Newest &#39;fragment-shader&#39; Questions

1

vote

1answer

75 views

DirectX11 pixel shader in pipeline is missing

I'm writing a program which displays a MS3D model using DirectX, and unfortunately, the result shows nothing on the screen. When I use the Graphics Debugger from Visual Studio 13, I notice that the ...

asked Jan 19 at 0:29

khanhhh89
385

1

vote

1answer

74 views

GLSL blur shader algorithm results in a lumpy blur?

I'm writing a Gaussian blur shader and it's coming along pretty well. However, when I run it on a circle, the result is lumpy. I'm using a simple nested for loop to create the blur. Here's the code ...

glsl fragment-shader

asked Jan 13 at 0:00

CharlesL
16618

0

votes

2answers

92 views

Is there a way to optimize this 2D lighting effect shader? [duplicate]

I'm doing a little 2D game in C++ with Direct3D 11. In the game I want to render a sort of shadow that covers part of the screen: To do this I am using this pixel shader: float4 PS_Main( PS_Input ...

directx optimization fragment-shader

asked Jan 3 at 11:34

Liuka
32

0

votes

1answer

51 views

Why would I lose the D3D device during an HLSL unroll?

I have a pixel shader that downsamples a texture from one size to another. The downsample shader uses a nested 'for' loop to traverse the uv coordinates. When the for loop executes more than four ...

c++ hlsl directx9 fragment-shader

asked Jan 2 at 22:06

P. Avery
806

0

votes

1answer

139 views

Shader which supports vertex colors and pixel lights?

From my question at Unity Answers: Hello everyone, I'm facing a bit of a problem here: I need a shader which has the ability to colour individual vertices and be lit pixel by pixel. Until recently, I ...

unity shaders fragment-shader cg

asked Dec 31 '13 at 19:12

Kroltan
1033

0

votes

1answer

105 views

problem using glm::lookAt and glm::perspective

I'm trying to change the code from the 22th tutorial at http://ogldev.atspace.co.uk/, using the GLM library, but the result seems wrong. The problem is shown in the below picture: While it should be: ...

opengl c++ shaders fragment-shader glm

asked Dec 14 '13 at 1:57

khanhhh89
385

0

votes

0answers

69 views

Can't understand the Schlick model formula

I'm trying to implement the Schlick shading model in the fragment shader. I took the formulas from Karsten Schwenk's "a survey of shading models for real-time rendering": First of all I don't ...

shaders fragment-shader

asked Dec 13 '13 at 14:00

Ramy Al Zuhouri
4419

0

votes

0answers

30 views

Strauss model : no specular component [duplicate]

I implemented the Strauss model with the metalness, transparency and smoothness parameters, taking the formulas from the book "Programming vertex geometry and pixel shaders", this is how I implemented ...

shaders glsl fragment-shader webgl

asked Dec 9 '13 at 16:04

Ramy Al Zuhouri
4419

1

vote

0answers

161 views

Two pass blur shader using libgdx tile map renderer

I am trying to apply the following technique: blur effect using two pass shader to my libgdx game using the OrthogonalTiledMapRenderer. The idea is to blur the background wich is also a tilemap but ...

libgdx tilemap fragment-shader blur

asked Dec 7 '13 at 16:32

Alexandre GUIDET
1635

1

vote

2answers

106 views

Ward model implementation: specular component too weak

I'm trying to implement the Ward shading model, the anisotropic, computationally efficient version: This is how I made it: float alphaX=0.5, alphaY=0.5; // asinotropic roughness float ...

glsl fragment-shader webgl

asked Dec 5 '13 at 16:38

Ramy Al Zuhouri
4419

0

votes

0answers

49 views

How can I compute spotlight attenuation when I only have a spotlight cutoff angle?

I am trying to compute the spot light attenuation, though I don't have a spotCosCutoff (cosine of the spotlight cutoff angle) predefined variable in the shader so I have to compute it myself. This is ...

shaders glsl fragment-shader webgl

asked Nov 26 '13 at 15:45

Ramy Al Zuhouri
4419

2

votes

2answers

46 views

Compiling 2 Dimensional Constant Arrays Right into Pixel Shader to use as Lookup Table

I want to use a small 2 dimensional look up table in a fragment shader, but I don't want to pay for the performance cost of fetching it from memory for every fragment. Is it feasible/reasonable to ...

fragment-shader

asked Nov 25 '13 at 21:22

Jim
1203

2

votes

0answers

117 views

Ashikhmin-Shirley model implementation: ugly result

I am trying to implement the Ashikhmin-Shirley model using these formulas: This is the GLSL 1.2 fragment shader code: uniform vec4 materialAmbient, materialDiffuse, materialSpecular; uniform ...

shaders glsl fragment-shader

asked Nov 25 '13 at 14:00

Ramy Al Zuhouri
4419

1

vote

2answers

148 views

What is the depth that a pixel shader may output? Is it necessary to write Depth?

In DirectX11, what does the depth that a Pixel Shader can output mean? Does a pixel shader need to output a depth so that we "write" the depth? If not, why would we output it? For any doubts, I'm ...

directx graphics directx11 fragment-shader sharpdx

asked Nov 19 '13 at 15:43

c4sh
236

2

votes

1answer

146 views

Multiple pixel shader passes

I currently have a pixel shader that calculates the texture and I have another that calculates the light. I want another shader that does both. What I would ideally like to do is instead of creating a ...

c++ directx shaders directx11 fragment-shader

asked Nov 18 '13 at 9:56

Caesar
1224

0

votes

3answers

127 views

directional lightning

I have managed to get a point light working, but I am facing problem with directional lightning. Fragment shader uniform vec4 lightColour ; uniform vec3 lightPos ; uniform float lightRadius ; ...

opengl game-design shaders fragment-shader

asked Nov 18 '13 at 9:55

meWantToLearn
1254

2

votes

2answers

132 views

How can I remove branches from a fragment shader function?

I have a fragment shader, when I've carefully managed to remove most branching decisions, as I have found out through research here that they are bad. But I have one function that I just can't work ...

shaders optimization fragment-shader

asked Nov 14 '13 at 20:23

user39022
133

0

votes

2answers

67 views

Alpha interpolation in a pixel shader

How does the interpolation in a fragment shader work when it comes to the alpha parameter? I'm programming a shader with SharpDX, DirectX11. My idea is to interpolate 2 3d points of a segment, so ...

directx shaders directx11 fragment-shader sharpdx

asked Nov 13 '13 at 13:23

c4sh
236

1

vote

1answer

75 views

How can I find a position between 4 vertices in a fragment shader?

I'm creating a shader with SharpDX (DirectX11 in C#) that takes a segment (2 points) from the output of a Vertex Shader and then passes them to a Geometry Shader, which converts this line into a ...

shaders directx11 geometry pixel-shader

asked Nov 12 '13 at 15:53

c4sh
236

3

votes

4answers

352 views

How many times fragment shader is executed?

I have an OpenGL code, with 3 different shader programs. I have a simple question, I know fragment shaders are executed for every every fragment in the scene. But is there a way using which we can ...

opengl glsl fragment-shader

asked Oct 25 '13 at 14:36

2am
526

1

vote

2answers

192 views

Computing pixel's screen position in a vertex shader: right or wrong?

I am building a deferred rendering engine and I have a question. The article I took the sample code from suggested computing screen position of the pixel as follows: VertexShaderFunction() { ... ...

hlsl vertex fragment-shader interpolation

asked Oct 22 '13 at 12:13

cubrman
1067

0

votes

1answer

86 views

Why i can not load a simple pixel shader effect (. fx) file in xna?

I just want to load a simple *.fx file into my project to make a (pixel shader) effect. But whenever I try to compile my project, I get the following error in visual studio Error List: Errors ...

xna shaders fragment-shader effects

asked Oct 17 '13 at 6:50

Mehdi Bugnard
253110

1

vote

1answer

196 views

Color grading, shaders and 3d textures

I'm trying to implement color correction with the 3d lookup table. The lookup table is actually just a 2d texture 256x16 and consists of 16 squares which one is 16x16. When it comes to rendering, I ...

directx hlsl graphics-programming fragment-shader

asked Sep 4 '13 at 14:58

Kirill Daybov
103

1

vote

0answers

65 views

How do I align textures properly with an exploding sprite / breakable body?

I'm working on a game based on Box2D and Starling which includes breakable bodies - bodies/objects that when hit with sufficient force break apart (into smaller pieces). I've managed the physics part ...

shaders actionscript-3 fragment-shader starling

asked Aug 18 '13 at 9:18

Iansen
1484

0

votes

1answer

153 views

Creating a fragment shader to darken a white texture over time - OpenGL GLSL

So as a part of learning OpenGL, I've now decided to try and be a bit more creative with shaders, as part of a practice game I'm making using C/OpenGL. I'm completely new when it comes to working ...

opengl shaders glsl c fragment-shader

asked Aug 13 '13 at 19:22

user1163640
1405

2

votes

3answers

424 views

OpenGL additive blending not working as expected

I am trying to achieve additive blending with point sprites. When the sprites overlap, all I get is solid red, when I expect to get a smooth blend from red->yellow->white. My sprite texture has all ...

opengl blending fragment-shader

asked Jul 31 '13 at 20:07

Seven Hundred and Forty-Two
570215

7

votes

2answers

2k views

GLSL Shader - Change Hue/Saturation/Brightness

I'm trying to change the hue of an image using a GLSL fragment shader. I want to achieve something similar to Photoshop's Hue/Saturation Adjustment layer. In the following image you can see what I've ...

opengl shaders glsl opengl-es2 fragment-shader

asked Jul 27 '13 at 6:13

mivic
19210

4

votes

1answer

454 views

using heightmap to simulate 3d in an isometric 2d game

I saw a video of an 2.5d engine that used heightmaps to do zbuffering. Is this hard to do? I have more or less no idea of Opengl(lwjgl) and that stuff. I could imagine, that you compare each pixel ...

opengl java fragment-shader depth-buffer 2.5d

asked Jul 17 '13 at 19:49

VaTTeRGeR
484

0

votes

1answer

65 views

Vertex and Fragment Shader worldNormal

How to access/calculate worldNormal in a Vertex and Fragment shader ? Thanks a lot !

opengl shaders glsl hlsl fragment-shader

asked Jul 10 '13 at 13:21

MaT
2817

9

votes

1answer

283 views

How do I implement 2D shadows cast between layers?

How could I implement 2d shadows that are cast by objects in a different layer? NOT like the dynamic lighting in the well known tutorial from Catalin Zima : But like the shadows of the pipes in ...

xna 2d fragment-shader shadows

asked Jul 5 '13 at 16:10

Berry
372510

0

votes

1answer

103 views

Per-fragment lighting system behaves like ambient lighting system

This is the relevant section of my fragment shader varying vec3 normal; varying vec3 halfv; ... vec4 color = ambient * gl_LightSource[0].ambient; vec3 n = normalize(normal); float ...

opengl shaders lighting fragment-shader per-pixel

asked Jul 4 '13 at 21:03

Seven Hundred and Forty-Two
570215

2

votes

0answers

81 views

Writing to a D3DFMT_R32F render target clamps to 1

I'm currently implementing a picking system. I render some objects in a frame buffer, which has a render target, which has the D3DFMT_R32F format. For each mesh, I set an integer constant ...

directx fragment-shader rendertargets frame-buffer

asked Jun 28 '13 at 9:37

Mike
1112

4

votes

1answer

162 views

Better solution for boolean mixing?

Sorry if this question has been asked in the past, but searching Google and here didn't yield relevant results, so here goes. I'm working on a fragment shader that implements both conditional/boolean ...

glsl fragment-shader

asked Jun 27 '13 at 19:51

Ruben Nunez
233

1

vote

1answer

627 views

Volumetric Fog Shader - Camera Issue

I am trying to build an infinite fog shader. This fog is applied on a 3D plane. For the moment I have a Z-Depth Fog. And I encounter some issues. As you can see in the screenshot, there are two views. ...

unity shaders glsl hlsl fragment-shader

asked Jun 15 '13 at 12:22

MaT
2817

1

vote

1answer

219 views

Fog shader camera problem

I have some difficulties with my vertex-fragment fog shader in Unity. I have a good visual result but the problem is that the gradient is based on the camera's position, it moves as the camera moves. ...

opengl unity directx shaders fragment-shader

asked Jun 14 '13 at 12:10

MaT
2817

1

vote

2answers

55 views

Defining lines from a heightmap

To a pixel shader of a 2D game, I'm passing a 1-row heightmap that holds the height in UV coordinates of evenly distributed points throughout the texture I'm drawing, but as for n points there will ...

xna hlsl fragment-shader heightmap

asked Jun 14 '13 at 5:14

V.M.
375

0

votes

2answers

984 views

cocos2dx - Custom Fragment Shader and CCRenderTexture

I have a CCRenderTexture that is filled with a sprite when the scene is loaded, as follows, canvas = CCRenderTexture::create(this->getContentSize().width, this->getContentSize().height); ...

cocos2d-x fragment-shader

asked Jun 13 '13 at 16:08

saiy2k
386110

2

votes

1answer

167 views

What is the interval of fragment-shader code execution?

Without any intended delay, is the code of a fragment-shader run once per frame? If not, how often will the code be executed? (I'm new to shaders: I'm talking about glsl if it makes any difference)

glsl performance fragment-shader

asked Jun 11 '13 at 14:08

Wipster
1284

3

votes

2answers

137 views

Opengl shader questions

I'm currently building a shader that takes a 2D texture sampler and uses UV coordinates to map it. This works fine for all textured objects. However, I'm having a bit of a problem as I'm trying to ...

opengl shaders fragment-shader

asked Jun 5 '13 at 13:52

Pedro Caetano
6314

2

votes

2answers

193 views

3D Distortion Effect

I'm trying to make a distortion effect similar to this: However I'm not making a 2d screen space effect. I'm applying it to a 3d scene and I want it to be placed IN the world, so it can be blocked ...

directx shaders hlsl graphic-effects fragment-shader

asked May 25 '13 at 1:39

Telanor
293113

7

votes

1answer

323 views

GL ES: Fragment shader optimization

Summary: I get FPS slowdown as soon as I try to tint the sprites (i.e: multiply texture with color in the fragment shader) Details: Hardware: iPod touch 4 I am drawing 700 sprites on the screen ...

performance opengl-es2 optimization frame-rate fragment-shader

asked May 23 '13 at 17:37

fakhir
1215

0

votes

1answer

76 views

Shader registers for different graphics card

The title is not very explicative, so i'll try to make myself clear. I have two "working"(on which i work on) PCs : a desktop that runs an NVIDIA GT440 an a laptop with a RADEON HD 4650. I have a ...

shaders hlsl fragment-shader pipeline

asked May 22 '13 at 10:24

Edoardo Tyger Dominici
411

2

votes

1answer

97 views

What is a Fragment Pipe?

I remember someone saying "24 fragment pipes on nVidia 7800" in a presentation. Am I correct in saying that a fragment is the data that can generate a pixel in the frame buffer? Or are fragments the ...

shaders fragment-shader

asked May 17 '13 at 4:02

sam
1132

7

votes

1answer

624 views

Optimizing performance of a heavy fragment shader

I need help optimizing the following set of shaders: Vertex: precision mediump float; uniform vec2 rubyTextureSize; attribute vec4 vPosition; attribute vec2 a_TexCoordinate; varying vec2 tc; ...

shaders opengl-es glsl opengl-es2 fragment-shader

asked May 14 '13 at 12:03

SirKnigget
1445

1

vote

1answer

64 views

I have a frag shader, one with an empty s_lightMap, how and why is it effecting the output?

I have an image of concrete rocks of different shades of colors, and I'm applying this shader, but without referencing s_lightMap's uniform in my program: precision mediump float; ...

shaders opengl-es2 fragment-shader

asked May 2 '13 at 14:45

mathacka
15411

0

votes

1answer

85 views

Weird rendering issue when applying lightmap through HLSL

I have a weird issue when trying to render the lightmaps in my game. Please see the following screenshots. Note how the scene looks up close with the lightmaps enabled. Note how that same part of ...

rendering hlsl fragment-shader sharpdx lightmap

asked Apr 29 '13 at 19:05

Lennard Fonteijn
1968

2

votes

2answers

338 views

Realtime fisheye to cubic or spherical panorama transformations with OpenGL or pixelshaders

I'd like to transform a sequence of circular fisheye-images to cubic or spherical panorama images to be used in a panorama-viewer based on OpenGL. The viewer-part is nemas problemas but the transform ...

opengl transformation fragment-shader skybox

asked Apr 29 '13 at 7:55

Andreas Zita
1134

1

vote

1answer

288 views

GL_EXT_shadow_samplers killing my shader

I have the following fragment shader for my scene #extension GL_EXT_shadow_samplers : require ... vec4 color = texture2D(uTextureUnit0, varTexCoord0); if (colorTransformEnabled != 0) { vec3 ...

shaders opengl-es2 shadow-mapping fragment-shader

asked Apr 25 '13 at 14:06

V1ru8
716

0

votes

1answer

101 views

How to alter the angle of texture projection

I'm currently working on a 3Dish game; it's on a grid, with 3D props and the camera looking down on the grid at about 45º, but I want to use 2D sprites for the player and NPCs. Currently, I'm using a ...

opengl glsl fragment-shader

asked Apr 14 '13 at 16:17

bonzairob
375

1

vote

1answer

831 views

How to do Triplanar Texturing

Ok maybe i'm missing something because its getting late and i've been programming now for about 72 hours straight (minus a nap or 2) ... I'm trying to write a shader for unity that will apply ...

unity shaders cg fragment-shader

asked Apr 7 '13 at 21:47

Wardy
332110

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