Hi,
I can successfully bind a Vec3 attribute to my vertices. But somehow, calling
setVertexAttribArray with an IntArray doesn't work for me.
I have attached a modified osggeometryshaders.cpp file to illustrate my issue.
Summary of changes:
Code:
// all shader versions changed to #version 150
// Vertex shader changes
in int inIndex;\n // declare attribute
void main(void)\n
{\n
v_color = vec4(inIndex == 1234 ? 1.0 : 0.0, 0.0, 1.0, 1.0);\n // if the
attribute is the expected value, the color will be violet - blue otherwise
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n
}\n
// C++ code changes
// createShader() changes:
#ifdef ENABLE_GEOMETRY_SHADER
pgm-addShader( new osg::Shader( osg::Shader::GEOMETRY, geomSource ) );
pgm-setParameter( GL_GEOMETRY_VERTICES_OUT_EXT, 4 );
pgm-setParameter( GL_GEOMETRY_INPUT_TYPE_EXT, GL_POINTS );
pgm-setParameter( GL_GEOMETRY_OUTPUT_TYPE_EXT, GL_LINE_STRIP );
pgm-addBindAttribLocation(inIndex, 6); // bind vertex attribute
#endif
// SomePoints() changes at the end of the constructor:
osg::IntArray *intArray = new osg::IntArray();
intArray-push_back(1234);
intArray-push_back(1234);
intArray-push_back(1234);
intArray-push_back(1234);
intArray-push_back(1234);
intArray-push_back(1234);
intArray-push_back(1234);
intArray-push_back(1234);
intArray-setName(inIndex);
this-setVertexAttribArray(6, intArray);
this-setVertexAttribNormalize(6, false);
this-setVertexAttribBinding(6, osg::Geometry::BIND_PER_VERTEX);
I've looked at the GL trace and it seems correct. There must be something I'm
missing.
Cheers,
Fred
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=39367#39367
/* OpenSceneGraph example, osgshaders2
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the Software), to deal
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/* file:examples/osgshaders2/osgshaders2.cpp
* author: Mike Weiblen 2008-01-03
* copyright: (C) 2008 Zebra Imaging
* license: OpenSceneGraph Public License (OSGPL)
*
* A demo of GLSL geometry shaders using OSG
* Tested on Dell Precision M4300 w/ NVIDIA Quadro FX 360M
*/
#include osg/Notify
#include osg/ref_ptr
#include osg/Geode
#include osg/Geometry
#include osg/Point
#include osg/Vec3
#include osg/Vec4
#include osg/Program
#include osg/Shader
#include osg/Uniform
#include osgViewer/Viewer
// play with these #defines to see their effect
#define ENABLE_GLSL
#define ENABLE_GEOMETRY_SHADER
///
#ifdef ENABLE_GLSL
class SineAnimation: public osg::Uniform::Callback
{
public:
SineAnimation( float rate = 1.0f, float scale = 1.0f, float offset = 0.0f ) :
_rate(rate), _scale(scale), _offset(offset)
{}
void operator()( osg::Uniform* uniform, osg::NodeVisitor* nv )
{
float angle = _rate * nv-getFrameStamp()-getSimulationTime();
float value = sinf( angle ) * _scale + _offset;
uniform-set( value );
}
private:
const float _rate;
const float _scale;
const float _offset;
};
///
static const char* vertSource = {
#version 150\n
#extension GL_EXT_geometry_shader4 : enable\n
uniform float u_anim1;\n
varying vec4 v_color;\n
in int inIndex;\n
void main(void)\n
{\n
v_color = vec4(inIndex == 1234 ? 1.0 : 0.0, 0.0, 1.0, 1.0);\n // gl_Vertex;
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n
}\n
};
static const char* geomSource = {
#version 150\n
#extension GL_EXT_geometry_shader4 : enable\n
uniform float u_anim1;\n
varying in vec4 v_color[];\n
varying out vec4 v_color_out;\n
void main(void)\n
{\n
vec4 v = gl_PositionIn[0];\n
v_color_out = v_color[0];\n
\n
gl_Position = v + vec4(u_anim1,0.,0.,0.); EmitVertex();\n
gl_Position = v - vec4(u_anim1,0.,0.,0.); EmitVertex();\n
EndPrimitive();\n
\n
