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