mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-12-02 17:02:17 +00:00
277964f074
- Implemented soft shadows using PCF hardware shadow mapping The implementation uses sampler2DArrayShadow and PCF which usually requires Direct3D 10.1 however it is in the OpenGL 3.2 core so it should be widely supported. All 3 light types are supported which means parallel lights (sun) use scene independent cascaded shadow mapping. The implementation is very fast with single taps (400 fps average per scene on a GTX 660 ti OC) however I defaulted it to 16 taps so the shadows look really good which should you give stable 100 fps on todays hardware. The shadow filtering algorithm is based on Carmack's research which was released in the original Doom 3 GPL release draw_exp.cpp. - Changed interaction shaders to use Half-Lambert lighting like in HL2 to make the game less dark - Fixed some of the renderer debugging/development tools like r_showTris
708 lines
15 KiB
C++
708 lines
15 KiB
C++
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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Copyright (C) 2013-2014 Robert Beckebans
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code 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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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#pragma hdrstop
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#include "precompiled.h"
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#include "../tr_local.h"
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/*
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====================
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GL_SelectTexture
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====================
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*/
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void GL_SelectTexture( int unit )
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{
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if( backEnd.glState.currenttmu == unit )
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{
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return;
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}
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if( unit < 0 || unit >= glConfig.maxTextureImageUnits )
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{
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common->Warning( "GL_SelectTexture: unit = %i", unit );
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return;
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}
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RENDERLOG_PRINTF( "GL_SelectTexture( %i );\n", unit );
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backEnd.glState.currenttmu = unit;
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}
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/*
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====================
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GL_Cull
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This handles the flipping needed when the view being
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rendered is a mirored view.
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====================
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*/
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void GL_Cull( int cullType )
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{
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if( backEnd.glState.faceCulling == cullType )
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{
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return;
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}
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if( cullType == CT_TWO_SIDED )
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{
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glDisable( GL_CULL_FACE );
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}
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else
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{
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if( backEnd.glState.faceCulling == CT_TWO_SIDED )
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{
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glEnable( GL_CULL_FACE );
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}
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if( cullType == CT_BACK_SIDED )
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{
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if( backEnd.viewDef->isMirror )
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{
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glCullFace( GL_FRONT );
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}
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else
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{
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glCullFace( GL_BACK );
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}
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}
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else
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{
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if( backEnd.viewDef->isMirror )
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{
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glCullFace( GL_BACK );
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}
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else
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{
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glCullFace( GL_FRONT );
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}
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}
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}
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backEnd.glState.faceCulling = cullType;
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}
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/*
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====================
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GL_Scissor
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====================
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*/
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void GL_Scissor( int x /* left*/, int y /* bottom */, int w, int h )
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{
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glScissor( x, y, w, h );
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}
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/*
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====================
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GL_Viewport
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====================
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*/
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void GL_Viewport( int x /* left */, int y /* bottom */, int w, int h )
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{
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glViewport( x, y, w, h );
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}
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/*
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====================
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GL_PolygonOffset
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====================
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*/
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void GL_PolygonOffset( float scale, float bias )
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{
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backEnd.glState.polyOfsScale = scale;
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backEnd.glState.polyOfsBias = bias;
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if( backEnd.glState.glStateBits & GLS_POLYGON_OFFSET )
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{
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glPolygonOffset( scale, bias );
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}
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}
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/*
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========================
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GL_DepthBoundsTest
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========================
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*/
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void GL_DepthBoundsTest( const float zmin, const float zmax )
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{
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if( !glConfig.depthBoundsTestAvailable || zmin > zmax )
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{
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return;
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}
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if( zmin == 0.0f && zmax == 0.0f )
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{
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glDisable( GL_DEPTH_BOUNDS_TEST_EXT );
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}
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else
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{
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glEnable( GL_DEPTH_BOUNDS_TEST_EXT );
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glDepthBoundsEXT( zmin, zmax );
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}
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}
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/*
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========================
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GL_StartDepthPass
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========================
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*/
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void GL_StartDepthPass( const idScreenRect& rect )
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{
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}
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/*
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========================
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GL_FinishDepthPass
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========================
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*/
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void GL_FinishDepthPass()
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{
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}
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/*
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========================
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GL_GetDepthPassRect
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========================
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*/
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void GL_GetDepthPassRect( idScreenRect& rect )
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{
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rect.Clear();
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}
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/*
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====================
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GL_Color
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====================
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*/
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/*
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void GL_Color( float* color )
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{
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if( color == NULL )
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{
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return;
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}
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GL_Color( color[0], color[1], color[2], color[3] );
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}
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*/
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// RB begin
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void GL_Color( const idVec3& color )
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{
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GL_Color( color[0], color[1], color[2], 1.0f );
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}
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void GL_Color( const idVec4& color )
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{
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GL_Color( color[0], color[1], color[2], color[3] );
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}
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// RB end
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/*
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====================
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GL_Color
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====================
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*/
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void GL_Color( float r, float g, float b )
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{
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GL_Color( r, g, b, 1.0f );
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}
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/*
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====================
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GL_Color
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====================
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*/
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void GL_Color( float r, float g, float b, float a )
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{
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float parm[4];
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parm[0] = idMath::ClampFloat( 0.0f, 1.0f, r );
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parm[1] = idMath::ClampFloat( 0.0f, 1.0f, g );
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parm[2] = idMath::ClampFloat( 0.0f, 1.0f, b );
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parm[3] = idMath::ClampFloat( 0.0f, 1.0f, a );
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renderProgManager.SetRenderParm( RENDERPARM_COLOR, parm );
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}
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/*
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========================
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GL_Clear
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========================
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*/
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void GL_Clear( bool color, bool depth, bool stencil, byte stencilValue, float r, float g, float b, float a )
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{
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int clearFlags = 0;
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if( color )
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{
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glClearColor( r, g, b, a );
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clearFlags |= GL_COLOR_BUFFER_BIT;
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}
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if( depth )
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{
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clearFlags |= GL_DEPTH_BUFFER_BIT;
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}
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if( stencil )
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{
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glClearStencil( stencilValue );
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clearFlags |= GL_STENCIL_BUFFER_BIT;
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}
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glClear( clearFlags );
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}
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/*
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========================
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GL_SetDefaultState
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This should initialize all GL state that any part of the entire program
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may touch, including the editor.
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========================
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*/
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void GL_SetDefaultState()
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{
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RENDERLOG_PRINTF( "--- GL_SetDefaultState ---\n" );
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glClearDepth( 1.0f );
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// make sure our GL state vector is set correctly
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memset( &backEnd.glState, 0, sizeof( backEnd.glState ) );
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GL_State( 0, true );
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// RB begin
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Framebuffer::BindNull();
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// RB end
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// These are changed by GL_Cull
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glCullFace( GL_FRONT_AND_BACK );
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glEnable( GL_CULL_FACE );
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// These are changed by GL_State
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glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
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glBlendFunc( GL_ONE, GL_ZERO );
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glDepthMask( GL_TRUE );
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glDepthFunc( GL_LESS );
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glDisable( GL_STENCIL_TEST );
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glDisable( GL_POLYGON_OFFSET_FILL );
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glDisable( GL_POLYGON_OFFSET_LINE );
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glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
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// These should never be changed
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// DG: deprecated in opengl 3.2 and not needed because we don't do fixed function pipeline
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// glShadeModel( GL_SMOOTH );
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// DG end
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glEnable( GL_DEPTH_TEST );
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glEnable( GL_BLEND );
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glEnable( GL_SCISSOR_TEST );
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glDrawBuffer( GL_BACK );
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glReadBuffer( GL_BACK );
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if( r_useScissor.GetBool() )
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{
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glScissor( 0, 0, renderSystem->GetWidth(), renderSystem->GetHeight() );
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}
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}
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/*
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====================
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GL_State
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This routine is responsible for setting the most commonly changed state
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====================
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*/
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void GL_State( uint64 stateBits, bool forceGlState )
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{
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uint64 diff = stateBits ^ backEnd.glState.glStateBits;
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if( !r_useStateCaching.GetBool() || forceGlState )
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{
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// make sure everything is set all the time, so we
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// can see if our delta checking is screwing up
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diff = 0xFFFFFFFFFFFFFFFF;
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}
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else if( diff == 0 )
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{
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return;
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}
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//
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// check depthFunc bits
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//
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if( diff & GLS_DEPTHFUNC_BITS )
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{
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switch( stateBits & GLS_DEPTHFUNC_BITS )
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{
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case GLS_DEPTHFUNC_EQUAL:
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glDepthFunc( GL_EQUAL );
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break;
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case GLS_DEPTHFUNC_ALWAYS:
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glDepthFunc( GL_ALWAYS );
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break;
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case GLS_DEPTHFUNC_LESS:
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glDepthFunc( GL_LEQUAL );
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break;
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case GLS_DEPTHFUNC_GREATER:
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glDepthFunc( GL_GEQUAL );
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break;
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}
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}
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//
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// check blend bits
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//
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if( diff & ( GLS_SRCBLEND_BITS | GLS_DSTBLEND_BITS ) )
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{
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GLenum srcFactor = GL_ONE;
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GLenum dstFactor = GL_ZERO;
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switch( stateBits & GLS_SRCBLEND_BITS )
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{
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case GLS_SRCBLEND_ZERO:
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srcFactor = GL_ZERO;
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break;
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case GLS_SRCBLEND_ONE:
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srcFactor = GL_ONE;
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break;
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case GLS_SRCBLEND_DST_COLOR:
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srcFactor = GL_DST_COLOR;
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break;
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case GLS_SRCBLEND_ONE_MINUS_DST_COLOR:
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srcFactor = GL_ONE_MINUS_DST_COLOR;
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break;
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case GLS_SRCBLEND_SRC_ALPHA:
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srcFactor = GL_SRC_ALPHA;
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break;
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case GLS_SRCBLEND_ONE_MINUS_SRC_ALPHA:
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srcFactor = GL_ONE_MINUS_SRC_ALPHA;
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break;
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case GLS_SRCBLEND_DST_ALPHA:
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srcFactor = GL_DST_ALPHA;
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break;
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case GLS_SRCBLEND_ONE_MINUS_DST_ALPHA:
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srcFactor = GL_ONE_MINUS_DST_ALPHA;
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break;
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default:
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assert( !"GL_State: invalid src blend state bits\n" );
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break;
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}
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switch( stateBits & GLS_DSTBLEND_BITS )
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{
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case GLS_DSTBLEND_ZERO:
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dstFactor = GL_ZERO;
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break;
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case GLS_DSTBLEND_ONE:
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dstFactor = GL_ONE;
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break;
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case GLS_DSTBLEND_SRC_COLOR:
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dstFactor = GL_SRC_COLOR;
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break;
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case GLS_DSTBLEND_ONE_MINUS_SRC_COLOR:
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dstFactor = GL_ONE_MINUS_SRC_COLOR;
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break;
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case GLS_DSTBLEND_SRC_ALPHA:
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dstFactor = GL_SRC_ALPHA;
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break;
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case GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA:
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dstFactor = GL_ONE_MINUS_SRC_ALPHA;
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break;
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case GLS_DSTBLEND_DST_ALPHA:
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dstFactor = GL_DST_ALPHA;
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break;
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case GLS_DSTBLEND_ONE_MINUS_DST_ALPHA:
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dstFactor = GL_ONE_MINUS_DST_ALPHA;
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break;
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default:
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assert( !"GL_State: invalid dst blend state bits\n" );
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break;
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}
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// Only actually update GL's blend func if blending is enabled.
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if( srcFactor == GL_ONE && dstFactor == GL_ZERO )
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{
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glDisable( GL_BLEND );
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}
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else
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{
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glEnable( GL_BLEND );
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glBlendFunc( srcFactor, dstFactor );
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}
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}
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//
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// check depthmask
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//
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if( diff & GLS_DEPTHMASK )
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{
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if( stateBits & GLS_DEPTHMASK )
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{
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glDepthMask( GL_FALSE );
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}
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else
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{
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glDepthMask( GL_TRUE );
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}
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}
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//
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// check colormask
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//
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if( diff & ( GLS_REDMASK | GLS_GREENMASK | GLS_BLUEMASK | GLS_ALPHAMASK ) )
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{
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GLboolean r = ( stateBits & GLS_REDMASK ) ? GL_FALSE : GL_TRUE;
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GLboolean g = ( stateBits & GLS_GREENMASK ) ? GL_FALSE : GL_TRUE;
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GLboolean b = ( stateBits & GLS_BLUEMASK ) ? GL_FALSE : GL_TRUE;
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GLboolean a = ( stateBits & GLS_ALPHAMASK ) ? GL_FALSE : GL_TRUE;
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glColorMask( r, g, b, a );
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}
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//
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// fill/line mode
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//
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if( diff & GLS_POLYMODE_LINE )
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{
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if( stateBits & GLS_POLYMODE_LINE )
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{
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glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
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}
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else
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{
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glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
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}
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}
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//
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// polygon offset
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//
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if( diff & GLS_POLYGON_OFFSET )
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{
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if( stateBits & GLS_POLYGON_OFFSET )
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{
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glPolygonOffset( backEnd.glState.polyOfsScale, backEnd.glState.polyOfsBias );
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glEnable( GL_POLYGON_OFFSET_FILL );
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glEnable( GL_POLYGON_OFFSET_LINE );
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}
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else
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{
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glDisable( GL_POLYGON_OFFSET_FILL );
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glDisable( GL_POLYGON_OFFSET_LINE );
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}
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}
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#if !defined( USE_CORE_PROFILE )
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//
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// alpha test
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//
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if( diff & ( GLS_ALPHATEST_FUNC_BITS | GLS_ALPHATEST_FUNC_REF_BITS ) )
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{
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if( ( stateBits & GLS_ALPHATEST_FUNC_BITS ) != 0 )
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{
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glEnable( GL_ALPHA_TEST );
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GLenum func = GL_ALWAYS;
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switch( stateBits & GLS_ALPHATEST_FUNC_BITS )
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{
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case GLS_ALPHATEST_FUNC_LESS:
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func = GL_LESS;
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break;
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case GLS_ALPHATEST_FUNC_EQUAL:
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func = GL_EQUAL;
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break;
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case GLS_ALPHATEST_FUNC_GREATER:
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func = GL_GEQUAL;
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break;
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default:
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assert( false );
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}
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GLclampf ref = ( ( stateBits & GLS_ALPHATEST_FUNC_REF_BITS ) >> GLS_ALPHATEST_FUNC_REF_SHIFT ) / ( float )0xFF;
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glAlphaFunc( func, ref );
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}
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else
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{
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glDisable( GL_ALPHA_TEST );
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}
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}
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#endif
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//
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// stencil
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//
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if( diff & ( GLS_STENCIL_FUNC_BITS | GLS_STENCIL_OP_BITS ) )
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{
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if( ( stateBits & ( GLS_STENCIL_FUNC_BITS | GLS_STENCIL_OP_BITS ) ) != 0 )
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{
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glEnable( GL_STENCIL_TEST );
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}
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else
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{
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glDisable( GL_STENCIL_TEST );
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}
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}
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if( diff & ( GLS_STENCIL_FUNC_BITS | GLS_STENCIL_FUNC_REF_BITS | GLS_STENCIL_FUNC_MASK_BITS ) )
|
|
{
|
|
GLuint ref = GLuint( ( stateBits & GLS_STENCIL_FUNC_REF_BITS ) >> GLS_STENCIL_FUNC_REF_SHIFT );
|
|
GLuint mask = GLuint( ( stateBits & GLS_STENCIL_FUNC_MASK_BITS ) >> GLS_STENCIL_FUNC_MASK_SHIFT );
|
|
GLenum func = 0;
|
|
|
|
switch( stateBits & GLS_STENCIL_FUNC_BITS )
|
|
{
|
|
case GLS_STENCIL_FUNC_NEVER:
|
|
func = GL_NEVER;
|
|
break;
|
|
case GLS_STENCIL_FUNC_LESS:
|
|
func = GL_LESS;
|
|
break;
|
|
case GLS_STENCIL_FUNC_EQUAL:
|
|
func = GL_EQUAL;
|
|
break;
|
|
case GLS_STENCIL_FUNC_LEQUAL:
|
|
func = GL_LEQUAL;
|
|
break;
|
|
case GLS_STENCIL_FUNC_GREATER:
|
|
func = GL_GREATER;
|
|
break;
|
|
case GLS_STENCIL_FUNC_NOTEQUAL:
|
|
func = GL_NOTEQUAL;
|
|
break;
|
|
case GLS_STENCIL_FUNC_GEQUAL:
|
|
func = GL_GEQUAL;
|
|
break;
|
|
case GLS_STENCIL_FUNC_ALWAYS:
|
|
func = GL_ALWAYS;
|
|
break;
|
|
}
|
|
glStencilFunc( func, ref, mask );
|
|
}
|
|
if( diff & ( GLS_STENCIL_OP_FAIL_BITS | GLS_STENCIL_OP_ZFAIL_BITS | GLS_STENCIL_OP_PASS_BITS ) )
|
|
{
|
|
GLenum sFail = 0;
|
|
GLenum zFail = 0;
|
|
GLenum pass = 0;
|
|
|
|
switch( stateBits & GLS_STENCIL_OP_FAIL_BITS )
|
|
{
|
|
case GLS_STENCIL_OP_FAIL_KEEP:
|
|
sFail = GL_KEEP;
|
|
break;
|
|
case GLS_STENCIL_OP_FAIL_ZERO:
|
|
sFail = GL_ZERO;
|
|
break;
|
|
case GLS_STENCIL_OP_FAIL_REPLACE:
|
|
sFail = GL_REPLACE;
|
|
break;
|
|
case GLS_STENCIL_OP_FAIL_INCR:
|
|
sFail = GL_INCR;
|
|
break;
|
|
case GLS_STENCIL_OP_FAIL_DECR:
|
|
sFail = GL_DECR;
|
|
break;
|
|
case GLS_STENCIL_OP_FAIL_INVERT:
|
|
sFail = GL_INVERT;
|
|
break;
|
|
case GLS_STENCIL_OP_FAIL_INCR_WRAP:
|
|
sFail = GL_INCR_WRAP;
|
|
break;
|
|
case GLS_STENCIL_OP_FAIL_DECR_WRAP:
|
|
sFail = GL_DECR_WRAP;
|
|
break;
|
|
}
|
|
switch( stateBits & GLS_STENCIL_OP_ZFAIL_BITS )
|
|
{
|
|
case GLS_STENCIL_OP_ZFAIL_KEEP:
|
|
zFail = GL_KEEP;
|
|
break;
|
|
case GLS_STENCIL_OP_ZFAIL_ZERO:
|
|
zFail = GL_ZERO;
|
|
break;
|
|
case GLS_STENCIL_OP_ZFAIL_REPLACE:
|
|
zFail = GL_REPLACE;
|
|
break;
|
|
case GLS_STENCIL_OP_ZFAIL_INCR:
|
|
zFail = GL_INCR;
|
|
break;
|
|
case GLS_STENCIL_OP_ZFAIL_DECR:
|
|
zFail = GL_DECR;
|
|
break;
|
|
case GLS_STENCIL_OP_ZFAIL_INVERT:
|
|
zFail = GL_INVERT;
|
|
break;
|
|
case GLS_STENCIL_OP_ZFAIL_INCR_WRAP:
|
|
zFail = GL_INCR_WRAP;
|
|
break;
|
|
case GLS_STENCIL_OP_ZFAIL_DECR_WRAP:
|
|
zFail = GL_DECR_WRAP;
|
|
break;
|
|
}
|
|
switch( stateBits & GLS_STENCIL_OP_PASS_BITS )
|
|
{
|
|
case GLS_STENCIL_OP_PASS_KEEP:
|
|
pass = GL_KEEP;
|
|
break;
|
|
case GLS_STENCIL_OP_PASS_ZERO:
|
|
pass = GL_ZERO;
|
|
break;
|
|
case GLS_STENCIL_OP_PASS_REPLACE:
|
|
pass = GL_REPLACE;
|
|
break;
|
|
case GLS_STENCIL_OP_PASS_INCR:
|
|
pass = GL_INCR;
|
|
break;
|
|
case GLS_STENCIL_OP_PASS_DECR:
|
|
pass = GL_DECR;
|
|
break;
|
|
case GLS_STENCIL_OP_PASS_INVERT:
|
|
pass = GL_INVERT;
|
|
break;
|
|
case GLS_STENCIL_OP_PASS_INCR_WRAP:
|
|
pass = GL_INCR_WRAP;
|
|
break;
|
|
case GLS_STENCIL_OP_PASS_DECR_WRAP:
|
|
pass = GL_DECR_WRAP;
|
|
break;
|
|
}
|
|
glStencilOp( sFail, zFail, pass );
|
|
}
|
|
|
|
backEnd.glState.glStateBits = stateBits;
|
|
}
|
|
|
|
/*
|
|
=================
|
|
GL_GetCurrentState
|
|
=================
|
|
*/
|
|
uint64 GL_GetCurrentState()
|
|
{
|
|
return backEnd.glState.glStateBits;
|
|
}
|
|
|
|
/*
|
|
========================
|
|
GL_GetCurrentStateMinusStencil
|
|
========================
|
|
*/
|
|
uint64 GL_GetCurrentStateMinusStencil()
|
|
{
|
|
return GL_GetCurrentState() & ~( GLS_STENCIL_OP_BITS | GLS_STENCIL_FUNC_BITS | GLS_STENCIL_FUNC_REF_BITS | GLS_STENCIL_FUNC_MASK_BITS );
|
|
}
|