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Work on new OpenGL example - Added mouse handling for rotation.

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This commit is contained in:
David Williams 2009-03-15 22:07:38 +00:00
parent 997bef28db
commit 226d727b83
1 changed files with 41 additions and 7 deletions
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48
examples/OpenGL/main.cpp
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@ -34,6 +34,11 @@ const uint16 g_uVolumeSideLength = 128;
const uint16 g_uRegionSideLength = 16;
const uint16 g_uVolumeSideLengthInRegions = g_uVolumeSideLength / g_uRegionSideLength;
int g_xRotation = 0.0f;
int g_yRotation = 0.0f;
int g_xOld = 0;
int g_yOld = 0;
//Creates a volume 128x128x128
BlockVolume<uint8> g_volData(logBase2(g_uVolumeSideLength));
@ -188,6 +193,8 @@ void init ( GLvoid ) // Create Some Everyday Functions
glEnable(GL_LIGHTING);
glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
glEnable(GL_LIGHT0);
glShadeModel(GL_SMOOTH);
// Create light components
/*GLfloat ambientLight[] = { 0.2f, 0.2f, 0.2f, 1.0f };
@ -206,8 +213,16 @@ void init ( GLvoid ) // Create Some Everyday Functions
void display ( void ) // Create The Display Function
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
glMatrixMode ( GL_MODELVIEW ); // Select The Model View Matrix
glLoadIdentity(); // Reset The Current Modelview Matrix
glTranslatef(-g_uVolumeSideLength/2,-g_uVolumeSideLength/2,-200.0f);
glTranslatef(0.0f, 0.0f, -100.0f);
glRotatef(g_xRotation, 1.0f, 0.0f, 0.0f);
glRotatef(g_yRotation, 0.0f, 1.0f, 0.0f);
glTranslatef(-g_uVolumeSideLength/2,-g_uVolumeSideLength/2,-g_uVolumeSideLength/2);
for(uint16 uRegionZ = 0; uRegionZ < g_uVolumeSideLengthInRegions; ++uRegionZ)
{
@ -226,7 +241,7 @@ void display ( void ) // Create The Display Function
glEnableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glDrawElements(GL_TRIANGLE_STRIP, g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ].noOfIndices, GL_UNSIGNED_INT, 0);
glDrawElements(GL_TRIANGLES, g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ].noOfIndices, GL_UNSIGNED_INT, 0);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
@ -250,6 +265,12 @@ void display ( void ) // Create The Display Function
// Swap The Buffers To Not Be Left With A Clear Screen
}
void idle()
{
glutPostRedisplay();
}
void reshape ( int w, int h ) // Create The Reshape Function (the viewport)
{
glViewport ( 0, 0, w, h );
@ -274,6 +295,18 @@ default: // Now Wrap It Up
}
}
void motion(int x, int y)
{
glMatrixMode(GL_MODELVIEW);
int xDiff = x - g_xOld;
int yDiff = y - g_yOld;
g_xOld = x;
g_yOld = y;
g_xRotation += xDiff;
g_yRotation += yDiff;
}
void arrow_keys ( int a_keys, int x, int y ) // Create Special Function (required for arrow keys)
{
switch ( a_keys ) {
@ -294,11 +327,12 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
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
glutMotionFunc(motion);
glutDisplayFunc ( display ); // Matching Earlier Functions To Their Counterparts
glutReshapeFunc ( reshape );
glutKeyboardFunc ( keyboard );
glutSpecialFunc ( arrow_keys );
glutIdleFunc(idle);
#ifdef WIN32
//If we are on Windows we will need GLEW to access recent OpenGL functionality
@ -322,10 +356,10 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
createSphere(20.0f, 2);
createSphere(10.0f, 1);
createCube(Vector3DUint16(minPos, minPos, minPos), Vector3DUint16(midPos, midPos, midPos), 0);
createCube(Vector3DUint16(midPos, midPos, minPos), Vector3DUint16(maxPos, maxPos, midPos), 0);
createCube(Vector3DUint16(midPos, minPos, midPos), Vector3DUint16(maxPos, midPos, maxPos), 0);
createCube(Vector3DUint16(minPos, midPos, midPos), Vector3DUint16(midPos, maxPos, maxPos), 0);
createCube(Vector3DUint16(minPos, minPos, minPos), Vector3DUint16(midPos-1, midPos-1, midPos-1), 0);
createCube(Vector3DUint16(midPos+1, midPos+1, minPos), Vector3DUint16(maxPos, maxPos, midPos-1), 0);
createCube(Vector3DUint16(midPos+1, minPos, midPos+1), Vector3DUint16(maxPos, midPos-1, maxPos), 0);
createCube(Vector3DUint16(minPos, midPos+1, midPos+1), Vector3DUint16(midPos-1, maxPos, maxPos), 0);
//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.