Recent questions tagged OpenGL

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opengl - Multitexturing theory with texture objects and samplers

I couldn't find any good theory articles on how to code multitexturing with either only texture objects or ... sampler with multiple textures? 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 - Can't get Freeglut to work with Haskell on Windows

Here is my source code I'm trying to get to work: In Main.hs: import Graphics.Rendering.OpenGL ... (unknown GLUT entry glutMouseWheelFunc) 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 - Preserve aspect ratio of 2D object on window resize

I have a Windows (XP) application which needs to display a two-dimensional rectangle within a window. The rectangle must ... ( pDC ) ; } } 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 - How do I convert between float and vec4,vec3,vec2?

This question is very related to the question here(How do I convert a vec4 rgba value to a float?). ... not use the simple bitshifting way. 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 - How to get CATransform3D from Projection and ModelView matrices?

all, I've got an iphone project that draws a 3D model using OpenGL-ES for a given model view matrix and ... } Any help will be appreciated. See Question&Answers more detail:os...

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

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644 views

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opengl es - WebGL shaders: maximum number of varying variables

From the OpenGL ES spec section 2.10.4 (Shader Variables: Varying Variables): The number of interpolators ... guaranteed to always work? See Question&Answers more detail:os...

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

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628 views

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opengl - Determining available video memory

When developing an OpenGL program, is there a way to poll from the system to find out just how many ... memory and forget about everything? See Question&Answers more detail:os...

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

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599 views

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opengl es - Android OpenGL2.0 showing black textures

I am trying to draw textures onto quads in OpenGL2.0. So far I got the quads to show up and everything, ... Any help will be much appreciated. 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 to apply texture to glutSolidCube

I can find tutorials about mapping textures to polygons specifying vertices etc. but nothing regarding how to ... ) when using glutSolidCube? See Question&Answers more detail:os...

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

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840 views

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opengl - Using GLUT bitmap fonts

I'm writing a simple OpenGL application that uses GLUT. I don't want to roll my own font rendering code, ... the steps to get them working? See Question&Answers more detail:os...

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

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625 views

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opengl - What is a dependent texture read?

I've been reading papers on computer graphics, and every so often I come across the term "dependent texture read" ... a "normal" texture read? See Question&Answers more detail:os...

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

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838 views

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opengl es - Android -- GLSurfaceView EGL_BAD_ALLOC

My program switches between two Activities that each inflate a derived GLSurfaceView that uses VBOs. After switching ... WHATSOEVER GETS +200. See Question&Answers more detail:os...

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

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651 views

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opengl es - Packing float into vec4 - how does this code work?

I am trying to study shadow mapping in WebGL. I see same piece of shader code copied in various libraries and ... . Can anyone shed some light? See Question&Answers more detail:os...

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

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600 views

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opengl es - How do I make a water effect view with openGLES on the iPhone?

I found this vid: http://www.youtube.com/watch?v=eVi6ThY3LRs I wonder if that's some kind of standard effect ... tutorial for this on the web? See Question&Answers more detail:os...

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

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686 views

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opengl es - Non power of two textures in iOS

In my iOS app (targeted for iPad), I'd like to use non power of two (NPT) textures. My GL_VERSION query ... this or answer my own 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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591 views

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opengl - How to Using the #include in glsl support ARB_shading_language_include

I wan't to use the #include macro to include shader files in glsl, and I heard there is a ... to use the #include macro? See Question&Answers more detail:os...

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

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553 views

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opengl es - How to use OpenCL on Android?

For plattform independence (desktop, cloud, mobile, ...) it would be great to use OpenCL for GPGPU ... OpenCL code within Android Apps. See Question&Answers more detail:os...

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

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860 views

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opengl - How to change hue of a texture with GLSL?

Is there a way to efficiently change hue of a 2D OpenGL texture using GLSL (fragment shader)? Do someone ... is the original unmodified image: See Question&Answers more detail:os...

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

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830 views

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opengl - Proper way to delete GLSL shader?

My code approaches GLSL shader management in the way, that it creates each shader and the associated program and ... this is always true? See Question&Answers more detail:os...

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

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604 views

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opengl - What are Vertex Array Objects?

I am just starting to learn OpenGL today from this tutorial: http://openglbook.com/the-book/ I got to chapter ... a better tutorial to follow? See Question&Answers more detail:os...

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

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532 views

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opengl - Differences and relationship between glActiveTexture and glBindTexture

From what I gather, glActiveTexture sets the active "texture unit". Each texture unit can have multiple texture ... 's really confusing me. See Question&Answers more detail:os...

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

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656 views

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opengl - Why are Uniform variables not working in GLSL?

I am currently trying to create a Blur Shader for postprocessing purposes using LWJGL, but stumbled across a problem. ... , what am I missing? See Question&Answers more detail:os...

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

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615 views

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opengl - How to cast int to const GLvoid*?

In my cross platform OpenGL application I want to draw using vertex buffer objects. However I run into ... compiler imposing rigorous checks? See Question&Answers more detail:os...

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

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687 views

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opengl - GLEW Linker Errors (undefined reference to `__glewBindVertexArray')

I've recently made the decision to re-write some OpenGL code for a game using im working on using non depreciated ... i did link "glew32.lib" See Question&Answers more detail:os...

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

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686 views

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opengl - GLSL, semaphores?

I was having previously already the problem that I wanted to blend color values in an image unit by doing ... can someone give an example? See Question&Answers more detail:os...

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

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463 views

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opengl - Frequency of shader invocations in rendering commands

Shaders have invocations, which each are (usually) given a unique set of input data, and each (usually) write ... does each shader get invoked? See Question&Answers more detail:os...

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

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657 views

1 answer

opengl es - How do I convert a vec4 rgba value to a float?

I packed some float data in a texture as an unsigned_byte, my only option in webgl. Now I would like unpack it in ... from the vec4 to a float? See Question&Answers more detail:os...

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

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514 views

1 answer

opengl es - Responding to RAM availability in iOS

I have a texture-heavy OpenGL game that I'd like to tune based on how much RAM the device has. The highest ... be stored in a lossless format. See Question&Answers more detail:os...

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

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