Hi i work with PShader and i really want to get not smoothed pixels from texture2D. How do i set texture sampling NEAREST in PGraphics in P2D render?

Here’s the same code I’ve been posting, but changed to version 300 es: PGraphics thing; PShader shdr; void setup() { size( 800, 800, P2D ); shdr = new PShader( this, vertSrc, fragSrc ); thing = createGraphics( 16, 16, P2D ); thing.noSmooth(); thing.beginDraw(); // begin/draw pair neede…

Or you can ignore the sampling and just always read from exactly the center of the pixels: PGraphics thing; PShader shdr; void setup() { size( 800, 800, P2D ); shdr = new PShader( this, vertSrc, fragSrc ); thing = createGraphics( 16, 16, P2D ); thing.noSmooth(); thing.beginDraw(); // b…

Thanks for your reply! When I try to use textlFetch, I get lots of errors. #ifdef GL_ES precision highp float; #endif uniform sampler2D texture; void main() { gl_FragColor = texelFetch(texture, ivec2(gl_FragCoord.xy), 0); } To be honest, I’m not sure exactly what I’m doing wrong. I’d be very g…

Yes, that’s exactly what I tried to do first. But I noticed that the colour of the pixels at the colour boundaries still becomes slightly blurred. For example, it used to be (255,255,255,255) and became (254,254,254,254). After a series of tests, I concluded that this was specifically due to bilinea…

Add #version 130 core as the first line of your shader. PGraphics thing; PShader shdr; void setup() { size( 800, 800, P2D ); shdr = new PShader( this, vertSrc, fragSrc ); thing = createGraphics( 16, 16, P2D ); thing.noSmooth(); thing.beginDraw(); // begin/draw pair needed to thing.…

Ah, sorry, I just saw the APDE part. That means you’re using OpenGL ES. Put #version 300 es at the start of your shaders. You might like to read through https://registry.khronos.org/OpenGL/specs/es/3.0/GLSL_ES_Specification_3.00.pdf to learn the particulars. In later versions of glsl, they rep…

Errors: java.lang.RuntimeException: Cannot compile fragment shader: 0:3: S0022: Symbol ‘texture’ redeclared 0:8: L0001: Symbol ‘texture’ can’t be referenced as a variable 0:9: L0001: Symbol ‘texture’ can’t be referenced as a variable at processing.core.PGraphics.showException(PGraphics.java:57…

The solution is very simple – we just need to rename the variable, for example to mytexture. And it seems to work perfectly. The image doesn’t become blurry when zoomed in. Anyway, thanks for your help! I’m really grateful to you!!! @scudly

Texture sampling NEAREST in P2D render

Processing Coding Questions

scudly April 4, 2026, 6:33pm 2

Within glsl, you can use texelFetch() to read non-filtered data from a single pixel. Does that match what you are trying to do?

Performance issues with PGraphics layers and image() calls

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Texture sampling NEAREST in P2D render

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