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Questions tagged [hlsl]

HLSL(High Level Shader Language) is a proprietary shading language developed by Microsoft for use with the Microsoft Direct3D API

HLSL is a C-like language developed by Microsoft and it's used in Direct3D API to define shaders. HLSL is used by Direct3D 9, and is required by the unified shader model in Direct3D 10+.

HLSL can be used to define pixel shaders, vertex shaders, geometry shaders, compute shaders, tessellation shaders, raytracing shaders and mesh shaders. It is analogous to for OpenGL.

Vulkan SDK and DirectX Shader Compiler also supports compiling HLSL shaders into SPIR-V, enabling its use in Vulkan applications.

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Do conditional statements slow down shaders?

I want to know if "if-statements" inside shaders (vertex / fragment / pixel...) are really slowing down the shader performance. For example: Is it better to use this: vec3 output; output = input*enable + input2*(1-enable); instead of using…
Thomas
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When does the transition from clip space to screen coordinates happen?

I was studying the rendering pipeline and when I got to the clipping stage it was explained that from the view (eye or camera) space we have to pass to the clip space, also called normalized device space (NDC), that is a cubic space from -1 to 1.…
StrG30
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Normalizing from [0.5 - 1] to [0 - 1]

I'm kind of stuck here, I guess it's a bit of a brain teaser. If I have numbers in the range between 0.5 to 1 how can I normalize it to be between 0 to 1? Thanks for any help, maybe I'm just a bit slow since I've been working for the past 24 hours…
meds
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Why does HLSL have semantics?

In HLSL I must use semantics to pass info from a vertex shader to a fragment shader. In GLSL no semantics are needed. What is an objective benefit of semantics? Example: GLSL vertex shader varying vec4 foo varying vec4 bar; void main() { ... …
gman
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Glsl mod vs Hlsl fmod

I've implemented the spiral GLSL shader described in this question in HLSL, but the results are not the same. I think it's because of the mod function in GLSL that I've translated to fmod in HLSL. I suspect that this problem only happens when we…
Ivo Leitão
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How do I calculate pixel shader depth to render a circle drawn on a point sprite as a sphere that will intersect with other objects?

I am writing a shader to render spheres on point sprites, by drawing shaded circles, and need to write a depth component as well as colour in order that spheres near each other will intersect correctly. I am using code similar to that written by…
David
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FXC : error X3501: 'main': entrypoint not found

I am following an example book called: Introduction to 3D Game Programming with DirectX 11 It is all written in VS2010. I would like to try using VS2013... It is an example project for Windows Desktop Program I have a program with the following in…
Jimmyt1988
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How much performance do conditionals and unused samplers/textures add to SM2/3 pixel shaders?

We've one pixel shader in HLSL which is used for slightly different things in a few places, and as such has several conditional blocks meaning that complex functionality is omitted in some cases. As well, this means we pass textures as sampler…
Mr. Boy
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VS2010 - HLSL Intellisense?

Are there any free components out there that will give highlighting and/or intellisense for HLSL? I've seen mentions of something called "InteliSense.Net," but the author's site is down and I can't find a download anywhere.
3Dave
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HLSL for loop with Shader Model 2.0: Error X3511 unable to unroll loop

When compiling the following for loop in my HLSL shader under Shader Model 2.0, I'm getting Error X3511. for (int x = -5; x <= 5; x++) { for (int y = -5; y <= 5; y++) { ... The error reads as follows: unable to unroll loop, loop…
barnacleboy
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Some simple XNA/HLSL questions

I've been getting into HLSL programming lately and I'm very curious as to HOW some of the things I'm doing actually work. For example, I've got this very simple shader here that shades any teal colored pixels to a red-ish color. sampler2D…
inline
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pow(0, 2.2) gives 1 in a hlsl pixel shader?

But pow(0, 2.0) gives 0 Seems that any float exponent gives 1 while integer exponents give 0. I am using DirectX 9 and hlsl compiler "D3DCompiler_43.dll". Confirmed that on Nvidia and Ati cards. I am confused! Is that some kind of known behaviour or…
Ole Dittmann
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Shader's function parameters performance

I'm trying to understand how passing parameters is implemented in shader languages. I've read several articles and documentation, but still I have some doubts. In particular I'm trying to understand the differences with a C++ function call, with a…
Heisenbug
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How to implement SLERP in GLSL/HLSL

I'm attempting to SLERP from GLSL (HLSL would also be okay as I'm targeting Unity3D) I've found this page: http://www.geeks3d.com/20140205/glsl-simple-morph-target-animation-opengl-glslhacker-demo It contains the following listing: #version 150 in…
P i
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Should I avoid creating multiple variables when programming a shader?

I'm starting to learn Shaders now (HLSL, GLSL) and I saw a lot of tutorials where there weren't many variables created and that made reading harder. I was wondering if the creation of new variables affect the performance of the shader. So, for…
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