Recent questions tagged OpenGL

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opengl - Using unProject correctly in Java Libgdx

I want to make a button clickable, but it isn't working - it seems like I need to use unproject() but I can't figure ... 1); batch.end(); } } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl es - What is the precision of highp floats in GLSL ES 2.0 (for iPhone/iPod touch/iPad)?

I have a shader that ideally needs 28 bits of mantissa, though I can use less and degrade performance. How can I ... to ask OpenGL. Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - Is it possible to rotate an object around its own axis and not around the base coordinate's axis?

I am following the OpenGL es rotation examples from google to rotate a simple square (not a cube) on my Android App ... .position(0); . . . See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl es - Drawing a border on a 2d polygon with a fragment shader

I have some simple polygons (fewer than 20 vertices) rendering flat on a simple xy plane, using GL_TRIANGLES ... as border/fill as appropriate? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - Rotating an object around a fixed point using glMultMatrix

Rotating an object around (x,y,0) : //2D glTranslatef(-x, -y, 0); glRotatef(theta, 0.0, 0.0, 1.0); ... y, 0); is sequence of matrices correct?! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - GLSL per-pixel spinlock using imageAtomicCompSwap

OpenGL red book version 9 (OpenGL 4.5) example 11.13 is Simple Per-Pixel Mutex. It uses imageAtomicCompSwap ... not conform with OpenGL spec? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - Convert Quaternion rotation to rotation matrix?

Basically, given a quaterion (qx, qy, qz, qw)... How can i convert that to an OpenGL rotation matrix? I ... quaternion that I need in vectors... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - Using the mouse scrollwheel in GLUT

I want to use the mouse scrollwheel in my OpenGL GLUT program to zoom in and out of a scene? How do I do that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - How do I find my mouse point in a scene using SceneKit?

I have set up a scene in SceneKit and have issued a hit-test to select an item. However, I want to be able ... for the 3D object I am dragging? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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502 views

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opengl - Why does GL divide `gl_Position` by W for you rather than letting you do it yourself?

Note: I understand the basic math. I understand that the typical perspective function in various math libraries produces a ... id="c"></canvas> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - glVertexAttribPointer clarification

Just want to make sure I understand this correctly (I'd ask on SO Chat, but it's dead in there!): ... , when different Vertex Arrays are bound? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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942 views

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opengl - How to use Pivot Point in Transformations

How to translate object using Center point I have a rectangle which has a center point away from the position of ... am using a center Point. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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528 views

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opengl - What exactly are eye space coordinates?

As I am learning OpenGL I often stumble upon so-called eye space coordinates. If I am right, you typically ... convert something to eye space? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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928 views

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opengl - How to debug a GLSL shader?

I need to debug a GLSL program but I don't know how to output intermediate result. Is it possible to make ... (like with printf) with GLSL ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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633 views

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opengl - When I run the .jar, I get a "No lwjgl in java.library.path" error

I'm making a basic game in Java using the LWJGL Library via Netbeans. I've created a library with the ... get this working outside of netbeans? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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676 views

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opengl - The purpose of Model View Projection Matrix

For what purposes are we using Model View Projection Matrix? Why do shaders require Model View Projection Matrix? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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856 views

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opengl - depth buffer got by glReadPixels is always 1

I'm using glReadPixels to get depth value of select pixel, but i always get 1, how can i solve it? ... .PopMatrix(); glutSwapBuffers(); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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459 views

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opengl - Why does java app crash in gdb but runs normally in real life?

Attempting to run java app from gdb results in segfault, yet running app alone does not. This app is a . ... and situation hasn't changed much. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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570 views

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opengl - Wrap an image around a cylindrical object in HTML5 / JavaScript

I want to wrap an image around a cylindrical object like mugs in a web app, like so This will likely be ... provide an answer to this question. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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