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/*
* Copyright © 2014 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "brw_context.h"
#include "intel_batchbuffer.h"
#include "intel_fbo.h"
#include "main/blit.h"
#include "main/buffers.h"
#include "main/enums.h"
#include "main/fbobject.h"
#include "drivers/common/meta.h"
/**
* @file brw_meta_updownsample.c
*
* Implements upsampling and downsampling of miptrees for window system
* framebuffers.
*/
/**
* Creates a new named renderbuffer that wraps the first slice
* of an existing miptree.
*
* Clobbers the current renderbuffer binding (ctx->CurrentRenderbuffer).
*/
GLuint
brw_get_rb_for_slice(struct brw_context *brw,
struct intel_mipmap_tree *mt,
unsigned level, unsigned layer, bool flat)
{
struct gl_context *ctx = &brw->ctx;
GLuint rbo;
struct gl_renderbuffer *rb;
struct intel_renderbuffer *irb;
/* This turns the GenRenderbuffers name into an actual struct
* intel_renderbuffer.
*/
_mesa_GenRenderbuffers(1, &rbo);
_mesa_BindRenderbuffer(GL_RENDERBUFFER, rbo);
rb = ctx->CurrentRenderbuffer;
irb = intel_renderbuffer(rb);
rb->Format = mt->format;
rb->_BaseFormat = _mesa_get_format_base_format(mt->format);
/* Program takes care of msaa and mip-level access manually for stencil.
* The surface is also treated as Y-tiled instead of as W-tiled calling for
* twice the width and half the height in dimensions.
*/
if (flat) {
const unsigned halign_stencil = 8;
rb->NumSamples = 0;
rb->Width = ALIGN(mt->total_width, halign_stencil) * 2;
rb->Height = (mt->total_height / mt->physical_depth0) / 2;
irb->mt_level = 0;
} else {
rb->NumSamples = mt->num_samples;
rb->Width = mt->logical_width0;
rb->Height = mt->logical_height0;
irb->mt_level = level;
}
irb->mt_layer = layer;
intel_miptree_reference(&irb->mt, mt);
return rbo;
}
/**
* Implementation of up or downsampling for window-system MSAA miptrees.
*/
void
brw_meta_updownsample(struct brw_context *brw,
struct intel_mipmap_tree *src_mt,
struct intel_mipmap_tree *dst_mt)
{
struct gl_context *ctx = &brw->ctx;
GLuint fbos[2], src_rbo, dst_rbo, src_fbo, dst_fbo;
GLenum drawbuffer;
GLbitfield attachment, blit_bit;
if (_mesa_get_format_base_format(src_mt->format) == GL_DEPTH_COMPONENT ||
_mesa_get_format_base_format(src_mt->format) == GL_DEPTH_STENCIL) {
attachment = GL_DEPTH_ATTACHMENT;
drawbuffer = GL_NONE;
blit_bit = GL_DEPTH_BUFFER_BIT;
} else {
attachment = GL_COLOR_ATTACHMENT0;
drawbuffer = GL_COLOR_ATTACHMENT0;
blit_bit = GL_COLOR_BUFFER_BIT;
}
brw_emit_mi_flush(brw);
_mesa_meta_begin(ctx, MESA_META_ALL);
_mesa_GenFramebuffers(2, fbos);
src_rbo = brw_get_rb_for_slice(brw, src_mt, 0, 0, false);
dst_rbo = brw_get_rb_for_slice(brw, dst_mt, 0, 0, false);
src_fbo = fbos[0];
dst_fbo = fbos[1];
_mesa_BindFramebuffer(GL_READ_FRAMEBUFFER, src_fbo);
_mesa_FramebufferRenderbuffer(GL_READ_FRAMEBUFFER, attachment,
GL_RENDERBUFFER, src_rbo);
_mesa_ReadBuffer(drawbuffer);
_mesa_BindFramebuffer(GL_DRAW_FRAMEBUFFER, dst_fbo);
_mesa_FramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, attachment,
GL_RENDERBUFFER, dst_rbo);
_mesa_DrawBuffer(drawbuffer);
_mesa_BlitFramebuffer(0, 0,
src_mt->logical_width0, src_mt->logical_height0,
0, 0,
dst_mt->logical_width0, dst_mt->logical_height0,
blit_bit, GL_NEAREST);
_mesa_DeleteRenderbuffers(1, &src_rbo);
_mesa_DeleteRenderbuffers(1, &dst_rbo);
_mesa_DeleteFramebuffers(2, fbos);
_mesa_meta_end(ctx);
brw_emit_mi_flush(brw);
}
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