Texture buffer shader fails to compile

OpenGL
1

Hi,
I am trying to implement texture buffer in my code but my shader gives failure while compilation .
My shader is :

#extension EXT_gpu_shader4 : enable
in vec2 v_texCoord;
uniform samplerBuffer s_texture;
out vec4 Color;
void main()
{
Color = texelFetch(s_texture,v_texCoord,0);
}

The errors are:
Fragment shader failed to compile with the following errors:
ERROR: 0:8: error(#202) No matching overloaded function found texelFetch
ERROR: 0:8: error(#160) Cannot convert from ‘const float’ to ‘out 4-component vector of float’
ERROR: error(#273) 2 compilation errors. No code generated

Please correct me …

Regards,
Roshan

2

Consider signature of texelFetch of texture buffer

gvec4 texelFetch (gsamplerBuffer sampler, int P)

It only takes sampler and a single integer coordinate, you are feeding it vec2 coordinate and additional ‘0’.

3

I referred to this page
http://www.opengl.org/sdk/docs/manglsl/xhtml/texelFetch.xml
in which gvec4 texelFetch(gsampler1DArray sampler, ivec2 P, int lod); takes 3 params.

4 

in vec2 v_texCoord;

This is a float vector. texelFetches take integer texture coordinates.


Color = texelFetch(s_texture,ivec2(v_texCoord),0);

will technically work. However, since float tex coords are in the range [0, 1] you won’t fetch the correct texels. You need


ivec2 iTexCoord = ivec2(v_texCoord) * ivec2(textureWidth, textureHeight);
5

[QUOTE=debonair;1240835]I referred to this page
http://www.opengl.org/sdk/docs/manglsl/xhtml/texelFetch.xml
in which gvec4 texelFetch(gsampler1DArray sampler, ivec2 P, int lod); takes 3 params.[/QUOTE]

You need the overload for ‘gsamplerBuffer’ not ‘gsampler1DArray’.
The page you linked has the same delaration for it as one quoted by me.

6

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