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