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    if (brw->gen >= 7) {
  66       BEGIN_BATCH(2);
  67       OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_CC << 16 | (2 - 2));
  68       OUT_BATCH(brw->cc.vp_offset);
  69       ADVANCE_BATCH();
  70    } else {
  71       brw->ctx.NewDriverState |= BRW_NEW_CC_VP;
  72    }
  73 }
  74
  75 const struct brw_tracked_state brw_cc_vp = {
  76    .dirty = {
  77       .mesa = _NEW_TRANSFORM |
  78               _NEW_VIEWPORT,
  79       .brw = BRW_NEW_BATCH,
  80    },
  81    .emit = brw_upload_cc_vp
  82 };
  83
  84 /**
  85  * Modify blend function to force destination alpha to 1.0
  86  *
  87  * If \c function specifies a blend function that uses destination alpha,
  88  * replace it with a function that hard-wires destination alpha to 1.0.  This
  89  * is used when rendering to xRGB targets.
  90  */
  91 GLenum
  92 brw_fix_xRGB_alpha(GLenum function)
  93 {
  94    switch (function) {
  95    case GL_DST_ALPHA:
  96       return GL_ONE;
  97
  98    case GL_ONE_MINUS_DST_ALPHA:
  99    case GL_SRC_ALPHA_SATURATE:
 100       return GL_ZERO;
 101    }
 102
 103    return function;
 104 }
 105
 106 /**
 107  * Creates a CC unit packet from the current blend state.
 108  */
 109 static void upload_cc_unit(struct brw_context *brw)
 110 {
 111    struct gl_context *ctx = &brw->ctx;
 112    struct brw_cc_unit_state *cc;
 113
 114    cc = brw_state_batch(brw, AUB_TRACE_CC_STATE,
 115                         sizeof(*cc), 64, &brw->cc.state_offset);
 116    memset(cc, 0, sizeof(*cc));
 117
 118    /* _NEW_STENCIL | _NEW_BUFFERS */
 119    if (ctx->Stencil._Enabled) {
 120       const unsigned back = ctx->Stencil._BackFace;
 121
 122       cc->cc0.stencil_enable = 1;
 123       cc->cc0.stencil_func =
 124          intel_translate_compare_func(ctx->Stencil.Function[0]);
 125       cc->cc0.stencil_fail_op =
 126          intel_translate_stencil_op(ctx->Stencil.FailFunc[0]);
 127       cc->cc0.stencil_pass_depth_fail_op =
 128          intel_translate_stencil_op(ctx->Stencil.ZFailFunc[0]);
 129       cc->cc0.stencil_pass_depth_pass_op =
 130          intel_translate_stencil_op(ctx->Stencil.ZPassFunc[0]);
 131       cc->cc1.stencil_ref = _mesa_get_stencil_ref(ctx, 0);
 132       cc->cc1.stencil_write_mask = ctx->Stencil.WriteMask[0];
 133       cc->cc1.stencil_test_mask = ctx->Stencil.ValueMask[0];
 134
 135       if (ctx->Stencil._TestTwoSide) {
 136          cc->cc0.bf_stencil_enable = 1;
 137          cc->cc0.bf_stencil_func =
 138             intel_translate_compare_func(ctx->Stencil.Function[back]);
 139          cc->cc0.bf_stencil_fail_op =
 140             intel_translate_stencil_op(ctx->Stencil.FailFunc[back]);
 141          cc->cc0.bf_stencil_pass_depth_fail_op =
 142             intel_translate_stencil_op(ctx->Stencil.ZFailFunc[back]);
 143          cc->cc0.bf_stencil_pass_depth_pass_op =
 144             intel_translate_stencil_op(ctx->Stencil.ZPassFunc[back]);
 145          cc->cc1.bf_stencil_ref = _mesa_get_stencil_ref(ctx, back);
 146          cc->cc2.bf_stencil_write_mask = ctx->Stencil.WriteMask[back];
 147          cc->cc2.bf_stencil_test_mask = ctx->Stencil.ValueMask[back];
 148       }
 149
 150       /* Not really sure about this:
 151        */
 152       if (ctx->Stencil.WriteMask[0] ||
 153           (ctx->Stencil._TestTwoSide && ctx->Stencil.WriteMask[back]))
 154          cc->cc0.stencil_write_enable = 1;
 155    }
 156
 157    /* _NEW_COLOR */
 158    if (ctx->Color.ColorLogicOpEnabled && ctx->Color.LogicOp != GL_COPY) {
 159       cc->cc2.logicop_enable = 1;
 160       cc->cc5.logicop_func = intel_translate_logic_op(ctx->Color.LogicOp);
 161    } else if (ctx->Color.BlendEnabled) {
 162       GLenum eqRGB = ctx->Color.Blend[0].EquationRGB;
 163       GLenum eqA = ctx->Color.Blend[0].EquationA;
 164       GLenum srcRGB = ctx->Color.Blend[0].SrcRGB;
 165       GLenum dstRGB = ctx->Color.Blend[0].DstRGB;
 166       GLenum srcA = ctx->Color.Blend[0].SrcA;
 167       GLenum dstA = ctx->Color.Blend[0].DstA;
 168
 169       /* If the renderbuffer is XRGB, we have to frob the blend function to
 170        * force the destination alpha to 1.0.  This means replacing GL_DST_ALPHA
 171        * with GL_ONE and GL_ONE_MINUS_DST_ALPHA with GL_ZERO.
 172        */
 173       if (ctx->DrawBuffer->Visual.alphaBits == 0) {
 174          srcRGB = brw_fix_xRGB_alpha(srcRGB);
 175          srcA   = brw_fix_xRGB_alpha(srcA);
 176          dstRGB = brw_fix_xRGB_alpha(dstRGB);
 177          dstA   = brw_fix_xRGB_alpha(dstA);
 178       }
 179
 180       if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
 181          srcRGB = dstRGB = GL_ONE;
 182       }
 183
 184       if (eqA == GL_MIN || eqA == GL_MAX) {
 185          srcA = dstA = GL_ONE;
 186       }
 187
 188       cc->cc6.dest_blend_factor = brw_translate_blend_factor(dstRGB);
 189       cc->cc6.src_blend_factor = brw_translate_blend_factor(srcRGB);
 190       cc->cc6.blend_function = brw_translate_blend_equation(eqRGB);
 191
 192       cc->cc5.ia_dest_blend_factor = brw_translate_blend_factor(dstA);
 193       cc->cc5.ia_src_blend_factor = brw_translate_blend_factor(srcA);
 194       cc->cc5.ia_blend_function = brw_translate_blend_equation(eqA);
 195
 196       cc->cc3.blend_enable = 1;
 197       cc->cc3.ia_blend_enable = (srcA != srcRGB ||
 198                                 dstA != dstRGB ||
 199                                 eqA != eqRGB);
 200    }
 201
 202    /* _NEW_BUFFERS */
 203    if (ctx->Color.AlphaEnabled && ctx->DrawBuffer->_NumColorDrawBuffers <= 1) {
 204       cc->cc3.alpha_test = 1;
 205       cc->cc3.alpha_test_func =
 206          intel_translate_compare_func(ctx->Color.AlphaFunc);
 207       cc->cc3.alpha_test_format = BRW_ALPHATEST_FORMAT_UNORM8;
 208
 209       UNCLAMPED_FLOAT_TO_UBYTE(cc->cc7.alpha_ref.ub[0], ctx->Color.AlphaRef);
 210    }
 211
 212    if (ctx->Color.DitherFlag) {
 213       cc->cc5.dither_enable = 1;
 214       cc->cc6.y_dither_offset = 0;
 215       cc->cc6.x_dither_offset = 0;
 216    }
 217
 218    /* _NEW_DEPTH */
 219    if (ctx->Depth.Test) {
 220       cc->cc2.depth_test = 1;
 221       cc->cc2.depth_test_function =
 222          intel_translate_compare_func(ctx->Depth.Func);
 223       cc->cc2.depth_write_enable = ctx->Depth.Mask;
 224    }
 225
 226    if (brw->stats_wm || unlikely(INTEL_DEBUG & DEBUG_STATS))
 227       cc->cc5.statistics_enable = 1;
 228
 229    /* BRW_NEW_CC_VP */
 230    cc->cc4.cc_viewport_state_offset = (brw->batch.bo->offset64 +
 231                                        brw->cc.vp_offset) >> 5; /* reloc */
 232
 233    brw->ctx.NewDriverState |= BRW_NEW_GEN4_UNIT_STATE;
 234
 235    /* Emit CC viewport relocation */
 236    drm_intel_bo_emit_reloc(brw->batch.bo,
 237                            (brw->cc.state_offset +
 238                             offsetof(struct brw_cc_unit_state, cc4)),
 239                            brw->batch.bo, brw->cc.vp_offset,
 240                            I915_GEM_DOMAIN_INSTRUCTION, 0);
 241 }
 242
 243 const struct brw_tracked_state brw_cc_unit = {
 244    .dirty = {
 245       .mesa = _NEW_BUFFERS |
 246               _NEW_COLOR |
 247               _NEW_DEPTH |
 248               _NEW_STENCIL,
 249       .brw = BRW_NEW_BATCH |
 250              BRW_NEW_CC_VP |
 251              BRW_NEW_STATS_WM,
 252    },
 253    .emit = upload_cc_unit,
 254 };
 255
 256 static void upload_blend_constant_color(struct brw_context *brw)
 257 {
 258    struct gl_context *ctx = &brw->ctx;
 259
 260    BEGIN_BATCH(5);
 261    OUT_BATCH(_3DSTATE_BLEND_CONSTANT_COLOR << 16 | (5-2));
 262    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[0]);
 263    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[1]);
 264    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[2]);
 265    OUT_BATCH_F(ctx->Color.BlendColorUnclamped[3]);
 266    ADVANCE_BATCH();
 267 }
 268
 269 const struct brw_tracked_state brw_blend_constant_color = {
 270    .dirty = {
 271       .mesa = _NEW_COLOR,
 272       .brw = BRW_NEW_CONTEXT,
 273    },
 274    .emit = upload_blend_constant_color
 275 };