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

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2answers
865 views

Which are the most futureproof languages for graphics (shader) programming?

I have written some GLSL and Cg shaders a couple years back. I am starting another graphics engine project and I want to choose my technologies carefully so that my code will be accessible years down ...
5
votes
1answer
339 views

Calculated normals for mesh not working

I am trying to implement a 3D mesh viewer with C++ and OpenGL ES 2. I am currently struggling with the calculation of the normals for the vertices, or at least I think that is where the problem ...
5
votes
2answers
2k views

How to implement color changing fragment shader?

I have a background of a given size and filled with a given color. I want to change it with an animation effect, starting from the center and spread out until it extends the whole background. The new ...
5
votes
1answer
644 views

HLSL Circle all white

I have been trying to get my shader code (HLSL) to draw a simple circle but after a day and a half I am getting nowhere. It seems people are using the x^2 + y^2 = r^2 and remap texcoords but I only ...
5
votes
2answers
2k views

Should the modelview and projection matrices be calculated in the shader or on the CPU?

At minimum I would have a camera with rotation and world position; projections parameters such as angle of view and perspective vs. orthographic; and meshes with scale, angle, and world position. ...
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3answers
1k views

Vertex Shader Fundamental Workings

I understand that water ripples (e.g. stone thrown into a pond) are often handled with vertex shaders. My first question is: are the ripples nothing more than an algorithm that is the function of ...
5
votes
2answers
2k views

What range of values can HLSL's tex2D function return?

When using the tex2d function in a HLSL shader, as so: float height = tex2D(heightMap, IN.texCoord).r; What range of values can be returned to the height variable? Is it always a number between ...
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votes
3answers
2k views

ConsumeStructuredBuffer, what am I doing wrong?

I'm trying to implement the 3rd exercise in chapter 12 of Introduction to 3D Game Programming with DirectX 11, that is: Implement a Compute Shader to calculate the length of 64 vectors. Previous ...
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2answers
1k views

Geometry shader for multiple primitives

How can I create a geometry shader that can handle multiple primitives? For example when creating a geometry shader for triangles, I define a layout like so: layout(triangles) in; ...
5
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1answer
788 views

GLSL shader without a vertex array

Ok so I have a idea for a neat GPU driven curve renderer, and I realised that the vertex shader can be hardwired to generate points of the curve segment (to be rendered as a line strip) without ...
5
votes
1answer
970 views

unity 5 how to get a shadowmap

I'm writing a custom shader in unity 5 that requires a shadowmap (not just for drawing shadows but also for different computations involving scattering particles through fog). Does anybody know how to ...
5
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2answers
240 views

Should I use different input layout for meshes (vertices) with and without normal maps?

I'm writing an DirectX11 game. About 60% of my game models (or "of my vertices") have: Position Texture coordinate Some of them use: Position Texture coordinate Normals And few of them: ...
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1answer
963 views

Spherical fractal noise generator in shader

I have a growing sphere in space, and I thought of having a procedural generated texture over it. Since it is growing, I thought a fractal would be a great choice, because more details would be ...
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votes
1answer
89 views

How can shader code duplication be reduced in Unity?

In our current Unity project we have a few shaders that are basically just supersets of another shader. For example, we have a shader that performs lighting calculates with diffuse, normal, specular, ...
5
votes
1answer
653 views

Spritebatch Vertex shader world matrix change after each draw

I have a spritebatch where I draw some textures transformed in 3d space. The easy way was just Begin with the transformation matrix, draw, and end it right after. But that is silly, so I'm trying ...
5
votes
1answer
739 views

Multipass shaders and switching between passes

As mentioned here Effects should be avoided in DX11. If I understand correctly, that includes techniques and passes defined in *.FX files. So when doing a multipass shader (like the always-mentioned ...
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votes
1answer
557 views

Dealing with alpha for 2D per pixel lighting

Right now I've got a simple light shader. Every bitmap I draw goes through it to make up the scene. I only draw quads. texture tex; sampler2D s = sampler_state { texture = <tex>; ...
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1answer
3k views

GLSL Editor and Debugger for MacOSX with ES2 support

is there a GLSL editor for the mac? I need it for iOS OpenGLES2 shader. How do you best debug shader? Regards
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3answers
917 views

Can anyone recommend a 3D model viewer with shading? [closed]

I am looking for a simple real-time OpenGL based render engine to show a 3D model on screen. I prefer using 3DS Max's 'shader' materials (real-time materials) for editing. Do you know any good ...
5
votes
4answers
1k views

From camera coordinates to world coordinates

I want to calculate world coordinates from camera coordinates. However, I seem to have problems with my understandings of how matrices in HLSL work. From world to camera is clear: cameraPosition = ...
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votes
2answers
2k views

OpenGL equivalent of .fx files in GLSL or Cg?

There's a lot of learning material in the DirectX world that uses .fx files to manage shaders, and .fx seems to be well integrated with 3D packages such as Maya and 3D Studio Max What do larger ...
5
votes
3answers
2k views

How do I send multiple matrices to a vertex shader?

I'm practising animations using bones/skinning. I am trying to send the shader one matrix per vertex. I can think of these two approaches. Method 1 I have one uniform handle for each bone matrix ...
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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 ...
5
votes
3answers
1k views

Multiple render targets and gamma correctness in Direct3D9

Let's say in a deferred renderer when building your G-Buffer you're going to render texture color, normals, depth and whatever else to your multiple render targets at once. Now if you want to have a ...
5
votes
1answer
330 views

How can I test shaders for nVidia on an ATi system?

I and our other devs have ATi graphics cards. However we have encountered that some shaders that compile without warnings on ATi don't compile at all on nVidia. The problems are trivial to fix, but ...
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votes
2answers
2k views

Does Unity's “Transparent Bumped Specular” translate to “semi-shiny must be semi-transparent”?

Unity's documentation for the "Transparent Bumped Specular" shader/material-type is simply a concatenation of each of the descriptions for its Transparent and Specular Shaders (and also Bumped, but ...
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votes
3answers
3k 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
9k views

How do I pass vertex and color positions to OpenGL shaders?

I've been trying to get this to work for the past two days, telling myself I wouldn't ask for help. I think you can see where that got me... I thought I'd try my hand at a little OpenGL, because ...
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votes
2answers
854 views

Optimising the modelview transformation in GLSL for 2D

So, the standard way to transform vertices and then pass to the fragment shader in GLSL is something like this: uniform mat4 u_modelview; attribute vec4 a_position; void main() { gl_Position = ...
4
votes
1answer
710 views

Rendering different materials in a voxel terrain

Each voxel datapoint in my terrain model is made up of two properties: density and material type. Each is stored as an unsigned integer value (but the density is interpreted as a decimal value ...
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votes
2answers
7k views

Basics of drawing in 2d with OpenGL 3 shaders

I am new to OpenGL 3 and graphics programming, and want to create some basic 2d graphics. I have the following scenario of how I might go about drawing a basic (but general) 2d rectangle. I'm not ...
4
votes
2answers
287 views

Shadowmap first phase and shaders

I am using OpenGL 3.3 and am tryin to implement shadow mapping using cube maps. I have a framebuffer with a depth attachment and a cube map texture. My question is how to design the shaders for the ...
4
votes
1answer
3k views

Access vertex data stored in VBO in the shader

If I wanted to store extra data in a VBO for skinning (indices for indexing into an array of matrices of bones and floats for applying weights to those bones) How would I go about accessing that data ...
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2answers
567 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 ...
4
votes
1answer
986 views

Shader effect similar to Metro 2033 gasmask

I was thinking about effects in games the other day and I was reminded of the Gasmask effect from Metro 2033. Once you put the gasmask on it blurred a bit in the corners and could ice up and even get ...
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
1k 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 ...
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2answers
247 views

Discoordinated Chromatic Aberration Effect

The game Teleglitch heavily utilizes the CA effect with screen distortion. I am trying to achieve this effect. Issue 1. How to not apply the effect onto the floor? (solved) They render the screen ...
4
votes
1answer
2k views

Issue with interpolation on a burn shader (lerp and smoothstep)

I'm trying to create a simple burn shader. See here for more info on the method I'm using. However, I don't get why replacing the smoothstep with a lerp results in completely different results. Am I ...
4
votes
2answers
776 views

How can I use shaders to make a square have a waving effect?

I'm new to using shaders to do some fancy effects and I'm struggling with them. I'm using DirectX 11 and HLSL. I have this square in the middle of the screen: It's just a square that I've created ...
4
votes
1answer
1k views

variable number of lights in a glsl shader?

I want to render an arbitrary number of lights in my fragment shader. I do not understand how you can properly pass them into the shader though. For example, I want something like this: uniform int ...
4
votes
1answer
3k views

How to draw a Bezier line with shaders?

I found a shader code to draw filled Quadratic Bezier in http://http.developer.nvidia.com/GPUGems3/gpugems3_ch25.html How can use something similar to draw a Bezier line that follows the same path? ...
4
votes
1answer
1k views

Multiplication for MVP matrices: Any benefits to doing so within the vertex shader?

I'd like to understand under what circumstances (if any) it is worth doing MVP matrix multiplication inside a vertex shader. The vertex shader is run once per vertex, and a single mesh typically ...
4
votes
1answer
694 views

My GLSL shader isn't compiling even though it should. What should I investigate?

I'm porting an iOS game to Android. One of the shaders I'm using wouldn't compile until I reduced the number of uniform variables. Here are the uniform definitions: uniform highp mat4 ...
4
votes
1answer
756 views

Why are my texture coordinates always (0,0) in this shader?

What I'm trying to do is add my depth buffers values to my scene, ie. I'm trying to make objects closer to the camera darker and objects further away lighter. Which should be easy: just render the ...
4
votes
1answer
838 views

Using raw vertex information for sprites rather than SpriteBatch in XNA

I have been wondering whether using SpriteBatch is the best option. Obviously for prototyping or small games it works well. However, I've been wanting to apply techniques such as shaders and lighting ...
4
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3answers
4k views

How can I draw the depth value in GLSL?

I want to draw the depth buffer in the fragment shader, I do this: Vertex shader: varying vec4 position_; gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; position_ = ...
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votes
1answer
1k views

Shadow mapping does not work correctly using GLSL shaders

I'm a beginner in shadow mapping. I have in my scene two meshes : a cube and a floor. The scene is lighted by a single point light. Here's for the following display the light properties : ...
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1answer
557 views

Matcap and BRDF Shading

I just would like to know what's the difference between the Matcap shaders used in ZBrush for example and the Bidirectional Radiance Distribution Function shader. Are there two techniques the same ? ...
4
votes
1answer
808 views

How can I emulate point sprites in D3D11?

I have points which I pass to a vertex shader and then to a geometry shader, but now I want to get from the geometry shader a "bigger" point. So the point should get a "dadius" like it was possible in ...