src/mesa/state_tracker/st_cb_drawpixels_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_drawpixels.h"
  30 #include "tgsi/tgsi_transform.h"
  31 #include "tgsi/tgsi_scan.h"
  32
  33 struct tgsi_drawpix_transform {
  34    struct tgsi_transform_context base;
  35    struct tgsi_shader_info info;
  36    bool use_texcoord;
  37    bool scale_and_bias;
  38    bool pixel_maps;
  39    bool first_instruction_emitted;
  40    unsigned scale_const;
  41    unsigned bias_const;
  42    unsigned color_temp;
  43    unsigned drawpix_sampler;
  44    unsigned pixelmap_sampler;
  45    unsigned texcoord_const;
  46 };
  47
  48 static inline struct tgsi_drawpix_transform *
  49 tgsi_drawpix_transform(struct tgsi_transform_context *tctx)
  50 {
  51    return (struct tgsi_drawpix_transform *)tctx;
  52 }
  53
  54 static void
  55 set_src(struct tgsi_full_instruction *inst, unsigned i, unsigned file, unsigned index,
  56         unsigned x, unsigned y, unsigned z, unsigned w)
  57 {
  58    inst->Src[i].Register.File  = file;
  59    inst->Src[i].Register.Index = index;
  60    inst->Src[i].Register.SwizzleX = x;
  61    inst->Src[i].Register.SwizzleY = y;
  62    inst->Src[i].Register.SwizzleZ = z;
  63    inst->Src[i].Register.SwizzleW = w;
  64 }
  65
  66 #define SET_SRC(inst, i, file, index, x, y, z, w) \
  67    set_src(inst, i, file, index, TGSI_SWIZZLE_##x, TGSI_SWIZZLE_##y, \
  68            TGSI_SWIZZLE_##z, TGSI_SWIZZLE_##w)
  69
  70 static void
  71 transform_instr(struct tgsi_transform_context *tctx,
  72                 struct tgsi_full_instruction *current_inst)
  73 {
  74    struct tgsi_drawpix_transform *ctx = tgsi_drawpix_transform(tctx);
  75    unsigned i, sem_texcoord = ctx->use_texcoord ? TGSI_SEMANTIC_TEXCOORD :
  76                                                   TGSI_SEMANTIC_GENERIC;
  77    int texcoord_index = -1;
  78
  79    if (ctx->first_instruction_emitted)
  80       goto transform_inst;
  81
  82    ctx->first_instruction_emitted = true;
  83
  84    /* Add scale and bias constants. */
  85    if (ctx->scale_and_bias) {
  86       if (ctx->info.const_file_max[0] < (int)ctx->scale_const) {
  87          tgsi_transform_const_decl(tctx, ctx->scale_const, ctx->scale_const);
  88       }
  89
  90       if (ctx->info.const_file_max[0] < (int)ctx->bias_const) {
  91          tgsi_transform_const_decl(tctx, ctx->bias_const, ctx->bias_const);
  92       }
  93    }
  94
  95    if (ctx->info.const_file_max[0] < (int)ctx->texcoord_const) {
  96       tgsi_transform_const_decl(tctx, ctx->texcoord_const, ctx->texcoord_const);
  97    }
  98
  99    /* Add a new temp. */
 100    ctx->color_temp = ctx->info.file_max[TGSI_FILE_TEMPORARY] + 1;
 101    tgsi_transform_temp_decl(tctx, ctx->color_temp);
 102
 103    /* Add TEXCOORD[texcoord_slot] if it's missing. */
 104    for (i = 0; i < ctx->info.num_inputs; i++) {
 105       if (ctx->info.input_semantic_name[i] == sem_texcoord &&
 106           ctx->info.input_semantic_index[i] == 0) {
 107          texcoord_index = i;
 108          break;
 109       }
 110    }
 111
 112    if (texcoord_index == -1) {
 113       texcoord_index = ctx->info.num_inputs;
 114       tgsi_transform_input_decl(tctx, texcoord_index, sem_texcoord, 0,
 115                                 TGSI_INTERPOLATE_PERSPECTIVE);
 116    }
 117
 118    /* Declare the drawpix sampler if it's missing. */
 119    if (!(ctx->info.samplers_declared & (1 << ctx->drawpix_sampler))) {
 120       tgsi_transform_sampler_decl(tctx, ctx->drawpix_sampler);
 121    }
 122
 123    /* Declare the pixel map sampler if it's missing. */
 124    if (ctx->pixel_maps &&
 125        !(ctx->info.samplers_declared & (1 << ctx->pixelmap_sampler))) {
 126       tgsi_transform_sampler_decl(tctx, ctx->pixelmap_sampler);
 127    }
 128
 129    /* Get initial pixel color from the texture.
 130     * TEX temp, fragment.texcoord[0], texture[0], 2D;
 131     */
 132    tgsi_transform_tex_2d_inst(tctx, TGSI_FILE_TEMPORARY, ctx->color_temp,
 133                               TGSI_FILE_INPUT, texcoord_index,
 134                               ctx->drawpix_sampler);
 135
 136    /* Apply the scale and bias. */
 137    if (ctx->scale_and_bias) {
 138       /* MAD temp, temp, scale, bias; */
 139       tgsi_transform_op3_inst(tctx, TGSI_OPCODE_MAD,
 140                               TGSI_FILE_TEMPORARY, ctx->color_temp,
 141                               TGSI_WRITEMASK_XYZW,
 142                               TGSI_FILE_TEMPORARY, ctx->color_temp,
 143                               TGSI_FILE_CONSTANT, ctx->scale_const,
 144                               TGSI_FILE_CONSTANT, ctx->bias_const);
 145    }
 146
 147    if (ctx->pixel_maps) {
 148       /* do four pixel map look-ups with two TEX instructions: */
 149       struct tgsi_full_instruction inst;
 150
 151       /* TEX temp.xy, temp.xyyy, texture[1], 2D; */
 152       inst = tgsi_default_full_instruction();
 153       inst.Instruction.Opcode = TGSI_OPCODE_TEX;
 154       inst.Instruction.Texture = 1;
 155       inst.Texture.Texture = TGSI_TEXTURE_2D;
 156
 157       inst.Instruction.NumDstRegs = 1;
 158       inst.Dst[0].Register.File  = TGSI_FILE_TEMPORARY;
 159       inst.Dst[0].Register.Index = ctx->color_temp;
 160       inst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XY;
 161
 162       inst.Instruction.NumSrcRegs = 2;
 163       SET_SRC(&inst, 0, TGSI_FILE_TEMPORARY, ctx->color_temp, X, Y, Y, Y);
 164       inst.Src[1].Register.File  = TGSI_FILE_SAMPLER;
 165       inst.Src[1].Register.Index = ctx->pixelmap_sampler;
 166
 167       tctx->emit_instruction(tctx, &inst);
 168
 169       /* TEX temp.zw, temp.zwww, texture[1], 2D; */
 170       inst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_ZW;
 171       SET_SRC(&inst, 0, TGSI_FILE_TEMPORARY, ctx->color_temp, Z, W, W, W);
 172       tctx->emit_instruction(tctx, &inst);
 173    }
 174
 175    /* Now, "color_temp" should be used in place of IN:COLOR0,
 176     * and CONST[texcoord_slot] should be used in place of IN:TEXCOORD0.
 177     */
 178
 179 transform_inst:
 180
 181    for (i = 0; i < current_inst->Instruction.NumSrcRegs; i++) {
 182       struct tgsi_full_src_register *src = &current_inst->Src[i];
 183       unsigned reg = src->Register.Index;
 184
 185       if (src->Register.File != TGSI_FILE_INPUT || src->Register.Indirect)
 186          continue;
 187
 188       if (ctx->info.input_semantic_name[reg] == TGSI_SEMANTIC_COLOR &&
 189           ctx->info.input_semantic_index[reg] == 0) {
 190          src->Register.File = TGSI_FILE_TEMPORARY;
 191          src->Register.Index = ctx->color_temp;
 192       } else if (ctx->info.input_semantic_name[reg] == sem_texcoord &&
 193                  ctx->info.input_semantic_index[reg] == 0) {
 194          src->Register.File = TGSI_FILE_CONSTANT;
 195          src->Register.Index = ctx->texcoord_const;
 196       }
 197    }
 198
 199    tctx->emit_instruction(tctx, current_inst);
 200 }
 201
 202 const struct tgsi_token *
 203 st_get_drawpix_shader(const struct tgsi_token *tokens, bool use_texcoord,
 204                       bool scale_and_bias, unsigned scale_const,
 205                       unsigned bias_const, bool pixel_maps,
 206                       unsigned drawpix_sampler, unsigned pixelmap_sampler,
 207                       unsigned texcoord_const)
 208 {
 209    struct tgsi_drawpix_transform ctx;
 210    struct tgsi_token *newtoks;
 211    int newlen;
 212
 213    memset(&ctx, 0, sizeof(ctx));
 214    ctx.base.transform_instruction = transform_instr;
 215    ctx.use_texcoord = use_texcoord;
 216    ctx.scale_and_bias = scale_and_bias;
 217    ctx.scale_const = scale_const;
 218    ctx.bias_const = bias_const;
 219    ctx.pixel_maps = pixel_maps;
 220    ctx.drawpix_sampler = drawpix_sampler;
 221    ctx.pixelmap_sampler = pixelmap_sampler;
 222    ctx.texcoord_const = texcoord_const;
 223    tgsi_scan_shader(tokens, &ctx.info);
 224
 225    newlen = tgsi_num_tokens(tokens) + 30;
 226    newtoks = tgsi_alloc_tokens(newlen);
 227    if (!newtoks)
 228       return NULL;
 229
 230    tgsi_transform_shader(tokens, newtoks, newlen, &ctx.base);
 231    return newtoks;
 232 }