void testApp::generateVBOs() {
// If the meshes have already been generated once, we need to clear their data
vboMeshOriginal.clear();
vboMeshMirrored.clear();
// Shorthand to make the equations more readable
// r is the radius of a circle that is inscribed by the display window
// a is the current angle heading we will use to sample the image
// da is half the span of the triangle
float r = minWindowDimension/2.0;
float a = ofDegToRad(imageSectionHeading);
float da = ofDegToRad(triangleAngularWidth/2);
// Define the vertices of the triangular face
ofVec3f triangleBottom(0, 0, 0);
ofVec3f triangleLeft(r*cos(a+da), -r*sin(a+da), 0); // Flip because of drawing
ofVec3f triangleRight(r*cos(a-da), -r*sin(a-da), 0); // Flip because of drawing
float cx = imageSectionCenter.x;
float cy = imageSectionCenter.y;
r = minImageDimension/2.0;
// Define the triangular section of the image that we want to draw on the face
ofVec2f textureBottom(cx, cy);
ofVec2f textureLeft(cx+r*cos(a+da), cy-r*sin(a+da));
ofVec2f textureRight(cx+r*cos(a-da), cy-r*sin(a-da));
// Add the vertices to the VBO mesh to form a triangle
addFace(vboMeshOriginal, triangleBottom, triangleLeft, triangleRight);
addFace(vboMeshMirrored, triangleBottom, triangleLeft, triangleRight);
// Add the texture coordinates to the mesh
addTexture(vboMeshOriginal, textureBottom, textureLeft, textureRight);
addTexture(vboMeshMirrored, textureBottom, textureRight, textureLeft);
}
bool CubemapTexture::Load(const char * path)
{
string textureLeft(VPLOGL_TEXTURE_PATH);
textureLeft.append("Left.ppm");
string textureRight(VPLOGL_TEXTURE_PATH);
textureRight.append("Right.ppm");
string textureUp(VPLOGL_TEXTURE_PATH);
textureUp.append("Up.ppm");
string textureDown(VPLOGL_TEXTURE_PATH);
textureDown.append("Down.ppm");
string textureFront(VPLOGL_TEXTURE_PATH);
textureFront.append("Front.ppm");
string textureBehind(VPLOGL_TEXTURE_PATH);
textureBehind.append("Behind.ppm");
_texture1->LoadPPM(textureRight.c_str());
_texture2->LoadPPM(textureLeft.c_str());
_texture3->LoadPPM(textureUp.c_str());
_texture4->LoadPPM(textureDown.c_str());
_texture5->LoadPPM(textureBehind.c_str());
_texture6->LoadPPM(textureFront.c_str());
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
return true;
}
