src/gallium/drivers/softpipe/sp_quad_fs.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /* Vertices are just an array of floats, with all the attributes
  29  * packed.  We currently assume a layout like:
  30  *
  31  * attr[0][0..3] - window position
  32  * attr[1..n][0..3] - remaining attributes.
  33  *
  34  * Attributes are assumed to be 4 floats wide but are packed so that
  35  * all the enabled attributes run contiguously.
  36  */
  37
  38 #include "pipe/p_util.h"
  39 #include "pipe/p_defines.h"
  40 #include "pipe/p_shader_tokens.h"
  41
  42 #include "sp_context.h"
  43 #include "sp_state.h"
  44 #include "sp_headers.h"
  45 #include "sp_quad.h"
  46 #include "sp_texture.h"
  47 #include "sp_tex_sample.h"
  48
  49
  50 struct quad_shade_stage
  51 {
  52    struct quad_stage stage;
  53    struct tgsi_sampler samplers[PIPE_MAX_SAMPLERS];
  54    struct tgsi_exec_machine machine;
  55    struct tgsi_exec_vector *inputs, *outputs;
  56 };
  57
  58
  59 /** cast wrapper */
  60 static INLINE struct quad_shade_stage *
  61 quad_shade_stage(struct quad_stage *qs)
  62 {
  63    return (struct quad_shade_stage *) qs;
  64 }
  65
  66
  67
  68 /**
  69  * Execute fragment shader for the four fragments in the quad.
  70  */
  71 static void
  72 shade_quad(
  73    struct quad_stage *qs,
  74    struct quad_header *quad )
  75 {
  76    struct quad_shade_stage *qss = quad_shade_stage( qs );
  77    struct softpipe_context *softpipe = qs->softpipe;
  78    struct tgsi_exec_machine *machine = &qss->machine;
  79    boolean z_written;
  80
  81    /* Consts do not require 16 byte alignment. */
  82    machine->Consts = softpipe->mapped_constants[PIPE_SHADER_FRAGMENT];
  83
  84    machine->InterpCoefs = quad->coef;
  85
  86    /* run shader */
  87    quad->mask &= softpipe->fs->run( softpipe->fs,
  88                                     &qss->machine,
  89                                     quad );
  90
  91    /* store outputs */
  92    z_written = FALSE;
  93    {
  94       const ubyte *sem_name = softpipe->fs->info.output_semantic_name;
  95       const ubyte *sem_index = softpipe->fs->info.output_semantic_index;
  96       const uint n = qss->stage.softpipe->fs->info.num_outputs;
  97       uint i;
  98       for (i = 0; i < n; i++) {
  99          switch (sem_name[i]) {
 100          case TGSI_SEMANTIC_COLOR:
 101             {
 102                uint cbuf = sem_index[i];
 103                memcpy(quad->outputs.color[cbuf],
 104                       &machine->Outputs[i].xyzw[0].f[0],
 105                       sizeof(quad->outputs.color[0]) );
 106             }
 107             break;
 108          case TGSI_SEMANTIC_POSITION:
 109             {
 110                uint j;
 111                for (j = 0; j < 4; j++) {
 112                   quad->outputs.depth[j] = machine->Outputs[0].xyzw[2].f[j];
 113                }
 114                z_written = TRUE;
 115             }
 116             break;
 117          }
 118       }
 119    }
 120
 121    if (!z_written) {
 122       /* compute Z values now, as in the quad earlyz stage */
 123       /* XXX we should really only do this if the earlyz stage is not used */
 124       const float fx = (float) quad->x0;
 125       const float fy = (float) quad->y0;
 126       const float dzdx = quad->posCoef->dadx[2];
 127       const float dzdy = quad->posCoef->dady[2];
 128       const float z0 = quad->posCoef->a0[2] + dzdx * fx + dzdy * fy;
 129
 130       quad->outputs.depth[0] = z0;
 131       quad->outputs.depth[1] = z0 + dzdx;
 132       quad->outputs.depth[2] = z0 + dzdy;
 133       quad->outputs.depth[3] = z0 + dzdx + dzdy;
 134    }
 135
 136    /* shader may cull fragments */
 137    if( quad->mask ) {
 138       qs->next->run( qs->next, quad );
 139    }
 140 }
 141
 142 /**
 143  * Per-primitive (or per-begin?) setup
 144  */
 145 static void shade_begin(struct quad_stage *qs)
 146 {
 147    struct quad_shade_stage *qss = quad_shade_stage(qs);
 148    struct softpipe_context *softpipe = qs->softpipe;
 149    unsigned i;
 150    unsigned num = MAX2(softpipe->num_textures, softpipe->num_samplers);
 151
 152    /* set TGSI sampler state that varies */
 153    for (i = 0; i < num; i++) {
 154       qss->samplers[i].state = softpipe->sampler[i];
 155       qss->samplers[i].texture = softpipe->texture[i];
 156    }
 157
 158    softpipe->fs->prepare( softpipe->fs,
 159                           &qss->machine,
 160                           qss->samplers );
 161
 162    qs->next->begin(qs->next);
 163 }
 164
 165
 166 static void shade_destroy(struct quad_stage *qs)
 167 {
 168    struct quad_shade_stage *qss = (struct quad_shade_stage *) qs;
 169
 170    tgsi_exec_machine_free_data(&qss->machine);
 171    FREE( qss->inputs );
 172    FREE( qss->outputs );
 173    FREE( qs );
 174 }
 175
 176
 177 struct quad_stage *sp_quad_shade_stage( struct softpipe_context *softpipe )
 178 {
 179    struct quad_shade_stage *qss = CALLOC_STRUCT(quad_shade_stage);
 180    uint i;
 181
 182    /* allocate storage for program inputs/outputs, aligned to 16 bytes */
 183    qss->inputs = MALLOC(PIPE_MAX_ATTRIBS * sizeof(*qss->inputs) + 16);
 184    qss->outputs = MALLOC(PIPE_MAX_ATTRIBS * sizeof(*qss->outputs) + 16);
 185    qss->machine.Inputs = align16(qss->inputs);
 186    qss->machine.Outputs = align16(qss->outputs);
 187
 188    qss->stage.softpipe = softpipe;
 189    qss->stage.begin = shade_begin;
 190    qss->stage.run = shade_quad;
 191    qss->stage.destroy = shade_destroy;
 192
 193    /* set TGSI sampler state that's constant */
 194    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 195       assert(softpipe->tex_cache[i]);
 196       qss->samplers[i].get_samples = sp_get_samples;
 197       qss->samplers[i].pipe = &softpipe->pipe;
 198       qss->samplers[i].cache = softpipe->tex_cache[i];
 199    }
 200
 201    tgsi_exec_machine_init( &qss->machine );
 202
 203    return &qss->stage;
 204 }