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Work on new OpenGL example - Work on immediate mode.

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This commit is contained in:
David Williams 2009-03-16 21:33:56 +00:00
parent 3e483c4355
commit 93e90b6031
1 changed files with 29 additions and 14 deletions
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37
examples/OpenGL/main.cpp
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@ -5,18 +5,18 @@
#include <windows.h> // Standard Header For Most Programs #include <windows.h> // Standard Header For Most Programs
//#define USE_OPENGL_IMMEDIATE_MODE //#define USE_OPENGL_VERTEX_BUFFERS_OBJECTS
#ifdef USE_OPENGL_IMMEDIATE_MODE #ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
#include <gl/gl.h>
#include <gl/glut.h>
#else
#ifdef WIN32 #ifdef WIN32
#include "glew/glew.h" #include "glew/glew.h"
#else #else
#include <gl/gl.h> // The GL Header File #include <gl/gl.h> // The GL Header File
#endif #endif
#include <gl/glut.h> // The GL Utility Toolkit (Glut) Header #include <gl/glut.h> // The GL Utility Toolkit (Glut) Header]
#else
#include <gl/gl.h>
#include <gl/glut.h>
#endif #endif
#include <iostream> #include <iostream>
@ -27,17 +27,19 @@ using namespace std;
using namespace PolyVox; using namespace PolyVox;
using namespace std; using namespace std;
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
struct OpenGLSurfacePatch struct OpenGLSurfacePatch
{ {
GLulong noOfIndices; GLulong noOfIndices;
GLuint indexBuffer; GLuint indexBuffer;
GLuint vertexBuffer; GLuint vertexBuffer;
}; };
#endif
//Global variables are easier for demonstration purposes, especially //Global variables are easier for demonstration purposes, especially
//as I'm not sure how/if I can pass variables to the GLUT functions. //as I'm not sure how/if I can pass variables to the GLUT functions.
//Global variables are denoted by the 'g_' prefix //Global variables are denoted by the 'g_' prefix
const uint16 g_uVolumeSideLength = 128; const uint16 g_uVolumeSideLength = 256;
const uint16 g_uRegionSideLength = 16; const uint16 g_uRegionSideLength = 16;
const uint16 g_uVolumeSideLengthInRegions = g_uVolumeSideLength / g_uRegionSideLength; const uint16 g_uVolumeSideLengthInRegions = g_uVolumeSideLength / g_uRegionSideLength;
@ -52,9 +54,13 @@ int g_frameCounter = 0;
BlockVolume<uint8> g_volData(logBase2(g_uVolumeSideLength)); BlockVolume<uint8> g_volData(logBase2(g_uVolumeSideLength));
//Rather than storing one big mesh, the volume is broken into regions and a mesh is stored for each region //Rather than storing one big mesh, the volume is broken into regions and a mesh is stored for each region
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
OpenGLSurfacePatch g_openGLSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions]; OpenGLSurfacePatch g_openGLSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions];
#else
IndexedSurfacePatch* g_indexedSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions]; IndexedSurfacePatch* g_indexedSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions];
#endif
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
OpenGLSurfacePatch BuildOpenGLSurfacePatch(IndexedSurfacePatch& isp) OpenGLSurfacePatch BuildOpenGLSurfacePatch(IndexedSurfacePatch& isp)
{ {
OpenGLSurfacePatch result; OpenGLSurfacePatch result;
@ -146,6 +152,7 @@ OpenGLSurfacePatch BuildOpenGLSurfacePatch(IndexedSurfacePatch& isp)
return result; return result;
} }
#endif
void createSphere(float fRadius, uint8 uValue) void createSphere(float fRadius, uint8 uValue)
{ {
@ -237,7 +244,8 @@ void display ( void ) // Create The Display Function
{ {
for(uint16 uRegionX = 0; uRegionX < g_uVolumeSideLengthInRegions; ++uRegionX) for(uint16 uRegionX = 0; uRegionX < g_uVolumeSideLengthInRegions; ++uRegionX)
{ {
/*glBindBuffer(GL_ARRAY_BUFFER, g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ].vertexBuffer); #ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
glBindBuffer(GL_ARRAY_BUFFER, g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ].vertexBuffer);
glVertexPointer(3, GL_FLOAT, 36, 0); glVertexPointer(3, GL_FLOAT, 36, 0);
glNormalPointer(GL_FLOAT, 36, (GLvoid*)12); glNormalPointer(GL_FLOAT, 36, (GLvoid*)12);
glColorPointer(3, GL_FLOAT, 36, (GLvoid*)24); glColorPointer(3, GL_FLOAT, 36, (GLvoid*)24);
@ -252,8 +260,9 @@ void display ( void ) // Create The Display Function
glDisableClientState(GL_COLOR_ARRAY); glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY); glDisableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY); */ glDisableClientState(GL_VERTEX_ARRAY);
#else
IndexedSurfacePatch* ispCurrent = g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ]; IndexedSurfacePatch* ispCurrent = g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ];
const vector<SurfaceVertex>& vecVertices = ispCurrent->getVertices(); const vector<SurfaceVertex>& vecVertices = ispCurrent->getVertices();
@ -311,6 +320,7 @@ void display ( void ) // Create The Display Function
} }
glEnd(); glEnd();
#endif
} }
} }
} }
@ -401,6 +411,7 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
glutTimerFunc(1000, timerFunc, 0); glutTimerFunc(1000, timerFunc, 0);
glutIdleFunc(idle); glutIdleFunc(idle);
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
#ifdef WIN32 #ifdef WIN32
//If we are on Windows we will need GLEW to access recent OpenGL functionality //If we are on Windows we will need GLEW to access recent OpenGL functionality
GLenum err = glewInit(); GLenum err = glewInit();
@ -409,6 +420,7 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
/* Problem: glewInit failed, something is seriously wrong. */ /* Problem: glewInit failed, something is seriously wrong. */
cout << "Error: " << glewGetErrorString(err) << endl; cout << "Error: " << glewGetErrorString(err) << endl;
} }
#endif
#endif #endif
//Make our volume contain a sphere in the center. //Make our volume contain a sphere in the center.
@ -437,8 +449,7 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
for(uint16 uRegionX = 0; uRegionX < g_uVolumeSideLengthInRegions; ++uRegionX) for(uint16 uRegionX = 0; uRegionX < g_uVolumeSideLengthInRegions; ++uRegionX)
{ {
//Create a new surface patch (which is basiaclly the PolyVox term for a mesh). //Create a new surface patch (which is basiaclly the PolyVox term for a mesh).
g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ] = new IndexedSurfacePatch(); IndexedSurfacePatch* ispCurrent = new IndexedSurfacePatch();
IndexedSurfacePatch* ispCurrent = g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ];
//Compute the extents of the current region //Compute the extents of the current region
//FIXME - This is a little complex? PolyVox could //FIXME - This is a little complex? PolyVox could
@ -457,7 +468,11 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
//Extract the surface for this region //Extract the surface for this region
extractReferenceSurface(&g_volData, Region(regLowerCorner, regUpperCorner), ispCurrent); extractReferenceSurface(&g_volData, Region(regLowerCorner, regUpperCorner), ispCurrent);
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ] = BuildOpenGLSurfacePatch(*ispCurrent); g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ] = BuildOpenGLSurfacePatch(*ispCurrent);
#else
g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ] = ispCurrent;
#endif
//delete ispCurrent; //delete ispCurrent;
} }