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

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "brw_context.h"
  25 #include "intel_batchbuffer.h"
  26 #include "intel_fbo.h"
  27
  28 #include "main/blit.h"
  29 #include "main/buffers.h"
  30 #include "main/enums.h"
  31 #include "main/fbobject.h"
  32
  33 #include "drivers/common/meta.h"
  34
  35 /**
  36  * @file brw_meta_updownsample.c
  37  *
  38  * Implements upsampling and downsampling of miptrees for window system
  39  * framebuffers.
  40  */
  41
  42 /**
  43  * Creates a new named renderbuffer that wraps the first slice
  44  * of an existing miptree.
  45  *
  46  * Clobbers the current renderbuffer binding (ctx->CurrentRenderbuffer).
  47  */
  48 GLuint
  49 brw_get_rb_for_slice(struct brw_context *brw,
  50                      struct intel_mipmap_tree *mt,
  51                      unsigned level, unsigned layer, bool flat)
  52 {
  53    struct gl_context *ctx = &brw->ctx;
  54    GLuint rbo;
  55    struct gl_renderbuffer *rb;
  56    struct intel_renderbuffer *irb;
  57
  58    /* This turns the GenRenderbuffers name into an actual struct
  59     * intel_renderbuffer.
  60     */
  61    _mesa_GenRenderbuffers(1, &rbo);
  62    _mesa_BindRenderbuffer(GL_RENDERBUFFER, rbo);
  63
  64    rb = ctx->CurrentRenderbuffer;
  65    irb = intel_renderbuffer(rb);
  66
  67    rb->Format = mt->format;
  68    rb->_BaseFormat = _mesa_get_format_base_format(mt->format);
  69
  70    /* Program takes care of msaa and mip-level access manually for stencil.
  71     * The surface is also treated as Y-tiled instead of as W-tiled calling for
  72     * twice the width and half the height in dimensions.
  73     */
  74    if (flat) {
  75       const unsigned halign_stencil = 8;
  76
  77       rb->NumSamples = 0;
  78       rb->Width = ALIGN(mt->total_width, halign_stencil) * 2;
  79       rb->Height = (mt->total_height / mt->physical_depth0) / 2;
  80       irb->mt_level = 0;
  81    } else {
  82       rb->NumSamples = mt->num_samples;
  83       rb->Width = mt->logical_width0;
  84       rb->Height = mt->logical_height0;
  85       irb->mt_level = level;
  86    }
  87
  88    irb->mt_layer = layer;
  89
  90    intel_miptree_reference(&irb->mt, mt);
  91
  92    return rbo;
  93 }
  94
  95 /**
  96  * Implementation of up or downsampling for window-system MSAA miptrees.
  97  */
  98 void
  99 brw_meta_updownsample(struct brw_context *brw,
 100                       struct intel_mipmap_tree *src_mt,
 101                       struct intel_mipmap_tree *dst_mt)
 102 {
 103    struct gl_context *ctx = &brw->ctx;
 104    GLuint fbos[2], src_rbo, dst_rbo, src_fbo, dst_fbo;
 105    GLenum drawbuffer;
 106    GLbitfield attachment, blit_bit;
 107
 108    if (_mesa_get_format_base_format(src_mt->format) == GL_DEPTH_COMPONENT ||
 109        _mesa_get_format_base_format(src_mt->format) == GL_DEPTH_STENCIL) {
 110       attachment = GL_DEPTH_ATTACHMENT;
 111       drawbuffer = GL_NONE;
 112       blit_bit = GL_DEPTH_BUFFER_BIT;
 113    } else {
 114       attachment = GL_COLOR_ATTACHMENT0;
 115       drawbuffer = GL_COLOR_ATTACHMENT0;
 116       blit_bit = GL_COLOR_BUFFER_BIT;
 117    }
 118
 119    brw_emit_mi_flush(brw);
 120
 121    _mesa_meta_begin(ctx, MESA_META_ALL);
 122    _mesa_GenFramebuffers(2, fbos);
 123    src_rbo = brw_get_rb_for_slice(brw, src_mt, 0, 0, false);
 124    dst_rbo = brw_get_rb_for_slice(brw, dst_mt, 0, 0, false);
 125    src_fbo = fbos[0];
 126    dst_fbo = fbos[1];
 127
 128    _mesa_BindFramebuffer(GL_READ_FRAMEBUFFER, src_fbo);
 129    _mesa_FramebufferRenderbuffer(GL_READ_FRAMEBUFFER, attachment,
 130                                  GL_RENDERBUFFER, src_rbo);
 131    _mesa_ReadBuffer(drawbuffer);
 132
 133    _mesa_BindFramebuffer(GL_DRAW_FRAMEBUFFER, dst_fbo);
 134    _mesa_FramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, attachment,
 135                                  GL_RENDERBUFFER, dst_rbo);
 136    _mesa_DrawBuffer(drawbuffer);
 137
 138    _mesa_BlitFramebuffer(0, 0,
 139                          src_mt->logical_width0, src_mt->logical_height0,
 140                          0, 0,
 141                          dst_mt->logical_width0, dst_mt->logical_height0,
 142                          blit_bit, GL_NEAREST);
 143
 144    _mesa_DeleteRenderbuffers(1, &src_rbo);
 145    _mesa_DeleteRenderbuffers(1, &dst_rbo);
 146    _mesa_DeleteFramebuffers(2, fbos);
 147
 148    _mesa_meta_end(ctx);
 149
 150    brw_emit_mi_flush(brw);
 151 }