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How to use texelFetch with GL_TEXTURE_2D?
source link: https://www.codesd.com/item/how-to-use-texelfetch-with-gl-texture-2d.html
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How to use texelFetch with GL_TEXTURE_2D?
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I tried:
#version 130
uniform sampler2D texID;
in vec2 texcoord;
out vec4 outcolor;
void main(void) {
vec2 tcoord=texcoord.xy*768.0;
ivec2 tst=ivec2(tcoord.x,tcoord.y);
outcolor=texelFetch(texID,tcoord);
}
And got error on the line with the texelFetch:
unable to find compatible overloaded function "texelFetch(sampler2D, vec2)".
I didn't putted those parameters from my head here few sources:
TheQuestion: Is there a way to use GL_TEXTURE_2D with texelFetch or just direct read pixels from texture when executing shader?
Check the 1.30 spec, page 89.
None of the five texelFetch() overloads take two arguments:
gvec4 texelFetch (gsampler1D sampler, int P, int lod)
gvec4 texelFetch (gsampler2D sampler, ivec2 P, int lod)
gvec4 texelFetch (gsampler3D sampler, ivec3 P, int lod)
gvec4 texelFetch (gsampler1DArray sampler, ivec2 P, int lod)
gvec4 texelFetch (gsampler2DArray sampler, ivec3 P, int lod)
You need a third parameter.
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