///////////////////////////////////////////////////////////////////////////////////////////////////////
// Create a matrix that maps geometry to the screen. 1 unit in the x direction equals one pixel
// of width, same with the y direction.
// It also depends on the size of the texture being displayed
void GenerateOrtho2DMat(GLuint windowWidth, GLuint windowHeight, GLuint imageWidth, GLuint imageHeight)
{
float right = (float)windowWidth;
float quadWidth = right;
float left = 0.0f;
float top = (float)windowHeight;
float quadHeight = top;
float bottom = 0.0f;
float screenAspect = (float)windowWidth/windowHeight;
float imageAspect = (float)imageWidth/imageHeight;
if (screenAspect > imageAspect)
quadWidth = windowHeight*imageAspect;
else
quadHeight = windowWidth*imageAspect;
// set ortho matrix
orthoMatrix[0] = (float)(2 / (right - left));
orthoMatrix[1] = 0.0;
orthoMatrix[2] = 0.0;
orthoMatrix[3] = 0.0;
orthoMatrix[4] = 0.0;
orthoMatrix[5] = (float)(2 / (top - bottom));
orthoMatrix[6] = 0.0;
orthoMatrix[7] = 0.0;
orthoMatrix[8] = 0.0;
orthoMatrix[9] = 0.0;
orthoMatrix[10] = (float)(-2 / (1.0 - 0.0));
orthoMatrix[11] = 0.0;
orthoMatrix[12] = -1*(right + left) / (right - left);
orthoMatrix[13] = -1*(top + bottom) / (top - bottom);
orthoMatrix[14] = -1.0f;
orthoMatrix[15] = 1.0;
// set screen quad vertex array
screenQuad.Reset();
screenQuad.Begin(GL_TRIANGLE_STRIP, 4, 1);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 0.0f, 0.0f);
screenQuad.Vertex3f(0.0f, 0.0f, 0.0f);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 1.0f, 0.0f);
screenQuad.Vertex3f(quadWidth, 0.0f, 0.0f);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 0.0f, 1.0f);
screenQuad.Vertex3f(0.0f, quadHeight, 0.0f);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 1.0f, 1.0f);
screenQuad.Vertex3f(quadWidth, quadHeight, 0.0f);
screenQuad.End();
}
///////////////////////////////////////////////////////////////////////////////////////////////////////
// Create a matrix that maps geometry to the screen. 1 unit in the x directionequals one pixel
// of width, same with the y direction.
//
void GenerateOrtho2DMat(GLuint imageWidth, GLuint imageHeight)
{
float right = (float)imageWidth;
float quadWidth = right;
float left = 0.0f;
float top = (float)imageHeight;
float quadHeight = top;
float bottom = 0.0f;
// set ortho matrix
orthoMatrix[0] = (float)(2 / (right));
orthoMatrix[1] = 0.0;
orthoMatrix[2] = 0.0;
orthoMatrix[3] = 0.0;
orthoMatrix[4] = 0.0;
orthoMatrix[5] = (float)(2 / (top));
orthoMatrix[6] = 0.0;
orthoMatrix[7] = 0.0;
orthoMatrix[8] = 0.0;
orthoMatrix[9] = 0.0;
orthoMatrix[10] = (float)(-2 / (1.0 - 0.0));
orthoMatrix[11] = 0.0;
orthoMatrix[12] = -1.0f;
orthoMatrix[13] = -1.0f;
orthoMatrix[14] = -1.0f;
orthoMatrix[15] = 1.0;
// set screen quad vertex array
screenQuad.Reset();
screenQuad.Begin(GL_TRIANGLE_STRIP, 4, 1);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 0.0f, 0.0f);
screenQuad.Vertex3f(0.0f, 0.0f, 0.0f);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 1.0f, 0.0f);
screenQuad.Vertex3f(right, 0.0f, 0.0f);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 0.0f, 1.0f);
screenQuad.Vertex3f(0.0f, top, 0.0f);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 1.0f, 1.0f);
screenQuad.Vertex3f(right, top, 0.0f);
screenQuad.End();
}
///////////////////////////////////////////////////////////////////////////////////////////////////////
// Create a matrix that maps geometry to the screen. 1 unit in the x directionequals one pixel
// of width, same with the y direction.
void gltGenerateOrtho2DMat(GLuint screenWidth, GLuint screenHeight,
M3DMatrix44f &orthoMatrix, GLBatch &screenQuad)
{
float right = (float)screenWidth;
float left = 0.0f;
float top = (float)screenHeight;
float bottom = 0.0f;
// set ortho matrix
orthoMatrix[0] = (float)(2 / (right - left));
orthoMatrix[1] = 0.0;
orthoMatrix[2] = 0.0;
orthoMatrix[3] = 0.0;
orthoMatrix[4] = 0.0;
orthoMatrix[5] = (float)(2 / (top - bottom));
orthoMatrix[6] = 0.0;
orthoMatrix[7] = 0.0;
orthoMatrix[8] = 0.0;
orthoMatrix[9] = 0.0;
orthoMatrix[10] = (float)(-2 / (1.0 - 0.0));
orthoMatrix[11] = 0.0;
orthoMatrix[12] = -1*(right + left) / (right - left);
orthoMatrix[13] = -1*(top + bottom) / (top - bottom);
orthoMatrix[14] = -1.0f;
orthoMatrix[15] = 1.0;
// set screen quad vertex array
screenQuad.Reset();
screenQuad.Begin(GL_TRIANGLE_STRIP, 4, 1);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 0.0f, 0.0f);
screenQuad.Vertex3f(0.0f, 0.0f, 0.0f);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 1.0f, 0.0f);
screenQuad.Vertex3f((float)screenWidth, 0.0f, 0.0f);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 0.0f, 1.0f);
screenQuad.Vertex3f(0.0f, (float)screenHeight, 0.0f);
screenQuad.Color4f(0.0f, 1.0f, 0.0f, 1.0f);
screenQuad.MultiTexCoord2f(0, 1.0f, 1.0f);
screenQuad.Vertex3f((float)screenWidth, (float)screenHeight, 0.0f);
screenQuad.End();
}
void CreateSphere(float xShift, float yShift, float zShift) {
float radius = 50.0f * scale;
float diameter = radius * 2;
GLfloat x, z;
M3DVector3f* bodyVertices = new M3DVector3f[sphereArraySize * 2];
M3DVector4f* bodyColors = new M3DVector4f[sphereArraySize * 2];
m3dLoadVector3(bodyVertices[0], xShift, radius - diameter/tesselation + yShift, zShift);
m3dLoadVector3(bodyVertices[1], 0.0f + xShift, radius - 2*diameter/tesselation + yShift, zShift);
m3dLoadVector4(bodyColors[0], 0.91f, 0.70f, 0.54f, 1.0f);
m3dLoadVector4(bodyColors[1], 0.91f, 0.70f, 0.54f, 1.0f);
int i = 1;
int colorIndex = 0;
// Kugel vertikal entlang der Breitengrade durchlaufen
for (GLfloat latitude = 0.0f; latitude <= GL_PI; latitude += (GL_PI / tesselation)) {
float sliceRadius = radius * sin(latitude);
GLfloat y = radius * cos(latitude) + yShift;
// Kugelscheibe entlang der Laengengrade durchlaufen
for (GLfloat longitude = 0.0f; longitude <= (2.0f*GL_PI); longitude += (GL_PI / tesselation)) {
float upperRadius = sliceRadius;
float lowerRadius = radius * sin(latitude + (GL_PI / tesselation));
x = cos(longitude);
z = sin(longitude);
m3dLoadVector3(bodyVertices[2 * i], x*upperRadius + xShift, y, z*upperRadius + zShift);
m3dLoadVector3(bodyVertices[2 * i + 1], x*lowerRadius + xShift, radius * cos(latitude + GL_PI/tesselation), z*lowerRadius + zShift);
//fuer Abgabe einkommentieren :)
//if (colorIndex % 2 == 0) {
// m3dLoadVector4(bodyColors[2 * i], 1.0f, 0.8f, 0.2f, 1.0f);
// m3dLoadVector4(bodyColors[2 * i + 1], 1.0f, 0.8f, 0.2f, 1.0f);
//}
//else {
// m3dLoadVector4(bodyColors[2 * i], 0.235f, 0.235f, 0.235f, 1.0f);
// m3dLoadVector4(bodyColors[2 * i + 1], 0.235f, 0.235f, 0.235f, 1.0f);
//}
// fuer Maennchen einkommentieren :)
m3dLoadVector4(bodyColors[2 * i], 0.91f, 0.70f, 0.54f, 1.0f);
m3dLoadVector4(bodyColors[2 * i + 1], 0.91f, 0.70f, 0.54f, 1.0f);
i++;
}
colorIndex++;
}
sphereBody.Reset();
sphereBody.Begin(GL_TRIANGLE_STRIP, sphereArraySize);
sphereBody.CopyVertexData3f(bodyVertices);
sphereBody.CopyColorData4f(bodyColors);
sphereBody.End();
delete[] bodyVertices;
delete[] bodyColors;
}
