src/gallium/drivers/freedreno/ir3/ir3_shader.h

   1 /* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
   2
   3 /*
   4  * Copyright (C) 2014 Rob Clark <robclark@freedesktop.org>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Authors:
  26  *    Rob Clark <robclark@freedesktop.org>
  27  */
  28
  29 #ifndef IR3_SHADER_H_
  30 #define IR3_SHADER_H_
  31
  32 #include "ir3.h"
  33 #include "disasm.h"
  34
  35 typedef uint16_t ir3_semantic;  /* semantic name + index */
  36 static inline ir3_semantic
  37 ir3_semantic_name(uint8_t name, uint16_t index)
  38 {
  39         return (name << 8) | (index & 0xff);
  40 }
  41
  42 static inline uint8_t sem2name(ir3_semantic sem)
  43 {
  44         return sem >> 8;
  45 }
  46
  47 static inline uint16_t sem2idx(ir3_semantic sem)
  48 {
  49         return sem & 0xff;
  50 }
  51
  52 /* Configuration key used to identify a shader variant.. different
  53  * shader variants can be used to implement features not supported
  54  * in hw (two sided color), binning-pass vertex shader, etc.
  55  */
  56 struct ir3_shader_key {
  57         union {
  58                 struct {
  59                         /* do we need to check {v,f}saturate_{s,t,r}? */
  60                         unsigned has_per_samp : 1;
  61
  62                         /*
  63                          * Vertex shader variant parameters:
  64                          */
  65                         unsigned binning_pass : 1;
  66
  67                         /*
  68                          * Fragment shader variant parameters:
  69                          */
  70                         unsigned color_two_side : 1;
  71                         unsigned half_precision : 1;
  72                         /* For rendering to alpha, we need a bit of special handling
  73                          * since the hw always takes gl_FragColor starting from x
  74                          * component, rather than figuring out to take the w component.
  75                          * We could be more clever and generate variants for other
  76                          * render target formats (ie. luminance formats are xxx1), but
  77                          * let's start with this and see how it goes:
  78                          */
  79                         unsigned alpha : 1;
  80                 };
  81                 uint32_t global;
  82         };
  83
  84         /* bitmask of sampler which needs coords clamped for vertex
  85          * shader:
  86          */
  87         uint16_t vsaturate_s, vsaturate_t, vsaturate_r;
  88
  89         /* bitmask of sampler which needs coords clamped for frag
  90          * shader:
  91          */
  92         uint16_t fsaturate_s, fsaturate_t, fsaturate_r;
  93
  94 };
  95
  96 static inline bool
  97 ir3_shader_key_equal(struct ir3_shader_key *a, struct ir3_shader_key *b)
  98 {
  99         /* slow-path if we need to check {v,f}saturate_{s,t,r} */
 100         if (a->has_per_samp || b->has_per_samp)
 101                 return memcmp(a, b, sizeof(struct ir3_shader_key)) == 0;
 102         return a->global == b->global;
 103 }
 104
 105 struct ir3_shader_variant {
 106         struct fd_bo *bo;
 107
 108         struct ir3_shader_key key;
 109
 110         struct ir3_info info;
 111         struct ir3 *ir;
 112
 113         /* the instructions length is in units of instruction groups
 114          * (4 instructions, 8 dwords):
 115          */
 116         unsigned instrlen;
 117
 118         /* the constants length is in units of vec4's, and is the sum of
 119          * the uniforms and the built-in compiler constants
 120          */
 121         unsigned constlen;
 122
 123         /* About Linkage:
 124          *   + Let the frag shader determine the position/compmask for the
 125          *     varyings, since it is the place where we know if the varying
 126          *     is actually used, and if so, which components are used.  So
 127          *     what the hw calls "outloc" is taken from the "inloc" of the
 128          *     frag shader.
 129          *   + From the vert shader, we only need the output regid
 130          */
 131
 132         /* for frag shader, pos_regid holds the frag_pos, ie. what is passed
 133          * to bary.f instructions
 134          */
 135         uint8_t pos_regid;
 136         bool frag_coord, frag_face;
 137
 138         /* varyings/outputs: */
 139         unsigned outputs_count;
 140         struct {
 141                 ir3_semantic semantic;
 142                 uint8_t regid;
 143         } outputs[16 + 2];  /* +POSITION +PSIZE */
 144         bool writes_pos, writes_psize;
 145
 146         /* vertices/inputs: */
 147         unsigned inputs_count;
 148         struct {
 149                 ir3_semantic semantic;
 150                 uint8_t regid;
 151                 uint8_t compmask;
 152                 uint8_t ncomp;
 153                 /* In theory inloc of fs should match outloc of vs.  Or
 154                  * rather the outloc of the vs is 8 plus the offset passed
 155                  * to bary.f.  Presumably that +8 is to account for
 156                  * gl_Position/gl_PointSize?
 157                  *
 158                  * NOTE inloc is currently aligned to 4 (we don't try
 159                  * to pack varyings).  Changing this would likely break
 160                  * assumptions in few places (like setting up of flat
 161                  * shading in fd3_program) so be sure to check all the
 162                  * spots where inloc is used.
 163                  */
 164                 uint8_t inloc;
 165                 uint8_t bary;
 166                 uint8_t interpolate;
 167         } inputs[16 + 2];  /* +POSITION +FACE */
 168
 169         unsigned total_in;       /* sum of inputs (scalar) */
 170
 171         /* do we have one or more texture sample instructions: */
 172         bool has_samp;
 173
 174         /* do we have kill instructions: */
 175         bool has_kill;
 176
 177         /* const reg # of first immediate, ie. 1 == c1
 178          * (not regid, because TGSI thinks in terms of vec4 registers,
 179          * not scalar registers)
 180          */
 181         unsigned first_immediate;
 182         unsigned immediates_count;
 183         struct {
 184                 uint32_t val[4];
 185         } immediates[64];
 186
 187         /* shader variants form a linked list: */
 188         struct ir3_shader_variant *next;
 189
 190         /* replicated here to avoid passing extra ptrs everywhere: */
 191         enum shader_t type;
 192         struct ir3_shader *shader;
 193 };
 194
 195 struct ir3_shader {
 196         enum shader_t type;
 197
 198         struct pipe_context *pctx;
 199         const struct tgsi_token *tokens;
 200
 201         struct ir3_shader_variant *variants;
 202
 203         /* so far, only used for blit_prog shader.. values for
 204          * VPC_VARYING_PS_REPL[i].MODE
 205          */
 206         uint32_t vpsrepl[4];
 207 };
 208
 209
 210 struct ir3_shader * ir3_shader_create(struct pipe_context *pctx,
 211                 const struct tgsi_token *tokens, enum shader_t type);
 212 void ir3_shader_destroy(struct ir3_shader *shader);
 213
 214 struct ir3_shader_variant * ir3_shader_variant(struct ir3_shader *shader,
 215                 struct ir3_shader_key key);
 216
 217 #endif /* IR3_SHADER_H_ */