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 "intel_fbo.h"
  38 #include "main/macros.h"
  39 #include "main/enums.h"
  40
  41 static void prepare_cc_vp( struct brw_context *brw )
  42 {
  43    GLcontext *ctx = &brw->intel.ctx;
  44    struct brw_cc_viewport ccv;
  45
  46    memset(&ccv, 0, sizeof(ccv));
  47
  48    /* _NEW_TRANSOFORM */
  49    if (ctx->Transform.DepthClamp) {
  50       /* _NEW_VIEWPORT */
  51       ccv.min_depth = MIN2(ctx->Viewport.Near, ctx->Viewport.Far);
  52       ccv.max_depth = MAX2(ctx->Viewport.Near, ctx->Viewport.Far);
  53    } else {
  54       ccv.min_depth = 0.0;
  55       ccv.max_depth = 1.0;
  56    }
  57
  58    dri_bo_unreference(brw->cc.vp_bo);
  59    brw->cc.vp_bo = brw_cache_data(&brw->cache, BRW_CC_VP, &ccv, sizeof(ccv),
  60                                   NULL, 0);
  61 }
  62
  63 const struct brw_tracked_state brw_cc_vp = {
  64    .dirty = {
  65       .mesa = _NEW_VIEWPORT | _NEW_TRANSFORM,
  66       .brw = BRW_NEW_CONTEXT,
  67       .cache = 0
  68    },
  69    .prepare = prepare_cc_vp
  70 };
  71
  72 struct brw_cc_unit_key {
  73    GLboolean stencil, stencil_two_side, color_blend, alpha_enabled;
  74
  75    GLenum stencil_func[2], stencil_fail_op[2];
  76    GLenum stencil_pass_depth_fail_op[2], stencil_pass_depth_pass_op[2];
  77    GLubyte stencil_ref[2], stencil_write_mask[2], stencil_test_mask[2];
  78    GLenum logic_op;
  79
  80    GLenum blend_eq_rgb, blend_eq_a;
  81    GLenum blend_src_rgb, blend_src_a;
  82    GLenum blend_dst_rgb, blend_dst_a;
  83
  84    GLenum alpha_func;
  85    GLclampf alpha_ref;
  86
  87    GLboolean dither;
  88
  89    GLboolean depth_test, depth_write;
  90    GLenum depth_func;
  91 };
  92
  93 /**
  94  * Modify blend function to force destination alpha to 1.0
  95  *
  96  * If \c function specifies a blend function that uses destination alpha,
  97  * replace it with a function that hard-wires destination alpha to 1.0.  This
  98  * is used when rendering to xRGB targets.
  99  */
 100 static GLenum
 101 fix_xRGB_alpha(GLenum function)
 102 {
 103    switch (function) {
 104    case GL_DST_ALPHA:
 105       return GL_ONE;
 106
 107    case GL_ONE_MINUS_DST_ALPHA:
 108    case GL_SRC_ALPHA_SATURATE:
 109       return GL_ZERO;
 110    }
 111
 112    return function;
 113 }
 114
 115 static void
 116 cc_unit_populate_key(struct brw_context *brw, struct brw_cc_unit_key *key)
 117 {
 118    GLcontext *ctx = &brw->intel.ctx;
 119    const unsigned back = ctx->Stencil._BackFace;
 120
 121    memset(key, 0, sizeof(*key));
 122
 123    key->stencil = ctx->Stencil._Enabled;
 124    key->stencil_two_side = ctx->Stencil._TestTwoSide;
 125
 126    if (key->stencil) {
 127       key->stencil_func[0] = ctx->Stencil.Function[0];
 128       key->stencil_fail_op[0] = ctx->Stencil.FailFunc[0];
 129       key->stencil_pass_depth_fail_op[0] = ctx->Stencil.ZFailFunc[0];
 130       key->stencil_pass_depth_pass_op[0] = ctx->Stencil.ZPassFunc[0];
 131       key->stencil_ref[0] = ctx->Stencil.Ref[0];
 132       key->stencil_write_mask[0] = ctx->Stencil.WriteMask[0];
 133       key->stencil_test_mask[0] = ctx->Stencil.ValueMask[0];
 134    }
 135    if (key->stencil_two_side) {
 136       key->stencil_func[1] = ctx->Stencil.Function[back];
 137       key->stencil_fail_op[1] = ctx->Stencil.FailFunc[back];
 138       key->stencil_pass_depth_fail_op[1] = ctx->Stencil.ZFailFunc[back];
 139       key->stencil_pass_depth_pass_op[1] = ctx->Stencil.ZPassFunc[back];
 140       key->stencil_ref[1] = ctx->Stencil.Ref[back];
 141       key->stencil_write_mask[1] = ctx->Stencil.WriteMask[back];
 142       key->stencil_test_mask[1] = ctx->Stencil.ValueMask[back];
 143    }
 144
 145    if (ctx->Color._LogicOpEnabled)
 146       key->logic_op = ctx->Color.LogicOp;
 147    else
 148       key->logic_op = GL_COPY;
 149
 150    key->color_blend = ctx->Color.BlendEnabled;
 151    if (key->color_blend) {
 152       key->blend_eq_rgb = ctx->Color.BlendEquationRGB;
 153       key->blend_eq_a = ctx->Color.BlendEquationA;
 154       key->blend_src_rgb = ctx->Color.BlendSrcRGB;
 155       key->blend_dst_rgb = ctx->Color.BlendDstRGB;
 156       key->blend_src_a = ctx->Color.BlendSrcA;
 157       key->blend_dst_a = ctx->Color.BlendDstA;
 158
 159       /* If the renderbuffer is XRGB, we have to frob the blend function to
 160        * force the destination alpha to 1.0.  This means replacing GL_DST_ALPHA
 161        * with GL_ONE and GL_ONE_MINUS_DST_ALPHA with GL_ZERO.
 162        */
 163       if (ctx->DrawBuffer->Visual.alphaBits == 0) {
 164          key->blend_src_rgb = fix_xRGB_alpha(key->blend_src_rgb);
 165          key->blend_src_a   = fix_xRGB_alpha(key->blend_src_a);
 166          key->blend_dst_rgb = fix_xRGB_alpha(key->blend_dst_rgb);
 167          key->blend_dst_a   = fix_xRGB_alpha(key->blend_dst_a);
 168       }
 169    }
 170
 171    key->alpha_enabled = ctx->Color.AlphaEnabled;
 172    if (key->alpha_enabled) {
 173       key->alpha_func = ctx->Color.AlphaFunc;
 174       key->alpha_ref = ctx->Color.AlphaRef;
 175    }
 176
 177    key->dither = ctx->Color.DitherFlag;
 178
 179    key->depth_test = ctx->Depth.Test;
 180    if (key->depth_test) {
 181       key->depth_func = ctx->Depth.Func;
 182       key->depth_write = ctx->Depth.Mask;
 183    }
 184 }
 185
 186 /**
 187  * Creates the state cache entry for the given CC unit key.
 188  */
 189 static dri_bo *
 190 cc_unit_create_from_key(struct brw_context *brw, struct brw_cc_unit_key *key)
 191 {
 192    struct brw_cc_unit_state cc;
 193    dri_bo *bo;
 194
 195    memset(&cc, 0, sizeof(cc));
 196
 197    /* _NEW_STENCIL */
 198    if (key->stencil) {
 199       cc.cc0.stencil_enable = 1;
 200       cc.cc0.stencil_func =
 201          intel_translate_compare_func(key->stencil_func[0]);
 202       cc.cc0.stencil_fail_op =
 203          intel_translate_stencil_op(key->stencil_fail_op[0]);
 204       cc.cc0.stencil_pass_depth_fail_op =
 205          intel_translate_stencil_op(key->stencil_pass_depth_fail_op[0]);
 206       cc.cc0.stencil_pass_depth_pass_op =
 207          intel_translate_stencil_op(key->stencil_pass_depth_pass_op[0]);
 208       cc.cc1.stencil_ref = key->stencil_ref[0];
 209       cc.cc1.stencil_write_mask = key->stencil_write_mask[0];
 210       cc.cc1.stencil_test_mask = key->stencil_test_mask[0];
 211
 212       if (key->stencil_two_side) {
 213          cc.cc0.bf_stencil_enable = 1;
 214          cc.cc0.bf_stencil_func =
 215             intel_translate_compare_func(key->stencil_func[1]);
 216          cc.cc0.bf_stencil_fail_op =
 217             intel_translate_stencil_op(key->stencil_fail_op[1]);
 218          cc.cc0.bf_stencil_pass_depth_fail_op =
 219             intel_translate_stencil_op(key->stencil_pass_depth_fail_op[1]);
 220          cc.cc0.bf_stencil_pass_depth_pass_op =
 221             intel_translate_stencil_op(key->stencil_pass_depth_pass_op[1]);
 222          cc.cc1.bf_stencil_ref = key->stencil_ref[1];
 223          cc.cc2.bf_stencil_write_mask = key->stencil_write_mask[1];
 224          cc.cc2.bf_stencil_test_mask = key->stencil_test_mask[1];
 225       }
 226
 227       /* Not really sure about this:
 228        */
 229       if (key->stencil_write_mask[0] ||
 230           (key->stencil_two_side && key->stencil_write_mask[1]))
 231          cc.cc0.stencil_write_enable = 1;
 232    }
 233
 234    /* _NEW_COLOR */
 235    if (key->logic_op != GL_COPY) {
 236       cc.cc2.logicop_enable = 1;
 237       cc.cc5.logicop_func = intel_translate_logic_op(key->logic_op);
 238    } else if (key->color_blend) {
 239       GLenum eqRGB = key->blend_eq_rgb;
 240       GLenum eqA = key->blend_eq_a;
 241       GLenum srcRGB = key->blend_src_rgb;
 242       GLenum dstRGB = key->blend_dst_rgb;
 243       GLenum srcA = key->blend_src_a;
 244       GLenum dstA = key->blend_dst_a;
 245
 246       if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
 247          srcRGB = dstRGB = GL_ONE;
 248       }
 249
 250       if (eqA == GL_MIN || eqA == GL_MAX) {
 251          srcA = dstA = GL_ONE;
 252       }
 253
 254       cc.cc6.dest_blend_factor = brw_translate_blend_factor(dstRGB);
 255       cc.cc6.src_blend_factor = brw_translate_blend_factor(srcRGB);
 256       cc.cc6.blend_function = brw_translate_blend_equation(eqRGB);
 257
 258       cc.cc5.ia_dest_blend_factor = brw_translate_blend_factor(dstA);
 259       cc.cc5.ia_src_blend_factor = brw_translate_blend_factor(srcA);
 260       cc.cc5.ia_blend_function = brw_translate_blend_equation(eqA);
 261
 262       cc.cc3.blend_enable = 1;
 263       cc.cc3.ia_blend_enable = (srcA != srcRGB ||
 264                                 dstA != dstRGB ||
 265                                 eqA != eqRGB);
 266    }
 267
 268    if (key->alpha_enabled) {
 269       cc.cc3.alpha_test = 1;
 270       cc.cc3.alpha_test_func = intel_translate_compare_func(key->alpha_func);
 271       cc.cc3.alpha_test_format = BRW_ALPHATEST_FORMAT_UNORM8;
 272
 273       UNCLAMPED_FLOAT_TO_UBYTE(cc.cc7.alpha_ref.ub[0], key->alpha_ref);
 274    }
 275
 276    if (key->dither) {
 277       cc.cc5.dither_enable = 1;
 278       cc.cc6.y_dither_offset = 0;
 279       cc.cc6.x_dither_offset = 0;
 280    }
 281
 282    /* _NEW_DEPTH */
 283    if (key->depth_test) {
 284       cc.cc2.depth_test = 1;
 285       cc.cc2.depth_test_function = intel_translate_compare_func(key->depth_func);
 286       cc.cc2.depth_write_enable = key->depth_write;
 287    }
 288
 289    /* CACHE_NEW_CC_VP */
 290    cc.cc4.cc_viewport_state_offset = brw->cc.vp_bo->offset >> 5; /* reloc */
 291
 292    if (INTEL_DEBUG & DEBUG_STATS)
 293       cc.cc5.statistics_enable = 1;
 294
 295    bo = brw_upload_cache(&brw->cache, BRW_CC_UNIT,
 296                          key, sizeof(*key),
 297                          &brw->cc.vp_bo, 1,
 298                          &cc, sizeof(cc),
 299                          NULL, NULL);
 300
 301    /* Emit CC viewport relocation */
 302    dri_bo_emit_reloc(bo,
 303                      I915_GEM_DOMAIN_INSTRUCTION,
 304                      0,
 305                      0,
 306                      offsetof(struct brw_cc_unit_state, cc4),
 307                      brw->cc.vp_bo);
 308
 309    return bo;
 310 }
 311
 312 static void prepare_cc_unit( struct brw_context *brw )
 313 {
 314    struct brw_cc_unit_key key;
 315
 316    cc_unit_populate_key(brw, &key);
 317
 318    dri_bo_unreference(brw->cc.state_bo);
 319    brw->cc.state_bo = brw_search_cache(&brw->cache, BRW_CC_UNIT,
 320                                        &key, sizeof(key),
 321                                        &brw->cc.vp_bo, 1,
 322                                        NULL);
 323
 324    if (brw->cc.state_bo == NULL)
 325       brw->cc.state_bo = cc_unit_create_from_key(brw, &key);
 326 }
 327
 328 const struct brw_tracked_state brw_cc_unit = {
 329    .dirty = {
 330       .mesa = _NEW_STENCIL | _NEW_COLOR | _NEW_DEPTH,
 331       .brw = 0,
 332       .cache = CACHE_NEW_CC_VP
 333    },
 334    .prepare = prepare_cc_unit,
 335 };
 336
 337
 338