src/gallium/drivers/softpipe/sp_quad_fs.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  * Copyright 2008 VMware, Inc.  All rights reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 /* Vertices are just an array of floats, with all the attributes
  30  * packed.  We currently assume a layout like:
  31  *
  32  * attr[0][0..3] - window position
  33  * attr[1..n][0..3] - remaining attributes.
  34  *
  35  * Attributes are assumed to be 4 floats wide but are packed so that
  36  * all the enabled attributes run contiguously.
  37  */
  38
  39 #include "util/u_math.h"
  40 #include "util/u_memory.h"
  41 #include "pipe/p_defines.h"
  42 #include "pipe/p_shader_tokens.h"
  43
  44 #include "sp_context.h"
  45 #include "sp_state.h"
  46 #include "sp_quad.h"
  47 #include "sp_quad_pipe.h"
  48 #include "sp_texture.h"
  49 #include "sp_tex_sample.h"
  50
  51
  52 struct quad_shade_stage
  53 {
  54    struct quad_stage stage;  /**< base class */
  55    struct tgsi_exec_machine machine;
  56    struct tgsi_exec_vector *inputs, *outputs;
  57 };
  58
  59
  60 /** cast wrapper */
  61 static INLINE struct quad_shade_stage *
  62 quad_shade_stage(struct quad_stage *qs)
  63 {
  64    return (struct quad_shade_stage *) qs;
  65 }
  66
  67
  68
  69 /**
  70  * Execute fragment shader for the four fragments in the quad.
  71  */
  72 static void
  73 shade_quad(
  74    struct quad_stage *qs,
  75    struct quad_header *quad )
  76 {
  77    struct quad_shade_stage *qss = quad_shade_stage( qs );
  78    struct softpipe_context *softpipe = qs->softpipe;
  79    struct tgsi_exec_machine *machine = &qss->machine;
  80    boolean z_written;
  81
  82    /* Consts do not require 16 byte alignment. */
  83    machine->Consts = softpipe->mapped_constants[PIPE_SHADER_FRAGMENT];
  84
  85    machine->InterpCoefs = quad->coef;
  86
  87    /* run shader */
  88    quad->inout.mask &= softpipe->fs->run( softpipe->fs,
  89                                     &qss->machine,
  90                                     quad );
  91
  92    /* store outputs */
  93    z_written = FALSE;
  94    {
  95       const ubyte *sem_name = softpipe->fs->info.output_semantic_name;
  96       const ubyte *sem_index = softpipe->fs->info.output_semantic_index;
  97       const uint n = qss->stage.softpipe->fs->info.num_outputs;
  98       uint i;
  99       for (i = 0; i < n; i++) {
 100          switch (sem_name[i]) {
 101          case TGSI_SEMANTIC_COLOR:
 102             {
 103                uint cbuf = sem_index[i];
 104                memcpy(quad->output.color[cbuf],
 105                       &machine->Outputs[i].xyzw[0].f[0],
 106                       sizeof(quad->output.color[0]) );
 107             }
 108             break;
 109          case TGSI_SEMANTIC_POSITION:
 110             {
 111                uint j;
 112                for (j = 0; j < 4; j++) {
 113                   quad->output.depth[j] = machine->Outputs[0].xyzw[2].f[j];
 114                }
 115                z_written = TRUE;
 116             }
 117             break;
 118          }
 119       }
 120    }
 121
 122    if (!z_written) {
 123       /* compute Z values now, as in the quad earlyz stage */
 124       /* XXX we should really only do this if the earlyz stage is not used */
 125       const float fx = (float) quad->input.x0;
 126       const float fy = (float) quad->input.y0;
 127       const float dzdx = quad->posCoef->dadx[2];
 128       const float dzdy = quad->posCoef->dady[2];
 129       const float z0 = quad->posCoef->a0[2] + dzdx * fx + dzdy * fy;
 130
 131       quad->output.depth[0] = z0;
 132       quad->output.depth[1] = z0 + dzdx;
 133       quad->output.depth[2] = z0 + dzdy;
 134       quad->output.depth[3] = z0 + dzdx + dzdy;
 135    }
 136
 137    /* shader may cull fragments */
 138    if( quad->inout.mask ) {
 139       qs->next->run( qs->next, quad );
 140    }
 141 }
 142
 143 /**
 144  * Per-primitive (or per-begin?) setup
 145  */
 146 static void shade_begin(struct quad_stage *qs)
 147 {
 148    struct quad_shade_stage *qss = quad_shade_stage(qs);
 149    struct softpipe_context *softpipe = qs->softpipe;
 150
 151    softpipe->fs->prepare( softpipe->fs,
 152                           &qss->machine,
 153                           (struct tgsi_sampler **)
 154                              softpipe->tgsi.frag_samplers_list );
 155
 156    qs->next->begin(qs->next);
 157 }
 158
 159
 160 static void shade_destroy(struct quad_stage *qs)
 161 {
 162    struct quad_shade_stage *qss = (struct quad_shade_stage *) qs;
 163
 164    tgsi_exec_machine_free_data(&qss->machine);
 165    FREE( qss->inputs );
 166    FREE( qss->outputs );
 167    FREE( qs );
 168 }
 169
 170
 171 struct quad_stage *sp_quad_shade_stage( struct softpipe_context *softpipe )
 172 {
 173    struct quad_shade_stage *qss = CALLOC_STRUCT(quad_shade_stage);
 174
 175    /* allocate storage for program inputs/outputs, aligned to 16 bytes */
 176    qss->inputs = MALLOC(PIPE_MAX_ATTRIBS * sizeof(*qss->inputs) + 16);
 177    qss->outputs = MALLOC(PIPE_MAX_ATTRIBS * sizeof(*qss->outputs) + 16);
 178    qss->machine.Inputs = align16(qss->inputs);
 179    qss->machine.Outputs = align16(qss->outputs);
 180
 181    qss->stage.softpipe = softpipe;
 182    qss->stage.begin = shade_begin;
 183    qss->stage.run = shade_quad;
 184    qss->stage.destroy = shade_destroy;
 185
 186    tgsi_exec_machine_init( &qss->machine );
 187
 188    return &qss->stage;
 189 }