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

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics 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 <keithw@vmware.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 #include "main/stencil.h"
  39 #include "intel_batchbuffer.h"
  40
  41 static void
  42 brw_upload_cc_vp(struct brw_context *brw)
  43 {
  44    struct gl_context *ctx = &brw->ctx;
  45    struct brw_cc_viewport *ccv;
  46
  47    ccv = brw_state_batch(brw, AUB_TRACE_CC_VP_STATE,
  48                          sizeof(*ccv) * ctx->Const.MaxViewports, 32,
  49                          &brw->cc.vp_offset);
  50
  51    /* _NEW_TRANSFORM */
  52    for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
  53       if (ctx->Transform.DepthClamp) {
  54          /* _NEW_VIEWPORT */
  55          ccv[i].min_depth = MIN2(ctx->ViewportArray[i].Near,
  56                                  ctx->ViewportArray[i].Far);
  57          ccv[i].max_depth = MAX2(ctx->ViewportArray[i].Near,
  58                                  ctx->ViewportArray[i].Far);
  59       } else {
  60          ccv[i].min_depth = 0.0;
  61          ccv[i].max_depth = 1.0;
  62       }
  63    }
  64
  65    SET_DIRTY_BIT(cache, CACHE_NEW_CC_VP);
  66 }
  67
  68 const struct brw_tracked_state brw_cc_vp = {
  69    .dirty = {
  70       .mesa = _NEW_VIEWPORT | _NEW_TRANSFORM,
  71       .brw = BRW_NEW_BATCH,
  72       .cache = 0
  73    },
  74    .emit = brw_upload_cc_vp
  75 };
  76
  77 /**
  78  * Modify blend function to force destination alpha to 1.0
  79  *
  80  * If \c function specifies a blend function that uses destination alpha,
  81  * replace it with a function that hard-wires destination alpha to 1.0.  This
  82  * is used when rendering to xRGB targets.
  83  */
  84 GLenum
  85 brw_fix_xRGB_alpha(GLenum function)
  86 {
  87    switch (function) {
  88    case GL_DST_ALPHA:
  89       return GL_ONE;
  90
  91    case GL_ONE_MINUS_DST_ALPHA:
  92    case GL_SRC_ALPHA_SATURATE:
  93       return GL_ZERO;
  94    }
  95
  96    return function;
  97 }
  98
  99 /**
 100  * Creates a CC unit packet from the current blend state.
 101  */
 102 static void upload_cc_unit(struct brw_context *brw)
 103 {
 104    struct gl_context *ctx = &brw->ctx;
 105    struct brw_cc_unit_state *cc;
 106
 107    cc = brw_state_batch(brw, AUB_TRACE_CC_STATE,
 108                         sizeof(*cc), 64, &brw->cc.state_offset);
 109    memset(cc, 0, sizeof(*cc));
 110
 111    /* _NEW_STENCIL | _NEW_BUFFERS */
 112    if (ctx->Stencil._Enabled) {
 113       const unsigned back = ctx->Stencil._BackFace;
 114
 115       cc->cc0.stencil_enable = 1;
 116       cc->cc0.stencil_func =
 117          intel_translate_compare_func(ctx->Stencil.Function[0]);
 118       cc->cc0.stencil_fail_op =
 119          intel_translate_stencil_op(ctx->Stencil.FailFunc[0]);
 120       cc->cc0.stencil_pass_depth_fail_op =
 121          intel_translate_stencil_op(ctx->Stencil.ZFailFunc[0]);
 122       cc->cc0.stencil_pass_depth_pass_op =
 123          intel_translate_stencil_op(ctx->Stencil.ZPassFunc[0]);
 124       cc->cc1.stencil_ref = _mesa_get_stencil_ref(ctx, 0);
 125       cc->cc1.stencil_write_mask = ctx->Stencil.WriteMask[0];
 126       cc->cc1.stencil_test_mask = ctx->Stencil.ValueMask[0];
 127
 128       if (ctx->Stencil._TestTwoSide) {
 129          cc->cc0.bf_stencil_enable = 1;
 130          cc->cc0.bf_stencil_func =
 131             intel_translate_compare_func(ctx->Stencil.Function[back]);
 132          cc->cc0.bf_stencil_fail_op =
 133             intel_translate_stencil_op(ctx->Stencil.FailFunc[back]);
 134          cc->cc0.bf_stencil_pass_depth_fail_op =
 135             intel_translate_stencil_op(ctx->Stencil.ZFailFunc[back]);
 136          cc->cc0.bf_stencil_pass_depth_pass_op =
 137             intel_translate_stencil_op(ctx->Stencil.ZPassFunc[back]);
 138          cc->cc1.bf_stencil_ref = _mesa_get_stencil_ref(ctx, back);
 139          cc->cc2.bf_stencil_write_mask = ctx->Stencil.WriteMask[back];
 140          cc->cc2.bf_stencil_test_mask = ctx->Stencil.ValueMask[back];
 141       }
 142
 143       /* Not really sure about this:
 144        */
 145       if (ctx->Stencil.WriteMask[0] ||
 146           (ctx->Stencil._TestTwoSide && ctx->Stencil.WriteMask[back]))
 147          cc->cc0.stencil_write_enable = 1;
 148    }
 149
 150    /* _NEW_COLOR */
 151    if (ctx->Color.ColorLogicOpEnabled && ctx->Color.LogicOp != GL_COPY) {
 152       cc->cc2.logicop_enable = 1;
 153       cc->cc5.logicop_func = intel_translate_logic_op(ctx->Color.LogicOp);
 154    } else if (ctx->Color.BlendEnabled) {
 155       GLenum eqRGB = ctx->Color.Blend[0].EquationRGB;
 156       GLenum eqA = ctx->Color.Blend[0].EquationA;
 157       GLenum srcRGB = ctx->Color.Blend[0].SrcRGB;
 158       GLenum dstRGB = ctx->Color.Blend[0].DstRGB;
 159       GLenum srcA = ctx->Color.Blend[0].SrcA;
 160       GLenum dstA = ctx->Color.Blend[0].DstA;
 161
 162       /* If the renderbuffer is XRGB, we have to frob the blend function to
 163        * force the destination alpha to 1.0.  This means replacing GL_DST_ALPHA
 164        * with GL_ONE and GL_ONE_MINUS_DST_ALPHA with GL_ZERO.
 165        */
 166       if (ctx->DrawBuffer->Visual.alphaBits == 0) {
 167          srcRGB = brw_fix_xRGB_alpha(srcRGB);
 168          srcA   = brw_fix_xRGB_alpha(srcA);
 169          dstRGB = brw_fix_xRGB_alpha(dstRGB);
 170          dstA   = brw_fix_xRGB_alpha(dstA);
 171       }
 172
 173       if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
 174          srcRGB = dstRGB = GL_ONE;
 175       }
 176
 177       if (eqA == GL_MIN || eqA == GL_MAX) {
 178          srcA = dstA = GL_ONE;
 179       }
 180
 181       cc->cc6.dest_blend_factor = brw_translate_blend_factor(dstRGB);
 182       cc->cc6.src_blend_factor = brw_translate_blend_factor(srcRGB);
 183       cc->cc6.blend_function = brw_translate_blend_equation(eqRGB);
 184
 185       cc->cc5.ia_dest_blend_factor = brw_translate_blend_factor(dstA);
 186       cc->cc5.ia_src_blend_factor = brw_translate_blend_factor(srcA);
 187       cc->cc5.ia_blend_function = brw_translate_blend_equation(eqA);
 188
 189       cc->cc3.blend_enable = 1;
 190       cc->cc3.ia_blend_enable = (srcA != srcRGB ||
 191                                 dstA != dstRGB ||
 192                                 eqA != eqRGB);
 193    }
 194
 195    /* _NEW_BUFFERS */
 196    if (ctx->Color.AlphaEnabled && ctx->DrawBuffer->_NumColorDrawBuffers <= 1) {
 197       cc->cc3.alpha_test = 1;
 198       cc->cc3.alpha_test_func =
 199          intel_translate_compare_func(ctx->Color.AlphaFunc);
 200       cc->cc3.alpha_test_format = BRW_ALPHATEST_FORMAT_UNORM8;
 201
 202       UNCLAMPED_FLOAT_TO_UBYTE(cc->cc7.alpha_ref.ub[0], ctx->Color.AlphaRef);
 203    }
 204
 205    if (ctx->Color.DitherFlag) {
 206       cc->cc5.dither_enable = 1;
 207       cc->cc6.y_dither_offset = 0;
 208       cc->cc6.x_dither_offset = 0;
 209    }
 210
 211    /* _NEW_DEPTH */
 212    if (ctx->Depth.Test) {
 213       cc->cc2.depth_test = 1;
 214       cc->cc2.depth_test_function =
 215          intel_translate_compare_func(ctx->Depth.Func);
 216       cc->cc2.depth_write_enable = ctx->Depth.Mask;
 217    }
 218
 219    if (brw->stats_wm || unlikely(INTEL_DEBUG & DEBUG_STATS))
 220       cc->cc5.statistics_enable = 1;
 221
 222    /* CACHE_NEW_CC_VP */
 223    cc->cc4.cc_viewport_state_offset = (brw->batch.bo->offset64 +
 224                                        brw->cc.vp_offset) >> 5; /* reloc */
 225
 226    SET_DIRTY_BIT(cache, CACHE_NEW_CC_UNIT);
 227
 228    /* Emit CC viewport relocation */
 229    drm_intel_bo_emit_reloc(brw->batch.bo,
 230                            (brw->cc.state_offset +
 231                             offsetof(struct brw_cc_unit_state, cc4)),
 232                            brw->batch.bo, brw->cc.vp_offset,
 233                            I915_GEM_DOMAIN_INSTRUCTION, 0);
 234 }
 235
 236 const struct brw_tracked_state brw_cc_unit = {
 237    .dirty = {
 238       .mesa = _NEW_STENCIL | _NEW_COLOR | _NEW_DEPTH | _NEW_BUFFERS,
 239       .brw = BRW_NEW_BATCH | BRW_NEW_STATS_WM,
 240       .cache = CACHE_NEW_CC_VP
 241    },
 242    .emit = upload_cc_unit,
 243 };
 244
 245 static void upload_blend_constant_color(struct brw_context *brw)
 246 {
 247    struct gl_context *ctx = &brw->ctx;
 248
 249    BEGIN_BATCH(5);
 250    OUT_BATCH(_3DSTATE_BLEND_CONSTANT_COLOR << 16 | (5-2));
 251    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[0]);
 252    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[1]);
 253    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[2]);
 254    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[3]);
 255    ADVANCE_BATCH();
 256 }
 257
 258 const struct brw_tracked_state brw_blend_constant_color = {
 259    .dirty = {
 260       .mesa = _NEW_COLOR,
 261       .brw = BRW_NEW_CONTEXT,
 262       .cache = 0
 263    },
 264    .emit = upload_blend_constant_color
 265 };