a computer program that runs on graphics hardware and provides a high degree of control over how scenes are rendered

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4
votes
3answers
3k views

Loading and using an HLSL shader?

I've been looking everywhere and all I can find are tutorials on writing the shaders. None of them showed me how to incorporate them into my scene. So essentially: Given an hlsl shader, if I were to ...
4
votes
1answer
626 views

How can I handle the combination of multiple shader effects?

To be able to work efficiently with effects, is there a good way to combine multiple reusable "base" effects to achieve a more complex final result? For example, say I have an effect that handles ...
26
votes
4answers
4k views

What is a fragment?

What is a fragment in a fragment shader? Wikipedia says that: In general, a fragment can be thought of as the data needed to shade the pixel, plus the data needed to test whether the fragment ...
15
votes
2answers
4k views

How can I debug shader programs?

I'm in the process of debugging GLSL vertex shaders and I can't shake the feeling that I'm doing it wrong. In general I have two strategies to make up for the lack of tracing I stuff values into a ...
5
votes
2answers
1k views

Detect Mip mapping level in the shader?

Is there a way to do this in pixel shader 2.0/3.0? I've got on or off transparency so when the mipmapping level is different the transparency can take up too much of the texture and make it invisible....
4
votes
1answer
280 views

GLSL 2D Silhouette

I'm trying to render a silhouette of any entity behind foreground objects to indicate their position to the player. Here's an example of what I want to achieve, from Hyper Light Drifter: From what ...
4
votes
3answers
4k views

How can I make a shader effect that looks like a lightly shaded pencil drawing?

I want to make a shader effect using OpenGL ES 2.0 that looks like this image: I'm not sure if this image was painted or is the result of some filter, but I want to create a shader that produces ...
4
votes
1answer
2k views

Bitwise operators in DX9 ps_2_0 shader

I've got the following code in a shader: // v & y are both uints nPixel = v; nPixel << 8; nPixel |= y; and this gives me the following error in compilation: shader.fx(80,10): error X3535:...
3
votes
2answers
2k views

When is the Z coordinate normalized in GLSL?

I thought that whenever you transform an object to world space, then view space and finally screen space, the last matrix you apply(the projection matrix) normalizes the z values between 0 and 1. ...
2
votes
2answers
604 views

Palette reduction to pre-defined palette

I'm writing a bunch of GLSL effects for fun, but I can't wrap my head around this. Basically, I want to reduce a texture's palette into a pre-defined set of colors. For example, a post-processing ...
2
votes
1answer
192 views

Rendering lighting only on specific objects

I have done something similar to this in monogame: My question is, what would I have to do to draw that lighting effect only on the pillar and not the background ? Is there something like ...
2
votes
1answer
20k views

Unity3D draw call optimization : static batching VS manually draw mesh with MaterialPropertyBlock

I've read Unity3D draw call batching documentation. I understood it, and I want to use it (or something similar) in order to optimize my application. My situation is the following: I'm drawing ...
2
votes
1answer
967 views

Spherical procedural terrain shader based on slope

I've created a spherical terrain object out of 6 sphere projected (normalised) planes, each plane has been heightmapped post to being normalised. I'm looking to create a CG shader which will ...
2
votes
1answer
480 views

2D Hidden Object Silhouette Shader

Right now I am not using any depth information in my engine, but I just found out that it would be neat to be able to render the silhouette of important game objects that are "behind" something with a ...
2
votes
1answer
242 views

Disable depth testing for only some faces

I have some meshes and I need to be able to draw some part of them without depth test. Is it possible to turn off depth testing from within shader, wo that some parts will be rendered no matter what ...
1
vote
1answer
134 views

HLSL Shadowmap shader for large scale environments

I'm working on a racing game in Monogame. The game runs fine so far using Monogame's BasicEffect (link to video). I wanted to add shadows so I implemented a shadowmap using this as a base. and a ...
6
votes
1answer
3k views

gl_PointCoord always zero

I am trying to draw point sprites in OpenGL with a shader but gl_PointCoord is always zero. Here is my code Setup: //Shader creation..(includes glBindAttribLocation(program, ATTRIB_P, "p");) ...
4
votes
2answers
584 views

Programatically replace color gradient on sprite

Say I have the following image: I want to tint the yellow parts on this sprites shoulder/arms by a random color. In other questions on this site, they suggest using a chroma key and replacing the ...
3
votes
1answer
2k views

OpenGL ES Basic Fragment Shader help with transparency

I have just spent my first half hour playing with the shader language. I have modified the basic program I have which renders the texture, to allow me to colour the texture. varying vec2 texCoord; ...
3
votes
1answer
921 views

How'd they do it: TF2 payload cart glow?

How did the creators of TF2 make the glow on the payload cart visible through walls? Is it possible to implement this in Unity's shaderlab?
3
votes
1answer
202 views

How to blur entire scene but a specific spot in Unity?

What I want is basically: A way to blur every object/sprite on the scene, but have a "blur-free" circular zone, that can move. And everything that's behind that circular zone won't have the blur ...
3
votes
4answers
2k views

Multiplatform GLSL shader validator?

Im working on a multiplatform (Pc,Mac,Linux) game that uses shaders quite extensively. Since we do not have any funding, it is pretty hard to test our game on all possible hardware configurations. ...
2
votes
1answer
2k views

Drawing simple geometric figures with DrawUserPrimitives?

I'm trying to draw a simple triangle based on an array of vertex. I've been searching for a tutorial and I found a simple example on riemers but I couldn't get it to work. I think it was made for XNA ...
2
votes
2answers
3k views

How to implement Fog Of War with an shader?

Okay, I'm creating a RTS game and want to implement an AgeOfEmpires-like Fog Of War(FOW). That means a tile(or pixel) can be: 0% transparent (unexplored) 50% transparent black (explored but not in ...
2
votes
2answers
4k views

How do I create a sky box with OpenGL ES 2.0?

Can you give me hint to any good sky box example in OpenGL ES 2.0? I have found only OpenGL and does not work for me. I am doing it this way: Initialization: glUseProgram(m_programSkyBox.Program); ...
1
vote
3answers
2k views

Why Does unity_LightPosition[0] Seem to Depend on Camera Position?

I'm trying to write a fairly basic shader but I keep running into lighting issues with Unity. My first problem was trying to figure out which variable stored the light's position in world space. (I'...
1
vote
1answer
2k views

What kind of shader is this?

Cube World uses a pretty good looking shader, I especially like the shading of the characters: Is this soft shading? I'd like to achieve this effect in Unity 3D Free, but since the free version ...
1
vote
1answer
2k views

How to make 2D water like in this video?

I wanna make water and waves for my little 2D PC game like in this video: http://www.youtube.com/watch?v=ooU6cTeirlQ I don't know how to write a similar shader. Does anybody know how to write a ...
1
vote
1answer
151 views

How to mix effects together?

Lets say I have got terrain effect, contains multitexturing, light. Now water effect. It must be different, but must be also affected by light. Other one, player effect, must also be affected by light,...
1
vote
1answer
709 views

Monogame shader not working

I'm trying to use this this tutorial in monogame, but the effect does not work, only renders a black screen. Everyhing by itself renders just fine, I looked at the render targets if they get drawn to, ...
1
vote
2answers
603 views

How can I capture every frame in DirectX 9 using a shader

This is actually a follow up to this question How to capture the screen in DirectX 9 to a raw bitmap in memory without using D3DXSaveSurfaceToFile The proponent of the best solution suggested that I ...
1
vote
1answer
159 views

DX9 How to Apply HLSL Shader with StretchRect

Using DirectX 9,I'm trying to run a HLSL pixel shader on video frame data while copying it from one texture buffer to another texture buffer without displaying it. StretchRect at the end is what ...
0
votes
1answer
2k views

Direct3D11 and SharpDX - How to pass a model instance's world matrix as an input to a vertex shader

Using Direct3D11, I'm trying to pass a matrix into my vertex shader from the instance buffer that is associated with a given model's vertices and I can't seem to construct my InputLayout without ...
-1
votes
1answer
219 views

Create YUV texture for GL_TEXTURE_EXTERNAL_OES format

0 down vote favorite I need to create a yuv texture for GL_TEXTURE_EXTERNAL_OES format. source : https://github.com/crossle/MediaPlayerSurface/blob/master/src/me/crossle/demo/surfacetexture/...
-2
votes
1answer
481 views

Incorrect rotations using openGL GLM and shaders [closed]

The goal of my program is to display a simple colored triangle rotating on the Y axis without any translation. I'm using the GLM library. The problem is that the transformations of my triangle are not ...