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From Fabio Mierlo,

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"I add a new option in the HDR Reader.

The RAW option store the RGBE values into a Image, to use
this option you need to decode the RGBE value in the frag-
ment shader. Follow the cube map glsl decoder:

vec4 textureCubeRGBE( uniform samplerCube sampler, vec3 coords )
{
   ivec4 rgbe = textureCube( sampler, coords ) * 255. + 0.5;
   float e = rgbe.a - ( 128 + 8 );
   return vec4( rgbe.rgb * exp2( e ), 1.0 );
}

This option is usefull for who have a outdate hardware like
FX cards and want to do cool things.

Finally this patch is need by a new HDR Rendering example
that I will put on the Wiki."
This commit is contained in:
Robert Osfield
2005-08-22 13:54:43 +00:00
parent 2fa2041655
commit 8e3f4e4890
3 changed files with 62 additions and 13 deletions
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44
src/osgPlugins/hdr/ReaderWriterHDR.cpp
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@@ -57,6 +57,7 @@ public:
float mul = 1.0f;
bool bYFlip = false;
bool convertToRGB8 = false;
bool rawRGBE = false;
if(_opts)
{
std::istringstream iss(_opts->getOptionString());
@@ -71,6 +72,22 @@ public:
{
convertToRGB8 = true;
}
/* RAW: store the RGBE values into a Image, to use this option you
* need to decode the RGBE value in the fragment shader. Follow
* the cube map glsl decoder:
*
* vec4 textureCubeRGBE( uniform samplerCube sampler, vec3 coords )
* {
* ivec4 rgbe = textureCube( sampler, coords ) * 255. + 0.5;
* float e = rgbe.a - ( 128 + 8 );
* return vec4( rgbe.rgb * exp2( e ), 1.0 );
* }
*
*/
else if(opt == "RAW")
{
rawRGBE = true;
}
else if(opt == "YFLIP")
{
bYFlip = true; // TODO
@@ -79,7 +96,7 @@ public:
}
HDRLoaderResult res;
bool ret = HDRLoader::load(_file.c_str(), res);
bool ret = HDRLoader::load(_file.c_str(), rawRGBE, res);
if (!ret)
return ReadResult::FILE_NOT_FOUND;
@@ -110,8 +127,8 @@ public:
int dataType = GL_UNSIGNED_BYTE;
img->setFileName(_file.c_str());
img->setImage( res.width, res.height, 1,
3,
img->setImage( res.width, res.height, 1,
3, // Why this value are here?
pixelFormat,
dataType,
(unsigned char*) rgb,
@@ -119,18 +136,31 @@ public:
}
else
{
int internalFormat = GL_RGB;
int pixelFormat = GL_RGB;
int internalFormat;
int pixelFormat;
int dataType = GL_FLOAT;
if (rawRGBE)
{
internalFormat = GL_RGBA8;
pixelFormat = GL_RGBA;
} else {
// In a perfect world it should be GL_RGB32F_ARB,
// but by default it works fine as GL_RGB8. You
// can set it as GL_RGB32F_ARB in the method
// setInternalFormat of osg::Texture{xD, Rectangle
// and CubeMap} if your GPU support it.
internalFormat = GL_RGB8;
pixelFormat = GL_RGB;
}
img->setFileName(_file.c_str());
img->setImage( res.width, res.height, 1,
img->setImage( res.width, res.height, 1,
internalFormat,
pixelFormat,
dataType,
(unsigned char*) res.cols,
osg::Image::USE_NEW_DELETE);
}
return img;