QMultiSampleAntiAliasing露
- PyQt5.Qt3DRender.QMultiSampleAntiAliasing
Inherits from QRenderState.
Description露
Enable multisample antialiasing.
A QMultiSampleAntiAliasing class enables multisample antialiasing.
It can be added to a QRenderPass by calling QRenderPass::addRenderState():
QRenderPass *renderPass = new QRenderPass();
QMultiSampleAntiAliasing *msaa = new QMultiSampleAntiAliasing();
renderPass->addRenderState(msaa);
Or a QRenderStateSet by calling QRenderStateSet::addRenderState():
QRenderStateSet *renderStateSet = new QRenderStateSet();
QMultiSampleAntiAliasing *msaa = new QMultiSampleAntiAliasing();
renderStateSet->addRenderState(msaa);
For multisampling to take effect, the render target must have been allocated with multisampling enabled:
QTexture2DMultisample *colorTex = new QTexture2DMultisample;
colorTex->setFormat(QAbstractTexture::RGBA8_UNorm);
colorTex->setWidth(1024);
colorTex->setHeight(1024);
QRenderTargetOutput *color = new QRenderTargetOutput;
color->setAttachmentPoint(QRenderTargetOutput::Color0);
color->setTexture(colorTex);
QTexture2DMultisample *depthStencilTex = new QTexture2DMultisample;
depthStencilTex->setFormat(QAbstractTexture::RGBA8_UNorm);
depthStencilTex->setWidth(1024);
depthStencilTex->setHeight(1024);
QRenderTargetOutput *depthStencil = new QRenderTargetOutput;
depthStencil->setAttachmentPoint(QRenderTargetOutput::DepthStencil);
depthStencil->setTexture(depthStencilTex);
Qt3DRender::QRenderTarget *renderTarget = new Qt3DRender::QRenderTarget;
renderTarget->addOutput(color);
renderTarget->addOutput(depthStencil);
Further, the shader code must use multisampling sampler types and texelFetch() instead of texture().
For example, if you have code like
#version 150
uniform sampler2D colorTexture;
in vec2 texCoord;
out vec4 fragColor;
void main()
{
fragColor = texture(colorTexture, texCoord);
}
you can rewrite it as
#version 150
uniform sampler2DMS colorTexture;
in vec2 texCoord;
out vec4 fragColor;
void main()
{
ivec2 tc = ivec2(floor(textureSize(colorTexture) * texCoord));
vec4 c = texelFetch(colorTexture, tc, 0) +
texelFetch(colorTexture, tc, 1) +
texelFetch(colorTexture, tc, 2) +
texelFetch(colorTexture, tc, 3);
fragColor = c / 4.0;
}
Note: When using OpenGL as the graphics API, glEnable(GL_MULTISAMPLE) will be called if QMultiSampleAntiAliasing has been added to the render states.
