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/fbobject.h"
  31
  32 #include "drivers/common/meta.h"
  33
  34 /**
  35  * @file brw_meta_updownsample.c
  36  *
  37  * Implements upsampling and downsampling of miptrees for window system
  38  * framebuffers.
  39  */
  40
  41 /**
  42  * Creates a new named renderbuffer that wraps the first slice
  43  * of an existing miptree.
  44  *
  45  * Clobbers the current renderbuffer binding (ctx->CurrentRenderbuffer).
  46  */
  47 static GLuint
  48 brw_get_rb_for_first_slice(struct brw_context *brw, struct intel_mipmap_tree *mt)
  49 {
  50    struct gl_context *ctx = &brw->ctx;
  51    GLuint rbo;
  52    struct gl_renderbuffer *rb;
  53    struct intel_renderbuffer *irb;
  54
  55    /* This turns the GenRenderbuffers name into an actual struct
  56     * intel_renderbuffer.
  57     */
  58    _mesa_GenRenderbuffers(1, &rbo);
  59    _mesa_BindRenderbuffer(GL_RENDERBUFFER, rbo);
  60
  61    rb = ctx->CurrentRenderbuffer;
  62    irb = intel_renderbuffer(rb);
  63
  64    rb->Format = mt->format;
  65    rb->_BaseFormat = _mesa_base_fbo_format(ctx, mt->format);
  66
  67    rb->NumSamples = mt->num_samples;
  68    rb->Width = mt->logical_width0;
  69    rb->Height = mt->logical_height0;
  70
  71    intel_miptree_reference(&irb->mt, mt);
  72
  73    return rbo;
  74 }
  75
  76 /**
  77  * Implementation of up or downsampling for window-system MSAA miptrees.
  78  */
  79 void
  80 brw_meta_updownsample(struct brw_context *brw,
  81                       struct intel_mipmap_tree *src_mt,
  82                       struct intel_mipmap_tree *dst_mt)
  83 {
  84    struct gl_context *ctx = &brw->ctx;
  85    GLuint fbos[2], src_rbo, dst_rbo, src_fbo, dst_fbo;
  86    GLenum drawbuffer;
  87    GLbitfield attachment, blit_bit;
  88
  89    if (_mesa_get_format_base_format(src_mt->format) == GL_DEPTH_COMPONENT ||
  90        _mesa_get_format_base_format(src_mt->format) == GL_DEPTH_STENCIL) {
  91       attachment = GL_DEPTH_ATTACHMENT;
  92       drawbuffer = GL_NONE;
  93       blit_bit = GL_DEPTH_BUFFER_BIT;
  94    } else {
  95       attachment = GL_COLOR_ATTACHMENT0;
  96       drawbuffer = GL_COLOR_ATTACHMENT0;
  97       blit_bit = GL_COLOR_BUFFER_BIT;
  98    }
  99
 100    intel_batchbuffer_emit_mi_flush(brw);
 101
 102    _mesa_meta_begin(ctx, MESA_META_ALL);
 103    _mesa_GenFramebuffers(2, fbos);
 104    src_rbo = brw_get_rb_for_first_slice(brw, src_mt);
 105    dst_rbo = brw_get_rb_for_first_slice(brw, dst_mt);
 106    src_fbo = fbos[0];
 107    dst_fbo = fbos[1];
 108
 109    _mesa_BindFramebuffer(GL_READ_FRAMEBUFFER, src_fbo);
 110    _mesa_FramebufferRenderbuffer(GL_READ_FRAMEBUFFER, attachment,
 111                                  GL_RENDERBUFFER, src_rbo);
 112    _mesa_ReadBuffer(drawbuffer);
 113
 114    _mesa_BindFramebuffer(GL_DRAW_FRAMEBUFFER, dst_fbo);
 115    _mesa_FramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, attachment,
 116                                  GL_RENDERBUFFER, dst_rbo);
 117    _mesa_DrawBuffer(drawbuffer);
 118
 119    _mesa_BlitFramebuffer(0, 0,
 120                          src_mt->logical_width0, src_mt->logical_height0,
 121                          0, 0,
 122                          dst_mt->logical_width0, dst_mt->logical_height0,
 123                          blit_bit, GL_NEAREST);
 124
 125    _mesa_DeleteRenderbuffers(1, &src_rbo);
 126    _mesa_DeleteRenderbuffers(1, &dst_rbo);
 127    _mesa_DeleteFramebuffers(2, fbos);
 128
 129    _mesa_meta_end(ctx);
 130
 131    intel_batchbuffer_emit_mi_flush(brw);
 132 }