Experimental:GLSL POP

Summary

This POP allows you to modify input attributes with GLSL. It works on a single attribute class at a time, Points, Verts or Primitives, and doesn't allow to change the number of input elements (Points, Verts or Primitives).

Refer to the Write GLSL POPs article for more info on using this POP.

See also GLSL Advanced POP

glslPOP_Class

Parameters - GLSL Page

Compute Shader computedat -

Attribute Class attrclass - ⊞ -

• Point point -

• Vertex vertex -

• Primitive primitive -

Number of Threads numthreadsmode - ⊞ -

• Auto auto -

• Number of Elements in Other Input otherinputelements -

• Manual manual -

• Manual Number of Elements numelems -

• Number of Elements from Attribute numelemsattrib -

Threads Input threadsinput -

Number of Elements numelems -

POP numelemspop -

Num Elements Attrib numelemsclass - ⊞ -

• Point point -

• Vertex vertex -

• Primitive primitive -

Num Elements Attrib numelemsattr -

Work Group Size workgroupsize - ⊞ -

• Work Group Size workgroupsizex -

• Work Group Size workgroupsizey -

• Work Group Size workgroupsizez -

Dispatch Size dispatchsize - ⊞ -

• Dispatch Size dispatchsizex -

• Dispatch Size dispatchsizey -

• Dispatch Size dispatchsizez -

Output Attributes outputattrs - ⊞ -

• * * -

Output Access outputaccess - ⊞ -

• Write Only writeonly -

• Read-Write readwrite -

Initialize Output Attributes initoutputattrs -

Copy Previous Pass Output to Input prevpassoutput -

Passes npasses -

Input input -

In POPs input0pops -

TDSimplexNoise() simplexnoise - ⊞ - Pick between Performance vs Quality Simplex noise. Performance mode picks the existing TDSimplexNoise(). Quality noise reduces certain artifacts and axis alignment issues with the existing simplex noise at the cost of speed.

• Performance performance - Performant noise.

• Quality quality - Quality noise.

Parameters - Create Attributes Page

New Attribute attr -

New Attribute Name attr0name - ⊞ -

• Custom custom -

• N n -

• Color color -

• Tex tex -

• PointScale pointscale -

• LineWidth linewidth -

Custom Name attr0customname -

New Attribute Type attr0type - ⊞ -

• float float -

• double double -

• int int -

• uint uint -

• vector vector -

• dvector dvector -

• dir dir -

• dbl dir ddir -

New Attribute Number of Components attr0numcomps - ⊞ -

• 1 1 -

• 2 2 -

• 3 3 -

• 4 4 -

Array attr0isarray -

New Attribute Array Size attr0arraysize -

Value attr0value - ⊞ -

• Value attr0valuer -

• Value attr0valueg -

• Value attr0valueb -

• Value attr0valuea -

Matrix Attribute matattr -

Custom Matrix Name matattr0name -

Rows matattr0numrows -

Columns matattr0numcols -

Array matattr0isarray -

Array Size matattr0arraysize -

Qualifier matattr0qualifier - ⊞ -

• None none -

• Transform Matrix transformMatrix -

Parameters - Vectors Page

Vector vec -

Name vec0name -

Type vec0type - ⊞ -

• float float -

• vec2 vec2 -

• vec3 vec3 -

• vec4 vec4 -

• double double -

• dvec2 dvec2 -

• dvec3 dvec3 -

• dvec4 dvec4 -

• int int -

• ivec2 ivec2 -

• ivec3 ivec3 -

• ivec4 ivec4 -

• uint uint -

• uvec2 uvec2 -

• uvec3 uvec3 -

• uvec4 uvec4 -

Value vec0value - ⊞ -

• Value vec0valuex -

• Value vec0valuey -

• Value vec0valuez -

• Value vec0valuew -

Parameters - Samplers Page

Sampler sampler -

Name sampler0name -

TOP sampler0top - ⊞ -

Extend U sampler0extendu - ⊞ -

• Hold hold -

• Zero zero -

• Repeat repeat -

• Mirror mirror -

Extend V sampler0extendv - ⊞ -

• Hold hold -

• Zero zero -

• Repeat repeat -

• Mirror mirror -

Extend W sampler0extendw - ⊞ -

• Hold hold -

• Zero zero -

• Repeat repeat -

• Mirror mirror -

Filter sampler0filter - ⊞ -

• Nearest Pixel nearest -

• Interpolate Pixels linear -

Parameters - Arrays Page

Array array -

Name array0name -

Type array0type - ⊞ -

• float float -

• vec2 vec2 -

• vec3 vec3 -

• vec4 vec4 -

CHOP array0chop -

Parameters - Matrices Page

Matrix matrix -

Name matrix0name -

Matrix matrix0value -

Parameters - Temp Buffers Page

Temp Buffer tempbuffer -

Name tempbuffer0name -

Initial Value tempbuffer0initval -

Parameters - Constants Page

Constant const -

Name const0name -

Value const0value -

Parameters - Common Page

Bypass bypass -

Delete Input Attributes delinputattrs -

Parameter Color Space parmcolorspace - ⊞ - Controls how all color parameters on this node are interpreted. The color values as treated as being in the selected color space, and are converted to the Working Color Space before they are used as part of the node's operation. Note that this does not change the color space of the node itself, as that is always in the Working Color Space.

• sRGB srgb - sRGB color space, with sRGB transfer function. Considered an SDR color space with respect to Reference White.

• sRGB - Linear srgblinear - sRGB color space, with linear transfer function. Considered an SDR color space with respect to Reference White.

• Rec.601 (NTSC) rec601ntsc - Rec.601 with NTSC primaries color space, with Rec.601 transfer function. Considered an SDR color space with respect to Reference White.

• Rec.709 rec709 - Rec.709 color space, with Rec.709 (same as Rec.2020) transfer function. Considered an SDR color space with respect to Reference White.

• Rec.2020 rec2020 - Rec.2020 color space, with Rec.2020 (same as Rec.709) transfer function. Considered an HDR color space with respect to Reference White.

• DCI-P3 dcip3 - DCI-P3 color space, with D65 white point and 2.6 gamma transfer function. Considered an HDR color space with respect to Reference White.

• DCI-P3 (D60) dcip3d60 - DCI-P3 "D60 sim" color space, with D60 white point, and 2.6 gamma transfer function. Considered an HDR color space with respect to Reference White.

• Display-P3 (D65) displayp3d65 - Display-P3 color space, with D65 white point, and sRGB gamma transfer function. Considered an HDR color space with respect to Reference White.

• ACES2065-1 aces2065-1 - ACES 2065-1 (also known as ACES AP0) color space, with a linear gamma transfer function. Considered an HDR color space with respect to Reference White.

• ACEScg acescg - ACEScg (also known as ACES AP1) color space, with a linear gamma transfer function. Considered an HDR color space with respect to Reference White.

• Passthrough passthrough - When selected, the color values will be used as-is in the operation, without any modification or attempt to convert them into the Working Color Space.

Parameter Reference White parmreferencewhite - ⊞ - When converting a parameter color value to the Working Color Space, this controls how it should be treated with respect to Reference White. If the Working Color Space is the same Reference White, then no adjustment is done. If they are different, then the Reference White level (brightness) of this color will be adjusted to the range expected by the Working Color Space. For example if the project is set to have a SDR Reference White of 120 nits, and the HDR Reference White is 80 nits, then a color of (1, 1, 1), which is 120 nits in the SDR color space, will be converted to be (1.5, 1.5, 1.5), which is 120 nits still in the HDR Working Color Space.

• Default For Color Space default - Will use either the SDR or the HDR Reference White, based on the color space selected.

• Standard (SDR) sdr - Will treat the Parameter Color Space as SDR for it's reference white value.

• High (HDR) hdr - Will treat the Parameter Color Space as HDR for it's reference white value.

Operator Inputs

• Input 0: -

Info CHOP Channels

Extra Information for the GLSL POP can be accessed via an Info CHOP.

Common Operator Info Channels

• total_cooks - Number of times the operator has cooked since the process started.

• cook_time - Duration of the last cook in milliseconds.

• cook_frame - Frame number when this operator was last cooked relative to the component timeline.

• cook_abs_frame - Frame number when this operator was last cooked relative to the absolute time.

• cook_start_time - Time in milliseconds at which the operator started cooking in the frame it was cooked.

• cook_end_time - Time in milliseconds at which the operator finished cooking in the frame it was cooked.

• cooked_this_frame - 1 if operator was cooked this frame.

• warnings - Number of warnings in this operator if any.

• errors - Number of errors in this operator if any.

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The OpenGL (pre-2022) or Vulkan (2022-) code that runs on the GPU and creates rendered images from polygons and textures. A shader is programmed in Text DATs and referenced by a GLSL Material or a GLSL TOP. Shaders are composed of up to three parts: Vertex Shader, Pixel Shader and Compute Shader.

Each SOP has a list of Points. Each point has an XYZ 3D position value plus other optional attributes. Each polygon Primitive is defined by a vertex list, which is list of point numbers.

A sequence of vertices form a Polygon in a SOP. Each vertex is an integer index into the Point List, and each Point holds an XYZ position and attributes like Normals and Texture Coordinates.

A surface type in SOPs that includes polygon, curve (NURBS and Bezier), patch (NURBS and Bezier) and other basic shapes like sphere, tube and metaball. Points and Primitives are part of the Geometry Detail, which is a part of a SOP.

Information associated with SOP geometry. Points and primitives (polygons, NURBS, etc.) can have any number of attributes - position (P) is standard, and built-in optional attributes are normals (N), texture coordinates (uv), color (Cd), etc.

An Operator Family that creates, composites and modifies images, and reads/writes images and movies to/from files and the network. TOPs run on the graphics card's GPU.

Operators that need 1 or more inputs are called Filters in TouchDesigner, like a Math CHOP. See Generator.

An Operator Family which operate on Channels (a sequence of numbers (Samples)) which are used for animation, audio, mathematics, simulation, logic, UI construction, and data streamed from/to devices and protocols.

An operator whose Bypass flag is set does nothing: All data going into its first input appears at its output unaffected.

A Link. The grey dashed lines between nodes is a Reference or Link that indicates one operator is getting data from another operator from any Operator Family.

The grey dashed lines between nodes is a Reference (or Link). A Reference is (1) a Parameter Reference, a parameter in an OP that is a name or path to another operator, (2) a Node Reference, an expression in a parameter or DAT script that contains the name or path of another operator, (3) a DAT Cell Reference or (4) a CHOP Channel Reference.

A Link or Reference is a dashed line between nodes that represent other data flowing between nodes. Examples are CHOP Exports, node Paths in parameters, and expressions in parameters referencing CHOP channels, DAT tables and other nodes. In contrast is a Wire that connects nodes in the same Operator Family.

A parameter reference can be setup between any two parameters by putting an expression in one parameter that refers to another parameter. This creates a Link between the two parameters such that when one changes, the other will change automatically (known in other software as a "constraint").