Opengl es uniform array

Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I thought about making a string replacement in the shader source before compiling it, but than I have to compile it everytime I draw a different element.

That seems to be CPU-intensive. The typical approach would be to size the uniform array to the maximum number of elements you expect to use, and then only update the subset of it that you're actually using.

You can then pass in the effective size of the array as a separate uniform. Learn more. Asked 3 years, 11 months ago. Active 3 years, 11 months ago. Viewed times. I can declare an array with fixed size: uniform vec2 vertexPositions[4]; But now I want to set the size dynamic to the number of points, which I will pass. Improve this question. Nicol Bolas k 48 48 gold badges silver badges bronze badges.

opengl es uniform array

Lisa Aaabbb Lisa Aaabbb 45 6 6 bronze badges. Active Oldest Votes. Improve this answer. Orin Tresnjak Orin Tresnjak 2 2 silver badges 7 7 bronze badges.

I aslo thought about this solution, but I thought it might be too storage-hungry? Right, you're going to need the maximum amount of storage either way--you don't save anything by only using it for part of the frame.

How to pass uniform array of struct to shader via C++ code

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Owning the code, from integration to delivery. Building momentum in our transition to a product led SaaS company. Featured on Meta. Opt-in alpha test for a new Stacks editor.Say you have a scene where you're drawing a lot of models where most of these models contain the same set of vertex data, but with different world transformations.

Think of a scene filled with grass leaves: each grass leave is a small model that consists of only a few triangles.

opengl es uniform array

You'll probably want to draw quite a few of them and your scene may end up with thousands or maybe tens of thousands of grass leaves that you need to render each frame. Because each leaf is only a few triangles, the leaf is rendered almost instantly. However, the thousands of render calls you'll have to make will drastically reduce performance.

If we were to actually render such a large amount of objects it will look a bit like this in code:. When drawing many instances of your model like this you'll quickly reach a performance bottleneck because of the many draw calls. Compared to rendering the actual vertices, telling the GPU to render your vertex data with functions like glDrawArrays or glDrawElements eats up quite some performance since OpenGL must make necessary preparations before it can draw your vertex data like telling the GPU which buffer to read data from, where to find vertex attributes and all this over the relatively slow CPU to GPU bus.

So even though rendering your vertices is super fast, giving your GPU the commands to render them isn't. It would be much more convenient if we could send data over to the GPU once, and then tell OpenGL to draw multiple objects using this data with a single drawing call. Enter instancing.

These instanced versions of the classic rendering functions take an extra parameter called the instance count that sets the number of instances we want to render.

opengl es uniform array

We sent all the required data to the GPU once, and then tell the GPU how it should draw all these instances with a single call. By itself this function is a bit useless.

Rendering the same object a thousand times is of no use to us since each of the rendered objects is rendered exactly the same and thus also at the same location; we would only see one object! Having a unique value per instance means we could now for example index into a large array of position values to position each instance at a different location in the world.

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To get a feel for instanced drawing we're going to demonstrate a simple example that renders a hundred 2D quads in normalized device coordinates with just one render call. We accomplish this by uniquely positioning each instanced quad by indexing a uniform array of offset vectors. The result is a neatly organized grid of quads that fill the entire window:. Each quad consists of 2 triangles with a total of 6 vertices.

Each vertex contains a 2D NDC position vector and a color vector. Below is the vertex data used for this example - the triangles are small enough to properly fit the screen when there's a of them:. The quads are colored in the fragment shader that receives a color vector from the vertex shader and sets it as its output:.It is designed for embedded systems like smartphonestablet computersvideo game consoles and PDAs.

The API is cross-language and multi-platform. Vulkana next-generation API from Khronos, is made for simpler high performance drivers for mobile and desktop devices. OpenGL ES 1. Version 1. Other significant differences are that the calling semantics for primitive rendering functions were changed in favor of vertex arrays, and fixed-point data types were introduced for vertex coordinates.

Attributes were also added to better support the computational abilities of embedded processors, which often lack a floating point unit FPU. Many other functions and rendering primitives were removed in version 1. Actual version is 1. OpenGL ES 2. OpenGL 4. Version 3. OpenGL ES 3.

Actual Version is 3. Actual State is 3. Next generation API is Vulkan. For complete list of companies and their conformant products, view here. Supported by some recent versions of these GPUs: [41] [42]. Supported by Windows, Linux, Android since version 5. This allows applications to use all of the features of the set of extensions, while only testing for the presence of a single one. Both make use of similar features from the AEP.

Supported by Windows, Linux, Android since version 6. There is currently no plan for a new core version of OpenGL ES, as adoption of Vulkan has been deemed to displace it in embedded and mobile applications.

From Wikipedia, the free encyclopedia. This section needs expansion. You can help by adding to it. September Khronos Group. Ziff Davis. Stack Overflow. Archived from the original on Retrieved July 25, November 2, Research in Motion.Tag: openglopengl-esshader. You will need to get the location of each field of the struct for each array element and send the value separately.

Much of this must have been explained before, but let me try and give an overview that will hopefully make it clearer how all the different pieces fit together. I'll start by explaining each piece separately, and then explain how they are connected. Texture Target This refers to the different In the way you describe that checking if each polygon is within FOVit will almost always be slower - GPU can do it faster.

But this idea can be improved by organizing the polygons in some clever data structure, which can quickly cut out large numbers of polygons that The constructors also expect elements to be specified in the same order.

Your texture is a height map. Not a normal map. You have two options: Replace the height map with a normal map they are usually blueish. Or calculate the normal from the height map. UV, ivec2 -1, 0. You have several options here, the most desirable depends on your situation. Some possibilities: Write a shader, which doesn't sample the texture, and use that until your texture is streamed in and ready.

Create a 'blank' texture, and bind it to the appropriate slot until you create the real texture Changing it to the former solved the problem. You should create vector of direction. Every time you move your mouse, you should reevaluate it according to angle.

Directional vector should be vector on unit circle. This is intended.Specifies the maximum number of characters OpenGL is allowed to write in the character buffer indicated by name. Returns the number of characters actually written by OpenGL in the string indicated by name excluding the null terminator if a value other than NULL is passed.

A value of zero for index selects the first active uniform variable. Permissible values for index range from zero to the number of active uniform variables minus one. Shaders may use either built-in uniform variables, user-defined uniform variables, or both. User-defined uniform variables have arbitrary names and obtain their values from the application through calls to glUniform. A uniform variable either built-in or user-defined is considered active if it is determined during the link operation that it may be accessed during program execution.

Therefore, program should have previously been the target of a call to glLinkProgrambut it is not necessary for it to have been linked successfully. This value should be used to allocate a buffer of sufficient size to store the returned uniform variable name.

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The size of this character buffer is passed in bufSizeand a pointer to this character buffer is passed in name. The string returned will be null terminated.

The actual number of characters written into this buffer is returned in lengthand this count does not include the null termination character.

If the length of the returned string is not required, a value of NULL can be passed in the length argument. The type argument will return a pointer to the uniform variable's data type. The symbolic constants returned for uniform types are shown in the table below. Only one active uniform variable will be reported for a uniform array. If the active uniform is an array, the uniform name returned in name will always be the name of the uniform array appended with "[0]".

Uniform variables that are declared as structures or arrays of structures will not be returned directly by this function. Instead, each of these uniform variables will be reduced to its fundamental components containing the ".

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Each of these reduced uniform variables is counted as one active uniform variable and is assigned an index. A valid name cannot be a structure, an array of structures, or a subcomponent of a vector or matrix. The size of the uniform variable will be returned in size. Uniform variables other than arrays will have a size of 1.

Structures and arrays of structures will be reduced as described earlier, such that each of the names returned will be a data type in the earlier list. If this reduction results in an array, the size returned will be as described for uniform arrays; otherwise, the size returned will be 1.

This function will return as much information as it can about the specified active uniform variable. If no information is available, length will be 0, and name will be an empty string. This situation could occur if this function is called after a link operation that failed.

If an error occurs, the return values lengthsizetypeand name will be unmodified. Light Dark. OpenGL 2. Name glGetActiveUniform — Returns information about an active uniform variable for the specified program object. Parameters program Specifies the program object to be queried.

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Description glGetActiveUniform returns information about an active uniform variable in the program object specified by program. Think you can improve this page? Edit this page on GitHub. Each entry is under individual copyright displayed at the bottom of that entry.A uniform is a global Shader variable declared with the "uniform" storage qualifier. These act as parameters that the user of a shader program can pass to that program.

Their values are stored in a program object. Uniforms are so named because they do not change from one shader invocation to the next within a particular rendering call thus their value is uniform among all invocations. This makes them unlike shader stage inputs and outputs, which are often different for each invocation of a shader stage. Uniforms can be of any type, or any aggregation of types. The following are all legal GLSL code:. Uniforms are implicitly constant, within the shader though they are not Constant Expressions.

Attempting to change them with shader code will result in a compiler error. Similarly, you cannot pass a uniform as an out or inout parameter to a function. Uniforms are intended to be set by the user from OpenGL, rather than within the shader. However, you can initialize them to a default value using standard GLSL initalizer syntax :.

Uniforms defined outside of Interface Blocks have a location. This location can be directly assigned in the shader, using this syntax:. It is illegal to assign the same uniform location to two uniforms in the same shader or the same program. Even if those two uniforms have the same name and type, and are defined in different shader stages, it is not legal to explicitly assign them the same uniform location; a linker error will occur. Arrays and structs will be assigned sequentially increasing locations, starting with the given location.

Given this:. This will apply for nested types. Consider the following:. As such, you can upload an array of vec4 s to this array with glUniform4fv 2, 3, If two uniforms in a program are given the same explicit location, then they refer to the same uniform. This means they must also match in variable name, type, array-index, qualifiers, etc.

The following would be illegal:. But it wouldn't have the same name, or same type, or other characteristics. GLSL compilers and linkers try to be as efficient as possible.

Therefore, they do their best to eliminate code that does not affect the stage outputs. Because of this, a uniform defined in a shader file does not have to be made available in the linked program. It is only available if that uniform is used by code that affects the stage output, and that the uniform itself can change the output of the stage. Therefore, a uniform that is exposed by a fully linked program is called an "active" uniform; any other uniform specified by the original shaders is inactive.

Inactive uniforms cannot be used to do anything in a program. The number of active uniforms available is bound by a set of limits. Each shader stage has a limit on the number of available uniforms. You can query these limits with glGetIntegervbut they are all quite generous—at least in OpenGL 3.

The limit refers to the quantity of space for individual floats, integers, or booleans.

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A vec3 is expected to take up 3 components. Thus, a mat2x3 will not take up any more than 8 components and may take up less. Double-precision values from GL 4.I would like to say that Thordis was particularly helpful when I experienced difficulties after being caught in a snow blizzard and became trapped in my vehicle. The back up service an support was excellent and helped me greatly during a difficult time.

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opengl es uniform array

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