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Initial submit of WEBGL_multisampled_render_to_texture proposal
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extensions/proposals/WEBGL_multisampled_render_to_texture/extension.xml
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| <?xml version="1.0"?> | ||
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| <extension href="WEBGL_multisampled_render_to_texture/"> | ||
| <name>WEBGL_multisampled_render_to_texture</name> | ||
| <contact> | ||
| <a href="https://www.khronos.org/webgl/public-mailing-list/">WebGL working group</a> (public_webgl 'at' khronos.org) | ||
| </contact> | ||
| <contributors> | ||
| <contributor>Rik Cabanier, Facebook</contributor> | ||
| </contributors> | ||
| <number>??</number> | ||
| <depends> | ||
| <api version="1.0"/> | ||
| </depends> | ||
| <overview> | ||
| <mirrors href="https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_multisampled_render_to_texture2.txt" name="EXT_multisampled_render_to_texture2"> | ||
| </mirrors> | ||
| <features> | ||
| <feature> | ||
| Adds support for rendering multisampled to a color renderable texture, without requiring an explicit resolve of multisample data. | ||
| </feature> | ||
| </features> | ||
| </overview> | ||
| <idl xml:space="preserve"> | ||
| [Exposed=(Window,Worker), LegacyNoInterfaceObject] | ||
| interface WEBGL_multisampled_render_to_texture { | ||
| const GLenum RENDERBUFFER_SAMPLES_EXT = 0x8CAB; | ||
| const GLenum FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT = 0x8D56; | ||
| const GLenum MAX_SAMPLES_EXT = 0x8D57; | ||
| const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT = 0x8D6C; | ||
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| undefined renderbufferStorageMultisampleEXT( | ||
| GLenum target, GLsizei samples, | ||
| GLenum internalformat, | ||
| GLsizei width, GLsizei height); | ||
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| undefined framebufferTexture2DMultisampleEXT( | ||
| GLenum target, GLenum attachment, | ||
| GLenum textarget, WebGLTexture? texture, | ||
| GLint level, GLsizei samples); | ||
| }; | ||
| </idl> | ||
| <newfun> | ||
| <function name="renderbufferStorageMultisampleEXT" type="undefined"> | ||
| <param name="target" type="GLenum"/> | ||
| <param name="samples" type="GLsizei"/> | ||
| <param name="internalformat" type="GLenum"/> | ||
| <param name="width" type="GLsizei"/> | ||
| <param name="height" type="GLsizei"/> | ||
| </function> | ||
| </newfun> | ||
| <newfun> | ||
| <function name="framebufferTexture2DMultisampleEXT" type="undefined"> | ||
| <param name="target" type="GLenum"/> | ||
| <param name="attachment" type="GLenum"/> | ||
| <param name="textarget" type="GLenum"/> | ||
| <param name="texture" type="GLuint"/> | ||
| <param name="level" type="GLint"/> | ||
| <param name="samples" type="GLsizei"/> | ||
| </function> | ||
| </newfun> | ||
| <newtok> | ||
| <function name="GetRenderbufferParameter" type="any"> | ||
| <param name="target" type="GLenum"/> | ||
| <param name="pname" type="GLenum"/> | ||
| Calling with the <code>pname</code> set to <code>RENDERBUFFER_SAMPLES_EXT</code> returns the number of samples. | ||
| <br/> | ||
| <!-- | ||
| If <code>renderbufferStorageMultisampleEXT</code> is called with <code>samples</code> is zero, then <code>RENDERBUFFER_SAMPLES_EXT</code> is set to zero. | ||
| Otherwise <code>samples</code> represents a request for a desired minimum number | ||
| of samples. Since different implementations may support different | ||
| sample counts for multisampled rendering, the actual number of samples | ||
| allocated for the renderbuffer image is implementation-dependent. | ||
| However, the resulting value for <code>RENDERBUFFER_SAMPLES_EXT</code> is | ||
| guaranteed to be greater than or equal to samples and no more than the | ||
| next larger sample count supported by the implementation. | ||
| <br/> | ||
| --> | ||
| The return type depends on the parameter queried: | ||
| <table width="30%"> | ||
| <tr><th>pname</th><th>returned type</th></tr> | ||
| <tr><td>RENDERBUFFER_SAMPLES_EXT</td><td>GLint</td></tr> | ||
| </table> | ||
| </function> | ||
| <function name="checkFramebufferStatus" type="GLenum"> | ||
| <param name="target" type="GLenum"/> | ||
| </function> | ||
| <function name="getParameter" type="any"> | ||
| <param name="pname" type="GLenum"/> | ||
| Calling with the <code>pname</code> set to <code>MAX_SAMPLES_EXT</code> returns the maximum number of samples. | ||
| <br/> | ||
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| The return type depends on the parameter queried: | ||
| <table width="30%"> | ||
| <tr><th>pname</th><th>returned type</th></tr> | ||
| <tr><td>MAX_SAMPLES_EXT</td><td>GLint</td></tr> | ||
| </table> | ||
| </function> | ||
| <function name="getFramebufferAttachmentParameter" type="any"> | ||
| <param name="target" type="GLenum"/> | ||
| <param name="attachment" type="GLenum"/> | ||
| <param name="pname" type="GLenum"/> | ||
| Calling with the <code>pname</code> set to <code>FRAMEBUFFER_ATTACHMENT_TEXTURE_SAMPLES_EXT</code> returns the number of samples in the multisampled texture. | ||
| <br/> | ||
| The return type depends on the parameter queried: | ||
| <table width="30%"> | ||
| <tr><th>pname</th><th>returned type</th></tr> | ||
| <tr><td>MAX_SAMPLES_EXT</td><td>GLint</td></tr> | ||
| </table> | ||
| </function> | ||
| </newtok> | ||
| <errors> | ||
| <error> | ||
| The error <code>OUT_OF_MEMORY</code> is generated when <code>RenderbufferStorageMultisampleEXT</code> cannot create storage of the specified size. | ||
| </error> | ||
| <error> | ||
| If <code>RenderbufferStorageMultisampleEXT</code> is called with a value of <code>samples</code> that is greater than <code>MAX_SAMPLES_EXT</code>, then the error <code>INVALID_VALUE</code> is generated. | ||
| </error> | ||
| <error> | ||
| The error <code>INVALID_ENUM</code> is generated if<code> FramebufferTexture2DMultisampleEXT</code> is called with a target that is not <code>FRAMEBUFFER</code>, <code>DRAW_FRAMEBUFFER</code>, or <code>READ_FRAMEBUFFER</code>. | ||
| </error> | ||
| <error> | ||
| The error <code>INVALID_ENUM</code> is generated if <code>FramebufferTexture2DMultisampleEXT</code> is called with an <code>attachment</code> that is not <code>COLOR_ATTACHMENT0</code>. | ||
| </error> | ||
| <error> | ||
| The error <code>INVALID_ENUM</code> is generated if <code>FramebufferTexture2DMultisampleEXT</code> is called with a textarget that is not <code>TEXTURE_2D</code>, <code>TEXTURE_CUBE_MAP_POSITIVE_X</code>, <code>TEXTURE_CUBE_MAP_POSITIVE_Y</code>, <code>TEXTURE_CUBE_MAP_POSITIVE_Z</code>, <code>TEXTURE_CUBE_MAP_NEGATIVE_X</code>, <code>TEXTURE_CUBE_MAP_NEGATIVE_Y</code>, or <code>TEXTURE_CUBE_MAP_NEGATIVE_Z</code>. | ||
| </error> | ||
| <error> | ||
| The error <code>INVALID_OPERATION</code> is generated if <code>FramebufferTexture2DMultisampleEXT</code> is called with samples greater than the maximum number of samples supported for target and its internalformat. | ||
| </error> | ||
| </errors> | ||
| <samplecode xml:space="preserve"> | ||
| <pre> | ||
| var gl = document.createElement('canvas').getContext('webgl2'); | ||
| var ext = gl.getExtension('WEBGL_multisampled_render_to_texture'); | ||
| var samples = gl.getParameter(ext.MAX_SAMPLES_EXT); | ||
| var fb = gl.createFramebuffer(); | ||
| gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, fb); | ||
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| // Create color texture and storage. | ||
| var colorTex = gl.createTexture(); | ||
| gl.bindTexture(gl.TEXTURE_2D, colorTex); | ||
| gl.texStorage2D(gl.TEXTURE_2D, 1, gl.RGBA8, 512, 512); | ||
| ext.framebufferTexture2DMultisampleEXT(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, colorTex, 0, samples); | ||
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| // Create depth texture and storage. | ||
| var depthStencilTex = gl.createTexture(); | ||
| gl.bindTexture(gl.TEXTURE_2D, depthStencilTex); | ||
| ext.renderbufferStorageMultisampleEXT(gl.RENDER_BUFFER, samples, gl.DEPTH32F_STENCIL8, 512, 512); | ||
| ext.framebufferTexture2DMultisampleEXT(gl.DRAW_FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.TEXTURE_2D, depthStencilTex, 0, samples); | ||
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| gl.drawElements(...); // Draw will be done with multisampling and flushed to the non-multisample texture. | ||
| </pre> | ||
| </samplecode> | ||
| <history> | ||
| <revision date="2021/10/09"> | ||
| <change>Initial revision.</change> | ||
| </revision> | ||
| </history> | ||
| </extension> |