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/** CSci-4611 Assignment 6: Harold
*/
#ifndef GROUND_H_
#define GROUND_H_
#include <mingfx.h>
using namespace mingfx;
#include "edge_mesh.h"
/** The ground is represented with a triangle mesh. 2D "screen space" strokes
are used to modify the vertices based on user input so that the user can create
a 3D landscape of hills and valleys.
*/
class Ground {
public:
Ground();
virtual ~Ground();
/// Call from InitOpenGL() to initialize shaders, etc.
void Init(const std::vector<std::string> &search_path);
/// Projects a 2D normalized screen point (e.g., the mouse position in normalized
/// device coordinates) to a 3D point on the ground. Returns true and sets ground_point
/// to be equal to the result if the conversion is successful. Returns false if
/// the screen point does not project onto the ground.
bool ScreenPtHitsGround(const Matrix4 &view_matrix, const Matrix4 &proj_matrix,
const Point2 &normalized_screen_pt, Point3 *ground_point);
/// Modifies the vertices of the ground mesh to create a hill or valley based
/// on the input stroke. The 2D path of the stroke on the screen is passed
/// in, this is the centerline of the stroke mesh that is actually drawn on
/// the screen while the user is drawing.
void ReshapeGround(const Matrix4 &view_matrix, const Matrix4 &proj_matrix,
const std::vector<Point2> &stroke2d);
/// Draws the ground mesh with toon shading
void Draw(const Matrix4 &view_matrix, const Matrix4 &proj_matrix, const Color &ground_color);
Mesh* mesh_ptr();
private:
// This is the actual triangle mesh for the ground
Mesh ground_mesh_;
// We also maintain a corresponding "edge mesh" in order to do the
// silhouette outlines like in assignment 5
EdgeMesh ground_edge_mesh_;
// The ground rendering is based on the artsy shader from assignment 5
ShaderProgram artsy_shaderprog_;
ShaderProgram outline_shaderprog_;
Texture2D diffuse_ramp_;
Texture2D specular_ramp_;
Point3 light_pos_;
// for debugging only
QuickShapes qs_;
};
#endif
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