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
  49
  50 struct quad_shade_stage
  51 {
  52    struct quad_stage stage;  /**< base class */
  53
  54    /* no other fields at this time */
  55 };
  56
  57
  58 /** cast wrapper */
  59 static INLINE struct quad_shade_stage *
  60 quad_shade_stage(struct quad_stage *qs)
  61 {
  62    return (struct quad_shade_stage *) qs;
  63 }
  64
  65
  66 /**
  67  * Execute fragment shader for the four fragments in the quad.
  68  * \return TRUE if quad is alive, FALSE if all four pixels are killed
  69  */
  70 static INLINE boolean
  71 shade_quad(struct quad_stage *qs, struct quad_header *quad)
  72 {
  73    struct softpipe_context *softpipe = qs->softpipe;
  74    struct tgsi_exec_machine *machine = softpipe->fs_machine;
  75
  76    /* run shader */
  77    return softpipe->fs->run( softpipe->fs, machine, quad );
  78 }
  79
  80
  81
  82 static void
  83 coverage_quad(struct quad_stage *qs, struct quad_header *quad)
  84 {
  85    struct softpipe_context *softpipe = qs->softpipe;
  86    uint cbuf;
  87
  88    /* loop over colorbuffer outputs */
  89    for (cbuf = 0; cbuf < softpipe->framebuffer.nr_cbufs; cbuf++) {
  90       float (*quadColor)[4] = quad->output.color[cbuf];
  91       unsigned j;
  92       for (j = 0; j < QUAD_SIZE; j++) {
  93          assert(quad->input.coverage[j] >= 0.0);
  94          assert(quad->input.coverage[j] <= 1.0);
  95          quadColor[3][j] *= quad->input.coverage[j];
  96       }
  97    }
  98 }
  99
 100
 101 /**
 102  * Shade/write an array of quads
 103  * Called via quad_stage::run()
 104  */
 105 static void
 106 shade_quads(struct quad_stage *qs,
 107             struct quad_header *quads[],
 108             unsigned nr)
 109 {
 110    struct softpipe_context *softpipe = qs->softpipe;
 111    struct tgsi_exec_machine *machine = softpipe->fs_machine;
 112    unsigned i, nr_quads = 0;
 113
 114    for (i = 0; i < PIPE_MAX_CONSTANT_BUFFERS; i++) {
 115       machine->Consts[i] = softpipe->mapped_constants[PIPE_SHADER_FRAGMENT][i];
 116    }
 117    machine->InterpCoefs = quads[0]->coef;
 118
 119    for (i = 0; i < nr; i++) {
 120       if (!shade_quad(qs, quads[i]))
 121          continue; /* quad totally culled/killed */
 122
 123       if (/*do_coverage*/ 0)
 124          coverage_quad( qs, quads[i] );
 125
 126       quads[nr_quads++] = quads[i];
 127    }
 128
 129    if (nr_quads)
 130       qs->next->run(qs->next, quads, nr_quads);
 131 }
 132
 133
 134 /**
 135  * Per-primitive (or per-begin?) setup
 136  */
 137 static void
 138 shade_begin(struct quad_stage *qs)
 139 {
 140    struct softpipe_context *softpipe = qs->softpipe;
 141
 142    softpipe->fs->prepare( softpipe->fs,
 143                           softpipe->fs_machine,
 144                           (struct tgsi_sampler **)
 145                              softpipe->tgsi.frag_samplers_list );
 146
 147    qs->next->begin(qs->next);
 148 }
 149
 150
 151 static void
 152 shade_destroy(struct quad_stage *qs)
 153 {
 154    FREE( qs );
 155 }
 156
 157
 158 struct quad_stage *
 159 sp_quad_shade_stage( struct softpipe_context *softpipe )
 160 {
 161    struct quad_shade_stage *qss = CALLOC_STRUCT(quad_shade_stage);
 162    if (!qss)
 163       goto fail;
 164
 165    qss->stage.softpipe = softpipe;
 166    qss->stage.begin = shade_begin;
 167    qss->stage.run = shade_quads;
 168    qss->stage.destroy = shade_destroy;
 169
 170    return &qss->stage;
 171
 172 fail:
 173    FREE(qss);
 174    return NULL;
 175 }