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as seen on Ask Ubuntu
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I am facing a very frustrating issue with my computer right now. I successfully upgraded to Ubuntu 12.10 this afternoon, but after the upgrade, the graphical user interface seems completely broken. To be more specific, I can not get the Unity bar to appear on the right.
I have tried many things,…
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as seen on Game Development
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What should I learn? OpenGL 4.1 or OpenGL ES 2.0?
I will be developing desktop applications using Qt but I may start developing mobile applications in a few months, too. I don't know anything about 3D, 3D math, etc and I'd rather spend 100 bucks in a good book than 1 week digging websites and going…
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as seen on Programmers
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I was doubting: I'm writing a cross-platform engine OpenGL C++, I figured out windows forces the developers to access OpenGL features above 1.1 through extensions.
Now the thing is, on Linux, I know that I can directly access functions if the version supports it through glext.h and opengl version…
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as seen on Game Development
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I have migrated my code from OpenGL ES 2/3 to OpenGL 3 (I added bunch of defines and abstract classes to encapsulate both versions, so I have both in one project and compile only one or another). All I need to change was context initialization and glClearDepth. I dont have any errors. This was kind…
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as seen on Game Development
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When I try to run my lwjgl project, an error pops . Here is the log file:
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A fatal error has been detected by the Java Runtime Environment:
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EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d8fcc0a, pid=5612, tid=900
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JRE version: 6.0_16-b01
Java VM: Java HotSpot(TM) Client VM (14.2-b01 mixed…
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as seen on Geeks with Blogs
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In this post we'll look at the AlphaBlend() api and how it can be used for semi-transparent blitting. AlphaBlend() takes a source device context and a destination device context (DC) and combines the bits in such a way that it gives a transparent effect. Follow the links for the msdn documentation…
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as seen on Stack Overflow
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What glBlendFunc should I use to ensure that the opacity of my drawing is always the same? When I use glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) and multiple images are drawn on top of each other, the result is more and more opaque until it's completely opaque after a certain number of imgaes…
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as seen on Stack Overflow
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I am trying to blend textures which have transparent areas:
glEnable( GL_TEXTURE_2D );
glBindTexture( GL_TEXTURE_2D, ...);
glVertexPointer( 2, GL_FLOAT, 0, ... );
glEnable (GL_BLEND);
glBlendFunc (GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glDrawArrays( GL_TRIANGLE_STRIP, 0, 4 );
Unless I add glDisable(GL_DEPTH_TEST)…
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as seen on Stack Overflow
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I need to make transparency, having 2 pixels:
pixel1: {A, R, G, B} - foreground pixel
pixel2: {A, R, G, B} - background pixel
A,R,G,B are Byte values
each color is represented by byte value
now I'm calculating transparency as:
newR = pixel2_R * alpha / 255 + pixel1_R * (255 - alpha) / 255
newG…
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as seen on Stack Overflow
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I'm using these function calls:
glEnable(GL_BLEND)
glEnable(GL_POLYGON_SMOOTH)
glBlendFunc(GL_SRC_ALPHA_SATURATE, GL_ONE)
It doesn't work and wont render.
glEnable(GL_BLEND)
glEnable(GL_POLYGON_SMOOTH)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
It doesn't anti-alias.
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