MultiSampleAntiAliasing QML Type

启用多采样抗锯齿。更多

Import Statement:	`import Qt3D.Render 2.9`
In C++:	QMultiSampleAntiAliasing
Inherits:	RenderState
Status:	Deprecated

所有成员（包括继承成员）的列表

详细说明

MultiSampleAntiAliasing 类型可启用多采样抗锯齿。

它可以添加到RenderPass ：

RenderPass {
    shaderProgram: ShaderProgram {
        // ...
    }
    renderStates: [
        MultiSampleAntiAliasing {}
    ]
}

或RenderStateSet ：

RenderStateSet {
    renderStates: [
        MultiSampleAntiAliasing {}
    ]
}

要使多重采样生效，必须在启用多重采样的情况下分配渲染目标：

RenderTarget {
    attachments: [
        RenderTargetOutput {
            attachmentPoint: RenderTargetOutput.Color0
            texture: Texture2DMultisample {
                width: 1024
                height: 1024
                format: Texture.RGBA8_UNorm
            }
        },
        RenderTargetOutput {
            attachmentPoint: RenderTargetOutput.DepthStencil
            texture: Texture2DMultisample{
                width: 1024
                height: 1024
                format: Texture.D24S8
            }
        }
    ]
}

此外，着色器代码必须使用多重采样采样器类型和 texelFetch() 而不是 texture()。

此外，着色器代码必须使用多采样采样器类型和 texelFetch() 而不是纹理()。

例如

#version 150

uniform sampler2D colorTexture;
in vec2 texCoord;
out vec4 fragColor;

void main()
{
    fragColor = texture(colorTexture, texCoord);
}

的代码，可以重写为

#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;
}

注意： 使用 OpenGL 作为图形 API 时，如果在渲染状态中添加了多重采样抗锯齿功能，则会调用 glEnable(GL_MULTISAMPLE)。

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