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  * Execute fragment shader for the four fragments in the quad.
  70  */
  71 static boolean
  72 shade_quad(struct quad_stage *qs, struct quad_header *quad)
  73 {
  74    struct quad_shade_stage *qss = quad_shade_stage( qs );
  75    struct softpipe_context *softpipe = qs->softpipe;
  76    struct tgsi_exec_machine *machine = qss->machine;
  77    boolean z_written;
  78
  79    /* run shader */
  80    quad->inout.mask &= softpipe->fs->run( softpipe->fs, machine, quad );
  81    if (quad->inout.mask == 0)
  82       return FALSE;
  83
  84    /* store outputs */
  85    z_written = FALSE;
  86    {
  87       const ubyte *sem_name = softpipe->fs->info.output_semantic_name;
  88       const ubyte *sem_index = softpipe->fs->info.output_semantic_index;
  89       const uint n = qss->stage.softpipe->fs->info.num_outputs;
  90       uint i;
  91       for (i = 0; i < n; i++) {
  92          switch (sem_name[i]) {
  93          case TGSI_SEMANTIC_COLOR:
  94             {
  95                uint cbuf = sem_index[i];
  96                memcpy(quad->output.color[cbuf],
  97                       &machine->Outputs[i].xyzw[0].f[0],
  98                       sizeof(quad->output.color[0]) );
  99             }
 100             break;
 101          case TGSI_SEMANTIC_POSITION:
 102             {
 103                uint j;
 104                for (j = 0; j < 4; j++) {
 105                   quad->output.depth[j] = machine->Outputs[0].xyzw[2].f[j];
 106                }
 107                z_written = TRUE;
 108             }
 109             break;
 110          }
 111       }
 112    }
 113
 114    return TRUE;
 115 }
 116
 117
 118
 119 static void
 120 coverage_quad(struct quad_stage *qs, struct quad_header *quad)
 121 {
 122    struct softpipe_context *softpipe = qs->softpipe;
 123    uint cbuf;
 124
 125    /* loop over colorbuffer outputs */
 126    for (cbuf = 0; cbuf < softpipe->framebuffer.nr_cbufs; cbuf++) {
 127       float (*quadColor)[4] = quad->output.color[cbuf];
 128       unsigned j;
 129       for (j = 0; j < QUAD_SIZE; j++) {
 130          assert(quad->input.coverage[j] >= 0.0);
 131          assert(quad->input.coverage[j] <= 1.0);
 132          quadColor[3][j] *= quad->input.coverage[j];
 133       }
 134    }
 135 }
 136
 137
 138
 139 static void
 140 shade_quads(struct quad_stage *qs,
 141                  struct quad_header *quads[],
 142                  unsigned nr)
 143 {
 144    struct quad_shade_stage *qss = quad_shade_stage( qs );
 145    struct softpipe_context *softpipe = qs->softpipe;
 146    struct tgsi_exec_machine *machine = qss->machine;
 147
 148    unsigned i, pass = 0;
 149
 150    machine->Consts = softpipe->mapped_constants[PIPE_SHADER_FRAGMENT];
 151    machine->InterpCoefs = quads[0]->coef;
 152
 153    for (i = 0; i < nr; i++) {
 154       if (!shade_quad(qs, quads[i]))
 155          continue;
 156
 157       if (/*do_coverage*/ 0)
 158          coverage_quad( qs, quads[i] );
 159
 160       quads[pass++] = quads[i];
 161    }
 162
 163    if (pass)
 164       qs->next->run(qs->next, quads, pass);
 165 }
 166
 167
 168
 169
 170
 171 /**
 172  * Per-primitive (or per-begin?) setup
 173  */
 174 static void
 175 shade_begin(struct quad_stage *qs)
 176 {
 177    struct quad_shade_stage *qss = quad_shade_stage(qs);
 178    struct softpipe_context *softpipe = qs->softpipe;
 179
 180    softpipe->fs->prepare( softpipe->fs,
 181                           qss->machine,
 182                           (struct tgsi_sampler **)
 183                              softpipe->tgsi.frag_samplers_list );
 184
 185    qs->next->begin(qs->next);
 186 }
 187
 188
 189 static void
 190 shade_destroy(struct quad_stage *qs)
 191 {
 192    struct quad_shade_stage *qss = (struct quad_shade_stage *) qs;
 193
 194    tgsi_exec_machine_destroy(qss->machine);
 195
 196    FREE( qs );
 197 }
 198
 199
 200 struct quad_stage *
 201 sp_quad_shade_stage( struct softpipe_context *softpipe )
 202 {
 203    struct quad_shade_stage *qss = CALLOC_STRUCT(quad_shade_stage);
 204    if (!qss)
 205       goto fail;
 206
 207    qss->stage.softpipe = softpipe;
 208    qss->stage.begin = shade_begin;
 209    qss->stage.run = shade_quads;
 210    qss->stage.destroy = shade_destroy;
 211
 212    qss->machine = tgsi_exec_machine_create();
 213    if (!qss->machine)
 214       goto fail;
 215
 216    return &qss->stage;
 217
 218 fail:
 219    if (qss && qss->machine)
 220       tgsi_exec_machine_destroy(qss->machine);
 221
 222    FREE(qss);
 223    return NULL;
 224 }