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Recent questions tagged opengl
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opengl es - Why is glReadPixels() failing in this code in iOS 6.0?
The following is code I use for reading an image from an OpenGL ES scene: -(UIImage *)getImage{ GLint width; ... Why is glReadPixels() failing on iOS 6.0? Question&Answers:os...
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opengl - Passing a list of values to fragment shader
I want to send a list of values into a fragment shader. It is a possibly large (couple of thousand ... method that is specifically designed for this purpose? Question&Answers:os...
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Oct 17, 2021
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opengl - Matrix inverse accuracy
I have a large world, about 5,000,000 x 1,000,000 units. The camera can be near some object or ... if my matrix is getting degenerated, suffer numerical issues? Question&Answers:os...
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Oct 17, 2021
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opengl es - Rendering to non-power-of-two texture on iPhone
Is it possible to render to texture with OpenGL ES 1.1 on the iPhone (2G and older)? If I bind a texture as a render ... POT. Maybe it can't be done on ES 1.1? Question&Answers:os...
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Oct 17, 2021
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opengl - Do conditional statements slow down shaders?
I want to know if "if-statements" inside shaders (vertex / fragment / pixel...) are really slowing down the shader ... the else and the other for the if part? Question&Answers:os...
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Oct 17, 2021
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opengl - GLSL fixed function fragment program replacement
When using the OpenGL fixed function pipeline for vertex setup, how a fragment program looks like that is ... that replaces GL's fixed function shader? Question&Answers:os...
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Oct 17, 2021
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opengl - How to implement 2D raycasting light effect in GLSL
This was originally asked by @sydd here. I was curious about it so I try to code it but It was ... input should be: mouse position background RGBA map texture Question&Answers:os...
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Oct 17, 2021
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opengl - Rotating a Group of Vectors
I am trying to rotate a group of vectors I sampled to the normal of a triangle If this was correct, the randomly ... ); // current vector I am trying to rotate Question&Answers:os...
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Oct 17, 2021
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opengl - Why transforming normals with the transpose of the inverse of the modelview matrix?
I am working on some shaders, and I need to transform normals. I read in few tutorials the way you transform normals ... so, and what is the logic behind that? Question&Answers:os...
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Oct 17, 2021
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opengl - glVertexAttribPointer and glVertexAttribFormat: What's the difference?
OpenGL 4.3 and OpenGL ES 3.1 added several alternative functions for specifying vertex arrays: glVertexAttribFormat, ... ? How do the new APIs work? Question&Answers:os...
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Oct 17, 2021
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opengl - Should I ever use a `vec3` inside of a uniform buffer or shader storage buffer object?
The vec3 type is a very nice type. It only takes up 3 floats, and I have data that only needs 3 floats. And I ... data2; float data3; }; Is this a good idea? Question&Answers:os...
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Oct 17, 2021
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opengl - Rendering meshes with multiple indices
I have some vertex data. Positions, normals, texture coordinates. I probably loaded it from a .obj file or ... I render this mesh data using OpenGL/Direct3D? Question&Answers:os...
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Oct 17, 2021
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opengl - How do I compose a rotation matrix with human readable angles from scratch?
The one thing that has always hindered me from doing 3D programming is failing to understand how math works. I can ... :400px;height:300px;"> </div> Question&Answers:os...
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Oct 16, 2021
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opengl - How do I display gluCylinder in a window?
This program can display a mesh of vertices and indices for cubes and stuff, but I don't know if I need ... .com/questions/65839462/how-do-i-display-glucylinder-in-a-window...
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Oct 7, 2021
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opengl - Is it ok to render Raycasting using vertex array?
Im making simple fps game using raycasting, because I thought its very fast and light method. My Raycasting function ... /65853999/is-it-ok-to-render-raycasting-using-vertex-array...
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Oct 7, 2021
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opengl es - OES_depth_texture and glReadPixels
The open gl es 2.0 extension, OES_depth_texture, enables writing of depth information to frame buffer ... stackoverflow.com/questions/65855648/oes-depth-texture-and-glreadpixels...
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Oct 7, 2021
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opengl - GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT trying to create multisample framebuffer
I'm trying to figure out how to create a framebuffer object that handles multisampling. Below is ... /gl-framebuffer-incomplete-attachment-trying-to-create-multisample-framebuffer...
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Oct 7, 2021
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opengl - Why can't I render my depth map on a quad?
Some intro: I'm currently trying to see how I can convert a depth map into a point cloud. In order to do this, ... .com/questions/65870882/why-cant-i-render-my-depth-map-on-a-quad...
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Oct 7, 2021
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opengl - How does Chrome support webgl on macOS?
I found libGLESv2.dylib libswiftshader_libGLESv2.dylib libvk_swiftshader.dylib in Chrome.app. And in https://webglreport. ... /65871044/how-does-chrome-support-webgl-on-macos...
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Oct 7, 2021
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opengl - How can I render to multiple attachments of a FBO?
After some studying I found out how to render to a single texture using a color attachment. However, I'd like to ... /65872762/how-can-i-render-to-multiple-attachments-of-a-fbo...
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Oct 7, 2021
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opengl - How do I get a GstGLContext out of an element like a gltestsrc?
I have a gstreamer app that also uses OpenGL. In order to run GL code I must run it on the GL thread. In order ... /how-do-i-get-a-gstglcontext-out-of-an-element-like-a-gltestsrc...
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Oct 7, 2021
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opengl - How to include <glad/glad.h> into several header files in C++?
I have a project in C++ using opengl. I have main.cpp working with openGL initialization, creating window and stuff like ... -to-include-glad-glad-h-into-several-header-files-in-c...
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Oct 7, 2021
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793
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opengl - GLSL fixed function fragment program replacement
When using the OpenGL fixed function pipeline for vertex setup, how a fragment program looks like that is ... migrate-from-fixed-function-to-modern-glsl-lighting-and-material...
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Oct 7, 2021
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opengl - Importing 3D CAD files in python as dask array
I am trying to import a 3D file created by TexGen in python. I would like to have a dask array at the end ... .com/questions/65950292/importing-3d-cad-files-in-python-as-dask-array...
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opengl - Question about instancing, instanced arrays and buffer updating
In one of my previous questions (How to instance draw with different transformations for multiple objects) ... /question-about-instancing-instanced-arrays-and-buffer-updating...
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Oct 7, 2021
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opengl - Should I use the last GLSL version where it is possible?
My cross-platform graphics program uses shaders written in GLSL version 1.40. GLSL 1.40 features fully satisfy the needs ... should-i-use-the-last-glsl-version-where-it-is-possible...
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opengl - How to keep mouse coordinates within window height/width limits
Suppose I have a 600 by 600 window created through glfwCreateWindow(). I have a few models rendered in the ... /how-to-keep-mouse-coordinates-within-window-height-width-limits...
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Oct 7, 2021
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opengl - How to correctly draw other texture in fragment shader?
How to correctly calculate uv coordinates for my sampler2D uniform? E.g. i have main texture which has 1920x1080 ... 65641145/how-to-correctly-draw-other-texture-in-fragment-shader...
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Oct 7, 2021
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