texture buffer shader fails to compile

[debonair]

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

[kyle_]

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'.

[debonair]

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

[thokra]

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);

[kyle_]

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

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