Recent questions tagged Opengl

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I reached a point in my wip game, where I want to make it more eye-appealing. Currently I add ... design, performance and possible restrictions. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - Reading the pixels values from the Frame Buffer Object (FBO) using Pixel Buffer Object (PBO)

Can I use Pixel Buffer Object (PBO) to directly read the pixels values (i.e. using glReadPixels) from the ... ); //back to window framebuffer See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - How to copy texture1 to texture2 efficiently?

I want to copy texture1 to texture2. The most stupid way is copying tex1 data from GPU to CPU, and then ... efficient way to implement this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - What is the meaning of the parameters to glShaderSource?

I've tried my hardest to understand the functions of OpenGL in-depth, but I have an issue with glShaderSource' ... thats even possible? And why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - gluPerspective, glViewport, gluLookAt and the GL_PROJECTION and GL_MODELVIEW Matricies

Original Question I want to use 'gluPerspective', 'glViewport' and 'gluLookAt' to manipulate my camera and ... and possibly other things. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl es - Problem with getFloatv function in GL11 (Android)

I'm learning Open GL ES and would like to get a more intuitive interface with 3D objects than the one suggested by ... ; } Thank you in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl es 2.0 android c++ glGetTexImage alternative

when testing on windows the code works as expected, but on android the glGetTexImage api doesn't exist, is there ... pixels); return pixels; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl es 2.0 - normal matrix for non uniform scaling

Im trying to calculate the normal matrix for my GLSL shaders on OpenGL 2.0. The theory is : a normal ... it computed with non uniform scale? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - Difference between single buffered(GLUT_SINGLE) and double buffered drawing(GLUT_DOUBLE)

I'm using example here it works under glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); but it become a transparent ... GLUT_DOUBLE and GLUT_SINGLE? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - xcode 5 deprecation warning about glut functions

I just upgrade my mac os x 10.6.8 to 10.9 this morning. Everything goes fine except the Xcode 5 with OpenGL Glut ... in OS X 10.9. ... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - GLSL, Array of textures of differing size

When doing multitexturing in GLSL, is there anyway to have an indexable array of samplers where each texture is a ... ass. Is there a solution? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - understanding glVertexAttribPointer?

private int vbo; private int ibo; vbo = glGenBuffers(); ibo = glGenBuffers(); glBindBuffer(GL_ARRAY_BUFFER, vbo); ... since there are two vbos? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - What is hardware cursor and how does it work?

Is there anyone who can explain how hardware cursor works precisely? How does it relate to the graphics I' ... were sufficient. Works perfectly. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - What can cause glDrawArrays to generate a GL_INVALID_OPERATION error?

I've been attempting to write a two-pass GPU implementation of the Marching Cubes algorithm, similar to the one ... , 0, 0); glUseProgram(0); glDisable(GL_RASTERIZER_DISCARD);...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - Difference between format and internalformat

I did search and read stuff about this but couldn't understand it. What's the difference between a ... GL_RGBA_INTEGER invalid in this context? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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683 views

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opengl - Should I calculate matrices on the GPU or on the CPU?

Should I prefer to calculate matrices on the CPU or GPU? Let's say I have the following matrices P * V * ... final matrix faster than the CPU? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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567 views

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opengl es - How WebGL works?

I'm looking for deep understanding of how WebGL works. I'm wanting to gain knowledge at a level that most ... your system to make it possible. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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621 views

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opengl - How do I render thick 2D lines as polygons?

I have a path made up of a list of 2D points. I want to turn these into a strip of triangles in ... width aligned and centered on each segment. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - How interfacing with graphics card work with C or C++?

Libraries such as OpenGL access the graphics card and can produce graphics programs, how does these libraries access the ... the web or books. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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911 views

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opengl es - How to limit framerate when using Android's GLSurfaceView.RENDERMODE_CONTINUOUSLY?

I have a C++ game running through JNI in Android. The frame rate varies from about 20-45fps due to scene ... Any reliable way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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765 views

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opengl - gluPerspective parameters- what do they mean?

I wonder about the gluPerspective parameters. In all examples I see fovy is set to around 45-60degrees I've tried ... 500+ what does it reflect? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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558 views

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opengl - Use of Vertex Array Objects and Vertex Buffer Objects

I am trying to understand these two, how to use them and how they are related. Let's say I want to ... concepts must be understood and used. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - When does the transition from clip space to screen coordinates happen?

I was studying the rendering pipeline and when I got to the clipping stage it was explained that from the view ... writing on the frame buffer? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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665 views

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opengl es 2.0 - Android emulator black screen with "GPU emulation - yes"

I'm trying to use the new feature of the android avd features "GPU emulation - yes" It's needed to use GLES2 ... I call it from command line. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opengl - undefined reference to '_imp___glewGenBuffers'

I am having the following link errors regarding glew library when compiling an opengl 2.1 program on code blocks,mingw ... . What else is left? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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568 views

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opengl es - 3D texture in WebGL/three.js using 2D texture workaround?

I would like to use some 3D textures for objects that I'm rendering in WebGL. I'm currently using the ... find a workable solution so far. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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750 views

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opengl - GLSL - Weird syntax error "<"

I'm trying to use a shader but it keeps telling me this error on both fragment and vertex shader: error(#132) ... I really don't know why. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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475 views

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opengl es - how to make iphone apps like ibeer, imilk, ibug, ibeer

I was visiting this website with cool animated apps. I was wondering how's the easiest way of building a app ... a good case of cocos2d usage? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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