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