src/mesa/drivers/dri/i965/brw_cc.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a copy of this software and associated documentation files (the
   8  "Software"), to deal in the Software without restriction, including
   9  without limitation the rights to use, copy, modify, merge, publish,
  10  distribute, sublicense, and/or sell copies of the Software, and to
  11  permit persons to whom the Software is furnished to do so, subject to
  12  the following conditions:
  13
  14  The above copyright notice and this permission notice (including the
  15  next paragraph) shall be included in all copies or substantial
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #include "brw_context.h"
  34 #include "brw_state.h"
  35 #include "brw_defines.h"
  36 #include "brw_util.h"
  37 #include "main/macros.h"
  38
  39 static void prepare_cc_vp( struct brw_context *brw )
  40 {
  41    GLcontext *ctx = &brw->intel.ctx;
  42    struct brw_cc_viewport ccv;
  43
  44    memset(&ccv, 0, sizeof(ccv));
  45
  46    /* _NEW_TRANSOFORM */
  47    if (ctx->Transform.DepthClamp) {
  48       /* _NEW_VIEWPORT */
  49       ccv.min_depth = MIN2(ctx->Viewport.Near, ctx->Viewport.Far);
  50       ccv.max_depth = MAX2(ctx->Viewport.Near, ctx->Viewport.Far);
  51    } else {
  52       ccv.min_depth = 0.0;
  53       ccv.max_depth = 1.0;
  54    }
  55
  56    dri_bo_unreference(brw->cc.vp_bo);
  57    brw->cc.vp_bo = brw_cache_data(&brw->cache, BRW_CC_VP, &ccv, sizeof(ccv),
  58                                   NULL, 0);
  59 }
  60
  61 const struct brw_tracked_state brw_cc_vp = {
  62    .dirty = {
  63       .mesa = _NEW_VIEWPORT | _NEW_TRANSFORM,
  64       .brw = BRW_NEW_CONTEXT,
  65       .cache = 0
  66    },
  67    .prepare = prepare_cc_vp
  68 };
  69
  70 struct brw_cc_unit_key {
  71    GLboolean stencil, stencil_two_side, color_blend, alpha_enabled;
  72
  73    GLenum stencil_func[2], stencil_fail_op[2];
  74    GLenum stencil_pass_depth_fail_op[2], stencil_pass_depth_pass_op[2];
  75    GLubyte stencil_ref[2], stencil_write_mask[2], stencil_test_mask[2];
  76    GLenum logic_op;
  77
  78    GLenum blend_eq_rgb, blend_eq_a;
  79    GLenum blend_src_rgb, blend_src_a;
  80    GLenum blend_dst_rgb, blend_dst_a;
  81
  82    GLenum alpha_func;
  83    GLclampf alpha_ref;
  84
  85    GLboolean dither;
  86
  87    GLboolean depth_test, depth_write;
  88    GLenum depth_func;
  89 };
  90
  91 /**
  92  * Modify blend function to force destination alpha to 1.0
  93  *
  94  * If \c function specifies a blend function that uses destination alpha,
  95  * replace it with a function that hard-wires destination alpha to 1.0.  This
  96  * is used when rendering to xRGB targets.
  97  */
  98 static GLenum
  99 fix_xRGB_alpha(GLenum function)
 100 {
 101    switch (function) {
 102    case GL_DST_ALPHA:
 103       return GL_ONE;
 104
 105    case GL_ONE_MINUS_DST_ALPHA:
 106    case GL_SRC_ALPHA_SATURATE:
 107       return GL_ZERO;
 108    }
 109
 110    return function;
 111 }
 112
 113 static void
 114 cc_unit_populate_key(struct brw_context *brw, struct brw_cc_unit_key *key)
 115 {
 116    GLcontext *ctx = &brw->intel.ctx;
 117    const unsigned back = ctx->Stencil._BackFace;
 118
 119    memset(key, 0, sizeof(*key));
 120
 121    key->stencil = ctx->Stencil._Enabled;
 122    key->stencil_two_side = ctx->Stencil._TestTwoSide;
 123
 124    if (key->stencil) {
 125       key->stencil_func[0] = ctx->Stencil.Function[0];
 126       key->stencil_fail_op[0] = ctx->Stencil.FailFunc[0];
 127       key->stencil_pass_depth_fail_op[0] = ctx->Stencil.ZFailFunc[0];
 128       key->stencil_pass_depth_pass_op[0] = ctx->Stencil.ZPassFunc[0];
 129       key->stencil_ref[0] = ctx->Stencil.Ref[0];
 130       key->stencil_write_mask[0] = ctx->Stencil.WriteMask[0];
 131       key->stencil_test_mask[0] = ctx->Stencil.ValueMask[0];
 132    }
 133    if (key->stencil_two_side) {
 134       key->stencil_func[1] = ctx->Stencil.Function[back];
 135       key->stencil_fail_op[1] = ctx->Stencil.FailFunc[back];
 136       key->stencil_pass_depth_fail_op[1] = ctx->Stencil.ZFailFunc[back];
 137       key->stencil_pass_depth_pass_op[1] = ctx->Stencil.ZPassFunc[back];
 138       key->stencil_ref[1] = ctx->Stencil.Ref[back];
 139       key->stencil_write_mask[1] = ctx->Stencil.WriteMask[back];
 140       key->stencil_test_mask[1] = ctx->Stencil.ValueMask[back];
 141    }
 142
 143    if (ctx->Color._LogicOpEnabled)
 144       key->logic_op = ctx->Color.LogicOp;
 145    else
 146       key->logic_op = GL_COPY;
 147
 148    key->color_blend = ctx->Color.BlendEnabled;
 149    if (key->color_blend) {
 150       key->blend_eq_rgb = ctx->Color.BlendEquationRGB;
 151       key->blend_eq_a = ctx->Color.BlendEquationA;
 152       key->blend_src_rgb = ctx->Color.BlendSrcRGB;
 153       key->blend_dst_rgb = ctx->Color.BlendDstRGB;
 154       key->blend_src_a = ctx->Color.BlendSrcA;
 155       key->blend_dst_a = ctx->Color.BlendDstA;
 156
 157       /* If the renderbuffer is XRGB, we have to frob the blend function to
 158        * force the destination alpha to 1.0.  This means replacing GL_DST_ALPHA
 159        * with GL_ONE and GL_ONE_MINUS_DST_ALPHA with GL_ZERO.
 160        */
 161       if (ctx->DrawBuffer->Visual.alphaBits == 0) {
 162          key->blend_src_rgb = fix_xRGB_alpha(key->blend_src_rgb);
 163          key->blend_src_a   = fix_xRGB_alpha(key->blend_src_a);
 164          key->blend_dst_rgb = fix_xRGB_alpha(key->blend_dst_rgb);
 165          key->blend_dst_a   = fix_xRGB_alpha(key->blend_dst_a);
 166       }
 167    }
 168
 169    key->alpha_enabled = ctx->Color.AlphaEnabled;
 170    if (key->alpha_enabled) {
 171       key->alpha_func = ctx->Color.AlphaFunc;
 172       key->alpha_ref = ctx->Color.AlphaRef;
 173    }
 174
 175    key->dither = ctx->Color.DitherFlag;
 176
 177    key->depth_test = ctx->Depth.Test;
 178    if (key->depth_test) {
 179       key->depth_func = ctx->Depth.Func;
 180       key->depth_write = ctx->Depth.Mask;
 181    }
 182 }
 183
 184 /**
 185  * Creates the state cache entry for the given CC unit key.
 186  */
 187 static dri_bo *
 188 cc_unit_create_from_key(struct brw_context *brw, struct brw_cc_unit_key *key)
 189 {
 190    struct brw_cc_unit_state cc;
 191    dri_bo *bo;
 192
 193    memset(&cc, 0, sizeof(cc));
 194
 195    /* _NEW_STENCIL */
 196    if (key->stencil) {
 197       cc.cc0.stencil_enable = 1;
 198       cc.cc0.stencil_func =
 199          intel_translate_compare_func(key->stencil_func[0]);
 200       cc.cc0.stencil_fail_op =
 201          intel_translate_stencil_op(key->stencil_fail_op[0]);
 202       cc.cc0.stencil_pass_depth_fail_op =
 203          intel_translate_stencil_op(key->stencil_pass_depth_fail_op[0]);
 204       cc.cc0.stencil_pass_depth_pass_op =
 205          intel_translate_stencil_op(key->stencil_pass_depth_pass_op[0]);
 206       cc.cc1.stencil_ref = key->stencil_ref[0];
 207       cc.cc1.stencil_write_mask = key->stencil_write_mask[0];
 208       cc.cc1.stencil_test_mask = key->stencil_test_mask[0];
 209
 210       if (key->stencil_two_side) {
 211          cc.cc0.bf_stencil_enable = 1;
 212          cc.cc0.bf_stencil_func =
 213             intel_translate_compare_func(key->stencil_func[1]);
 214          cc.cc0.bf_stencil_fail_op =
 215             intel_translate_stencil_op(key->stencil_fail_op[1]);
 216          cc.cc0.bf_stencil_pass_depth_fail_op =
 217             intel_translate_stencil_op(key->stencil_pass_depth_fail_op[1]);
 218          cc.cc0.bf_stencil_pass_depth_pass_op =
 219             intel_translate_stencil_op(key->stencil_pass_depth_pass_op[1]);
 220          cc.cc1.bf_stencil_ref = key->stencil_ref[1];
 221          cc.cc2.bf_stencil_write_mask = key->stencil_write_mask[1];
 222          cc.cc2.bf_stencil_test_mask = key->stencil_test_mask[1];
 223       }
 224
 225       /* Not really sure about this:
 226        */
 227       if (key->stencil_write_mask[0] ||
 228           (key->stencil_two_side && key->stencil_write_mask[1]))
 229          cc.cc0.stencil_write_enable = 1;
 230    }
 231
 232    /* _NEW_COLOR */
 233    if (key->logic_op != GL_COPY) {
 234       cc.cc2.logicop_enable = 1;
 235       cc.cc5.logicop_func = intel_translate_logic_op(key->logic_op);
 236    } else if (key->color_blend) {
 237       GLenum eqRGB = key->blend_eq_rgb;
 238       GLenum eqA = key->blend_eq_a;
 239       GLenum srcRGB = key->blend_src_rgb;
 240       GLenum dstRGB = key->blend_dst_rgb;
 241       GLenum srcA = key->blend_src_a;
 242       GLenum dstA = key->blend_dst_a;
 243
 244       if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
 245          srcRGB = dstRGB = GL_ONE;
 246       }
 247
 248       if (eqA == GL_MIN || eqA == GL_MAX) {
 249          srcA = dstA = GL_ONE;
 250       }
 251
 252       cc.cc6.dest_blend_factor = brw_translate_blend_factor(dstRGB);
 253       cc.cc6.src_blend_factor = brw_translate_blend_factor(srcRGB);
 254       cc.cc6.blend_function = brw_translate_blend_equation(eqRGB);
 255
 256       cc.cc5.ia_dest_blend_factor = brw_translate_blend_factor(dstA);
 257       cc.cc5.ia_src_blend_factor = brw_translate_blend_factor(srcA);
 258       cc.cc5.ia_blend_function = brw_translate_blend_equation(eqA);
 259
 260       cc.cc3.blend_enable = 1;
 261       cc.cc3.ia_blend_enable = (srcA != srcRGB ||
 262                                 dstA != dstRGB ||
 263                                 eqA != eqRGB);
 264    }
 265
 266    if (key->alpha_enabled) {
 267       cc.cc3.alpha_test = 1;
 268       cc.cc3.alpha_test_func = intel_translate_compare_func(key->alpha_func);
 269       cc.cc3.alpha_test_format = BRW_ALPHATEST_FORMAT_UNORM8;
 270
 271       UNCLAMPED_FLOAT_TO_UBYTE(cc.cc7.alpha_ref.ub[0], key->alpha_ref);
 272    }
 273
 274    if (key->dither) {
 275       cc.cc5.dither_enable = 1;
 276       cc.cc6.y_dither_offset = 0;
 277       cc.cc6.x_dither_offset = 0;
 278    }
 279
 280    /* _NEW_DEPTH */
 281    if (key->depth_test) {
 282       cc.cc2.depth_test = 1;
 283       cc.cc2.depth_test_function = intel_translate_compare_func(key->depth_func);
 284       cc.cc2.depth_write_enable = key->depth_write;
 285    }
 286
 287    /* CACHE_NEW_CC_VP */
 288    cc.cc4.cc_viewport_state_offset = brw->cc.vp_bo->offset >> 5; /* reloc */
 289
 290    if (INTEL_DEBUG & DEBUG_STATS)
 291       cc.cc5.statistics_enable = 1;
 292
 293    bo = brw_upload_cache(&brw->cache, BRW_CC_UNIT,
 294                          key, sizeof(*key),
 295                          &brw->cc.vp_bo, 1,
 296                          &cc, sizeof(cc));
 297
 298    /* Emit CC viewport relocation */
 299    dri_bo_emit_reloc(bo,
 300                      I915_GEM_DOMAIN_INSTRUCTION,
 301                      0,
 302                      0,
 303                      offsetof(struct brw_cc_unit_state, cc4),
 304                      brw->cc.vp_bo);
 305
 306    return bo;
 307 }
 308
 309 static void prepare_cc_unit( struct brw_context *brw )
 310 {
 311    struct brw_cc_unit_key key;
 312
 313    cc_unit_populate_key(brw, &key);
 314
 315    dri_bo_unreference(brw->cc.state_bo);
 316    brw->cc.state_bo = brw_search_cache(&brw->cache, BRW_CC_UNIT,
 317                                        &key, sizeof(key),
 318                                        &brw->cc.vp_bo, 1,
 319                                        NULL);
 320
 321    if (brw->cc.state_bo == NULL)
 322       brw->cc.state_bo = cc_unit_create_from_key(brw, &key);
 323 }
 324
 325 const struct brw_tracked_state brw_cc_unit = {
 326    .dirty = {
 327       .mesa = _NEW_STENCIL | _NEW_COLOR | _NEW_DEPTH,
 328       .brw = 0,
 329       .cache = CACHE_NEW_CC_VP
 330    },
 331    .prepare = prepare_cc_unit,
 332 };
 333
 334
 335