554 lines
18 KiB
C++
554 lines
18 KiB
C++
/*
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* This program source code file is part of KICAD, a free EDA CAD application.
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*
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* Copyright (C) 2016-2021 Kicad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <gal/opengl/antialiasing.h>
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#include <gal/opengl/opengl_compositor.h>
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#include <gal/opengl/utils.h>
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#include <gal/color4d.h>
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#include <memory>
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#include <tuple>
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#include <glsl_smaa_base.h>
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#include <glsl_smaa_pass_1_frag_color.h>
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#include <glsl_smaa_pass_1_frag_luma.h>
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#include <glsl_smaa_pass_1_vert.h>
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#include <glsl_smaa_pass_2_frag.h>
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#include <glsl_smaa_pass_2_vert.h>
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#include <glsl_smaa_pass_3_frag.h>
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#include <glsl_smaa_pass_3_vert.h>
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#include "SmaaAreaTex.h"
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#include "SmaaSearchTex.h"
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using namespace KIGFX;
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// =========================
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// ANTIALIASING_NONE
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// =========================
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ANTIALIASING_NONE::ANTIALIASING_NONE( OPENGL_COMPOSITOR* aCompositor ) :
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compositor( aCompositor )
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{
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}
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bool ANTIALIASING_NONE::Init()
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{
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// Nothing to initialize
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return true;
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}
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VECTOR2I ANTIALIASING_NONE::GetInternalBufferSize()
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{
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return compositor->GetScreenSize();
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}
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void ANTIALIASING_NONE::DrawBuffer( GLuint buffer )
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{
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compositor->DrawBuffer( buffer, OPENGL_COMPOSITOR::DIRECT_RENDERING );
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}
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void ANTIALIASING_NONE::Present()
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{
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// Nothing to present, draw_buffer already drew to the screen
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}
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void ANTIALIASING_NONE::OnLostBuffers()
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{
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// Nothing to do
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}
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void ANTIALIASING_NONE::Begin()
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{
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// Nothing to do
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}
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unsigned int ANTIALIASING_NONE::CreateBuffer()
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{
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return compositor->CreateBuffer( compositor->GetScreenSize() );
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}
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namespace
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{
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void draw_fullscreen_primitive()
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{
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glMatrixMode( GL_MODELVIEW );
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glPushMatrix();
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glLoadIdentity();
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glMatrixMode( GL_PROJECTION );
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glPushMatrix();
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glLoadIdentity();
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glBegin( GL_TRIANGLES );
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glTexCoord2f( 0.0f, 1.0f );
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glVertex2f( -1.0f, 1.0f );
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glTexCoord2f( 0.0f, 0.0f );
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glVertex2f( -1.0f, -1.0f );
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glTexCoord2f( 1.0f, 1.0f );
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glVertex2f( 1.0f, 1.0f );
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glTexCoord2f( 1.0f, 1.0f );
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glVertex2f( 1.0f, 1.0f );
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glTexCoord2f( 0.0f, 0.0f );
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glVertex2f( -1.0f, -1.0f );
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glTexCoord2f( 1.0f, 0.0f );
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glVertex2f( 1.0f, -1.0f );
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glEnd();
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glPopMatrix();
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glMatrixMode( GL_MODELVIEW );
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glPopMatrix();
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}
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} // namespace
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// =========================
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// ANTIALIASING_SUPERSAMPLING
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// =========================
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ANTIALIASING_SUPERSAMPLING::ANTIALIASING_SUPERSAMPLING( OPENGL_COMPOSITOR* aCompositor ) :
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compositor( aCompositor ),
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ssaaMainBuffer( 0 ), areBuffersCreated( false ), areShadersCreated( false )
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{
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}
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bool ANTIALIASING_SUPERSAMPLING::Init()
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{
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areShadersCreated = false;
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if( !areBuffersCreated )
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{
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ssaaMainBuffer = compositor->CreateBuffer();
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
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areBuffersCreated = true;
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}
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return true;
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}
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VECTOR2I ANTIALIASING_SUPERSAMPLING::GetInternalBufferSize()
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{
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return compositor->GetScreenSize() * 2;
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}
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void ANTIALIASING_SUPERSAMPLING::Begin()
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{
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compositor->SetBuffer( ssaaMainBuffer );
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compositor->ClearBuffer( COLOR4D::BLACK );
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}
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void ANTIALIASING_SUPERSAMPLING::DrawBuffer( GLuint aBuffer )
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{
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compositor->DrawBuffer( aBuffer, ssaaMainBuffer );
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}
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void ANTIALIASING_SUPERSAMPLING::Present()
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{
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glDisable( GL_BLEND );
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glDisable( GL_DEPTH_TEST );
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glActiveTexture( GL_TEXTURE0 );
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glBindTexture( GL_TEXTURE_2D, compositor->GetBufferTexture( ssaaMainBuffer ) );
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compositor->SetBuffer( OPENGL_COMPOSITOR::DIRECT_RENDERING );
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draw_fullscreen_primitive();
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}
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void ANTIALIASING_SUPERSAMPLING::OnLostBuffers()
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{
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areBuffersCreated = false;
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}
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unsigned int ANTIALIASING_SUPERSAMPLING::CreateBuffer()
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{
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return compositor->CreateBuffer( GetInternalBufferSize() );
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}
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// ===============================
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// ANTIALIASING_SMAA
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// ===============================
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ANTIALIASING_SMAA::ANTIALIASING_SMAA( OPENGL_COMPOSITOR* aCompositor ) :
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areBuffersInitialized( false ),
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shadersLoaded( false ),
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compositor( aCompositor )
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{
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smaaBaseBuffer = 0;
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smaaEdgesBuffer = 0;
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smaaBlendBuffer = 0;
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smaaAreaTex = 0;
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smaaSearchTex = 0;
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pass_1_metrics = 0;
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pass_2_metrics = 0;
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pass_3_metrics = 0;
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}
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VECTOR2I ANTIALIASING_SMAA::GetInternalBufferSize()
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{
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return compositor->GetScreenSize();
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}
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void ANTIALIASING_SMAA::loadShaders()
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{
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// Load constant textures
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glEnable( GL_TEXTURE_2D );
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glActiveTexture( GL_TEXTURE0 );
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glGenTextures( 1, &smaaAreaTex );
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glBindTexture( GL_TEXTURE_2D, smaaAreaTex );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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glTexImage2D( GL_TEXTURE_2D, 0, GL_RG8, AREATEX_WIDTH, AREATEX_HEIGHT, 0, GL_RG,
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GL_UNSIGNED_BYTE, areaTexBytes );
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checkGlError( "loading smaa area tex", __FILE__, __LINE__ );
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glGenTextures( 1, &smaaSearchTex );
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glBindTexture( GL_TEXTURE_2D, smaaSearchTex );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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glTexImage2D( GL_TEXTURE_2D, 0, GL_R8, SEARCHTEX_WIDTH, SEARCHTEX_HEIGHT, 0, GL_RED,
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GL_UNSIGNED_BYTE, searchTexBytes );
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checkGlError( "loading smaa search tex", __FILE__, __LINE__ );
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// Quality settings:
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// THRESHOLD: intended to exclude spurious edges in photorealistic game graphics
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// but in a high-contrast CAD application, all edges are intentional
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// should be set fairly low, so user color choices do not affect antialiasing
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// MAX_SEARCH_STEPS: steps of 2px, searched in H/V direction to discover true angle of edges
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// improves AA for lines close H/V but creates fuzzyness at junctions
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// MAX_SEARCH_STEPS_DIAG: steps of 1px, searched in diagonal direction
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// improves lines close to 45deg but turns small circles into octagons
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// CORNER_ROUNDING: SMAA can distinguish actual corners from aliasing jaggies,
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// we want to preserve those as much as possible
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// Edge Detection: In Eeschema, when a single pixel line changes color, edge detection using
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// color is too aggressive and leads to a white spot at the transition point
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std::string quality_string;
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std::string edge_detect_shader;
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// trades imperfect AA of shallow angles for a near artifact-free reproduction of fine features
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// jaggies are smoothed over max 5px (original step + 2px in both directions)
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quality_string = "#define SMAA_THRESHOLD 0.005\n"
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"#define SMAA_MAX_SEARCH_STEPS 1\n"
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"#define SMAA_MAX_SEARCH_STEPS_DIAG 2\n"
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"#define SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR 1.5\n"
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"#define SMAA_CORNER_ROUNDING 0\n";
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edge_detect_shader = BUILTIN_SHADERS::glsl_smaa_pass_1_frag_luma;
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// set up shaders
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std::string vert_preamble( R"SHADER(
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#version 120
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#define SMAA_GLSL_2_1
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#define SMAA_INCLUDE_VS 1
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#define SMAA_INCLUDE_PS 0
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uniform vec4 SMAA_RT_METRICS;
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)SHADER" );
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std::string frag_preamble( R"SHADER(
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#version 120
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#define SMAA_GLSL_2_1
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#define SMAA_INCLUDE_VS 0
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#define SMAA_INCLUDE_PS 1
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uniform vec4 SMAA_RT_METRICS;
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)SHADER" );
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//
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// Set up pass 1 Shader
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//
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pass_1_shader = std::make_unique<SHADER>();
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pass_1_shader->LoadShaderFromStrings( KIGFX::SHADER_TYPE_VERTEX, vert_preamble, quality_string,
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BUILTIN_SHADERS::glsl_smaa_base,
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BUILTIN_SHADERS::glsl_smaa_pass_1_vert );
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pass_1_shader->LoadShaderFromStrings( KIGFX::SHADER_TYPE_FRAGMENT, frag_preamble,
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quality_string, BUILTIN_SHADERS::glsl_smaa_base, edge_detect_shader );
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pass_1_shader->Link();
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checkGlError( "linking pass 1 shader", __FILE__, __LINE__ );
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GLint smaaColorTexParameter = pass_1_shader->AddParameter( "colorTex" );
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checkGlError( "pass1: getting colorTex uniform", __FILE__, __LINE__ );
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pass_1_metrics = pass_1_shader->AddParameter( "SMAA_RT_METRICS" );
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checkGlError( "pass1: getting metrics uniform", __FILE__, __LINE__ );
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pass_1_shader->Use();
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checkGlError( "pass1: using shader", __FILE__, __LINE__ );
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pass_1_shader->SetParameter( smaaColorTexParameter, 0 );
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checkGlError( "pass1: setting colorTex uniform", __FILE__, __LINE__ );
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pass_1_shader->Deactivate();
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checkGlError( "pass1: deactivating shader", __FILE__, __LINE__ );
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//
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// set up pass 2 shader
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//
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pass_2_shader = std::make_unique<SHADER>();
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pass_2_shader->LoadShaderFromStrings( KIGFX::SHADER_TYPE_VERTEX, vert_preamble, quality_string,
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BUILTIN_SHADERS::glsl_smaa_base,
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BUILTIN_SHADERS::glsl_smaa_pass_2_vert );
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pass_2_shader->LoadShaderFromStrings( KIGFX::SHADER_TYPE_FRAGMENT, frag_preamble,
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quality_string, BUILTIN_SHADERS::glsl_smaa_base,
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BUILTIN_SHADERS::glsl_smaa_pass_2_frag );
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pass_2_shader->Link();
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checkGlError( "linking pass 2 shader", __FILE__, __LINE__ );
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GLint smaaEdgesTexParameter = pass_2_shader->AddParameter( "edgesTex" );
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checkGlError( "pass2: getting colorTex uniform", __FILE__, __LINE__ );
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GLint smaaAreaTexParameter = pass_2_shader->AddParameter( "areaTex" );
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checkGlError( "pass2: getting areaTex uniform", __FILE__, __LINE__ );
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GLint smaaSearchTexParameter = pass_2_shader->AddParameter( "searchTex" );
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checkGlError( "pass2: getting searchTex uniform", __FILE__, __LINE__ );
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pass_2_metrics = pass_2_shader->AddParameter( "SMAA_RT_METRICS" );
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checkGlError( "pass2: getting metrics uniform", __FILE__, __LINE__ );
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pass_2_shader->Use();
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checkGlError( "pass2: using shader", __FILE__, __LINE__ );
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pass_2_shader->SetParameter( smaaEdgesTexParameter, 0 );
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checkGlError( "pass2: setting colorTex uniform", __FILE__, __LINE__ );
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pass_2_shader->SetParameter( smaaAreaTexParameter, 1 );
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checkGlError( "pass2: setting areaTex uniform", __FILE__, __LINE__ );
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pass_2_shader->SetParameter( smaaSearchTexParameter, 3 );
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checkGlError( "pass2: setting searchTex uniform", __FILE__, __LINE__ );
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pass_2_shader->Deactivate();
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checkGlError( "pass2: deactivating shader", __FILE__, __LINE__ );
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//
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// set up pass 3 shader
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//
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pass_3_shader = std::make_unique<SHADER>();
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pass_3_shader->LoadShaderFromStrings( KIGFX::SHADER_TYPE_VERTEX, vert_preamble, quality_string,
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BUILTIN_SHADERS::glsl_smaa_base,
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BUILTIN_SHADERS::glsl_smaa_pass_3_vert );
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pass_3_shader->LoadShaderFromStrings( KIGFX::SHADER_TYPE_FRAGMENT, frag_preamble,
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quality_string, BUILTIN_SHADERS::glsl_smaa_base,
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BUILTIN_SHADERS::glsl_smaa_pass_3_frag );
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pass_3_shader->Link();
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GLint smaaP3ColorTexParameter = pass_3_shader->AddParameter( "colorTex" );
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checkGlError( "pass3: getting colorTex uniform", __FILE__, __LINE__ );
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GLint smaaBlendTexParameter = pass_3_shader->AddParameter( "blendTex" );
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checkGlError( "pass3: getting blendTex uniform", __FILE__, __LINE__ );
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pass_3_metrics = pass_3_shader->AddParameter( "SMAA_RT_METRICS" );
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checkGlError( "pass3: getting metrics uniform", __FILE__, __LINE__ );
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pass_3_shader->Use();
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checkGlError( "pass3: using shader", __FILE__, __LINE__ );
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pass_3_shader->SetParameter( smaaP3ColorTexParameter, 0 );
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checkGlError( "pass3: setting colorTex uniform", __FILE__, __LINE__ );
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pass_3_shader->SetParameter( smaaBlendTexParameter, 1 );
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checkGlError( "pass3: setting blendTex uniform", __FILE__, __LINE__ );
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pass_3_shader->Deactivate();
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checkGlError( "pass3: deactivating shader", __FILE__, __LINE__ );
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shadersLoaded = true;
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}
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void ANTIALIASING_SMAA::updateUniforms()
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{
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auto dims = compositor->GetScreenSize();
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pass_1_shader->Use();
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checkGlError( "pass1: using shader", __FILE__, __LINE__ );
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pass_1_shader->SetParameter( pass_1_metrics, 1.f / float( dims.x ), 1.f / float( dims.y ),
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float( dims.x ), float( dims.y ) );
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checkGlError( "pass1: setting metrics uniform", __FILE__, __LINE__ );
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pass_1_shader->Deactivate();
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checkGlError( "pass1: deactivating shader", __FILE__, __LINE__ );
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pass_2_shader->Use();
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checkGlError( "pass2: using shader", __FILE__, __LINE__ );
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pass_2_shader->SetParameter( pass_2_metrics, 1.f / float( dims.x ), 1.f / float( dims.y ),
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float( dims.x ), float( dims.y ) );
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checkGlError( "pass2: setting metrics uniform", __FILE__, __LINE__ );
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pass_2_shader->Deactivate();
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checkGlError( "pass2: deactivating shader", __FILE__, __LINE__ );
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pass_3_shader->Use();
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checkGlError( "pass3: using shader", __FILE__, __LINE__ );
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pass_3_shader->SetParameter( pass_3_metrics, 1.f / float( dims.x ), 1.f / float( dims.y ),
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float( dims.x ), float( dims.y ) );
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checkGlError( "pass3: setting metrics uniform", __FILE__, __LINE__ );
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pass_3_shader->Deactivate();
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checkGlError( "pass3: deactivating shader", __FILE__, __LINE__ );
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}
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bool ANTIALIASING_SMAA::Init()
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{
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if( !shadersLoaded )
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loadShaders();
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if( !areBuffersInitialized )
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{
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smaaBaseBuffer = compositor->CreateBuffer();
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
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smaaEdgesBuffer = compositor->CreateBuffer();
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
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smaaBlendBuffer = compositor->CreateBuffer();
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
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glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
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updateUniforms();
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areBuffersInitialized = true;
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}
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// Nothing to initialize
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return true;
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}
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void ANTIALIASING_SMAA::OnLostBuffers()
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{
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areBuffersInitialized = false;
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}
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unsigned int ANTIALIASING_SMAA::CreateBuffer()
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{
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return compositor->CreateBuffer( compositor->GetScreenSize() );
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}
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void ANTIALIASING_SMAA::DrawBuffer( GLuint buffer )
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{
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// draw to internal buffer
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compositor->DrawBuffer( buffer, smaaBaseBuffer );
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}
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void ANTIALIASING_SMAA::Begin()
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{
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compositor->SetBuffer( smaaBaseBuffer );
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compositor->ClearBuffer( COLOR4D::BLACK );
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}
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namespace
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{
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void draw_fullscreen_triangle()
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{
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glMatrixMode( GL_MODELVIEW );
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glPushMatrix();
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glLoadIdentity();
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glMatrixMode( GL_PROJECTION );
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glPushMatrix();
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glLoadIdentity();
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glBegin( GL_TRIANGLES );
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glTexCoord2f( 0.0f, 1.0f );
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glVertex2f( -1.0f, 1.0f );
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glTexCoord2f( 0.0f, -1.0f );
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glVertex2f( -1.0f, -3.0f );
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glTexCoord2f( 2.0f, 1.0f );
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glVertex2f( 3.0f, 1.0f );
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glEnd();
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glPopMatrix();
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glMatrixMode( GL_MODELVIEW );
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glPopMatrix();
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}
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} // namespace
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void ANTIALIASING_SMAA::Present()
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{
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auto sourceTexture = compositor->GetBufferTexture( smaaBaseBuffer );
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|
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glDisable( GL_BLEND );
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glDisable( GL_DEPTH_TEST );
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glEnable( GL_TEXTURE_2D );
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|
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//
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|
// pass 1: main-buffer -> smaaEdgesBuffer
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//
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|
compositor->SetBuffer( smaaEdgesBuffer );
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compositor->ClearBuffer( COLOR4D::BLACK );
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|
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glActiveTexture( GL_TEXTURE0 );
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glBindTexture( GL_TEXTURE_2D, sourceTexture );
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checkGlError( "binding colorTex", __FILE__, __LINE__ );
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pass_1_shader->Use();
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|
checkGlError( "using smaa pass 1 shader", __FILE__, __LINE__ );
|
|
draw_fullscreen_triangle();
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|
pass_1_shader->Deactivate();
|
|
|
|
//
|
|
// pass 2: smaaEdgesBuffer -> smaaBlendBuffer
|
|
//
|
|
compositor->SetBuffer( smaaBlendBuffer );
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|
compositor->ClearBuffer( COLOR4D::BLACK );
|
|
|
|
auto edgesTex = compositor->GetBufferTexture( smaaEdgesBuffer );
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|
|
|
glActiveTexture( GL_TEXTURE0 );
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glBindTexture( GL_TEXTURE_2D, edgesTex );
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|
glActiveTexture( GL_TEXTURE1 );
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glBindTexture( GL_TEXTURE_2D, smaaAreaTex );
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glActiveTexture( GL_TEXTURE3 );
|
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glBindTexture( GL_TEXTURE_2D, smaaSearchTex );
|
|
|
|
pass_2_shader->Use();
|
|
draw_fullscreen_triangle();
|
|
pass_2_shader->Deactivate();
|
|
|
|
//
|
|
// pass 3: colorTex + BlendBuffer -> output
|
|
//
|
|
compositor->SetBuffer( OPENGL_COMPOSITOR::DIRECT_RENDERING );
|
|
compositor->ClearBuffer( COLOR4D::BLACK );
|
|
auto blendTex = compositor->GetBufferTexture( smaaBlendBuffer );
|
|
|
|
glActiveTexture( GL_TEXTURE0 );
|
|
glBindTexture( GL_TEXTURE_2D, sourceTexture );
|
|
glActiveTexture( GL_TEXTURE1 );
|
|
glBindTexture( GL_TEXTURE_2D, blendTex );
|
|
|
|
pass_3_shader->Use();
|
|
draw_fullscreen_triangle();
|
|
pass_3_shader->Deactivate();
|
|
}
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