diff --git a/include/vkcv/PipelineConfig.hpp b/include/vkcv/PipelineConfig.hpp index 0d29625aec6b7f607372e5f0c147ff32f229ad03..b1dd56d5ddb29d6f986bfa490d3cb7bdfb37c4ca 100644 --- a/include/vkcv/PipelineConfig.hpp +++ b/include/vkcv/PipelineConfig.hpp @@ -32,7 +32,8 @@ namespace vkcv { Multisampling m_multisampling = Multisampling::None; CullMode m_culling = CullMode::None; DepthTest m_depthTest = DepthTest::LessEqual; - bool m_depthWrite = true; + bool m_depthWrite = true; + bool m_alphaToCoverage = false; }; } \ No newline at end of file diff --git a/projects/voxelization/resources/shaders/depthPrepass.frag b/projects/voxelization/resources/shaders/depthPrepass.frag index b2401639ed93a97cedd0cab30cbdded2ef5b56ab..5e2f7a092ca300af40cc039608a44d080c28730f 100644 --- a/projects/voxelization/resources/shaders/depthPrepass.frag +++ b/projects/voxelization/resources/shaders/depthPrepass.frag @@ -6,9 +6,15 @@ layout(location = 0) in vec2 passUV; +layout(location = 0) out vec4 outColor; // only used for alpha to coverage, not actually written to + +// coverage to alpha techniques explained in: https://bgolus.medium.com/anti-aliased-alpha-test-the-esoteric-alpha-to-coverage-8b177335ae4f void main() { - float alpha = texture(sampler2D(albedoTexture, textureSampler), passUV).a; - if(alpha < 0.5){ - discard; - } + float alpha = texture(sampler2D(albedoTexture, textureSampler), passUV).a; + float alphaCutoff = 0.5; + + // scale alpha to one pixel width + alpha = (alpha - alphaCutoff) / max(fwidth(alpha), 0.0001) + 0.5; + + outColor.a = alpha; } \ No newline at end of file diff --git a/projects/voxelization/src/main.cpp b/projects/voxelization/src/main.cpp index c3ca1c7f6a1f04883ede6f6e41230c91bcd49058..d2b1ca56c627fd72a3828164c7a22152c4f6c635 100644 --- a/projects/voxelization/src/main.cpp +++ b/projects/voxelization/src/main.cpp @@ -263,9 +263,10 @@ int main(int argc, const char** argv) { core.getDescriptorSet(prepassDescriptorSet).layout, core.getDescriptorSet(perMeshDescriptorSets[0]).layout }, true }; - prepassPipelineConfig.m_culling = vkcv::CullMode::Back; - prepassPipelineConfig.m_multisampling = msaa; - prepassPipelineConfig.m_depthTest = vkcv::DepthTest::LessEqual; + prepassPipelineConfig.m_culling = vkcv::CullMode::Back; + prepassPipelineConfig.m_multisampling = msaa; + prepassPipelineConfig.m_depthTest = vkcv::DepthTest::LessEqual; + prepassPipelineConfig.m_alphaToCoverage = true; vkcv::PipelineHandle prepassPipeline = core.createGraphicsPipeline(prepassPipelineConfig); diff --git a/src/vkcv/PipelineManager.cpp b/src/vkcv/PipelineManager.cpp index ca0f9225759cc7f4e16b1ba9596f2b9fd6275464..212e5b56e8ed7469a6e6368d9c61317ea08d5ad1 100644 --- a/src/vkcv/PipelineManager.cpp +++ b/src/vkcv/PipelineManager.cpp @@ -193,7 +193,7 @@ namespace vkcv false, 0.f, nullptr, - false, + config.m_alphaToCoverage, false );