[CORE][ADD] Bounding box display

- Add render API in bounding box
- Add getter API in renderer to get bounding box

FinalProject/FinalProject.vcxproj

@@ -172,6 +172,8 @@
     <ClInclude Include="shader.h" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="boundfragmentshader.glsl" />
+    <None Include="boundvertexshader.glsl" />
     <None Include="fragmentshader.glsl">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
       </ExcludedFromBuild>

FinalProject/FinalProject.vcxproj.filters

@@ -294,5 +294,11 @@
     <None Include="terrainvertexshader.glsl">
       <Filter>Resource Files</Filter>
     </None>
+    <None Include="boundvertexshader.glsl">
+      <Filter>Resource Files</Filter>
+    </None>
+    <None Include="boundfragmentshader.glsl">
+      <Filter>Resource Files</Filter>
+    </None>
   </ItemGroup>
 </Project>

FinalProject/boundary.cpp

@@ -1,6 +1,8 @@
 #include <algorithm>
+#include <vector>
 
 #include "boundary.h"
+#include "vao.h"
 
 void Boundary::updateControlPoints(const glm::vec3 point) {
     _bottomControlPoint.x = std::min(_bottomControlPoint.x, point.x);
@@ -40,4 +42,42 @@ bool Boundary::hit(const Ray& ray) const {
     if ((tmin > tzmax) || (tzmin > tmax)) return false;
     
     return true;
-}
+}
+
+void Boundary::render() const {
+    // Generate vertices
+    std::vector<Vertex> vertices;
+    vertices.push_back(Vertex(glm::vec3(_bottomControlPoint.x, _bottomControlPoint.y, _bottomControlPoint.z)));
+    vertices.push_back(Vertex(glm::vec3(_topControlPoint.x, _bottomControlPoint.y, _bottomControlPoint.z)));
+    vertices.push_back(Vertex(glm::vec3(_topControlPoint.x, _topControlPoint.y, _bottomControlPoint.z)));
+    vertices.push_back(Vertex(glm::vec3(_bottomControlPoint.x, _topControlPoint.y, _bottomControlPoint.z)));
+    vertices.push_back(Vertex(glm::vec3(_bottomControlPoint.x, _bottomControlPoint.y, _topControlPoint.z)));
+    vertices.push_back(Vertex(glm::vec3(_topControlPoint.x, _bottomControlPoint.y, _topControlPoint.z)));
+    vertices.push_back(Vertex(glm::vec3(_topControlPoint.x, _topControlPoint.y, _topControlPoint.z)));
+    vertices.push_back(Vertex(glm::vec3(_bottomControlPoint.x, _topControlPoint.y, _topControlPoint.z)));
+    // Generate indices
+    std::vector<unsigned int> indices;
+    indices.push_back(0); indices.push_back(1); indices.push_back(2); indices.push_back(3); // bottom
+    indices.push_back(4); indices.push_back(5); indices.push_back(6); indices.push_back(7); // top
+    indices.push_back(0); indices.push_back(1); indices.push_back(5); indices.push_back(4); // left
+    indices.push_back(3); indices.push_back(2); indices.push_back(6); indices.push_back(7); // right
+    indices.push_back(0); indices.push_back(3); indices.push_back(7); indices.push_back(4); // back
+    indices.push_back(1); indices.push_back(2); indices.push_back(6); indices.push_back(5); // front
+    // Generate VBO
+    VertexBufferObject vbo(vertices);
+    // Generate EBO
+    ElementBufferObject ebo(indices);
+    // Generate VAO
+    VertexArrayObject vao(vbo, ebo);
+    vao.setVertexAttributePointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)0);
+    // Draw
+    vao.bind();
+    OPENGL_EXTRA_FUNCTIONS->glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_INT, (void*)(0 * sizeof(unsigned int)));
+    OPENGL_EXTRA_FUNCTIONS->glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_INT, (void*)(4 * sizeof(unsigned int)));
+    OPENGL_EXTRA_FUNCTIONS->glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_INT, (void*)(8 * sizeof(unsigned int)));
+    OPENGL_EXTRA_FUNCTIONS->glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_INT, (void*)(12 * sizeof(unsigned int)));
+    vao.unbind();
+    // Delete VBO and VAO
+    vbo.dispose();
+    vao.dispose();
+}

FinalProject/boundary.h

@@ -3,6 +3,7 @@
 #include <GLM/glm.hpp>
 
 #include "ray.h"
+#include "utils.h"
 
 class Boundary {
 private:
@@ -21,6 +22,8 @@ public:
     inline glm::vec3 bottomCenterPoint() const;
 
     bool hit(const Ray& ray) const;
+
+    void render() const;
 };
 
 inline glm::vec3 Boundary::bottomCenterPoint() const {

FinalProject/boundfragmentshader.glsl

@@ -0,0 +1,7 @@
+#version 430 core
+
+out vec4 FragColor;
+
+void main() {
+    FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);
+}

FinalProject/boundvertexshader.glsl

@@ -0,0 +1,10 @@
+#version 430 core
+
+layout(location = 0) in vec3 position;
+
+uniform mat4 view;
+uniform mat4 projection;
+
+void main() {
+    gl_Position = projection * view * vec4(position, 1.0);
+}

FinalProject/mainwindow.qrc

@@ -6,6 +6,8 @@
         <file>terrainfragmentshader.glsl</file>
         <file>terrainvertexshader.glsl</file>
         <file>skyboxfragmentshader.glsl</file>
+        <file>boundfragmentshader.glsl</file>
+        <file>boundvertexshader.glsl</file>
     </qresource>
     <qresource prefix="/fonts">
         <file>font_awesome_6_regular_free.otf</file>

FinalProject/renderable.h

@@ -44,6 +44,8 @@ public:
     ScopedLight* originalLight() const; // pass out the light object to scene manager to set light attributes
     bool hasLight() const { return _light != nullptr; }
     void makeLight();   // create a light source in the object
+
+    const Boundary& boundary() const { return _boundary; }
     
     inline glm::mat4 modelMatrix() const;