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117 lines
4.3 KiB
C++
117 lines
4.3 KiB
C++
/*
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** gl_samplers.cpp
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**
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** Texture sampler handling
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**
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**---------------------------------------------------------------------------
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** Copyright 2015-2019 Christoph Oelckers
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include "gl_load.h"
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#include "glbackend.h"
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struct TexFilter_s
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{
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int minfilter;
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int magfilter;
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bool mipmapping;
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} ;
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TexFilter_s TexFilter[]={
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{GL_NEAREST, GL_NEAREST, false},
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{GL_LINEAR, GL_LINEAR, false},
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{GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST, true},
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{GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR, true},
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{GL_NEAREST_MIPMAP_LINEAR, GL_NEAREST, true},
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{GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, true},
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{GL_LINEAR_MIPMAP_LINEAR, GL_NEAREST, true},
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};
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FSamplerManager::FSamplerManager()
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{
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glGenSamplers(NumSamplers, mSamplers);
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for (int i = SamplerNoFilterRepeat; i <= SamplerNoFilterClampXY; i++)
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{
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glSamplerParameteri(mSamplers[i], GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glSamplerParameteri(mSamplers[i], GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glSamplerParameterf(mSamplers[i], GL_TEXTURE_MAX_ANISOTROPY_EXT, 1.f);
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}
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glSamplerParameteri(mSamplers[SamplerClampX], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glSamplerParameteri(mSamplers[SamplerClampY], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glSamplerParameteri(mSamplers[SamplerClampXY], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glSamplerParameteri(mSamplers[SamplerClampXY], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glSamplerParameteri(mSamplers[SamplerNoFilterClampX], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glSamplerParameteri(mSamplers[SamplerNoFilterClampY], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glSamplerParameteri(mSamplers[SamplerNoFilterClampXY], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glSamplerParameteri(mSamplers[SamplerNoFilterClampXY], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glSamplerParameteri(mSamplers[Sampler2DFiltered], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glSamplerParameteri(mSamplers[Sampler2DFiltered], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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}
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FSamplerManager::~FSamplerManager()
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{
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UnbindAll();
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glDeleteSamplers(NumSamplers, mSamplers);
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}
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void FSamplerManager::UnbindAll()
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{
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for (int i = 0; i < 16 /* fixme */; i++)
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{
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glBindSampler(i, 0);
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}
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}
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uint8_t FSamplerManager::Bind(int texunit, int num, int lastval)
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{
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unsigned int samp = mSamplers[num];
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glBindSampler(texunit, samp);
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return 255;
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}
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void FSamplerManager::SetTextureFilterMode(int filter, int anisotropy)
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{
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UnbindAll();
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for (int i = SamplerRepeat; i <= SamplerClampXY; i++)
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{
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glSamplerParameteri(mSamplers[i], GL_TEXTURE_MIN_FILTER, TexFilter[filter].minfilter);
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glSamplerParameteri(mSamplers[i], GL_TEXTURE_MAG_FILTER, TexFilter[filter].magfilter);
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glSamplerParameterf(mSamplers[i], GL_TEXTURE_MAX_ANISOTROPY_EXT, anisotropy);
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}
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glSamplerParameteri(mSamplers[Sampler2DFiltered], GL_TEXTURE_MIN_FILTER, TexFilter[filter].magfilter);
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glSamplerParameteri(mSamplers[Sampler2DFiltered], GL_TEXTURE_MAG_FILTER, TexFilter[filter].magfilter);
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}
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