hi cippyboy,
i tried following shader, can't reproduce your issue (use the shader to draw).
with R9 285 & HD7950 (tahiti)
// GLSL
#version 440 compatibility
out vec4 s_frag_color;
layout(rgba32f) uniform sampler2DMS image01;
uniform float numSamp;
void main()
{
vec4 v1 = vec4(0.0);
for (int i = 0; i < numSamp; i++)
{
v1 += texelFetch(image01, ivec2(0,0), i);
}
s_frag_color = v1;
}
// end of GLSL
thank you anyway.
regards
davy