I wanna get some old art style (256 color, dithering, etc) in modern OpenGL in an effective way. Maybe using a low resolution (320x240) rendered at a bigger space so that the pixels looks "bigger?" I'd just like to fake this old style on modern GPUs.
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1\$\begingroup\$ Color palettes and upscaling your 320x240 image to your (most likely) 1920x1080 screen can easily be done in a postprocessing shader. A toon shader/cel shader should be a good starting point. \$\endgroup\$ – tkausl Mar 3 at 23:53
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\$\begingroup\$ So you talking about render the scene in a 320x240 buffer and after render like a image in bigger resolution... This would be a opmized way to do in Real time? \$\endgroup\$ – Gobbs Mar 4 at 0:06
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4\$\begingroup\$ All of your questions have been answered elsewhere, low resolution, limited colors, and although not on an SE site, there's a blog post about dithering \$\endgroup\$ – Bálint Mar 4 at 0:59
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To get pixelated look, you can use OpenGL's framebuffer functionality to render to texture (glFramebufferTexture2D etc.), then draw that texture as a rectangle with nearest-neighbour scaling.
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1\$\begingroup\$ This answer would greatly benefit from a short example! \$\endgroup\$ – Alexandre Vaillancourt♦ Apr 4 at 12:48
