src/mesa/drivers/dri/i915/intel_clear.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 VMware, Inc.
   4  * Copyright 2009 Intel Corporation.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #include "main/glheader.h"
  30 #include "main/mtypes.h"
  31 #include "main/condrender.h"
  32 #include "swrast/swrast.h"
  33 #include "drivers/common/meta.h"
  34
  35 #include "intel_context.h"
  36 #include "intel_blit.h"
  37 #include "intel_clear.h"
  38 #include "intel_fbo.h"
  39 #include "intel_regions.h"
  40
  41 #define FILE_DEBUG_FLAG DEBUG_BLIT
  42
  43 static const char *buffer_names[] = {
  44    [BUFFER_FRONT_LEFT] = "front",
  45    [BUFFER_BACK_LEFT] = "back",
  46    [BUFFER_FRONT_RIGHT] = "front right",
  47    [BUFFER_BACK_RIGHT] = "back right",
  48    [BUFFER_DEPTH] = "depth",
  49    [BUFFER_STENCIL] = "stencil",
  50    [BUFFER_ACCUM] = "accum",
  51    [BUFFER_AUX0] = "aux0",
  52    [BUFFER_COLOR0] = "color0",
  53    [BUFFER_COLOR1] = "color1",
  54    [BUFFER_COLOR2] = "color2",
  55    [BUFFER_COLOR3] = "color3",
  56    [BUFFER_COLOR4] = "color4",
  57    [BUFFER_COLOR5] = "color5",
  58    [BUFFER_COLOR6] = "color6",
  59    [BUFFER_COLOR7] = "color7",
  60 };
  61
  62 static void
  63 debug_mask(const char *name, GLbitfield mask)
  64 {
  65    GLuint i;
  66
  67    if (unlikely(INTEL_DEBUG & DEBUG_BLIT)) {
  68       DBG("%s clear:", name);
  69       for (i = 0; i < BUFFER_COUNT; i++) {
  70          if (mask & (1 << i))
  71             DBG(" %s", buffer_names[i]);
  72       }
  73       DBG("\n");
  74    }
  75 }
  76
  77 /**
  78  * Called by ctx->Driver.Clear.
  79  */
  80 static void
  81 intelClear(struct gl_context *ctx, GLbitfield mask)
  82 {
  83    struct intel_context *intel = intel_context(ctx);
  84    GLuint colorMask;
  85    GLbitfield tri_mask = 0;
  86    GLbitfield blit_mask = 0;
  87    GLbitfield swrast_mask = 0;
  88    struct gl_framebuffer *fb = ctx->DrawBuffer;
  89    struct intel_renderbuffer *irb;
  90    int i;
  91
  92    memcpy(&colorMask, &ctx->Color.ColorMask[0], sizeof(colorMask));
  93
  94    if (mask & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT)) {
  95       intel->front_buffer_dirty = true;
  96    }
  97
  98    if (0)
  99       fprintf(stderr, "%s\n", __func__);
 100
 101    /* Get SW clears out of the way: Anything without an intel_renderbuffer */
 102    for (i = 0; i < BUFFER_COUNT; i++) {
 103       if (!(mask & (1 << i)))
 104          continue;
 105
 106       irb = intel_get_renderbuffer(fb, i);
 107       if (unlikely(!irb)) {
 108          swrast_mask |= (1 << i);
 109          mask &= ~(1 << i);
 110       }
 111    }
 112    if (unlikely(swrast_mask)) {
 113       debug_mask("swrast", swrast_mask);
 114       _swrast_Clear(ctx, swrast_mask);
 115    }
 116
 117    /* HW color buffers (front, back, aux, generic FBO, etc) */
 118    if (colorMask == ~0) {
 119       /* clear all R,G,B,A */
 120       blit_mask |= (mask & BUFFER_BITS_COLOR);
 121    }
 122    else {
 123       /* glColorMask in effect */
 124       tri_mask |= (mask & BUFFER_BITS_COLOR);
 125    }
 126
 127    /* Make sure we have up to date buffers before we start looking at
 128     * the tiling bits to determine how to clear. */
 129    intel_prepare_render(intel);
 130
 131    /* HW stencil */
 132    if (mask & BUFFER_BIT_STENCIL) {
 133       const struct intel_region *stencilRegion
 134          = intel_get_rb_region(fb, BUFFER_STENCIL);
 135       if (stencilRegion) {
 136          /* have hw stencil */
 137          if (stencilRegion->tiling == I915_TILING_Y ||
 138              (ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
 139             /* We have to use the 3D engine if we're clearing a partial mask
 140              * of the stencil buffer, or if we're on a 965 which has a tiled
 141              * depth/stencil buffer in a layout we can't blit to.
 142              */
 143             tri_mask |= BUFFER_BIT_STENCIL;
 144          }
 145          else {
 146             /* clearing all stencil bits, use blitting */
 147             blit_mask |= BUFFER_BIT_STENCIL;
 148          }
 149       }
 150    }
 151
 152    /* HW depth */
 153    if (mask & BUFFER_BIT_DEPTH) {
 154       const struct intel_region *irb = intel_get_rb_region(fb, BUFFER_DEPTH);
 155
 156       /* clear depth with whatever method is used for stencil (see above) */
 157       if (irb->tiling == I915_TILING_Y || tri_mask & BUFFER_BIT_STENCIL)
 158          tri_mask |= BUFFER_BIT_DEPTH;
 159       else
 160          blit_mask |= BUFFER_BIT_DEPTH;
 161    }
 162
 163    /* If we're doing a tri pass for depth/stencil, include a likely color
 164     * buffer with it.
 165     */
 166    if (mask & (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL)) {
 167       int color_bit = ffs(mask & BUFFER_BITS_COLOR);
 168       if (color_bit != 0) {
 169          tri_mask |= blit_mask & (1 << (color_bit - 1));
 170          blit_mask &= ~(1 << (color_bit - 1));
 171       }
 172    }
 173
 174    /* Anything left, just use tris */
 175    tri_mask |= mask & ~blit_mask;
 176
 177    if (blit_mask) {
 178       debug_mask("blit", blit_mask);
 179       tri_mask |= intelClearWithBlit(ctx, blit_mask);
 180    }
 181
 182    if (tri_mask) {
 183       debug_mask("tri", tri_mask);
 184       if (!ctx->Extensions.ARB_fragment_shader)
 185          _mesa_meta_Clear(&intel->ctx, tri_mask);
 186       else
 187          _mesa_meta_glsl_Clear(&intel->ctx, tri_mask);
 188    }
 189 }
 190
 191
 192 void
 193 intelInitClearFuncs(struct dd_function_table *functions)
 194 {
 195    functions->Clear = intelClear;
 196 }