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From Christian Buchner, "I am hereby amending the osgforest sample with some code (functionally

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equivalent to the GLSL shaders sample) that displays the forest with
shaders on Intel 945 GM hardware. This card supports OpenGL 1.4 and
ARB_fragment/vertex_program only.

I would be pleased if this change made it into the official set of
examples, as it illustrates the use of ARB shaders quite nicely. I did
not find any other example covering this topic."
This commit is contained in:
Robert Osfield 2009-02-19 16:58:05 +00:00
parent 296b859d37
commit 4d0a3444be
1 changed files with 69 additions and 8 deletions
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77
examples/osgforest/osgforest.cpp
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@ -32,6 +32,8 @@
#include <osg/Switch>
#include <osg/Texture2D>
#include <osg/TexEnv>
#include <osg/VertexProgram>
#include <osg/FragmentProgram>
#include <osgDB/ReadFile>
#include <osgDB/FileUtils>
@ -48,6 +50,7 @@
#include <osgGA/StateSetManipulator>
#include <iostream>
#include <sstream>
// for the grid data..
#include "../osghangglide/terrain_coords.h"
@ -327,7 +330,7 @@ bool ForestTechniqueManager::Cell::divide(bool xAxis, bool yAxis, bool zAxis)
void ForestTechniqueManager::Cell::bin()
{
// put trees in apprpriate cells.
// put trees in appropriate cells.
TreeList treesNotAssigned;
for(TreeList::iterator titr=_trees.begin();
titr!=_trees.end();
@ -967,6 +970,7 @@ osg::Node* ForestTechniqueManager::createScene(unsigned int numTreesToCreates)
osg::StateSet *dstate = new osg::StateSet;
{
dstate->setTextureAttributeAndModes(0, tex, osg::StateAttribute::ON );
dstate->setTextureAttribute(0, new osg::TexEnv );
dstate->setAttributeAndModes( new osg::BlendFunc, osg::StateAttribute::ON );
@ -1005,19 +1009,77 @@ osg::Node* ForestTechniqueManager::createScene(unsigned int numTreesToCreates)
std::cout<<"Creating osg::MatrixTransform based forest...";
osg::Group* group = new osg::Group;
group->addChild(createTransformGraph(cell.get(),dstate));
group->addChild(createHUDWithText("Using osg::MatrixTransform's to create a forest\n\nPress left cursor key to select double quad based forest\nPress right cursor key to select OpenGL shader based forest"));
group->addChild(createHUDWithText("Using osg::MatrixTransform's to create a forest\n\nPress left cursor key to select double quad based forest\nPress right cursor key to select osg::Vertex/FragmentProgram based forest"));
_techniqueSwitch->addChild(group);
std::cout<<"done."<<std::endl;
}
{
std::cout<<"Creating osg::Vertex/FragmentProgram based forest...";
osg::Group* group = new osg::Group;
osg::StateSet* stateset = new osg::StateSet;
osg::StateSet* stateset = new osg::StateSet(*dstate, osg::CopyOp::DEEP_COPY_ALL);
stateset->setTextureAttributeAndModes(0, tex, osg::StateAttribute::ON );
stateset->setRenderingHint( osg::StateSet::TRANSPARENT_BIN );
{
// vertex program
std::ostringstream vp_oss;
vp_oss <<
"!!ARBvp1.0\n"
"ATTRIB vpos = vertex.position;\n"
"ATTRIB vcol = vertex.color;\n"
"ATTRIB tc = vertex.texcoord[" << 0 << "];"
"PARAM mvp[4] = { state.matrix.mvp };\n"
"PARAM one = { 1.0, 1.0, 1.0, 1.0 };"
"TEMP position;\n"
// vec3 position = gl_Vertex.xyz * gl_Color.w + gl_Color.xyz;
"MAD position, vpos, vcol.w, vcol;\n"
// gl_Position = gl_ModelViewProjectionMatrix * vec4(position,1.0);
"MOV position.w, one;\n"
"DP4 result.position.x, mvp[0], position;\n"
"DP4 result.position.y, mvp[1], position;\n"
"DP4 result.position.z, mvp[2], position;\n"
"DP4 result.position.w, mvp[3], position;\n"
// gl_FrontColor = vec4(1.0,1.0,1.0,1.0);
"MOV result.color.front.primary, one;\n"
// texcoord = gl_MultiTexCoord0.st;
"MOV result.texcoord, tc;\n"
"END\n";
// fragment program
std::ostringstream fp_oss;
fp_oss <<
"!!ARBfp1.0\n"
"TEX result.color, fragment.texcoord[" << 0 << "], texture[" << 0 << "], 2D;"
"END\n";
osg::ref_ptr<osg::VertexProgram> vp = new osg::VertexProgram;
vp->setVertexProgram(vp_oss.str());
stateset->setAttributeAndModes(vp.get(), osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
osg::ref_ptr<osg::FragmentProgram> fp = new osg::FragmentProgram;
fp->setFragmentProgram(fp_oss.str());
stateset->setAttributeAndModes(fp.get(), osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
}
group->addChild(createShaderGraph(cell.get(),stateset));
group->addChild(createHUDWithText("Using osg::Vertex/FragmentProgram to create a forest\n\nPress left cursor key to select osg::MatrixTransform's based forest\nPress right cursor key to select OpenGL shader based forest"));
_techniqueSwitch->addChild(group);
std::cout<<"done."<<std::endl;
}
{
std::cout<<"Creating OpenGL shader based forest...";
osg::Group* group = new osg::Group;
osg::StateSet* stateset = new osg::StateSet(*dstate, osg::CopyOp::DEEP_COPY_ALL);
{
osg::Program* program = new osg::Program;
@ -1069,9 +1131,8 @@ osg::Node* ForestTechniqueManager::createScene(unsigned int numTreesToCreates)
stateset->addUniform(baseTextureSampler);
}
std::cout<<"Creating OpenGL shader based forest...";
group->addChild(createShaderGraph(cell.get(),stateset));
group->addChild(createHUDWithText("Using OpenGL Shader to create a forest\n\nPress left cursor key to select osg::MatrixTransform based forest\nPress right cursor key to select osg::Billboard based forest"));
group->addChild(createHUDWithText("Using OpenGL Shader to create a forest\n\nPress left cursor key to select osg::Vertex/FragmentProgram based forest\nPress right cursor key to select osg::Billboard based forest"));
_techniqueSwitch->addChild(group);
std::cout<<"done."<<std::endl;
}