Hi!
Well, i don't understand why but the shaders are working now on my
laptop... And i didn't change my code! Maybe my laptop had an update about
shaders...
So now, i don't have any errors anymore. :) I thank you anyway!
But still, i have another question. Shaders are made above all for 3D real
time, so that an application is even faster, more powerful, right? But i tested
my application to see the difference without and with shaders. So i created
lots of GL_POINT (1 000 000) in a cube of size 1e10. When there are no shaders,
the frame rate can drop to 20fps and the GPU can go up til 37, and it's exactly
the same with shaders. I can understand those numbers without shaders, but with
shaders... i do not understand. And why does the GPU work so much without any
shaders?
Here is my code for shaders:
osg::ref_ptr<osg::StateSet> sset = new osg::StateSet;
sset->setMode(GL_VERTEX_PROGRAM_POINT_SIZE, osg::StateAttribute::ON);
osg::ref_ptr<osg::Program> program = new osg::Program;
program->addShader(new osg::Shader(osg::Shader::VERTEX, _vertexShaderProgram));
program->addShader(new osg::Shader(osg::Shader::FRAGMENT,
_fragmentShaderProgram));
sset->setAttributeAndModes(program.get(), osg::StateAttribute::ON);
osg::ref_ptr<osg::Uniform> _starAlpha = new osg::Uniform("starAlpha", 1.0f);
osg::ref_ptr<osg::Uniform> _pointSize = new osg::Uniform("pointSize",1.0f);
sset->addUniform(_starAlpha.get());
sset->addUniform(_pointSize.get());
And then i assign sset to the Geode that contains the Geometry with all the
GL_POINT.
And here are the code for GLSL shaders:
const std::string CStars::_vertexShaderProgram =
"uniform float starAlpha;"
"uniform float pointSize;"
"varying vec4 starColor;"
"void main()"
"{"
" starColor = gl_Color - 1.0 + starAlpha;"
" gl_PointSize = pointSize;"
" gl_ClipVertex = gl_ModelViewProjectionMatrix * gl_Vertex;"
" gl_Position = ftransform();"
"}";
const std::string CStars::_fragmentShaderProgram =
"varying vec4 starColor;"
"void main()"
"{"
" gl_FragColor = starColor;"
"}";
I want to precise that these shaders are exactly the same that in osgEphemeris
for the stars, and i took the shaders code to test in my application.
If you have any idea to help me that would be great.
I thank you very much in advance!
Belthil
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