Hi,
my card is a Nvidia geforce 8800 gtx:
http://www.nvidia.com/page/8800_tech_specs.html
It say "32-bit per component floating point texture filtering and blending".
Jonathan
On 2009-05-25 10:26am, "JP Delport" <[email protected]> wrote:
Hi,
are you sure your hardware supports 32-bit blending? What card/drivers
are you using?
We've tried identifying the effective resolution of blending on various
cards. I don't have the results handy, will try to get them.
jp
[email protected] wrote:
Hi, I'm using the osgViewer ::Viewer to perform floating point rendering
in an FBO and I have a problem when blending is enabled. My blending
function is defined by GL_ONE_MINUS_SRC_ALPHA for destination and GL_ONE
for source. The problem occurs when I draw a facet with a small color in
front of a facet with a big color. For example lets define:
Rd = (0.2, 0.0, 0.0, 1.0) // RGBA
Rs = (6e-9, 0.0, 0.0, 1.0) //RGBA
In theory I was expecting to get:
Rd = Rs + (1-As)Rd
Rd = 6e-9 + (1-1)*0.2
Rd = 6e-9 +(0)*0.2 = 6e-9
but I get1.7920927e-8
Does someone have an idea what is going on? I currently using the
GL_FLOAT_RGBA32_NV format as internal format of my attached texture. I
have also tried the GL_FLOAT_RGBA16_NV, GL_RGBA32F_ARB, GL_RGBA16F_ARB
and I always get the same kind of results. Tell me if you need part of my
code in order to help me.
Thank you
Jonathan
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