From a0f82956c907e3be5fc906639293632d0d003bc2 Mon Sep 17 00:00:00 2001
From: unknown <am05110@LOGTI-A3322-04.ens.ad.etsmtl.ca>
Date: Thu, 10 Nov 2016 12:53:19 -0500
Subject: [PATCH] Sphere Data

---
 src/glnodes/shapes.cpp      |  18 ++++-
 src/glnodes/shapes.h        |  16 +++-
 src/interfaces/visitor.h    |   2 +
 src/viewer/simpleViewer.cpp | 144 +++++++++++++++++++++++++++++++++---
 src/viewer/simpleViewer.h   |   7 +-
 5 files changed, 169 insertions(+), 18 deletions(-)

diff --git a/src/glnodes/shapes.cpp b/src/glnodes/shapes.cpp
index 5ea289c..9fa80e2 100644
--- a/src/glnodes/shapes.cpp
+++ b/src/glnodes/shapes.cpp
@@ -3,15 +3,27 @@
 #include <QVector4D>
 
 void Cube::accept(Visitor &v) {
-	v.visit(*this);
+    v.visit(*this);
+}
+
+void Sphere::accept(Visitor &v) {
+    v.visit(*this);
 }
 
 // ***
 
 void Cube::setColor(QColor& c) {
-	color = QColor(c);
+    color = QColor(c);
 }
 
 QColor Cube::getColor(){
-	return color;
+    return color;
+};
+
+void Sphere::setColor(QColor& c) {
+    color = QColor(c);
+}
+
+QColor Sphere::getColor(){
+    return color;
 };
diff --git a/src/glnodes/shapes.h b/src/glnodes/shapes.h
index 5d058ae..21765ec 100644
--- a/src/glnodes/shapes.h
+++ b/src/glnodes/shapes.h
@@ -15,9 +15,19 @@ class Cube : public Shape
 {
 public:
     Cube(){}
-	QColor color;
+    QColor color;
     void accept(Visitor& v) override;
-	void setColor(QColor& c);
-	QColor getColor();
+    void setColor(QColor& c);
+    QColor getColor();
+};
+
+class Sphere : public Shape
+{
+public:
+    Sphere(){}
+    QColor color;
+    void accept(Visitor& v) override;
+    void setColor(QColor& c);
+    QColor getColor();
 };
 #endif // SHAPES_H
diff --git a/src/interfaces/visitor.h b/src/interfaces/visitor.h
index 999f5c7..5ac432f 100644
--- a/src/interfaces/visitor.h
+++ b/src/interfaces/visitor.h
@@ -2,10 +2,12 @@
 #define VISITOR_H
 class SceneGroup;
 class Cube;
+class Sphere;
 
 class Visitor {
 public:
     virtual void visit(SceneGroup &n) = 0;
     virtual void visit(Cube &s) = 0;
+    virtual void visit(Sphere &s) = 0;
 };
 #endif // VISITOR_H
diff --git a/src/viewer/simpleViewer.cpp b/src/viewer/simpleViewer.cpp
index c2be734..b8168b5 100644
--- a/src/viewer/simpleViewer.cpp
+++ b/src/viewer/simpleViewer.cpp
@@ -47,6 +47,11 @@ namespace
 	const double inc_mult = 5;
 	const double inc_offset = 1.05;
 
+    const int numRowSphere = 20;
+    const int numColSphere = numRowSphere+2;
+    const int numVerticesSphere = numColSphere * numRowSphere + 2;
+    const int numTriSphere = numColSphere*(numRowSphere-1)*2 + 2*numColSphere;
+
     int m_lDirectionLocation;
     int m_normalMatrixLoc;
 
@@ -441,17 +446,98 @@ void Viewer::initGeometries()
         { 0.0, -1.0, 0.0 }, {0.0, -1.0, 0.0}, {0.0, -1.0, 0.0}
     };
 
+    GLfloat sphereVertices[numVerticesSphere][3];
+    GLfloat sphereNormals[numVerticesSphere][3];
+    GLfloat sphereIndices[numTriSphere * 3][3];
 
-    // Fill vertex VBO
+    // Create Sphere
+    // Generate surrounding vertices
+      unsigned int v = 0;
+      float thetaInc = 2.0f*3.14159265f / static_cast<float>(numColSphere);
+      float phiInc = 3.14159265f / static_cast<float>(numRowSphere+1);
+      for (int row=0; row<numRowSphere; ++row)
+      {
+        float phi = 3.14159265f - (static_cast<float>(row+1) * phiInc);
+        for (int col=0; col<numColSphere; ++col, ++v)
+        {
+          float theta = col*thetaInc;
+          sphereVertices[v][0] = 0.5*sin(theta)*sin(phi);
+          sphereVertices[v][1] = 0.5*cos(phi);
+          sphereVertices[v][2] = 0.5*cos(theta)*sin(phi);
+
+          sphereNormals[v][0] = sphereVertices[v][0]*2.0f;	// Multiply by 2 because sphere radius is 0.5
+          sphereNormals[v][1] = sphereVertices[v][1]*2.0f;
+          sphereNormals[v][2] = sphereVertices[v][2]*2.0f;
+        }
+      }
+
+      // Generate cap vertices
+      sphereVertices[numColSphere*numRowSphere+0][0] = 0.0f;
+      sphereVertices[numColSphere*numRowSphere+0][1] = -0.5f;
+      sphereVertices[numColSphere*numRowSphere+0][2] = 0.0f;
+
+      sphereVertices[numColSphere*numRowSphere+1][0] = 0.0f;
+      sphereVertices[numColSphere*numRowSphere+1][1] = 0.5f;
+      sphereVertices[numColSphere*numRowSphere+1][2] = 0.0f;
+
+      sphereNormals[numColSphere*numRowSphere+0][0] = 0.0f;
+      sphereNormals[numColSphere*numRowSphere+0][1] = -1.0f;
+      sphereNormals[numColSphere*numRowSphere+0][2] = 0.0f;
+
+      sphereNormals[numColSphere*numRowSphere+1][0] = 0.0f;
+      sphereNormals[numColSphere*numRowSphere+1][1] = 1.0f;
+      sphereNormals[numColSphere*numRowSphere+1][2] = 0.0f;
+
+      // Generate surrounding indices (faces)
+      unsigned int tri = 0;
+      for (int row=0; row<numRowSphere-1; ++row)
+      {
+        unsigned int rowStart = row*numColSphere;
+        unsigned int topRowStart = rowStart + numColSphere;
+
+        for (int col=0; col<numColSphere; ++col, tri += 2)
+        {
+          // Compute quad vertices
+          unsigned int v = rowStart + col;
+          unsigned int vi = (col<numColSphere-1) ? v+1 : rowStart;
+          unsigned int vj = topRowStart + col;
+          unsigned int vji = (col<numColSphere-1) ? vj+1 : topRowStart;
+
+          // Add to indices
+          sphereIndices[tri+0][0] = v;
+          sphereIndices[tri+0][1] = vi;
+          sphereIndices[tri+0][2] = vj;
+          sphereIndices[tri+1][0] = vi;
+          sphereIndices[tri+1][1] = vji;
+          sphereIndices[tri+1][2] = vj;
+        }
+      }
+
+      // Generate cap indices (faces)
+      for (int col=0; col<numColSphere; ++col, tri += 2)
+      {
+        sphereIndices[tri+0][0] = numColSphere*numRowSphere;
+        sphereIndices[tri+0][1] = (col<numColSphere-1) ? col+1 : 0;
+        sphereIndices[tri+0][2] = col;
+
+        unsigned int rowStart = (numRowSphere-1)*numColSphere;
+        sphereIndices[tri+1][0] = numColSphere*numRowSphere+1;
+        sphereIndices[tri+1][1] = rowStart + col;
+        sphereIndices[tri+1][2] = (col<numColSphere-1) ? (rowStart + col + 1) : rowStart;
+      }
+
+      // Prep buffers
+      glGenBuffers(NumBuffers, m_Buffers);
+
+    // Fill cube vertex VBO
     GLsizeiptr offsetVertices = 0;
     GLsizeiptr offsetNormals = sizeof(verticesCube);
     GLsizeiptr offsetUV = offsetNormals + sizeof(normals);
+
     GLsizeiptr dataSize = offsetUV + sizeof(uvs);
 
 
     glBindVertexArray(m_VAOs[VAO_Cube]);
-//    glBindBuffer(GL_ARRAY_BUFFER, m_Buffers[VBO_Cube]);
-    glGenBuffers(NumBuffers, m_Buffers);
     glBindBuffer(GL_ARRAY_BUFFER, m_Buffers[VBO_Cube]);
     glBufferData(GL_ARRAY_BUFFER, dataSize,
                  NULL, GL_STATIC_DRAW);
@@ -469,23 +555,63 @@ void Viewer::initGeometries()
     glVertexAttribPointer(s_vUvLocation, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(offsetUV));
     glEnableVertexAttribArray(s_vUvLocation);
 
+    // Fill Sphere VBO
+
+
+    GLsizeiptr offsetSphereV = 0;
+    GLsizeiptr offsetSphereN = offsetSphereV + sizeof(sphereVertices);
+    GLsizeiptr sphereDataSize = offsetSphereN + sizeof(sphereNormals);
+
+
+    glBindVertexArray(m_VAOs[VAO_Sphere]);
+    glBindBuffer(GL_ARRAY_BUFFER, m_Buffers[VBO_Sphere]);
+    glBufferData(GL_ARRAY_BUFFER, sphereDataSize,
+                 NULL, GL_STATIC_DRAW);
+
+    glBufferSubData(GL_ARRAY_BUFFER, offsetSphereV, sizeof(sphereVertices), sphereVertices);
+    glBufferSubData(GL_ARRAY_BUFFER, offsetSphereN, sizeof(sphereNormals), sphereNormals);
+
+    glVertexAttribPointer(m_vPositionLocation, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
+    glEnableVertexAttribArray(m_vPositionLocation);
+
+    glVertexAttribPointer(m_vNormalLocation, 3, GL_FLOAT, GL_TRUE, 0, BUFFER_OFFSET(offsetNormals));
+    glEnableVertexAttribArray(m_vNormalLocation);
+
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_Buffers[EBO_Sphere]);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(sphereIndices), sphereIndices, GL_STATIC_DRAW);
 }
 
+
 void Viewer::visit(Cube &s)
 {
-	QMatrix4x4 modelViewMatrix = modelStack.top() * QMatrix4x4(s.transform);
+    QMatrix4x4 modelViewMatrix = modelStack.top() * QMatrix4x4(s.transform);
 
-	int faces = floor(numVerticesCube/6);
-	for(int i = 0; i < faces; i++){ // 6 vertexes par face
+    int faces = floor(numVerticesCube/6);
+    for(int i = 0; i < faces; i++){ // 6 vertexes par face
         glBindVertexArray(m_VAOs[VAO_Cube]);
         m_program->setUniformValue(m_isSkyLoc, false);
         m_program->setUniformValue(m_isPhongLoc, true);
         m_program->setUniformValue(m_mvMatrixLocation, modelViewMatrix);
         m_program->setUniformValue(m_normalMatrixLoc, modelViewMatrix.normalMatrix());
-		m_program->setUniformValue(m_colorLocation, s.getColor());
+        m_program->setUniformValue(m_colorLocation, s.getColor());
 
-		glDrawArrays(GL_TRIANGLES, i*6, 6);
-	}
+        glDrawArrays(GL_TRIANGLES, i*6, 6);
+    }
+}
+
+
+void Viewer::visit(Sphere &s)
+{
+    QMatrix4x4 modelViewMatrix = modelStack.top() * QMatrix4x4(s.transform);
+
+        glBindVertexArray(m_VAOs[VAO_Sphere]);
+        m_program->setUniformValue(m_isSkyLoc, false);
+        m_program->setUniformValue(m_isPhongLoc, true);
+        m_program->setUniformValue(m_mvMatrixLocation, modelViewMatrix);
+        m_program->setUniformValue(m_normalMatrixLoc, modelViewMatrix.normalMatrix());
+        m_program->setUniformValue(m_colorLocation, s.getColor());
+
+        glDrawElements(GL_TRIANGLES, numTriSphere * 3, GL_UNSIGNED_INT, 0);
 }
 
 void Viewer::visit(SceneGroup &s)
diff --git a/src/viewer/simpleViewer.h b/src/viewer/simpleViewer.h
index fc542bd..9d9c058 100644
--- a/src/viewer/simpleViewer.h
+++ b/src/viewer/simpleViewer.h
@@ -46,8 +46,9 @@ public:
 	Viewer();
 	~Viewer();
 
-	virtual void visit(SceneGroup &s);
+    virtual void visit(SceneGroup &s);
     virtual void visit(Cube &s);
+    virtual void visit(Sphere &s);
 
 public slots:
 	void cleanup();
@@ -107,8 +108,8 @@ private:
 	QColor* activeColor;
 	int activeShape;
 
-	enum VAO_IDs { VAO_Cube, NumVAOs };
-	enum Buffer_IDs { VBO_Cube, NumBuffers };
+    enum VAO_IDs { VAO_Cube, VAO_Sphere, NumVAOs };
+    enum Buffer_IDs { VBO_Cube, VBO_Sphere, EBO_Sphere, NumBuffers };
 
 	GLuint m_VAOs[NumVAOs];
 	GLuint m_Buffers[NumBuffers];