Merge branch 'support-code' of github.umn.edu:umn-csci-4611-f21/shared-upstream

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diff --git a/dev/a3-earthquake/earth.cc b/dev/a3-earthquake/earth.cc
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+/** CSci-4611 Assignment 3:  Earthquake
+ */
+
+#include "earth.h"
+#include "config.h"
+
+#include <vector>
+
+// for M_PI constant
+#define _USE_MATH_DEFINES
+#include <math.h>
+
+
+Earth::Earth() {
+}
+
+Earth::~Earth() {
+}
+
+void Earth::Init(const std::vector<std::string> &search_path) {
+    // init shader program
+    shader_.Init();
+    
+    // init texture: you can change to a lower-res texture here if needed
+    earth_tex_.InitFromFile(Platform::FindFile("earth-2k.png", search_path));
+
+    // init geometry
+    const int nslices = 10;
+    const int nstacks = 10;
+
+    // TODO: This is where you need to set the vertices and indiceds for earth_mesh_.
+
+    // As a demo, we'll add a square with 2 triangles.
+    std::vector<unsigned int> indices;
+    std::vector<Point3> vertices;
+
+    // four vertices
+    vertices.push_back(Point3(0,0,0));
+    vertices.push_back(Point3(1,0,0));
+    vertices.push_back(Point3(1,1,0));
+    vertices.push_back(Point3(0,1,0));
+
+    // indices into the arrays above for the first triangle
+    indices.push_back(0);
+    indices.push_back(1);
+    indices.push_back(2);
+    
+    // indices for the second triangle, note some are reused
+    indices.push_back(0);
+    indices.push_back(2);
+    indices.push_back(3);
+    
+    earth_mesh_.SetVertices(vertices);
+    earth_mesh_.SetIndices(indices);
+    earth_mesh_.UpdateGPUMemory();
+}
+
+
+
+void Earth::Draw(const Matrix4 &model_matrix, const Matrix4 &view_matrix, const Matrix4 &proj_matrix) {
+    // Define a really bright white light.  Lighting is a property of the "shader"
+    DefaultShader::LightProperties light;
+    light.position = Point3(10,10,10);
+    light.ambient_intensity = Color(1,1,1);
+    light.diffuse_intensity = Color(1,1,1);
+    light.specular_intensity = Color(1,1,1);
+    shader_.SetLight(0, light);
+
+    // Adust the material properties, material is a property of the thing
+    // (e.g., a mesh) that we draw with the shader.  The reflectance properties
+    // affect the lighting.  The surface texture is the key for getting the
+    // image of the earth to show up.
+    DefaultShader::MaterialProperties mat;
+    mat.ambient_reflectance = Color(0.5, 0.5, 0.5);
+    mat.diffuse_reflectance = Color(0.75, 0.75, 0.75);
+    mat.specular_reflectance = Color(0.75, 0.75, 0.75);
+    mat.surface_texture = earth_tex_;
+
+    // Draw the earth mesh using these settings
+    if (earth_mesh_.num_triangles() > 0) {
+        shader_.Draw(model_matrix, view_matrix, proj_matrix, &earth_mesh_, mat);
+    }
+}
+
+
+Point3 Earth::LatLongToSphere(double latitude, double longitude) const {
+    // TODO: We recommend filling in this function to put all your
+    // lat,long --> sphere calculations in one place.
+    return Point3(0,0,0);
+}
+
+Point3 Earth::LatLongToPlane(double latitude, double longitude) const {
+    // TODO: We recommend filling in this function to put all your
+    // lat,long --> plane calculations in one place.
+    return Point3(0,0,0);
+}
+
+
+
+void Earth::DrawDebugInfo(const Matrix4 &model_matrix, const Matrix4 &view_matrix, const Matrix4 &proj_matrix) {
+    // This draws a cylinder for each line segment on each edge of each triangle in your mesh.
+    // So it will be very slow if you have a large mesh, but it's quite useful when you are
+    // debugging your mesh code, especially if you start with a small mesh.
+    for (int t=0; t<earth_mesh_.num_triangles(); t++) {
+        std::vector<unsigned int> indices = earth_mesh_.read_triangle_indices_data(t);
+        std::vector<Point3> loop;
+        loop.push_back(earth_mesh_.read_vertex_data(indices[0]));
+        loop.push_back(earth_mesh_.read_vertex_data(indices[1]));
+        loop.push_back(earth_mesh_.read_vertex_data(indices[2]));
+        quick_shapes_.DrawLines(model_matrix, view_matrix, proj_matrix,
+            Color(1,1,0), loop, QuickShapes::LinesType::LINE_LOOP, 0.005f);
+    }
+}
+