE;

   /* store outputs */

   {

      const ubyte *sem_name = var->info.output_semantic_name;

      const ubyte *sem_index = var->info.output_semantic_index;

      const uint n = var->info.num_outputs;

      uint i;

      for (i = 0; i < n; i++) {

         switch (sem_name[i]) {

         case TGSI_SEMANTIC_COLOR:

            {

               uint cbuf = sem_index[i];

               assert(sizeof(quad->output.color[cbuf]) ==

                      sizeof(machine->Outputs[i]));

               /* copy float[4][4] result */

               memcpy(quad->output.color[cbuf],

                      &machine->Outputs[i],

                      sizeof(quad->output.color[0]) );

            }

            break;

         case TGSI_SEMANTIC_POSITION:

            {

               uint j;

               for (j = 0; j < 4; j++)

                  quad->output.depth[j] = machine->Outputs[i].xyzw[2].f[j];

            }

            break;

         case TGSI_SEMANTIC_STENCIL:

            {

               uint j;

               for (j = 0; j < 4; j++)

                  quad->output.stencil[j] = (unsigned)machine->Outputs[i].xyzw[1].f[j];

            }

            break;

         }

      }

   }

   return TRUE;

}

static void

exec_delete(struct sp_fragment_shader_variant *var,

            struct tgsi_exec_machine *machine)

{

   if (machine->Tokens == var->tokens) {

      tgsi_exec_machine_bind_shader(machine, NULL, NULL);

   }

   FREE( (void *) var->tokens );

   FREE(var);

}

struct sp_fragment_shader_variant *

softpipe_create_fs_variant_exec(struct softpipe_context *softpipe,

                                const struct pipe_shader_state *templ)

{

   struct sp_exec_fragment_shader *shader;

   shader = CALLOC_STRUCT(sp_exec_fragment_shader);

   if (!shader)

      return NULL;

   shader->base.prepare = exec_prepare;

   shader->base.run = exec_run;

   shader->base.delete = exec_delete;

   return &shader->base;

}