Hi,
I would like to write the output/buffer of fragment shader to texture (RTT) as
I wish (e.g. all red), however this result is depending of the model's shapes
visible in the scene. How can I proceed with this correctly?
Follow below my minimal source code and the results.
Thanks in advance!
Expected:
[Image: http://forum.openscenegraph.org/files/expected_964.jpg ]
Current:
[Image: http://forum.openscenegraph.org/files/current_875.jpg ]
Code:
#include
#include
#include
#include
#include
#include
#include
#include
static const char *mrtVertSource = {
"#version 130\n"
"out vec3 worldNormal;\n"
"void main(void)\n"
"{\n"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
" worldNormal = normalize(gl_NormalMatrix * gl_Normal);\n"
" gl_TexCoord[0] = gl_MultiTexCoord0;\n"
"}\n"};
static const char *mrtFragSource = {
"#version 130\n"
"in vec3 worldNormal;\n"
"void main(void)\n"
"{\n"
" gl_FragData[0] = vec4(worldNormal, 0.0);\n"
"}\n"};
osg::Geode *createScreenQuad(float width, float height, float scale = 1.0f)
{
osg::Geometry *geom = osg::createTexturedQuadGeometry(
osg::Vec3(), osg::Vec3(width, 0.0f, 0.0f), osg::Vec3(0.0f, height,
0.0f),
0.0f, 0.0f, width * scale, height * scale);
osg::ref_ptr quad = new osg::Geode;
quad->addDrawable(geom);
int values = osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED;
quad->getOrCreateStateSet()->setAttribute(
new osg::PolygonMode(osg::PolygonMode::FRONT_AND_BACK,
osg::PolygonMode::FILL), values);
quad->getOrCreateStateSet()->setMode(GL_LIGHTING, values);
return quad.release();
}
osg::Camera *createRTTCamera(osg::Camera::BufferComponent buffer, osg::Texture
*tex)
{
osg::ref_ptr camera = new osg::Camera;
camera->setClearColor(osg::Vec4());
camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
camera->setRenderOrder(osg::Camera::PRE_RENDER);
camera->setViewport(0, 0, tex->getTextureWidth(), tex->getTextureHeight());
camera->attach(buffer, tex);
return camera.release();
}
osg::Camera *createHUDCamera(double left, double right, double bottom, double
top)
{
osg::ref_ptr camera = new osg::Camera;
camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
camera->setClearMask(GL_DEPTH_BUFFER_BIT);
camera->setRenderOrder(osg::Camera::POST_RENDER);
camera->setAllowEventFocus(false);
camera->setProjectionMatrix(osg::Matrix::ortho2D(left, right, bottom, top));
camera->getOrCreateStateSet()->setMode(GL_LIGHTING,
osg::StateAttribute::OFF);
return camera.release();
}
osg::TextureRectangle *createFloatTexture(uint w, uint h)
{
osg::ref_ptr tex2D = new osg::TextureRectangle;
tex2D->setTextureSize(w, h);
tex2D->setInternalFormat(GL_RGB32F_ARB);
tex2D->setSourceFormat(GL_RGBA);
tex2D->setSourceType(GL_FLOAT);
tex2D->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
tex2D->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
return tex2D.release();
}
int main(int argc, char **argv)
{
osg::ref_ptr scene =
osgDB::readNodeFile("/home/romulo/Tools/OpenSceneGraph-Data/cow.osg");
unsigned int w = 800, h = 800;
osg::Texture *normalTex = createFloatTexture(w, h);
osg::ref_ptr rttCamera =
createRTTCamera(osg::Camera::COLOR_BUFFER0, normalTex);
rttCamera->addChild(scene.get());
osg::ref_ptr program = new osg::Program;
program->addShader(new osg::Shader(osg::Shader::VERTEX, mrtVertSource));
program->addShader(new osg::Shader(osg::Shader::FRAGMENT, mrtFragSource));
rttCamera->getOrCreateStateSet()->setAttributeAndModes(program.get(),
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
rttCamera->getOrCreateStateSet()->addUniform(new osg::Uniform("defaultTex",
0));
osg::ref_ptr hudCamera = createHUDCamera(0.0, 1.0, 0.0, 1.0);
hudCamera->addChild(createScreenQuad(1.f, 1.0f, w));
hudCamera->getOrCreateStateSet()->setTextureAttributeAndModes(0, normalTex);
osg::ref_ptr root = new osg::Group;
root->addChild(rttCamera.get());
root->addChild(hudCamera.get());
root->addChild(scene.get());
osgViewer::Viewer viewer;
viewer.setUpViewInWindow(0, 0, w, h);
viewer.setSceneData(root.get());
return viewer.run();
}
Rômulo
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http://forum.openscenegraph.org/viewtopic.php?p=74467#74467
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