src/mesa/state_tracker/st_cb_bitmap_shader.c

   1 /**************************************************************************
   2  *
   3  * Copyright (C) 2015 Advanced Micro Devices, Inc.
   4  * Copyright 2007 VMware, Inc.
   5  * 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 VMWARE 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 #include "st_cb_bitmap.h"
  30 #include "tgsi/tgsi_transform.h"
  31 #include "tgsi/tgsi_scan.h"
  32 #include "tgsi/tgsi_dump.h"
  33 #include "util/u_debug.h"
  34
  35 struct tgsi_bitmap_transform {
  36    struct tgsi_transform_context base;
  37    struct tgsi_shader_info info;
  38    unsigned sampler_index;
  39    unsigned tex_target;
  40    bool use_texcoord;
  41    bool swizzle_xxxx;
  42    bool first_instruction_emitted;
  43 };
  44
  45 static inline struct tgsi_bitmap_transform *
  46 tgsi_bitmap_transform(struct tgsi_transform_context *tctx)
  47 {
  48    return (struct tgsi_bitmap_transform *)tctx;
  49 }
  50
  51 static void
  52 transform_instr(struct tgsi_transform_context *tctx,
  53                 struct tgsi_full_instruction *current_inst)
  54 {
  55    struct tgsi_bitmap_transform *ctx = tgsi_bitmap_transform(tctx);
  56    struct tgsi_full_instruction inst;
  57    unsigned tgsi_tex_target = ctx->tex_target == PIPE_TEXTURE_2D
  58       ? TGSI_TEXTURE_2D : TGSI_TEXTURE_RECT;
  59    unsigned i, semantic;
  60    int texcoord_index = -1;
  61
  62    if (ctx->first_instruction_emitted) {
  63       tctx->emit_instruction(tctx, current_inst);
  64       return;
  65    }
  66
  67    ctx->first_instruction_emitted = true;
  68
  69    /* Add TEMP[0] if it's missing. */
  70    if (ctx->info.file_max[TGSI_FILE_TEMPORARY] == -1) {
  71       tgsi_transform_temp_decl(tctx, 0);
  72    }
  73
  74    /* Add TEXCOORD[0] if it's missing. */
  75    semantic = ctx->use_texcoord ? TGSI_SEMANTIC_TEXCOORD :
  76                                   TGSI_SEMANTIC_GENERIC;
  77    for (i = 0; i < ctx->info.num_inputs; i++) {
  78       if (ctx->info.input_semantic_name[i] == semantic &&
  79           ctx->info.input_semantic_index[i] == 0) {
  80          texcoord_index = i;
  81          break;
  82       }
  83    }
  84
  85    if (texcoord_index == -1) {
  86       texcoord_index = ctx->info.num_inputs;
  87       tgsi_transform_input_decl(tctx, texcoord_index,
  88                                 semantic, 0, TGSI_INTERPOLATE_PERSPECTIVE);
  89    }
  90
  91    /* Declare the sampler. */
  92    tgsi_transform_sampler_decl(tctx, ctx->sampler_index);
  93
  94    /* Declare the sampler view. */
  95    tgsi_transform_sampler_view_decl(tctx, ctx->sampler_index,
  96                                     tgsi_tex_target, TGSI_RETURN_TYPE_FLOAT);
  97
  98    /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
  99    tgsi_transform_tex_inst(tctx,
 100                            TGSI_FILE_TEMPORARY, 0,
 101                            TGSI_FILE_INPUT, texcoord_index,
 102                            tgsi_tex_target, ctx->sampler_index);
 103
 104    /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
 105    inst = tgsi_default_full_instruction();
 106    inst.Instruction.Opcode = TGSI_OPCODE_KILL_IF;
 107    inst.Instruction.NumDstRegs = 0;
 108    inst.Instruction.NumSrcRegs = 1;
 109
 110    inst.Src[0].Register.File  = TGSI_FILE_TEMPORARY;
 111    inst.Src[0].Register.Index = 0;
 112    inst.Src[0].Register.Negate = 1;
 113    inst.Src[0].Register.SwizzleX = TGSI_SWIZZLE_X;
 114    if (ctx->swizzle_xxxx) {
 115       inst.Src[0].Register.SwizzleY = TGSI_SWIZZLE_X;
 116       inst.Src[0].Register.SwizzleZ = TGSI_SWIZZLE_X;
 117       inst.Src[0].Register.SwizzleW = TGSI_SWIZZLE_X;
 118    } else {
 119       inst.Src[0].Register.SwizzleY = TGSI_SWIZZLE_Y;
 120       inst.Src[0].Register.SwizzleZ = TGSI_SWIZZLE_Z;
 121       inst.Src[0].Register.SwizzleW = TGSI_SWIZZLE_W;
 122    }
 123    tctx->emit_instruction(tctx, &inst);
 124
 125    /* And emit the instruction we got. */
 126    tctx->emit_instruction(tctx, current_inst);
 127 }
 128
 129 const struct tgsi_token *
 130 st_get_bitmap_shader(const struct tgsi_token *tokens,
 131                      unsigned tex_target, unsigned sampler_index,
 132                      bool use_texcoord, bool swizzle_xxxx)
 133 {
 134    struct tgsi_bitmap_transform ctx;
 135    struct tgsi_token *newtoks;
 136    int newlen;
 137
 138    assert(tex_target == PIPE_TEXTURE_2D ||
 139           tex_target == PIPE_TEXTURE_RECT);
 140
 141    memset(&ctx, 0, sizeof(ctx));
 142    ctx.base.transform_instruction = transform_instr;
 143    ctx.tex_target = tex_target;
 144    ctx.sampler_index = sampler_index;
 145    ctx.use_texcoord = use_texcoord;
 146    ctx.swizzle_xxxx = swizzle_xxxx;
 147    tgsi_scan_shader(tokens, &ctx.info);
 148
 149    newlen = tgsi_num_tokens(tokens) + 20;
 150    newtoks = tgsi_alloc_tokens(newlen);
 151    if (!newtoks)
 152       return NULL;
 153
 154    tgsi_transform_shader(tokens, newtoks, newlen, &ctx.base);
 155    return newtoks;
 156 }