Multisample Texture: Difference between revisions

Revision as of 18:25, 14 May 2021

A Multisample Texture is a Texture that can have multiple samples per pixel, thereby allowing it to be used in multisampled rendering. As they are textures, their multiple samples can also be fetched from shaders.

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There are only two multisampled texture targets: 2D textures, and 2D array textures (GL_TEXTURE_2D_MULTISAMPLE and GL_TEXTURE_2D_ARRAY_MULTISAMPLE respectively).

Creating a multisample texture requires using glTexStorage2DMultisample, glTexStorage3DMultisample for 2D array textures (or the glTexImage*Multisample equivalents:

GLuint tex;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, tex);
glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, w, h, GL_TRUE);

//Attach to an FBO:
glFramebufferTexture(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, tex, 0);

Similar functions are provided for using multisample render buffer with your frame buffer: e.g.: glRenderbufferStorageMultisample

You may use glBlitFramebuffer to perform a multisample resolve operation by copying to a non-multisampled framebuffer object.

@@ Line 1: / Line 1: @@
-A '''Multisample Texture''' is a [[Texture]] that can have multiple samples per pixel. This allows them to be used as [[Multisampling|multisample]] render targets and also as source data for [[Shader|shaders]].
+A '''Multisample Texture''' is a [[Texture]] that can have [[Multisampling|multiple samples per pixel]], thereby allowing it to be used in multisampled rendering. As they are textures, their multiple samples can also be fetched from [[Shader|shaders]].
-As you would use glTexImage2D , here we can use glTexImage2DMultisample.
+{{stub}}
-Primary use is for creating Frame buffers and providing them support for multi sampling:
-        glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, t);
+There are only two multisampled texture targets: 2D textures, and 2D array textures ({{enum|GL_TEXTURE_2D_MULTISAMPLE}} and {{enum|GL_TEXTURE_2D_ARRAY_MULTISAMPLE}} respectively).
-        glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGB, w, h, GL_TRUE);
-Now you may use this texture with your Frame buffer object:
-        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, t, 0);
-Similar functions are provided for using multisample render buffer with your frame buffer: e.g.: '''glRenderbufferStorageMultisample'''
+Creating a multisample texture requires using {{apifunc|glTexStorage2DMultisample}}, {{apifunc|glTexStorage3DMultisample}} for 2D array textures (or the {{code|glTexImage*Multisample}} equivalents:
-You may use '''glBlitFramebuffer''' to copy this Frame buffer to any regular frame buffer.
+<syntaxhighlight lang="cpp">
+GLuint tex;
+glGenTextures(1, &tex);
+glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, tex);
+glTexStorage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4, GL_RGBA8, w, h, GL_TRUE);
+//Attach to an FBO:
+glFramebufferTexture(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, tex, 0);
+</syntaxhighlight>
+Similar functions are provided for using multisample render buffer with your frame buffer: e.g.: {{apifunc|glRenderbufferStorageMultisample}}
+You may use {{apifunc|glBlitFramebuffer}} to perform a [[Multisampling#Multisample_Resolve|multisample resolve operation]] by [[Framebuffer#Blitting|copying to a non-multisampled framebuffer object]].
 [[Category:Textures]]

Multisample Texture: Difference between revisions

Revision as of 18:25, 14 May 2021

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