Started working on lighting

assets/shaders/basic.frag

@@ -1,20 +0,0 @@
-#version 460 core
-
-in vec3 VertexColor;
-in vec2 TexCoord;
-
-out vec4 fragColor;
-
-uniform sampler2D texture1;
-uniform sampler2D texture2;
-
-uniform float t;
-
-void main()
-{
-	fragColor = mix(
-		texture(texture1, TexCoord + vec2(t, 0)), 
-		texture(texture2, TexCoord + vec2(0, t)), 0.5) * vec4(VertexColor, 
-		1.0
-	);
-}

assets/shaders/cube.frag

@@ -1,13 +0,0 @@
-#version 460 core
-
-out vec4 fragmentColor;
-
-in vec2 textureCoords;
-in vec3 vertexCoords;
-
-uniform sampler2D lauch;
-
-void main()
-{
-	fragmentColor = texture(lauch, textureCoords);
-}

assets/shaders/singleColor.frag

@@ -0,0 +1,10 @@
+#version 460 core
+
+out vec4 fragColor;
+
+uniform vec3 color;
+
+void main()
+{
+	fragColor = vec4(color, 1.0f);
+}

assets/shaders/singleColor.vert

@@ -1,19 +1,12 @@
 #version 460 core
 
 layout (location = 0) in vec3 aPos;
-layout (location = 1) in vec3 aCol;
-layout (location = 2) in vec2 aTex;
 
 uniform mat4 model;
 uniform mat4 view;
 uniform mat4 projection;
 
-out vec3 VertexColor;
-out vec2 TexCoord;
-
 void main()
 {
 	gl_Position = projection * view * model * vec4(aPos, 1.0f);
-	VertexColor = aCol;
-	TexCoord = aTex;
 }

assets/shaders/textured.frag

@@ -0,0 +1,12 @@
+#version 460 core
+
+in vec2 vertexUV;
+
+out vec4 fragmentColor;
+
+uniform sampler2D modelTexture;
+
+void main()
+{
+	fragmentColor = texture(modelTexture, vertexUV);
+}

assets/shaders/textured.vert

@@ -3,16 +3,15 @@
 layout (location = 0) in vec3 aPos;
 layout (location = 1) in vec2 aTex;
 
+out vec2 vertexUV;
+
 uniform mat4 model;
 uniform mat4 view;
 uniform mat4 projection;
 
-out vec3 vertexCoords;
-out vec2 textureCoords;
-
 void main()
 {
 	gl_Position = projection * view * model * vec4(aPos, 1.0f);
-	textureCoords = aTex;
-	vertexCoords = aPos;
+
+	vertexUV = aTex;
 }

src/CMakeLists.txt

@@ -3,13 +3,14 @@ set(VENDOR ${CMAKE_SOURCE_DIR}/vendor)
 
 add_executable(example
 	"main.cpp"
-   )
+    "objects/lighting/PointLight.cpp")
 
 file(GLOB SOURCE_FILES
 	"${VENDOR}/src/*.c"
 	"${VENDOR}/src/*.cpp"
 	"objects/*.cpp"
 	"objects/primitives/*.cpp"
+	"objects/lighting/*.cpp"
 )
 
 target_sources(example PRIVATE
@@ -22,6 +23,7 @@ target_include_directories(example PRIVATE
 	${VENDOR}/include/imgui
 	objects
 	objects/primitives
+	objects/lighting
 )
 
 target_link_libraries(example

src/main.cpp

@@ -13,6 +13,7 @@
 #include <imgui/imgui_impl_glfw.h>
 #include <imgui/imgui_impl_opengl3.h>
 
+#include "lighting/PointLight.hpp"
 #include "Camera.hpp"
 #include "Shader.hpp"
 #include "Texture.hpp"
@@ -154,13 +155,12 @@ int main(int argc, char** argv)
 	glViewport(0, 0, 800, 800);
 	glfwSetFramebufferSizeCallback(window, FramebufferSizeCallback);
 
-	Shader cubeShader("cube.vert", "cube.frag");
-	cubeShader.Use();
-
 	glm::mat4 perspective = glm::mat4(1.0f);
 
+	Shader singleColorShader("singleColor.vert", "singleColor.frag");
+	Shader texturedShader("textured.vert", "textured.frag");
+
 	Texture cubeTexture("crate.jpg");
-	cubeShader.SetUniformInt("lauch", 0);
 
 	glm::vec3 cubePositions[] = {
 		glm::vec3(0.0f,  0.0f,  0.0f),
@@ -184,6 +184,8 @@ int main(int argc, char** argv)
 		cubes.push_back(newCube);
 	}
 
+	PointLight lightSource(glm::vec3(0.0f, 3.0f, 0.0f), glm::vec3(0.5f, 0.1f, 0.1f), 1.0f);
+
 	// A camera
 	Camera cam(glm::vec3(0.0f, 0.0f, 10.0f), glm::vec2(0.0f, -90.0f));
 
@@ -212,7 +214,9 @@ int main(int argc, char** argv)
 		static float zNear = 0.1f;
 		static float zFar = 100.0f;
 		
-		glClearColor(0.1f, 0.4f, 0.1f, 1.0f);
+		static float bgColor[3] = { 0.1f, 0.4f, 0.1f };
+		
+		glClearColor(bgColor[0], bgColor[1], bgColor[2], 1.0f);
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
 		ImGui_ImplOpenGL3_NewFrame();
@@ -235,17 +239,27 @@ int main(int argc, char** argv)
 			ImGui::SliderFloat("Sensitivity", &sensitivity, 0.01, 10.0f);
 		}
 
+		if (ImGui::CollapsingHeader("Scene"))
+		{
+			ImGui::ColorPicker3("Background", bgColor);
+		}
+
 		ImGui::End();
 
 		perspective = glm::perspective(fov, (float)width/(float)height, zNear, zFar);
 
 		cubeTexture.Bind();
-		cubeShader.Use();
-		cubeShader.SetUniformMat4("projection", &perspective[0][0]);
-		cam.Use(cubeShader);
 
+		texturedShader.Use();
+		texturedShader.SetUniformMat4("projection", &perspective[0][0]);
+		cam.Use(texturedShader);
 		for (Cube* cube : cubes)
-			cube->Draw(cubeShader);
+			cube->Draw(texturedShader);
+
+		singleColorShader.Use();
+		singleColorShader.SetUniformMat4("projection", &perspective[0][0]);
+		cam.Use(singleColorShader);
+		lightSource.Draw(singleColorShader);
 
 		ImGui::Render();
 		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

src/objects/Shader.cpp

@@ -91,7 +91,7 @@ Shader::~Shader()
 	glDeleteProgram(program);
 }
 
-void Shader::Use()
+void Shader::Use() const
 {
 	glUseProgram(program);
 }
@@ -106,6 +106,11 @@ void Shader::SetUniformFloat(const char* uniform, float value) const
 	glUniform1f(glGetUniformLocation(program, uniform), value);
 }
 
+void Shader::SetUniformFloat3(const char* uniform, const float* ptrToVec3) const
+{
+	glUniform3f(glGetUniformLocation(program, uniform), ptrToVec3[0], ptrToVec3[1], ptrToVec3[2]);
+}
+
 void Shader::SetUniformMat4(const char* uniform, const float* ptrToMatrix) const
 {
 	glUniformMatrix4fv(glGetUniformLocation(program, uniform), 1, GL_FALSE, ptrToMatrix);

src/objects/Shader.hpp

@@ -11,10 +11,11 @@ public:
 	Shader(const char* vertShader, const char* fragShader);
 	~Shader();
 
-	void Use();
+	void Use() const;
 
 	void SetUniformInt(const char* uniform, int value) const;
 	void SetUniformFloat(const char* uniform, float value) const;
+	void SetUniformFloat3(const char* uniform, const float* ptrToVec3) const;
 	void SetUniformMat4(const char* uniform, const float* ptrToMatrix) const;
 
 private:

src/objects/lighting/PointLight.cpp

@@ -0,0 +1,71 @@
+#include "PointLight.hpp"
+
+#include <glm/gtc/matrix_transform.hpp>
+#include <glad/glad.h>
+
+unsigned int PointLight::VAO = 0;
+unsigned int PointLight::VBO = 0;
+unsigned int PointLight::EBO = 0;
+
+const float PointLight::vertices[8 * 3] = {
+		-1.0f, 1.0f, 1.0f,			// Front Top Left
+		1.0f, 1.0f, 1.0f,			// Front Top Right
+		1.0f, -1.0f, 1.0f,			// Front Bottom Right
+		-1.0f, -1.0f, 1.0f,			// Front Bottom Left
+		-1.0f, 1.0f, -1.0f,			// Back Top Left
+		1.0f, 1.0f, -1.0f,			// Back Top Right
+		1.0f, -1.0f, -1.0f,			// Back Bottom Right
+		-1.0f, -1.0f, -1.0f,		// Back Bottom Left
+};
+
+const unsigned int PointLight::indices[6 * 2 * 3] = {
+		0, 1, 3,	// Front
+		1, 2, 3,
+		4, 5, 7,	// Back
+		5, 6, 7,
+		4, 5, 0,	// Top
+		5, 1, 0,
+		7, 6, 3,	// Bottom
+		6, 2, 3,
+		4, 0, 7,	// Left
+		0, 3, 7,
+		1, 5, 2,
+		5, 6, 2
+};
+
+PointLight::PointLight(glm::vec3 position, glm::vec3 color, float intensity) :
+	position(position), color(color), intensity(intensity),
+	transformation(1.0f)
+{
+	if (VAO == 0)
+	{
+		glGenVertexArrays(1, &VAO);
+		glGenBuffers(1, &VBO);
+		glGenBuffers(1, &EBO);
+
+		glBindVertexArray(VAO);
+		
+		glBindBuffer(GL_ARRAY_BUFFER, VBO);
+		glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+		glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+
+		glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+		glEnableVertexAttribArray(0);
+	}
+
+	transformation = glm::translate(transformation, position);
+	transformation = glm::scale(transformation, glm::vec3(0.1f));
+}
+
+void PointLight::Draw(const Shader& program)
+{
+	program.SetUniformFloat3("color", &color[0]);
+	program.SetUniformMat4("model", &transformation[0][0]);
+
+	glBindVertexArray(VAO);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+
+	glDrawElements(GL_TRIANGLES, 3 * 6 * 2, GL_UNSIGNED_INT, 0);
+}

src/objects/lighting/PointLight.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <glm/glm.hpp>
+
+#include "Shader.hpp"
+
+class PointLight
+{
+public:
+	static const float vertices[8 * 3];
+	static const unsigned int indices[6 * 2 * 3];
+public:
+	PointLight(glm::vec3 position, glm::vec3 color, float intensity);
+	~PointLight() = default;
+
+	void Draw(const Shader& program);
+
+private:
+	static unsigned int VAO, VBO, EBO;
+
+	glm::vec3 position, color;
+	float intensity;
+
+	glm::mat4 transformation;
+};