src/mesa/drivers/dri/nouveau/nv04_state_frag.c

   1 /*
   2  * Copyright (C) 2009 Francisco Jerez.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial
  15  * portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  */
  26
  27 #include "nouveau_driver.h"
  28 #include "nouveau_context.h"
  29 #include "nouveau_util.h"
  30 #include "nv_object.xml.h"
  31 #include "nv04_3d.xml.h"
  32 #include "nv04_driver.h"
  33
  34 #define COMBINER_SHIFT(in)                                              \
  35         (NV04_MULTITEX_TRIANGLE_COMBINE_COLOR_ARGUMENT##in##__SHIFT     \
  36          - NV04_MULTITEX_TRIANGLE_COMBINE_COLOR_ARGUMENT0__SHIFT)
  37 #define COMBINER_SOURCE(reg)                                    \
  38         NV04_MULTITEX_TRIANGLE_COMBINE_COLOR_ARGUMENT0_##reg
  39 #define COMBINER_INVERT                                 \
  40         NV04_MULTITEX_TRIANGLE_COMBINE_COLOR_INVERSE0
  41 #define COMBINER_ALPHA                                  \
  42         NV04_MULTITEX_TRIANGLE_COMBINE_COLOR_ALPHA0
  43
  44 struct combiner_state {
  45         struct gl_context *ctx;
  46         int unit;
  47         GLboolean alpha;
  48         GLboolean premodulate;
  49
  50         /* GL state */
  51         GLenum mode;
  52         GLenum *source;
  53         GLenum *operand;
  54         GLuint logscale;
  55
  56         /* Derived HW state */
  57         uint32_t hw;
  58 };
  59
  60 #define __INIT_COMBINER_ALPHA_A GL_TRUE
  61 #define __INIT_COMBINER_ALPHA_RGB GL_FALSE
  62
  63 /* Initialize a combiner_state struct from the texture unit
  64  * context. */
  65 #define INIT_COMBINER(chan, ctx, rc, i) do {                    \
  66                 struct gl_tex_env_combine_state *c =            \
  67                         ctx->Texture.Unit[i]._CurrentCombine;   \
  68                 (rc)->ctx = ctx;                                \
  69                 (rc)->unit = i;                                 \
  70                 (rc)->alpha = __INIT_COMBINER_ALPHA_##chan;     \
  71                 (rc)->premodulate = c->_NumArgs##chan == 4;     \
  72                 (rc)->mode = c->Mode##chan;                     \
  73                 (rc)->source = c->Source##chan;                 \
  74                 (rc)->operand = c->Operand##chan;               \
  75                 (rc)->logscale = c->ScaleShift##chan;           \
  76                 (rc)->hw = 0;                                   \
  77         } while (0)
  78
  79 /* Get the combiner source for the specified EXT_texture_env_combine
  80  * source. */
  81 static uint32_t
  82 get_input_source(struct combiner_state *rc, int source)
  83 {
  84         switch (source) {
  85         case GL_ZERO:
  86                 return COMBINER_SOURCE(ZERO);
  87
  88         case GL_TEXTURE:
  89                 return rc->unit ? COMBINER_SOURCE(TEXTURE1) :
  90                         COMBINER_SOURCE(TEXTURE0);
  91
  92         case GL_TEXTURE0:
  93                 return COMBINER_SOURCE(TEXTURE0);
  94
  95         case GL_TEXTURE1:
  96                 return COMBINER_SOURCE(TEXTURE1);
  97
  98         case GL_CONSTANT:
  99                 return COMBINER_SOURCE(CONSTANT);
 100
 101         case GL_PRIMARY_COLOR:
 102                 return COMBINER_SOURCE(PRIMARY_COLOR);
 103
 104         case GL_PREVIOUS:
 105                 return rc->unit ? COMBINER_SOURCE(PREVIOUS) :
 106                         COMBINER_SOURCE(PRIMARY_COLOR);
 107
 108         default:
 109                 assert(0);
 110         }
 111 }
 112
 113 /* Get the (possibly inverted) combiner input mapping for the
 114  * specified EXT_texture_env_combine operand. */
 115 #define INVERT 0x1
 116
 117 static uint32_t
 118 get_input_mapping(struct combiner_state *rc, int operand, int flags)
 119 {
 120         int map = 0;
 121
 122         if (!is_color_operand(operand) && !rc->alpha)
 123                 map |= COMBINER_ALPHA;
 124
 125         if (is_negative_operand(operand) == !(flags & INVERT))
 126                 map |= COMBINER_INVERT;
 127
 128         return map;
 129 }
 130
 131 static uint32_t
 132 get_input_arg(struct combiner_state *rc, int arg, int flags)
 133 {
 134         int source = rc->source[arg];
 135         int operand = rc->operand[arg];
 136
 137         /* Fake several unsupported texture formats. */
 138         if (is_texture_source(source)) {
 139                 int i = (source == GL_TEXTURE ?
 140                          rc->unit : source - GL_TEXTURE0);
 141                 struct gl_texture_object *t = rc->ctx->Texture.Unit[i]._Current;
 142                 mesa_format format = t->Image[0][t->BaseLevel]->TexFormat;
 143
 144                 if (format == MESA_FORMAT_A_UNORM8) {
 145                         /* Emulated using I8. */
 146                         if (is_color_operand(operand))
 147                                 return COMBINER_SOURCE(ZERO) |
 148                                         get_input_mapping(rc, operand, flags);
 149
 150                 } else if (format == MESA_FORMAT_L_UNORM8) {
 151                         /* Emulated using I8. */
 152                         if (!is_color_operand(operand))
 153                                 return COMBINER_SOURCE(ZERO) |
 154                                         get_input_mapping(rc, operand,
 155                                                           flags ^ INVERT);
 156                 }
 157         }
 158
 159         return get_input_source(rc, source) |
 160                 get_input_mapping(rc, operand, flags);
 161 }
 162
 163 /* Bind the combiner input <in> to the combiner source <src>,
 164  * possibly inverted. */
 165 #define INPUT_SRC(rc, in, src, flags)                                   \
 166         (rc)->hw |= ((flags & INVERT ? COMBINER_INVERT : 0) |           \
 167                    COMBINER_SOURCE(src)) << COMBINER_SHIFT(in)
 168
 169 /* Bind the combiner input <in> to the EXT_texture_env_combine
 170  * argument <arg>, possibly inverted. */
 171 #define INPUT_ARG(rc, in, arg, flags)                                   \
 172         (rc)->hw |= get_input_arg(rc, arg, flags) << COMBINER_SHIFT(in)
 173
 174 #define UNSIGNED_OP(rc)                                                 \
 175         (rc)->hw |= ((rc)->logscale ?                                   \
 176                      NV04_MULTITEX_TRIANGLE_COMBINE_COLOR_MAP_SCALE2 :  \
 177                      NV04_MULTITEX_TRIANGLE_COMBINE_COLOR_MAP_IDENTITY)
 178 #define SIGNED_OP(rc)                                                   \
 179         (rc)->hw |= ((rc)->logscale ?                                   \
 180                      NV04_MULTITEX_TRIANGLE_COMBINE_COLOR_MAP_BIAS_SCALE2 : \
 181                      NV04_MULTITEX_TRIANGLE_COMBINE_COLOR_MAP_BIAS)
 182
 183 static void
 184 setup_combiner(struct combiner_state *rc)
 185 {
 186         switch (rc->mode) {
 187         case GL_REPLACE:
 188                 INPUT_ARG(rc, 0, 0, 0);
 189                 INPUT_SRC(rc, 1, ZERO, INVERT);
 190                 INPUT_SRC(rc, 2, ZERO, 0);
 191                 INPUT_SRC(rc, 3, ZERO, 0);
 192                 UNSIGNED_OP(rc);
 193                 break;
 194
 195         case GL_MODULATE:
 196                 INPUT_ARG(rc, 0, 0, 0);
 197                 INPUT_ARG(rc, 1, 1, 0);
 198                 INPUT_SRC(rc, 2, ZERO, 0);
 199                 INPUT_SRC(rc, 3, ZERO, 0);
 200                 UNSIGNED_OP(rc);
 201                 break;
 202
 203         case GL_ADD:
 204         case GL_ADD_SIGNED:
 205                 if (rc->premodulate) {
 206                         INPUT_ARG(rc, 0, 0, 0);
 207                         INPUT_ARG(rc, 1, 1, 0);
 208                         INPUT_ARG(rc, 2, 2, 0);
 209                         INPUT_ARG(rc, 3, 3, 0);
 210                 } else {
 211                         INPUT_ARG(rc, 0, 0, 0);
 212                         INPUT_SRC(rc, 1, ZERO, INVERT);
 213                         INPUT_ARG(rc, 2, 1, 0);
 214                         INPUT_SRC(rc, 3, ZERO, INVERT);
 215                 }
 216
 217                 if (rc->mode == GL_ADD_SIGNED)
 218                         SIGNED_OP(rc);
 219                 else
 220                         UNSIGNED_OP(rc);
 221
 222                 break;
 223
 224         case GL_INTERPOLATE:
 225                 INPUT_ARG(rc, 0, 0, 0);
 226                 INPUT_ARG(rc, 1, 2, 0);
 227                 INPUT_ARG(rc, 2, 1, 0);
 228                 INPUT_ARG(rc, 3, 2, INVERT);
 229                 UNSIGNED_OP(rc);
 230                 break;
 231
 232         default:
 233                 assert(0);
 234         }
 235 }
 236
 237 static unsigned
 238 get_texenv_mode(unsigned mode)
 239 {
 240         switch (mode) {
 241         case GL_REPLACE:
 242                 return 0x1;
 243         case GL_DECAL:
 244                 return 0x3;
 245         case GL_MODULATE:
 246                 return 0x4;
 247         default:
 248                 assert(0);
 249         }
 250 }
 251
 252 void
 253 nv04_emit_tex_env(struct gl_context *ctx, int emit)
 254 {
 255         struct nv04_context *nv04 = to_nv04_context(ctx);
 256         const int i = emit - NOUVEAU_STATE_TEX_ENV0;
 257         struct combiner_state rc_a = {}, rc_c = {};
 258
 259         /* Compute the new combiner state. */
 260         if (ctx->Texture.Unit[i]._Current) {
 261                 INIT_COMBINER(A, ctx, &rc_a, i);
 262                 setup_combiner(&rc_a);
 263
 264                 INIT_COMBINER(RGB, ctx, &rc_c, i);
 265                 setup_combiner(&rc_c);
 266
 267         } else {
 268                 if (i == 0) {
 269                         INPUT_SRC(&rc_a, 0, PRIMARY_COLOR, 0);
 270                         INPUT_SRC(&rc_c, 0, PRIMARY_COLOR, 0);
 271                 } else {
 272                         INPUT_SRC(&rc_a, 0, PREVIOUS, 0);
 273                         INPUT_SRC(&rc_c, 0, PREVIOUS, 0);
 274                 }
 275
 276                 INPUT_SRC(&rc_a, 1, ZERO, INVERT);
 277                 INPUT_SRC(&rc_c, 1, ZERO, INVERT);
 278                 INPUT_SRC(&rc_a, 2, ZERO, 0);
 279                 INPUT_SRC(&rc_c, 2, ZERO, 0);
 280                 INPUT_SRC(&rc_a, 3, ZERO, 0);
 281                 INPUT_SRC(&rc_c, 3, ZERO, 0);
 282
 283                 UNSIGNED_OP(&rc_a);
 284                 UNSIGNED_OP(&rc_c);
 285         }
 286
 287         /* calculate non-multitex state */
 288         nv04->blend &= ~NV04_TEXTURED_TRIANGLE_BLEND_TEXTURE_MAP__MASK;
 289         if (ctx->Texture._MaxEnabledTexImageUnit != -1)
 290                 nv04->blend |= get_texenv_mode(ctx->Texture.Unit[0].EnvMode);
 291         else
 292                 nv04->blend |= get_texenv_mode(GL_MODULATE);
 293
 294         /* update calculated multitex state */
 295         nv04->alpha[i] = rc_a.hw;
 296         nv04->color[i] = rc_c.hw;
 297         nv04->factor   = pack_rgba_f(MESA_FORMAT_B8G8R8A8_UNORM,
 298                                      ctx->Texture.Unit[0].EnvColor);
 299 }