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Removed setVoxel() function from BlockVolumeIterator and added setVoxelAt() function to BlockVolume.h

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Improved OpenGL example.
This commit is contained in:
David Williams
2009-03-12 21:48:14 +00:00
parent 7100e558f3
commit 0f4a4c0e2b
7 changed files with 148 additions and 114 deletions
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160
examples/OpenGL/main.cpp
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@ -1,5 +1,4 @@
#include "PolyVoxCore/BlockVolume.h"
#include "PolyVoxCore/BlockVolumeIterator.h"
#include "PolyVoxCore/IndexedSurfacePatch.h"
#include "PolyVoxCore/SurfaceExtractors.h"
#include "PolyVoxCore/Utility.h"
@ -15,6 +14,7 @@ using namespace std;
//Global variables are easier for demonstration purposes, especially
//as I'm not sure how/if I can pass variables to the GLUT functions.
//Global variables are denoted by the 'g_' prefix
const uint16 g_uVolumeSideLength = 128;
const uint16 g_uRegionSideLength = 16;
const uint16 g_uVolumeSideLengthInRegions = g_uVolumeSideLength / g_uRegionSideLength;
@ -27,51 +27,50 @@ IndexedSurfacePatch* g_ispRegionSurfaces[g_uVolumeSideLengthInRegions][g_uVolume
void createSphereInVolume(void)
{
//Create an iterator to access data in the volume
BlockVolumeIterator<uint8> volIter(g_volData);
//This vector hold the position of the center of the volume
Vector3DFloat v3dVolCenter(g_volData.getSideLength() / 2, g_volData.getSideLength() / 2, g_volData.getSideLength() / 2);
//A region corresponding to the whole volume
const Region& regWholeVolume = g_volData.getEnclosingRegion();
//This iterator will iterate over the whole volume
volIter.setValidRegion(regWholeVolume);
//Start at the begining
volIter.setPosition(static_cast<Vector3DInt16>(regWholeVolume.getLowerCorner()));
do
//This three-level for loop iterates over every voxel in the volume
for (int z = 0; z < g_volData.getSideLength(); z++)
{
Vector3DFloat v3dPos(volIter.getPosX(), volIter.getPosY(), volIter.getPosZ());
Vector3DFloat v3dVolCenter(g_uVolumeSideLength / 2, g_uVolumeSideLength / 2, g_uVolumeSideLength / 2);
float fDistToCenter = (v3dPos - v3dVolCenter).length();
if(fDistToCenter <= 50.0f)
for (int y = 0; y < g_volData.getSideLength(); y++)
{
volIter.setVoxel(static_cast<uint8>(fDistToCenter));
}
else
{
volIter.setVoxel(0);
}
for (int x = 0; x < g_volData.getSideLength(); x++)
{
//Store our current position as a vector...
Vector3DFloat v3dCurrentPos(x,y,z);
//And compute how far the current position is from the center of the volume
float fDistToCenter = (v3dCurrentPos - v3dVolCenter).length();
}while (volIter.moveForwardInRegionXYZ()); //In our case this covers the whole volume
//If the current voxel is less than 50 units from the center,
//then we make it solid, otherwise we make it empty space.
if(fDistToCenter <= 50.0f)
{
g_volData.setVoxelAt(x,y,z, static_cast<uint8>(fDistToCenter));
}
else
{
g_volData.setVoxelAt(x,y,z, 0);
}
}
}
}
}
void init ( GLvoid ) // Create Some Everyday Functions
{
glShadeModel(GL_SMOOTH); // Enable Smooth Shading
glShadeModel(GL_SMOOTH); // Enable Smooth Shading
glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background
glClearDepth(1.0f); // Depth Buffer Setup
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
glEnable ( GL_COLOR_MATERIAL );
glEnable ( GL_COLOR_MATERIAL );
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
}
void display ( void ) // Create The Display Function
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
glLoadIdentity(); // Reset The Current Modelview Matrix
glTranslatef(-g_uVolumeSideLength/2,-g_uVolumeSideLength/2,-200.0f);
@ -98,80 +97,99 @@ void display ( void ) // Create The Display Function
glEnd();
glutSwapBuffers ( );
// Swap The Buffers To Not Be Left With A Clear Screen
glutSwapBuffers ( );
// Swap The Buffers To Not Be Left With A Clear Screen
}
void reshape ( int w, int h ) // Create The Reshape Function (the viewport)
{
glViewport ( 0, 0, w, h );
glMatrixMode ( GL_PROJECTION ); // Select The Projection Matrix
glLoadIdentity ( ); // Reset The Projection Matrix
if ( h==0 ) // Calculate The Aspect Ratio Of The Window
gluPerspective ( 80, ( float ) w, 1.0, 5000.0 );
else
gluPerspective ( 80, ( float ) w / ( float ) h, 1.0, 5000.0 );
glMatrixMode ( GL_MODELVIEW ); // Select The Model View Matrix
glLoadIdentity ( ); // Reset The Model View Matrix
glViewport ( 0, 0, w, h );
glMatrixMode ( GL_PROJECTION ); // Select The Projection Matrix
glLoadIdentity ( ); // Reset The Projection Matrix
if ( h==0 ) // Calculate The Aspect Ratio Of The Window
gluPerspective ( 80, ( float ) w, 1.0, 5000.0 );
else
gluPerspective ( 80, ( float ) w / ( float ) h, 1.0, 5000.0 );
glMatrixMode ( GL_MODELVIEW ); // Select The Model View Matrix
glLoadIdentity ( ); // Reset The Model View Matrix
}
void keyboard ( unsigned char key, int x, int y ) // Create Keyboard Function
{
switch ( key ) {
case 27: // When Escape Is Pressed...
exit ( 0 ); // Exit The Program
break; // Ready For Next Case
default: // Now Wrap It Up
break;
}
switch ( key ) {
case 27: // When Escape Is Pressed...
exit ( 0 ); // Exit The Program
break; // Ready For Next Case
default: // Now Wrap It Up
break;
}
}
void arrow_keys ( int a_keys, int x, int y ) // Create Special Function (required for arrow keys)
{
switch ( a_keys ) {
case GLUT_KEY_UP: // When Up Arrow Is Pressed...
glutFullScreen ( ); // Go Into Full Screen Mode
break;
case GLUT_KEY_DOWN: // When Down Arrow Is Pressed...
glutReshapeWindow ( 500, 500 ); // Go Into A 500 By 500 Window
break;
default:
break;
}
switch ( a_keys ) {
case GLUT_KEY_UP: // When Up Arrow Is Pressed...
glutFullScreen ( ); // Go Into Full Screen Mode
break;
case GLUT_KEY_DOWN: // When Down Arrow Is Pressed...
glutReshapeWindow ( 500, 500 ); // Go Into A 500 By 500 Window
break;
default:
break;
}
}
void main ( int argc, char** argv ) // Create Main Function For Bringing It All Together
{
//Make our volume contain a sphere in the center.
createSphereInVolume();
//Our volume is broken down into cuboid regions, and we create one mesh for each region.
//This three-level for loop iterates over each region.
for(uint16 uRegionZ = 0; uRegionZ < g_uVolumeSideLengthInRegions; ++uRegionZ)
{
for(uint16 uRegionY = 0; uRegionY < g_uVolumeSideLengthInRegions; ++uRegionY)
{
for(uint16 uRegionX = 0; uRegionX < g_uVolumeSideLengthInRegions; ++uRegionX)
{
//Create a new surface patch (which is basiaclly the PolyVox term for a mesh).
g_ispRegionSurfaces[uRegionX][uRegionY][uRegionZ] = new IndexedSurfacePatch();
IndexedSurfacePatch* ispCurrent = g_ispRegionSurfaces[uRegionX][uRegionY][uRegionZ];
Vector3DInt32 regLowerCorner(uRegionX * g_uRegionSideLength, uRegionY * g_uRegionSideLength, uRegionZ * g_uRegionSideLength);
Vector3DInt32 regUpperCorner((uRegionX + 1) * g_uRegionSideLength, (uRegionY + 1) * g_uRegionSideLength, (uRegionZ + 1) * g_uRegionSideLength);
//Compute the extents of the current region
//FIXME - This is a little coplex? PolyVox could
//provide more functions for dealing with regions?
uint16 regionStartX = uRegionX * g_uRegionSideLength;
uint16 regionStartY = uRegionY * g_uRegionSideLength;
uint16 regionStartZ = uRegionZ * g_uRegionSideLength;
uint16 regionEndX = regionStartX + g_uRegionSideLength;
uint16 regionEndY = regionStartY + g_uRegionSideLength;
uint16 regionEndZ = regionStartZ + g_uRegionSideLength;
Vector3DInt32 regLowerCorner(regionStartX, regionStartY, regionStartZ);
Vector3DInt32 regUpperCorner(regionEndX, regionEndY, regionEndZ);
//Extract the surface for this region
extractReferenceSurface(&g_volData, Region(regLowerCorner, regUpperCorner), ispCurrent);
}
}
}
glutInit ( &argc, argv ); // Erm Just Write It =)
init ();
glutInitDisplayMode ( GLUT_RGB | GLUT_DOUBLE ); // Display Mode
glutInitWindowSize ( 500, 500 ); // If glutFullScreen wasn't called this is the window size
glutCreateWindow ( "PolyVox OpenGL Example" ); // Window Title (argv[0] for current directory as title)
//glutFullScreen ( ); // Put Into Full Screen
glutDisplayFunc ( display ); // Matching Earlier Functions To Their Counterparts
glutReshapeFunc ( reshape );
glutKeyboardFunc ( keyboard );
glutSpecialFunc ( arrow_keys );
glutMainLoop ( ); // Initialize The Main Loop
glutInit ( &argc, argv ); // Erm Just Write It =)
init ();
glutInitDisplayMode ( GLUT_RGB | GLUT_DOUBLE ); // Display Mode
glutInitWindowSize ( 500, 500 ); // If glutFullScreen wasn't called this is the window size
glutCreateWindow ( "PolyVox OpenGL Example" ); // Window Title (argv[0] for current directory as title)
//glutFullScreen ( ); // Put Into Full Screen
glutDisplayFunc ( display ); // Matching Earlier Functions To Their Counterparts
glutReshapeFunc ( reshape );
glutKeyboardFunc ( keyboard );
glutSpecialFunc ( arrow_keys );
glutMainLoop ( ); // Initialize The Main Loop
for(uint16 uRegionZ = 0; uRegionZ < g_uVolumeSideLengthInRegions; ++uRegionZ)
//Delete all the surface patches we created.
for(uint16 uRegionZ = 0; uRegionZ < g_uVolumeSideLengthInRegions; ++uRegionZ)
{
for(uint16 uRegionY = 0; uRegionY < g_uVolumeSideLengthInRegions; ++uRegionY)
{