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Merge branch 'alpha-meddling-shader-side-mip-meddling' into alpha-meddling

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This commit is contained in:
AnyOldName3 2021-03-13 01:23:30 +00:00
commit 0431ba4c87
6 changed files with 44 additions and 1 deletions
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7
components/sceneutil/mwshadowtechnique.cpp
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@ -894,12 +894,17 @@ void SceneUtil::MWShadowTechnique::setupCastingShader(Shader::ShaderManager & sh
// This can't be part of the constructor as OSG mandates that there be a trivial constructor available
osg::ref_ptr<osg::Shader> castingVertexShader = shaderManager.getShader("shadowcasting_vertex.glsl", {}, osg::Shader::VERTEX);
osg::ref_ptr<osg::GLExtensions> exts = osg::GLExtensions::Get(0, false);
std::string useGPUShader4 = exts && exts->isGpuShader4Supported ? "1" : "0";
for (int alphaFunc = GL_NEVER; alphaFunc <= GL_ALWAYS; ++alphaFunc)
{
auto& program = _castingPrograms[alphaFunc - GL_NEVER];
program = new osg::Program();
program->addShader(castingVertexShader);
program->addShader(shaderManager.getShader("shadowcasting_fragment.glsl", { {"alphaFunc", std::to_string(alphaFunc)}, {"alphaToCoverage", "0"} }, osg::Shader::FRAGMENT));
program->addShader(shaderManager.getShader("shadowcasting_fragment.glsl", { {"alphaFunc", std::to_string(alphaFunc)},
{"alphaToCoverage", "0"},
{"useGPUShader4", useGPUShader4}
}, osg::Shader::FRAGMENT));
}
}

7
components/shader/shadervisitor.cpp
View file

@ -2,6 +2,7 @@
#include <osg/AlphaFunc>
#include <osg/Geometry>
#include <osg/GLExtensions>
#include <osg/Material>
#include <osg/Multisample>
#include <osg/Texture>
@ -412,6 +413,12 @@ namespace Shader
writableStateSet->setMode(GL_SAMPLE_ALPHA_TO_COVERAGE_ARB, osg::StateAttribute::ON);
defineMap["alphaToCoverage"] = "1";
}
// Preventing alpha tested stuff shrinking as lower mip levels are used requires knowing the texture size
osg::ref_ptr<osg::GLExtensions> exts = osg::GLExtensions::Get(0, false);
if (exts && exts->isGpuShader4Supported)
defineMap["useGPUShader4"] = "1";
// We could fall back to a texture size uniform if EXT_gpu_shader4 is missing
}
if (writableStateSet->getMode(GL_ALPHA_TEST) != osg::StateAttribute::INHERIT)