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SurfaceRenderer.cpp
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SurfaceRenderer.cpp
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/***********************************************************************
SurfaceRenderer - Class to render a surface defined by a regular grid in
depth image space.
Copyright (c) 2012-2015 Oliver Kreylos
This file is part of the Augmented Reality Sandbox (SARndbox).
The Augmented Reality Sandbox is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Augmented Reality Sandbox is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with the Augmented Reality Sandbox; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***********************************************************************/
#include "SurfaceRenderer.h"
#include <string>
#include <vector>
#include <iostream>
#include <Misc/PrintInteger.h>
#include <Misc/ThrowStdErr.h>
#include <GL/gl.h>
#include <GL/GLVertexArrayParts.h>
#include <GL/Extensions/GLARBFragmentShader.h>
#include <GL/Extensions/GLARBMultitexture.h>
#include <GL/Extensions/GLARBShaderObjects.h>
#include <GL/Extensions/GLARBTextureFloat.h>
#include <GL/Extensions/GLARBTextureRectangle.h>
#include <GL/Extensions/GLARBTextureRg.h>
#include <GL/Extensions/GLARBVertexBufferObject.h>
#include <GL/Extensions/GLARBVertexShader.h>
#include <GL/Extensions/GLEXTFramebufferObject.h>
#include <GL/GLLightTracker.h>
#include <GL/GLContextData.h>
#include <GL/GLGeometryVertex.h>
#include "WaterTable2.h"
namespace {
/****************
Helper functions:
****************/
GLhandleARB compileVertexShader(const char* shaderFileName)
{
/* Construct the full shader source file name: */
std::string fullShaderFileName=SHADERDIR;
fullShaderFileName.push_back('/');
fullShaderFileName.append(shaderFileName);
fullShaderFileName.append(".vs");
/* Compile and return the vertex shader: */
return glCompileVertexShaderFromFile(fullShaderFileName.c_str());
}
GLhandleARB compileFragmentShader(const char* shaderFileName)
{
/* Construct the full shader source file name: */
std::string fullShaderFileName=SHADERDIR;
fullShaderFileName.push_back('/');
fullShaderFileName.append(shaderFileName);
fullShaderFileName.append(".fs");
/* Compile and return the fragment shader: */
return glCompileFragmentShaderFromFile(fullShaderFileName.c_str());
}
}
/******************************************
Methods of class SurfaceRenderer::DataItem:
******************************************/
SurfaceRenderer::DataItem::DataItem(void)
:vertexBuffer(0),indexBuffer(0),
depthTexture(0),depthTextureVersion(0),
depthShader(0),elevationShader(0),
contourLineFramebufferObject(0),contourLineDepthBufferObject(0),contourLineColorTextureObject(0),
heightMapShader(0),lightTrackerVersion(0),surfaceSettingsVersion(0),
globalAmbientHeightMapShader(0),shadowedIlluminatedHeightMapShader(0)
{
/* Check if all required extensions are supported: */
bool supported=GLARBFragmentShader::isSupported();
supported=supported&&GLARBMultitexture::isSupported();
supported=supported&&GLARBShaderObjects::isSupported();
supported=supported&&GLARBTextureRectangle::isSupported();
supported=supported&&GLARBTextureRg::isSupported();
supported=supported&&GLARBTextureFloat::isSupported();
supported=supported&&GLARBVertexBufferObject::isSupported();
supported=supported&&GLARBVertexShader::isSupported();
supported=supported&&GLEXTFramebufferObject::isSupported();
if(!supported)
Misc::throwStdErr("SurfaceRenderer: Not all required extensions are supported by local OpenGL");
/* Initialize all required extensions: */
GLARBFragmentShader::initExtension();
GLARBMultitexture::initExtension();
GLARBShaderObjects::initExtension();
GLARBTextureFloat::initExtension();
GLARBTextureRectangle::initExtension();
GLARBTextureRg::initExtension();
GLARBVertexBufferObject::initExtension();
GLARBVertexShader::initExtension();
GLEXTFramebufferObject::initExtension();
/* Allocate the buffers and textures: */
glGenBuffersARB(1,&vertexBuffer);
glGenBuffersARB(1,&indexBuffer);
glGenTextures(1,&depthTexture);
}
SurfaceRenderer::DataItem::~DataItem(void)
{
/* Release all allocated buffers, textures, and shaders: */
glDeleteBuffersARB(1,&vertexBuffer);
glDeleteBuffersARB(1,&indexBuffer);
glDeleteTextures(1,&depthTexture);
glDeleteObjectARB(depthShader);
glDeleteObjectARB(elevationShader);
glDeleteFramebuffersEXT(1,&contourLineFramebufferObject);
glDeleteRenderbuffersEXT(1,&contourLineDepthBufferObject);
glDeleteTextures(1,&contourLineColorTextureObject);
glDeleteObjectARB(heightMapShader);
glDeleteObjectARB(globalAmbientHeightMapShader);
glDeleteObjectARB(shadowedIlluminatedHeightMapShader);
}
/********************************
Methods of class SurfaceRenderer:
********************************/
void SurfaceRenderer::shaderSourceFileChanged(const IO::FileMonitor::Event& event)
{
/* Invalidate the single-pass surface shader: */
++surfaceSettingsVersion;
}
GLhandleARB SurfaceRenderer::createSinglePassSurfaceShader(const GLLightTracker& lt,GLint* uniformLocations) const
{
GLhandleARB result=0;
std::vector<GLhandleARB> shaders;
try
{
/*********************************************************************
Assemble and compile the surface rendering vertex shader:
*********************************************************************/
/* Assemble the function and declaration strings: */
std::string vertexFunctions="\
#extension GL_ARB_texture_rectangle : enable\n";
std::string vertexUniforms="\
uniform sampler2DRect depthSampler; // Sampler for the depth image-space elevation texture\n\
uniform mat4 depthProjection; // Transformation from depth image space to camera space\n";
std::string vertexVaryings;
/* Assemble the vertex shader's main function: */
std::string vertexMain="\
void main()\n\
{\n\
/* Get the vertex' depth image-space z coordinate from the texture: */\n\
vec4 vertexDic=gl_Vertex;\n\
vertexDic.z=texture2DRect(depthSampler,vertexDic.xy).r;\n\
\n\
/* Transform the vertex from depth image space to camera space: */\n\
vec4 vertexCc=depthProjection*vertexDic;\n\
\n";
if(useHeightMap)
{
/* Add declarations for height mapping: */
vertexUniforms+="\
uniform vec4 basePlane; // Plane equation of the base plane\n\
uniform vec2 heightColorMapTransformation; // Transformation from elevation to height color map texture coordinate\n";
vertexVaryings+="\
varying float heightColorMapTexCoord; // Texture coordinate for the height color map\n";
/* Add height mapping code to vertex shader's main function: */
vertexMain+="\
/* Plug camera-space vertex into the base plane equation: */\n\
float elevation=dot(basePlane,vertexCc)/vertexCc.w;\n\
\n\
/* Transform elevation to height color map texture coordinate: */\n\
heightColorMapTexCoord=elevation*heightColorMapTransformation.x+heightColorMapTransformation.y;\n\
\n";
}
if(illuminate)
{
/* Add declarations for illumination: */
vertexUniforms+="\
uniform mat4 tangentDepthProjection; // Transformation from depth image space to camera space for tangent planes\n";
vertexVaryings+="\
varying vec4 diffColor,specColor; // Diffuse and specular colors\n";
/* Add illumination code to vertex shader's main function: */
vertexMain+="\
/* Calculate the vertex' tangent plane equation in depth image space: */\n\
vec4 tangentDic;\n\
tangentDic.x=texture2DRect(depthSampler,vec2(vertexDic.x-1.0,vertexDic.y)).r-texture2DRect(depthSampler,vec2(vertexDic.x+1.0,vertexDic.y)).r;\n\
tangentDic.y=texture2DRect(depthSampler,vec2(vertexDic.x,vertexDic.y-1.0)).r-texture2DRect(depthSampler,vec2(vertexDic.x,vertexDic.y+1.0)).r;\n\
tangentDic.z=2.0;\n\
tangentDic.w=-dot(vertexDic.xyz,tangentDic.xyz)/vertexDic.w;\n\
\n\
/* Transform the vertex' tangent plane from depth image space to camera space: */\n\
vec3 normalCc=(tangentDepthProjection*tangentDic).xyz;\n\
\n\
/* Transform vertex and normal to eye coordinates for illumination: */\n\
vec4 vertexEc=gl_ModelViewMatrix*vertexCc;\n\
vec3 normalEc=normalize(gl_NormalMatrix*normalCc);\n\
\n\
/* Initialize the color accumulators: */\n\
diffColor=gl_LightModel.ambient*gl_FrontMaterial.ambient;\n\
specColor=vec4(0.0,0.0,0.0,0.0);\n\
\n";
/* Call the appropriate light accumulation function for every enabled light source: */
bool firstLight=true;
for(int lightIndex=0;lightIndex<lt.getMaxNumLights();++lightIndex)
if(lt.getLightState(lightIndex).isEnabled())
{
/* Create the light accumulation function: */
vertexFunctions.push_back('\n');
vertexFunctions+=lt.createAccumulateLightFunction(lightIndex);
if(firstLight)
{
vertexMain+="\
/* Call the light accumulation functions for all enabled light sources: */\n";
firstLight=false;
}
/* Call the light accumulation function from vertex shader's main function: */
vertexMain+="\
accumulateLight";
char liBuffer[12];
vertexMain.append(Misc::print(lightIndex,liBuffer+11));
vertexMain+="(vertexEc,normalEc,gl_FrontMaterial.ambient,gl_FrontMaterial.diffuse,gl_FrontMaterial.specular,gl_FrontMaterial.shininess,diffColor,specColor);\n";
}
if(!firstLight)
vertexMain+="\
\n";
}
if(waterTable!=0)
{
/* Add declarations for water handling: */
vertexUniforms+="\
uniform mat4 waterLevelTextureTransformation; // Transformation from camera space to water level texture coordinate space\n";
vertexVaryings+="\
varying vec2 waterLevelTexCoord; // Texture coordinate for water level texture\n";
/* Add water handling code to vertex shader's main function: */
vertexMain+="\
/* Transform the vertex from camera space to water level texture coordinate space: */\n\
vec4 wltc=waterLevelTextureTransformation*vertexCc;\n\
waterLevelTexCoord=wltc.xy/wltc.w;\n\
\n";
}
/* Finish the vertex shader's main function: */
vertexMain+="\
/* Transform vertex to clip coordinates: */\n\
gl_Position=gl_ModelViewProjectionMatrix*vertexCc;\n\
}\n";
/* Compile the vertex shader: */
shaders.push_back(glCompileVertexShaderFromStrings(7,vertexFunctions.c_str(),"\t\t\n",vertexUniforms.c_str(),"\t\t\n",vertexVaryings.c_str(),"\t\t\n",vertexMain.c_str()));
/*********************************************************************
Assemble and compile the surface rendering fragment shaders:
*********************************************************************/
/* Assemble the fragment shader's function declarations: */
std::string fragmentDeclarations;
/* Assemble the fragment shader's uniform and varying variables: */
std::string fragmentUniforms;
std::string fragmentVaryings;
/* Assemble the fragment shader's main function: */
std::string fragmentMain="\
void main()\n\
{\n";
if(useHeightMap)
{
/* Add declarations for height mapping: */
fragmentUniforms+="\
uniform sampler1D heightColorMapSampler;\n";
fragmentVaryings+="\
varying float heightColorMapTexCoord; // Texture coordinate for the height color map\n";
/* Add height mapping code to the fragment shader's main function: */
fragmentMain+="\
/* Get the fragment's color from the height color map: */\n\
vec4 baseColor=texture1D(heightColorMapSampler,heightColorMapTexCoord);\n\
\n";
}
else
{
fragmentMain+="\
/* Set the surface's base color to white: */\n\
vec4 baseColor=vec4(1.0,1.0,1.0,1.0);\n\
\n";
}
if(drawContourLines)
{
/* Declare the contour line function: */
fragmentDeclarations+="\
void addContourLines(in vec2,inout vec4);\n";
/* Compile the contour line shader: */
shaders.push_back(compileFragmentShader("SurfaceAddContourLines"));
/* Call contour line function from fragment shader's main function: */
fragmentMain+="\
/* Modulate the base color by contour line color: */\n\
addContourLines(gl_FragCoord.xy,baseColor);\n\
\n";
}
if(illuminate)
{
/* Declare the illumination function: */
fragmentDeclarations+="\
void illuminate(inout vec4);\n";
/* Compile the illumination shader: */
shaders.push_back(compileFragmentShader("SurfaceIlluminate"));
/* Call illumination function from fragment shader's main function: */
fragmentMain+="\
/* Apply illumination to the base color: */\n\
illuminate(baseColor);\n\
\n";
}
if(waterTable!=0)
{
/* Declare the water handling functions: */
fragmentDeclarations+="\
void addWaterColor(in vec2,inout vec4);\n\
void addWaterColorAdvected(inout vec4);\n";
/* Compile the water handling shader: */
shaders.push_back(compileFragmentShader("SurfaceAddWaterColor"));
/* Call water coloring function from fragment shader's main function: */
if(advectWaterTexture)
{
fragmentMain+="\
/* Modulate the base color with water color: */\n\
addWaterColorAdvected(baseColor);\n\
\n";
}
else
{
fragmentMain+="\
/* Modulate the base color with water color: */\n\
addWaterColor(gl_FragCoord.xy,baseColor);\n\
\n";
}
}
/* Finish the fragment shader's main function: */
fragmentMain+="\
/* Assign the final color to the fragment: */\n\
gl_FragColor=baseColor;\n\
}\n";
/* Compile the fragment shader: */
shaders.push_back(glCompileFragmentShaderFromStrings(7,fragmentDeclarations.c_str(),"\t\t\n",fragmentUniforms.c_str(),fragmentVaryings.c_str(),"\t\t\n","\t\t\n",fragmentMain.c_str()));
/* Link the shader program: */
result=glLinkShader(shaders);
/* Release all compiled shaders: */
for(std::vector<GLhandleARB>::iterator shIt=shaders.begin();shIt!=shaders.end();++shIt)
glDeleteObjectARB(*shIt);
/*******************************************************************
Query the shader program's uniform locations:
*******************************************************************/
GLint* ulPtr=uniformLocations;
/* Query common uniform variables: */
*(ulPtr++)=glGetUniformLocationARB(result,"depthSampler");
*(ulPtr++)=glGetUniformLocationARB(result,"depthProjection");
if(useHeightMap)
{
*(ulPtr++)=glGetUniformLocationARB(result,"basePlane");
*(ulPtr++)=glGetUniformLocationARB(result,"heightColorMapTransformation");
*(ulPtr++)=glGetUniformLocationARB(result,"heightColorMapSampler");
}
if(drawContourLines)
{
*(ulPtr++)=glGetUniformLocationARB(result,"pixelCornerElevationSampler");
*(ulPtr++)=glGetUniformLocationARB(result,"contourLineFactor");
}
if(illuminate)
{
/* Query illumination uniform variables: */
*(ulPtr++)=glGetUniformLocationARB(result,"tangentDepthProjection");
}
if(waterTable!=0)
{
/* Query water handling uniform variables: */
*(ulPtr++)=glGetUniformLocationARB(result,"waterLevelTextureTransformation");
*(ulPtr++)=glGetUniformLocationARB(result,"bathymetrySampler");
*(ulPtr++)=glGetUniformLocationARB(result,"quantitySampler");
*(ulPtr++)=glGetUniformLocationARB(result,"waterOpacity");
*(ulPtr++)=glGetUniformLocationARB(result,"waterAnimationTime");
}
}
catch(...)
{
/* Clean up and re-throw the exception: */
for(std::vector<GLhandleARB>::iterator shIt=shaders.begin();shIt!=shaders.end();++shIt)
glDeleteObjectARB(*shIt);
throw;
}
return result;
}
SurfaceRenderer::SurfaceRenderer(const unsigned int sSize[2],const SurfaceRenderer::PTransform& sDepthProjection,const SurfaceRenderer::Plane& sBasePlane)
:depthProjection(sDepthProjection),
basePlane(sBasePlane),
usePreboundDepthTexture(false),
drawContourLines(true),contourLineFactor(1.0f),
useHeightMap(true),heightMapScale(1.0f),heightMapOffset(0.0f),
illuminate(false),waterTable(0),advectWaterTexture(false),surfaceSettingsVersion(1),
waterOpacity(2.0f),
depthImageVersion(1),
animationTime(0.0)
{
/* Monitor the external shader source files: */
fileMonitor.addPath((std::string(SHADERDIR)+std::string("/SurfaceAddContourLines.fs")).c_str(),IO::FileMonitor::Modified,Misc::createFunctionCall(this,&SurfaceRenderer::shaderSourceFileChanged));
fileMonitor.addPath((std::string(SHADERDIR)+std::string("/SurfaceIlluminate.fs")).c_str(),IO::FileMonitor::Modified,Misc::createFunctionCall(this,&SurfaceRenderer::shaderSourceFileChanged));
fileMonitor.addPath((std::string(SHADERDIR)+std::string("/SurfaceAddWaterColor.fs")).c_str(),IO::FileMonitor::Modified,Misc::createFunctionCall(this,&SurfaceRenderer::shaderSourceFileChanged));
fileMonitor.startPolling();
/* Copy the depth image size: */
for(int i=0;i<2;++i)
size[i]=sSize[i];
/* Check if the depth projection matrix retains right-handedness: */
PTransform::Point p1=depthProjection.transform(PTransform::Point(0,0,0));
PTransform::Point p2=depthProjection.transform(PTransform::Point(1,0,0));
PTransform::Point p3=depthProjection.transform(PTransform::Point(0,1,0));
PTransform::Point p4=depthProjection.transform(PTransform::Point(0,0,1));
bool depthProjectionInverts=Geometry::cross(p2-p1,p3-p1)*(p4-p1)<Scalar(0);
/* Convert the depth projection matrix to column-major OpenGL format: */
GLfloat* dpmPtr=depthProjectionMatrix;
for(int j=0;j<4;++j)
for(int i=0;i<4;++i,++dpmPtr)
*dpmPtr=depthProjection.getMatrix()(i,j);
/* Calculate the tangent plane depth projection: */
PTransform tangentDepthProjection=Geometry::invert(depthProjection);
if(depthProjectionInverts)
tangentDepthProjection.leftMultiply(PTransform::scale(PTransform::Scale(-1,-1,-1)));
GLfloat* tdpmPtr=tangentDepthProjectionMatrix;
for(int i=0;i<4;++i)
for(int j=0;j<4;++j,++tdpmPtr)
*tdpmPtr=tangentDepthProjection.getMatrix()(i,j);
/* Convert the base plane to a homogeneous plane equation: */
for(int i=0;i<3;++i)
basePlaneEq[i]=GLfloat(basePlane.getNormal()[i]);
basePlaneEq[3]=GLfloat(-basePlane.getOffset());
/* Initialize the depth image: */
depthImage=Kinect::FrameBuffer(size[0],size[1],size[1]*size[0]*sizeof(float));
float* diPtr=static_cast<float*>(depthImage.getBuffer());
for(unsigned int y=0;y<size[1];++y)
for(unsigned int x=0;x<size[0];++x,++diPtr)
*diPtr=0.0f;
}
void SurfaceRenderer::initContext(GLContextData& contextData) const
{
/* Create a data item and add it to the context: */
DataItem* dataItem=new DataItem;
contextData.addDataItem(this,dataItem);
/* Upload the grid of template vertices into the vertex buffer: */
typedef GLGeometry::Vertex<void,0,void,0,void,float,3> Vertex;
glBindBufferARB(GL_ARRAY_BUFFER_ARB,dataItem->vertexBuffer);
glBufferDataARB(GL_ARRAY_BUFFER_ARB,size[1]*size[0]*sizeof(Vertex),0,GL_STATIC_DRAW_ARB);
Vertex* vPtr=static_cast<Vertex*>(glMapBufferARB(GL_ARRAY_BUFFER_ARB,GL_WRITE_ONLY_ARB));
for(unsigned int y=0;y<size[1];++y)
for(unsigned int x=0;x<size[0];++x,++vPtr)
{
vPtr->position[0]=float(x)+0.5f;
vPtr->position[1]=float(y)+0.5f;
vPtr->position[2]=0.0f;
}
glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
glBindBufferARB(GL_ARRAY_BUFFER_ARB,0);
/* Upload the surface's triangle indices into the index buffer: */
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,dataItem->indexBuffer);
glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB,(size[1]-1)*size[0]*2*sizeof(GLuint),0,GL_STATIC_DRAW_ARB);
GLuint* iPtr=static_cast<GLuint*>(glMapBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,GL_WRITE_ONLY_ARB));
for(unsigned int y=1;y<size[1];++y)
for(unsigned int x=0;x<size[0];++x,iPtr+=2)
{
iPtr[0]=GLuint(y*size[0]+x);
iPtr[1]=GLuint((y-1)*size[0]+x);
}
glUnmapBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB);
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,0);
/* Initialize the depth image texture: */
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->depthTexture);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_T,GL_CLAMP);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,0,GL_LUMINANCE32F_ARB,size[0],size[1],0,GL_LUMINANCE,GL_UNSIGNED_BYTE,0);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
/* Create the surface depth render shader: */
{
GLhandleARB vertexShader=compileVertexShader("SurfaceDepthShader");
GLhandleARB fragmentShader=compileFragmentShader("SurfaceDepthShader");
dataItem->depthShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->depthShaderUniforms[0]=glGetUniformLocationARB(dataItem->depthShader,"depthSampler");
dataItem->depthShaderUniforms[1]=glGetUniformLocationARB(dataItem->depthShader,"projectionModelviewDepthProjection");
}
/* Create the surface elevation render shader: */
{
GLhandleARB vertexShader=compileVertexShader("SurfaceElevationShader");
GLhandleARB fragmentShader=compileFragmentShader("SurfaceElevationShader");
dataItem->elevationShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->elevationShaderUniforms[0]=glGetUniformLocationARB(dataItem->elevationShader,"depthSampler");
dataItem->elevationShaderUniforms[1]=glGetUniformLocationARB(dataItem->elevationShader,"depthProjection");
dataItem->elevationShaderUniforms[2]=glGetUniformLocationARB(dataItem->elevationShader,"basePlane");
}
/* Create the height map render shader: */
dataItem->heightMapShader=createSinglePassSurfaceShader(*contextData.getLightTracker(),dataItem->heightMapShaderUniforms);
dataItem->surfaceSettingsVersion=surfaceSettingsVersion;
dataItem->lightTrackerVersion=contextData.getLightTracker()->getVersion();
/* Create the global ambient height map render shader: */
{
GLhandleARB vertexShader=compileVertexShader("SurfaceGlobalAmbientHeightMapShader");
GLhandleARB fragmentShader=compileFragmentShader("SurfaceGlobalAmbientHeightMapShader");
dataItem->globalAmbientHeightMapShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->globalAmbientHeightMapShaderUniforms[0]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"depthSampler");
dataItem->globalAmbientHeightMapShaderUniforms[1]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"depthProjection");
dataItem->globalAmbientHeightMapShaderUniforms[2]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"basePlane");
dataItem->globalAmbientHeightMapShaderUniforms[3]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"pixelCornerElevationSampler");
dataItem->globalAmbientHeightMapShaderUniforms[4]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"contourLineFactor");
dataItem->globalAmbientHeightMapShaderUniforms[5]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"heightColorMapSampler");
dataItem->globalAmbientHeightMapShaderUniforms[6]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"heightColorMapTransformation");
dataItem->globalAmbientHeightMapShaderUniforms[7]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"waterLevelSampler");
dataItem->globalAmbientHeightMapShaderUniforms[8]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"waterLevelTextureTransformation");
dataItem->globalAmbientHeightMapShaderUniforms[9]=glGetUniformLocationARB(dataItem->globalAmbientHeightMapShader,"waterOpacity");
}
/* Create the shadowed illuminated height map render shader: */
{
GLhandleARB vertexShader=compileVertexShader("SurfaceShadowedIlluminatedHeightMapShader");
GLhandleARB fragmentShader=compileFragmentShader("SurfaceShadowedIlluminatedHeightMapShader");
dataItem->shadowedIlluminatedHeightMapShader=glLinkShader(vertexShader,fragmentShader);
glDeleteObjectARB(vertexShader);
glDeleteObjectARB(fragmentShader);
dataItem->shadowedIlluminatedHeightMapShaderUniforms[0]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"depthSampler");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[1]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"depthProjection");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[2]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"tangentDepthProjection");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[3]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"basePlane");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[4]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"pixelCornerElevationSampler");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[5]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"contourLineFactor");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[6]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"heightColorMapSampler");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[7]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"heightColorMapTransformation");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[8]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"waterLevelSampler");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[9]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"waterLevelTextureTransformation");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[10]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"waterOpacity");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[11]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"shadowTextureSampler");
dataItem->shadowedIlluminatedHeightMapShaderUniforms[12]=glGetUniformLocationARB(dataItem->shadowedIlluminatedHeightMapShader,"shadowProjection");
}
}
void SurfaceRenderer::setUsePreboundDepthTexture(bool newUsePreboundDepthTexture)
{
usePreboundDepthTexture=newUsePreboundDepthTexture;
}
void SurfaceRenderer::setDrawContourLines(bool newDrawContourLines)
{
drawContourLines=newDrawContourLines;
++surfaceSettingsVersion;
}
void SurfaceRenderer::setContourLineDistance(GLfloat newContourLineDistance)
{
/* Set the new contour line factor: */
contourLineFactor=1.0f/newContourLineDistance;
}
void SurfaceRenderer::setUseHeightMap(bool newUseHeightMap)
{
useHeightMap=newUseHeightMap;
++surfaceSettingsVersion;
}
void SurfaceRenderer::setHeightMapRange(GLsizei newHeightMapSize,GLfloat newMinElevation,GLfloat newMaxElevation)
{
/* Calculate the new height map elevation scaling and offset coefficients: */
GLdouble hms=GLdouble(newHeightMapSize-1)/((newMaxElevation-newMinElevation)*GLdouble(newHeightMapSize));
GLdouble hmo=0.5/GLdouble(newHeightMapSize)-hms*newMinElevation;
heightMapScale=GLfloat(hms);
heightMapOffset=GLfloat(hmo);
}
void SurfaceRenderer::setIlluminate(bool newIlluminate)
{
illuminate=newIlluminate;
++surfaceSettingsVersion;
}
void SurfaceRenderer::setWaterTable(WaterTable2* newWaterTable)
{
waterTable=newWaterTable;
++surfaceSettingsVersion;
}
void SurfaceRenderer::setAdvectWaterTexture(bool newAdvectWaterTexture)
{
advectWaterTexture=false; // newAdvectWaterTexture;
++surfaceSettingsVersion;
}
void SurfaceRenderer::setWaterOpacity(GLfloat newWaterOpacity)
{
/* Set the new opacity factor: */
waterOpacity=newWaterOpacity;
}
void SurfaceRenderer::setDepthImage(const Kinect::FrameBuffer& newDepthImage)
{
/* Update the depth image: */
depthImage=newDepthImage;
++depthImageVersion;
}
void SurfaceRenderer::setAnimationTime(double newAnimationTime)
{
/* Set the new animation time: */
animationTime=newAnimationTime;
/* Poll the file monitor: */
fileMonitor.processEvents();
}
void SurfaceRenderer::glRenderDepthOnly(const SurfaceRenderer::PTransform& modelviewProjection,GLContextData& contextData) const
{
/* Get the data item: */
DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
/* Bind the depth rendering shader: */
glUseProgramObjectARB(dataItem->depthShader);
/* Bind the vertex and index buffers: */
glBindBufferARB(GL_ARRAY_BUFFER_ARB,dataItem->vertexBuffer);
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,dataItem->indexBuffer);
/* Set up the depth image texture: */
if(!usePreboundDepthTexture)
{
/* Bind the depth image texture: */
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->depthTexture);
/* Check if the texture is outdated: */
if(dataItem->depthTextureVersion!=depthImageVersion)
{
/* Upload the new depth texture: */
glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB,0,0,0,size[0],size[1],GL_LUMINANCE,GL_FLOAT,depthImage.getBuffer());
/* Mark the depth texture as current: */
dataItem->depthTextureVersion=depthImageVersion;
}
}
glUniform1iARB(dataItem->depthShaderUniforms[0],0);
/* Upload the combined projection, modelview, and depth projection matrix: */
PTransform pmvdp=modelviewProjection;
pmvdp*=depthProjection;
GLfloat pmvdpMatrix[16];
GLfloat* pmvdpPtr=pmvdpMatrix;
for(int j=0;j<4;++j)
for(int i=0;i<4;++i,++pmvdpPtr)
*pmvdpPtr=GLfloat(pmvdp.getMatrix()(i,j));
glUniformMatrix4fvARB(dataItem->depthShaderUniforms[1],1,GL_FALSE,pmvdpMatrix);
/* Draw the surface: */
typedef GLGeometry::Vertex<void,0,void,0,void,float,3> Vertex;
GLVertexArrayParts::enable(Vertex::getPartsMask());
glVertexPointer(static_cast<const Vertex*>(0));
for(unsigned int y=1;y<size[1];++y)
glDrawElements(GL_QUAD_STRIP,size[0]*2,GL_UNSIGNED_INT,static_cast<const GLuint*>(0)+(y-1)*size[0]*2);
GLVertexArrayParts::disable(Vertex::getPartsMask());
/* Unbind all textures and buffers: */
if(!usePreboundDepthTexture)
{
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
}
glBindBufferARB(GL_ARRAY_BUFFER_ARB,0);
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,0);
/* Unbind the depth rendering shader: */
glUseProgramObjectARB(0);
}
void SurfaceRenderer::glRenderElevation(GLContextData& contextData) const
{
/* Get the data item: */
DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
/* Bind the elevation shader: */
glUseProgramObjectARB(dataItem->elevationShader);
/* Bind the vertex and index buffers: */
glBindBufferARB(GL_ARRAY_BUFFER_ARB,dataItem->vertexBuffer);
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,dataItem->indexBuffer);
/* Set up the depth image texture: */
if(!usePreboundDepthTexture)
{
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->depthTexture);
/* Check if the texture is outdated: */
if(dataItem->depthTextureVersion!=depthImageVersion)
{
/* Upload the new depth texture: */
glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB,0,0,0,size[0],size[1],GL_LUMINANCE,GL_FLOAT,depthImage.getBuffer());
/* Mark the depth texture as current: */
dataItem->depthTextureVersion=depthImageVersion;
}
}
glUniform1iARB(dataItem->elevationShaderUniforms[0],0);
/* Upload the depth projection matrix: */
glUniformMatrix4fvARB(dataItem->elevationShaderUniforms[1],1,GL_FALSE,depthProjectionMatrix);
/* Upload the base plane equation: */
glUniformARB<4>(dataItem->elevationShaderUniforms[2],1,basePlaneEq);
/* Draw the surface: */
typedef GLGeometry::Vertex<void,0,void,0,void,float,3> Vertex;
GLVertexArrayParts::enable(Vertex::getPartsMask());
glVertexPointer(static_cast<const Vertex*>(0));
for(unsigned int y=1;y<size[1];++y)
glDrawElements(GL_QUAD_STRIP,size[0]*2,GL_UNSIGNED_INT,static_cast<const GLuint*>(0)+(y-1)*size[0]*2);
GLVertexArrayParts::disable(Vertex::getPartsMask());
/* Unbind all textures and buffers: */
if(!usePreboundDepthTexture)
{
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
}
glBindBufferARB(GL_ARRAY_BUFFER_ARB,0);
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,0);
/* Unbind the elevation shader: */
glUseProgramObjectARB(0);
}
void SurfaceRenderer::glPrepareContourLines(GLContextData& contextData) const
{
/* Get the data item: */
DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
/*********************************************************************
Prepare the half-pixel-offset frame buffer for subsequent per-fragment
Marching Squares contour line extraction.
*********************************************************************/
/* Query the current viewport: */
GLint viewport[4];
glGetIntegerv(GL_VIEWPORT,viewport);
/* Save the currently-bound frame buffer and clear color: */
GLint currentFrameBuffer;
glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT,¤tFrameBuffer);
GLfloat currentClearColor[4];
glGetFloatv(GL_COLOR_CLEAR_VALUE,currentClearColor);
/* Check if the contour line frame buffer needs to be created: */
if(dataItem->contourLineFramebufferObject==0)
{
/* Reset the frame buffer size: */
for(int i=0;i<2;++i)
dataItem->contourLineFramebufferSize[i]=0;
/* Create and bind the frame buffer object: */
glGenFramebuffersEXT(1,&dataItem->contourLineFramebufferObject);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->contourLineFramebufferObject);
/* Create a depth buffer for topographic contour line rendering: */
glGenRenderbuffersEXT(1,&dataItem->contourLineDepthBufferObject);
/* Generate a color texture object for topographic contour line rendering: */
glGenTextures(1,&dataItem->contourLineColorTextureObject);
}
else
{
/* Bind the frame buffer object: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,dataItem->contourLineFramebufferObject);
}
/* Check if the contour line frame buffer needs to be resized: */
if(dataItem->contourLineFramebufferSize[0]!=viewport[2]+1||dataItem->contourLineFramebufferSize[1]!=viewport[3]+1)
{
/* Update the frame buffer size: */
bool mustAttachBuffers=dataItem->contourLineFramebufferSize[0]==0&&dataItem->contourLineFramebufferSize[1]==0;
for(int i=0;i<2;++i)
dataItem->contourLineFramebufferSize[i]=viewport[2+i]+1;
/* Resize the topographic contour line rendering depth buffer: */
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT,dataItem->contourLineDepthBufferObject);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT,GL_DEPTH_COMPONENT,dataItem->contourLineFramebufferSize[0],dataItem->contourLineFramebufferSize[1]);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT,0);
/* Resize the topographic contour line rendering color texture: */
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->contourLineColorTextureObject);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_S,GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,GL_TEXTURE_WRAP_T,GL_CLAMP);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,0,GL_R32F,dataItem->contourLineFramebufferSize[0],dataItem->contourLineFramebufferSize[1],0,GL_LUMINANCE,GL_UNSIGNED_BYTE,0);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
if(mustAttachBuffers)
{
/* Attach the depth render buffer and color texture object to the contour line frame buffer: */
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,GL_DEPTH_ATTACHMENT_EXT,GL_RENDERBUFFER_EXT,dataItem->contourLineDepthBufferObject);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT,GL_TEXTURE_RECTANGLE_ARB,dataItem->contourLineColorTextureObject,0);
glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
glReadBuffer(GL_NONE);
}
}
/* Extend the viewport to render the corners of the final pixels: */
glViewport(0,0,viewport[2]+1,viewport[3]+1);
glClearColor(0.0f,0.0f,0.0f,1.0f);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
/* Adjust the projection matrix to render the corners of the final pixels: */
glMatrixMode(GL_PROJECTION);
glPushMatrix();
GLdouble proj[16];
glGetDoublev(GL_PROJECTION_MATRIX,proj);
GLdouble xs=GLdouble(viewport[2])/GLdouble(viewport[2]+1);
GLdouble ys=GLdouble(viewport[3])/GLdouble(viewport[3]+1);
for(int j=0;j<4;++j)
{
proj[j*4+0]*=xs;
proj[j*4+1]*=ys;
}
glLoadIdentity();
glMultMatrixd(proj);
/*********************************************************************
Render the surface's elevation into the half-pixel offset frame
buffer.
*********************************************************************/
/* Bind the elevation shader: */
glUseProgramObjectARB(dataItem->elevationShader);
/* Bind the vertex and index buffers: */
glBindBufferARB(GL_ARRAY_BUFFER_ARB,dataItem->vertexBuffer);
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,dataItem->indexBuffer);
/* Set up the depth image texture: */
if(!usePreboundDepthTexture)
{
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,dataItem->depthTexture);
/* Check if the texture is outdated: */
if(dataItem->depthTextureVersion!=depthImageVersion)
{
/* Upload the new depth texture: */
glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB,0,0,0,size[0],size[1],GL_LUMINANCE,GL_FLOAT,depthImage.getBuffer());
/* Mark the depth texture as current: */
dataItem->depthTextureVersion=depthImageVersion;
}
}
glUniform1iARB(dataItem->elevationShaderUniforms[0],0);
/* Upload the depth projection matrix: */
glUniformMatrix4fvARB(dataItem->elevationShaderUniforms[1],1,GL_FALSE,depthProjectionMatrix);
/* Upload the base plane equation: */
glUniformARB<4>(dataItem->elevationShaderUniforms[2],1,basePlaneEq);
/* Draw the surface: */
typedef GLGeometry::Vertex<void,0,void,0,void,float,3> Vertex;
GLVertexArrayParts::enable(Vertex::getPartsMask());
glVertexPointer(static_cast<const Vertex*>(0));
for(unsigned int y=1;y<size[1];++y)
glDrawElements(GL_QUAD_STRIP,size[0]*2,GL_UNSIGNED_INT,static_cast<const GLuint*>(0)+(y-1)*size[0]*2);
GLVertexArrayParts::disable(Vertex::getPartsMask());
/* Unbind all textures and buffers: */
if(!usePreboundDepthTexture)
{
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,0);
}
glBindBufferARB(GL_ARRAY_BUFFER_ARB,0);
glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB,0);
/* Unbind the elevation shader: */
glUseProgramObjectARB(0);
/*********************************************************************
Restore previous OpenGL state.
*********************************************************************/
/* Restore the original viewport and projection matrix: */
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glViewport(viewport[0],viewport[1],viewport[2],viewport[3]);
/* Restore the original clear color and frame buffer binding: */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,currentFrameBuffer);
glClearColor(currentClearColor[0],currentClearColor[1],currentClearColor[2],currentClearColor[3]);
}
void SurfaceRenderer::glRenderSinglePass(GLuint heightColorMapTexture,GLContextData& contextData) const
{
/* Get the data item: */
DataItem* dataItem=contextData.retrieveDataItem<DataItem>(this);
/* Check if contour line rendering is enabled: */
if(drawContourLines)
{
/* Run the first rendering pass to create a half-pixel offset texture of surface elevations: */
glPrepareContourLines(contextData);
}
else if(dataItem->contourLineFramebufferObject!=0)
{
/* Delete the contour line rendering frame buffer: */
glDeleteFramebuffersEXT(1,&dataItem->contourLineFramebufferObject);
dataItem->contourLineFramebufferObject=0;
glDeleteRenderbuffersEXT(1,&dataItem->contourLineDepthBufferObject);
dataItem->contourLineDepthBufferObject=0;
glDeleteTextures(1,&dataItem->contourLineColorTextureObject);
dataItem->contourLineColorTextureObject=0;
}
/* Check if the single-pass surface shader is outdated: */
if(dataItem->surfaceSettingsVersion!=surfaceSettingsVersion||dataItem->lightTrackerVersion!=contextData.getLightTracker()->getVersion())
{
/* Rebuild the shader: */
try
{
GLhandleARB newShader=createSinglePassSurfaceShader(*contextData.getLightTracker(),dataItem->heightMapShaderUniforms);
glDeleteObjectARB(dataItem->heightMapShader);
dataItem->heightMapShader=newShader;
}