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         /*
  58          * Vertex shader variant parameters:
  59          */
  60         unsigned binning_pass : 1;
  61
  62         /*
  63          * Fragment shader variant parameters:
  64          */
  65         unsigned color_two_side : 1;
  66         unsigned half_precision : 1;
  67         /* For rendering to alpha, we need a bit of special handling
  68          * since the hw always takes gl_FragColor starting from x
  69          * component, rather than figuring out to take the w component.
  70          * We could be more clever and generate variants for other
  71          * render target formats (ie. luminance formats are xxx1), but
  72          * let's start with this and see how it goes:
  73          */
  74         unsigned alpha : 1;
  75 };
  76
  77 struct ir3_shader_variant {
  78         struct fd_bo *bo;
  79
  80         struct ir3_shader_key key;
  81
  82         struct ir3_info info;
  83         struct ir3 *ir;
  84
  85         /* the instructions length is in units of instruction groups
  86          * (4 instructions, 8 dwords):
  87          */
  88         unsigned instrlen;
  89
  90         /* the constants length is in units of vec4's, and is the sum of
  91          * the uniforms and the built-in compiler constants
  92          */
  93         unsigned constlen;
  94
  95         /* About Linkage:
  96          *   + Let the frag shader determine the position/compmask for the
  97          *     varyings, since it is the place where we know if the varying
  98          *     is actually used, and if so, which components are used.  So
  99          *     what the hw calls "outloc" is taken from the "inloc" of the
 100          *     frag shader.
 101          *   + From the vert shader, we only need the output regid
 102          */
 103
 104         /* for frag shader, pos_regid holds the frag_pos, ie. what is passed
 105          * to bary.f instructions
 106          */
 107         uint8_t pos_regid;
 108         bool frag_coord, frag_face;
 109
 110         /* varyings/outputs: */
 111         unsigned outputs_count;
 112         struct {
 113                 ir3_semantic semantic;
 114                 uint8_t regid;
 115         } outputs[16 + 2];  /* +POSITION +PSIZE */
 116         bool writes_pos, writes_psize;
 117
 118         /* vertices/inputs: */
 119         unsigned inputs_count;
 120         struct {
 121                 ir3_semantic semantic;
 122                 uint8_t regid;
 123                 uint8_t compmask;
 124                 uint8_t ncomp;
 125                 /* in theory inloc of fs should match outloc of vs: */
 126                 uint8_t inloc;
 127                 uint8_t bary;
 128         } inputs[16 + 2];  /* +POSITION +FACE */
 129
 130         unsigned total_in;       /* sum of inputs (scalar) */
 131
 132         /* do we have one or more texture sample instructions: */
 133         bool has_samp;
 134
 135         /* const reg # of first immediate, ie. 1 == c1
 136          * (not regid, because TGSI thinks in terms of vec4 registers,
 137          * not scalar registers)
 138          */
 139         unsigned first_immediate;
 140         unsigned immediates_count;
 141         struct {
 142                 uint32_t val[4];
 143         } immediates[64];
 144
 145         /* shader variants form a linked list: */
 146         struct ir3_shader_variant *next;
 147
 148         /* replicated here to avoid passing extra ptrs everywhere: */
 149         enum shader_t type;
 150         struct ir3_shader *shader;
 151 };
 152
 153 struct ir3_shader {
 154         enum shader_t type;
 155
 156         struct pipe_context *pctx;
 157         const struct tgsi_token *tokens;
 158
 159         struct ir3_shader_variant *variants;
 160
 161         /* so far, only used for blit_prog shader.. values for
 162          * VPC_VARYING_INTERP[i].MODE and VPC_VARYING_PS_REPL[i].MODE
 163          */
 164         uint32_t vinterp[4], vpsrepl[4];
 165 };
 166
 167
 168 struct ir3_shader * ir3_shader_create(struct pipe_context *pctx,
 169                 const struct tgsi_token *tokens, enum shader_t type);
 170 void ir3_shader_destroy(struct ir3_shader *shader);
 171
 172 struct ir3_shader_variant * ir3_shader_variant(struct ir3_shader *shader,
 173                 struct ir3_shader_key key);
 174
 175 #endif /* IR3_SHADER_H_ */