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EX9.HLSL.Introduction

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Semantics

todo

Vectors and Swizzling

Apart from the simple datatypes like bool, int, float and double with HLSL you can use all those as vectors also, by simply writing something like:

float4 ff = {4, 3, 2, 1};
bool2 bb = {1, 0};

Now you can reach the individual vector components using swizzles, which work as suffixes to the variable names:

 .x, .y, .z, .w 

are the same as:

 .r, .g, .b, .a
float f = ff.a;     // f = 1
bool b = bb.y;      // b = 0
float2 f2 = ff.xz   // f2 = {4, 2}

Arrays

With all the basic datatypes you can also declare arrays, but note that their length is limited, depending on the constant register count of the shader profile used. You can find out about the number of allowed constants on msdn:
vs_2_0 registers
ps_2_0 registers
vs_3_0 registers
ps_3_0 registers

You can define and access arrays like the following example demonstrates:

float4 ff[2] = {{0, 1, 2, 3}, {4, 5, 6, 7}}
float4 f1 = f[0];        //f1 = {0, 1, 2, 3}
float3 f2 = f[1].rgb;    //f2 = {4, 5, 6}

Intrinsic Functions

HLSL has a small list of built-in functions. A rightclick in vvvvs shader editor pops up the list.

Functions and Includes

Besides the main vertex- and pixelshader functions you can define any number of helper functions in an effect file. If this gets too confusing functions can be outsourced into an extra textfile and linked to from any effect via the # include directive which offers 2 different usages:

//local: the referenced file is placed in the same directory as the .fx file which includes it
#include "myfunctions.fxh" 
 
//global: the filename is specified relative to vvvvs root directory
#include <effects\myfunctions.fxh>

Shader Profiles

In every technique you have to specify a shader profile with which you want the vertex- and pixelshader functions compiled. Generally speaking, the higher the profile number the more flexible it is. If your shader shows an error regarding that you are out of instructions with the currently set profile you may try one with a higher number.

Details about shader profiles and corresponding features can be found on msdn: Shader Models vs. Shader Profiles

Depending on the capabilities of your graphic card, vvvv supports the following profiles:

  • vs_1_0, ps_1_0
  • vs_1_1, ps_1_1
  • vs_2_0, ps_2_0
  • vs_2_a, ps_2_a
  • vs_2_b, ps_2_b
  • vs_3_0, ps_3_0 //note that when using vs_3_0 using ps_3_0 is mandatory in vvvv

anonymous user login

Shoutbox

~13h ago

joreg: absolutely. if it is for a repo that is public, just submit a pullrequest. otherwise please start a forum thread.

~13h ago

benjawmino: @joreg I ended up figuring out BezierSegment yesterday, so nevermind! Tell me, could a user submit a help patch? :)

~13h ago

joreg: @benjawmino please elaborate on this question a bit in a new forum thread. otherwise it is hard to answer..

~2d ago

benjawmino: so are there no splines/curves in gamma yet??

~5d ago

skyliner: wanna do drone shows or applications? then check this super cool project of our man e1n

~10d ago

NoseBleedIndustries: Thanks Joreg! The few minutes I was able to see, very good workshops!

~10d ago

joreg: @NoseBleedIndustries please give us some days, we'll have an announcement soon...

~10d ago

NoseBleedIndustries: I could not assist the Node20 (workshops ) Any Idea when we will have access to the links of the recordings?

~11d ago

bjoern: unity has c# bindings for usd, under apache license: https://github.com/Unity-Technologies/usd-unity-sdk