OpenGL Transform Feedback not returning anything
I am working on a Project to create Geometry by using a Geometry Shader and Transform Feedback.I am currently trying to have the Geometry Shader return its input (1 triangle) without changing/adding...
View ArticleTransformFeedback with instanced drawing
How does WebGL write data to a transform-feedback output when doing instanced drawing? Particularly, how does it decide on what index of the transform-feedback-buffer to write to when using instanced...
View ArticleOpenGl transform feedback with GL_SEPARATE_ATTRIBS buffer mode
I use OpenGl's transform feedback (version 3 to remain compatible with macos) to generate vertices from other vertices. In this scenario for example, the generated vertices are at least twice as...
View ArticleOpenGL Transform Feedback not returning anything
I am working on a Project to create Geometry by using a Geometry Shader and Transform Feedback.I am currently trying to have the Geometry Shader return its input (1 triangle) without changing/adding...
View ArticleglMapBufferRange() returns all zeros in Android OpenGLES 3.0 using...
UPDATE: This is working and up on gist now! Thanks RetoI am working on an Android implementation of transform feedback following this example. runs pretty well without any errors, but I am getting all...
View ArticleTransform feedback vertices always match order of input buffer
After reading Jason Ekstrand's blog on adding the transform feedback extension to Vulkan, he points out that the primitives in the transform feedback buffer aren't guaranteed to reflect the order and...
View ArticleWhen is binding transform feedback object not required?
I have some sample code for a transform buffer object I've been trying to simplify down to the most minimal form and I've found that my code works the same if I omit createTransformFeedback() and...
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Animate vertex positions with webgl2 transform feedback using two programs
I try to follow example from webgl2fundamentals regarding transform feedback.My goal is to create animation of vertex positions in a way that there are two programs:doing animation calculations each...
View ArticleTransform feedback with tesselation under Python/ModernGL
I'm using Python/ModernGL, I'm trying to capture an output from a tessellation evaluation shader by making a vao.transform call. I have no problems if I set my output in a vertex shader or a geometry...
View ArticleOpenGL ES3 transfrom feedback messed with more than one output
A simple particle system with transform feedback.When only one output variable: "vPos" in glTransformFeedbackVaryings, it works correctly. But after adding another one: "vVel", the transform feedback...
View ArticleglTransformFeedbackVaryings with out interface block [duplicate]
I'm trying to link a GLSL program that uses transform feedback, with vertex shader + geometry shader. The program gives a link error because it can't find one of the variables specified in...
View ArticleCan't wait on a fence
I'm trying to get some data from TRANSFORM_FEEDBACK_BUFFER with the code below:const transform_feedback = gl.createTransformFeedback();gl.bindTransformFeedback(gl.TRANSFORM_FEEDBACK,...
View ArticleWorking with two buffers with Transform Feedback
I'm trying to retrieve two varying variables pos_x and pos_y and store their values into output_data_x and output_data_y. I'm very new to webgl and I'm having some problems finding tutorials about...
View ArticleWhy glBeginTransformFeedback requires to specify the primitive type?
I was trying to think why would OpenGL need to know the primitive type when calling glBeginTransformFeedback. In essence, it's just data that is stored into a buffer.My guess would be that OpenGL...
View ArticleFetch specific pixels in the image from GPU to CPU using some technique like...
I am working on an iOS OpenGLES 3.0 image filter app which need to read the pixel data from a texture, then loop through entire pixels, extract some pixels with some conditions like brightness over a...
View ArticleglMapBufferRange returns null and produces a GL_INVALID_ENUM?
OpenGL ES 3.0 here. I am trying to read back the contents of a TRANSFORM_FEEDBACK buffer like this:GLES30.glBindBufferBase(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0, tfo );GLES30.glBeginTransformFeedback(...
View ArticleVertices indexing in geometry shader & SSBO performance
I'm constructing a shader program & GL host environment that would do a relatively simple task:Run VS -> TCS -> TES -> GS set of shader stages on a number oftriangles (patches). TES/TCS do...
View ArticleWebgl2 -- Transformfeedback vs. dumping to CPU. Which is faster for...
For a physics particle system simulation, I'm wanting to optimize a WebGL2 program. I want to know if it is faster to adjust vertice positions using a transformfeedback accessing a 3D-texture, setting...
View ArticleQt OpenGL transform feedback buffer functions missing
I've been following a tutorial series for learning OpenGL, and the current tutorial I'm trying to do involves creating particle systems using the OpenGL transform feedback buffer. In my application...
View ArticleOpengl: Can we calculate how much percentage of object is shadowed by other...
We are making a simulation of city with lot of buildings. We have requirement to calculate how much percentage of building surface is of directly illuminated by sunlight(direct-light). Is there any...
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