Improve material loading and add coordinate system model

CMakeLists.txt

@@ -2,7 +2,7 @@ project(opengl-playground)
 
 #set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake")
 
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.16)
 find_package(glm REQUIRED)
 find_package(PkgConfig REQUIRED)
 pkg_check_modules(EPOXY REQUIRED epoxy)
@@ -26,6 +26,10 @@ configure_file("shaders/2d-zoom-translate-vertex.glsl" "shaders/2d-zoom-translat
 configure_file("shaders/mesh-vertex.glsl" "shaders/mesh-vertex.glsl" COPYONLY)
 configure_file("shaders/mesh-fragment.glsl" "shaders/mesh-fragment.glsl" COPYONLY)
 
+configure_file("models/coordinate-system/coordsys.obj" "coordinate-system/coordsys.obj" COPYONLY)
+configure_file("models/coordinate-system/coordsys.mtl" "coordinate-system/coordsys.mtl" COPYONLY)
+
+
 set(IMGUI_SOURCES	"${CMAKE_CURRENT_SOURCE_DIR}/imgui-submodule/imgui/imgui.cpp"
 	                "${CMAKE_CURRENT_SOURCE_DIR}/imgui-submodule/imgui/imgui_draw.cpp"
 			"${CMAKE_CURRENT_SOURCE_DIR}/imgui-submodule/imgui/imgui_demo.cpp"

include/opengl-playground/material.hpp

@@ -0,0 +1,47 @@
+#ifndef MATERIAL_H
+#define MATERIAL_H
+
+#include <opengl-playground/opengltexture.hpp>
+#include <memory>
+#include <vector>
+#include <glm/glm.hpp>
+
+
+class Material
+{
+	public:
+		Material();
+		Material(std::shared_ptr<OpenGlTexture> diffuse_texture,
+		         std::shared_ptr<OpenGlTexture> ambient_texture,
+		         std::shared_ptr<OpenGlTexture> specular_texture);
+		Material(const glm::vec3 &diff_color, const glm::vec3 &ambient_color, const glm::vec3 &specular_color);
+		void setSpecularColor(const glm::vec3 &color);
+		void setAmbientColor(const glm::vec3 &color);
+		void setDiffuseColor(const glm::vec3 &color);
+		void pushSpecularTexture(std::shared_ptr<OpenGlTexture> texture);
+		void pushAmbientTexture(std::shared_ptr<OpenGlTexture> texture);
+		void pushDiffuseTexture(std::shared_ptr<OpenGlTexture> texture);
+		void pushSpecularTexture(const std::vector<std::shared_ptr<OpenGlTexture>> &textures);
+		void pushAmbientTexture(const std::vector<std::shared_ptr<OpenGlTexture>> &textures);
+		void pushDiffuseTexture(const std::vector<std::shared_ptr<OpenGlTexture>> &textures);
+
+		const std::vector<std::shared_ptr<OpenGlTexture>> &getSpecularTextures();
+		const std::vector<std::shared_ptr<OpenGlTexture>> &getAmbientTextures();
+		const std::vector<std::shared_ptr<OpenGlTexture>> &getDiffuseTextures();
+		const glm::vec3 &getDiffuseColor();
+		const glm::vec3 &getAmbientColor();
+		const glm::vec3 &getSpecularColor();
+
+		float shininess_strength;
+		float shininess;
+
+	private:
+		std::vector<std::shared_ptr<OpenGlTexture>> diffuse_textures;
+		std::vector<std::shared_ptr<OpenGlTexture>> ambient_textures;
+		std::vector<std::shared_ptr<OpenGlTexture>> specular_textures;
+		glm::vec3 diff_color;
+		glm::vec3 ambient_color;
+		glm::vec3 specular_color;
+};
+
+#endif // MATERIAL_H

include/opengl-playground/mesh.hpp

@@ -6,16 +6,17 @@
 #include <opengl-playground/vertex.hpp>
 #include <opengl-playground/opengltexture.hpp>
 #include <opengl-playground/openglgraphics.hpp>
+#include <opengl-playground/material.hpp>
 
 class Mesh : public OpenGlGraphics
 {
 	public:
 		Mesh(std::vector<Vertex> vertices, std::vector<unsigned int> indices,
-		     std::vector<std::shared_ptr<OpenGlTexture>> textures,
+		     const Material &mat,
 		     std::shared_ptr<OpenGlShaderProgram> shader);
 		std::vector<Vertex> vertices;
 		std::vector<unsigned int> indices;
-		std::vector<std::shared_ptr<OpenGlTexture>> textures;
+		Material material;
 		void realize();
 		void render();
 		void render(const glm::mat4 &model_matrix, const glm::mat4 &normal_matrix);

include/opengl-playground/model.hpp

@@ -22,7 +22,7 @@ class Model : public OpenGlGraphics
 		std::vector<Mesh> meshes;
 		std::vector<std::shared_ptr<OpenGlTexture>> allocated_textures;
 		std::string directory;
-		std::vector<std::shared_ptr<OpenGlTexture>> loadMaterialTextures(aiMaterial *mat, aiTextureType type, TextureType tex_type);
+		std::vector<std::shared_ptr<OpenGlTexture>> loadMaterialTextures(aiMaterial *mat, aiTextureType type);
 		void processNode(aiNode *node, const aiScene *scene);
 		Mesh processMesh(aiMesh *mesh, const aiScene *scene);
 };

include/opengl-playground/openglshader.hpp

@@ -22,6 +22,7 @@ class OpenGlShaderProgram
 		void setUniformVec3(const std::string &uniform, const glm::vec3 &vector);
 		void setUniformMat4(const std::string &uniform, const glm::mat4 &matrix);
 		void setUniformVec4(const std::string &uniform, const glm::vec4 &vector);
+		void setUniformBool(const std::string &uniform, bool value);
 	private:
 		bool compiled;
 		GLuint shader_program;

include/opengl-playground/opengltexture.hpp

@@ -4,12 +4,10 @@
 #include <epoxy/gl.h>
 #include <string>
 
-typedef enum {TEXTURE_DIFFUSE, TEXTURE_SPECULAR} TextureType;
-
 class OpenGlTexture
 {
 	public:
-		OpenGlTexture(TextureType type, const std::string &texture_path);
+		OpenGlTexture(const std::string &texture_path);
 		OpenGlTexture();
 		OpenGlTexture(const OpenGlTexture &tex) = delete;
 		OpenGlTexture(const OpenGlTexture &&tex) = delete;
@@ -19,12 +17,10 @@ class OpenGlTexture
 		void use(unsigned int slot);
 		void use();
 		const std::string &getPath();
-		TextureType getType();
+		float blend;
 
 	private:
 		std::string texture_path;
-		TextureType type;
-
 	protected:
 		GLuint texture;
 

models/coordinate-system/coordsys.mtl

@@ -0,0 +1,32 @@
+# Blender MTL File: 'coords.blend'
+# Material Count: 3
+
+newmtl Materialx
+Ns 323.999994
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.000000 0.002609
+Ks 0.216667 0.216667 0.216667
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl Materialy
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.004587 0.800000 0.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl Materialz
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.000000 0.003199 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2

shaders/mesh-fragment.glsl

@@ -9,6 +9,14 @@ struct Material {
 	sampler2D specular1;
 	sampler2D specular2;
 	sampler2D specular3;
+	sampler2D ambient0;
+	sampler2D ambient1;
+	bool use_diff_color;
+	vec3 diff_color;
+	bool use_spec_color;
+	vec3 spec_color;
+	int use_amb_color;
+	vec3 amb_color;
 };
 
 out vec4 fragmentColor;
@@ -26,8 +34,28 @@ void main()
 	const float light_spec = 0.4;
 	const float light_diff = 0.7;
 
-	vec3 diffuseTexCol = vec3(texture(material.diffuse0, TexCoord));
-	vec3 specularTexCol = vec3(texture(material.specular0, TexCoord));
+	vec3 diffuseTexCol;
+	if (material.use_diff_color) {
+		diffuseTexCol = material.diff_color;
+	} else {
+		diffuseTexCol = vec3(texture(material.diffuse0, TexCoord));
+	}
+
+	vec3 specularTexCol;
+	if (material.use_spec_color) {
+		specularTexCol = material.spec_color;
+	} else {
+		specularTexCol = vec3(texture(material.specular0, TexCoord));
+	}
+
+	vec3 ambTexCol;
+	if (material.use_amb_color == 0) {
+		ambTexCol = vec3(texture(material.ambient0, TexCoord));
+	} else if (material.use_amb_color == 1) {
+		ambTexCol = diffuseTexCol * 0.5;
+	} else if (material.use_amb_color == 2) {
+		ambTexCol = material.amb_color;
+	}
 
 	vec3 normal_n = normalize(Normal);
 	vec3 light_dir_n = normalize(light_direction);

src/main.cpp

@@ -59,6 +59,9 @@ int main(int argc, char **argv)
 	shader->compile();
 	Model m("nanosuit/nanosuit.obj", glm::vec4(1.0f, 0.0f, 0.0f, 1.0f), shader);
 
+	Model coords("coordinate-system/coordsys.obj", glm::vec4(1.0f, 0.0f, 0.0f, 1.0f), shader);
+
+	coords.realize();
 	m.realize();
 	m.setModelMatrix(glm::scale(glm::mat4(1.0f), glm::vec3(0.2f, 0.2f, 0.2f)));
 
@@ -159,6 +162,7 @@ int main(int argc, char **argv)
 		}
 
 		m.render();
+		coords.render();
 
 		glm::mat4 current_model_matrix = m.getModelMatrix();
 		current_model_matrix = glm::translate(glm::mat4(1.0f), glm::vec3(3.0f, 0.0f, 0.0f)) * current_model_matrix;

src/material.cpp

@@ -0,0 +1,95 @@
+#include <opengl-playground/material.hpp>
+
+
+
+Material::Material()
+{
+	shininess_strength = 0.0f;
+	shininess = 1.0f;
+	this->setDiffuseColor(glm::vec3(0.0f));
+	this->setAmbientColor(glm::vec3(0.0f));
+	this->setSpecularColor(glm::vec3(0.0f));
+}
+
+Material::Material(const glm::vec3 &diff_color, const glm::vec3 &ambient_color, const glm::vec3 &specular_color) : Material()
+{
+	this->setDiffuseColor(diff_color);
+	this->setAmbientColor(ambient_color);
+	this->setSpecularColor(specular_color);
+}
+
+void Material::setSpecularColor(const glm::vec3 &color)
+{
+	this->specular_color = color;
+}
+
+void Material::setAmbientColor(const glm::vec3 &color)
+{
+	this->ambient_color = color;
+}
+
+void Material::setDiffuseColor(const glm::vec3 &color)
+{
+	this->diff_color = color;
+}
+
+void Material::pushSpecularTexture(std::shared_ptr<OpenGlTexture> texture)
+{
+	this->specular_textures.push_back(texture);
+}
+
+void Material::pushAmbientTexture(std::shared_ptr<OpenGlTexture> texture)
+{
+	this->ambient_textures.push_back(texture);
+}
+
+void Material::pushDiffuseTexture(std::shared_ptr<OpenGlTexture> texture)
+{
+	this->diffuse_textures.push_back(texture);
+}
+
+void Material::pushSpecularTexture(const std::vector<std::shared_ptr<OpenGlTexture>> &textures)
+{
+	this->specular_textures.insert(this->specular_textures.end(), textures.begin(), textures.end());
+}
+
+void Material::pushAmbientTexture(const std::vector<std::shared_ptr<OpenGlTexture>> &textures)
+{
+	this->ambient_textures.insert(this->ambient_textures.end(), textures.begin(), textures.end());
+}
+
+void Material::pushDiffuseTexture(const std::vector<std::shared_ptr<OpenGlTexture>> &textures)
+{
+	this->diffuse_textures.insert(this->diffuse_textures.end(), textures.begin(), textures.end());
+}
+
+const std::vector<std::shared_ptr<OpenGlTexture>> &Material::getSpecularTextures()
+{
+	return this->specular_textures;
+}
+
+const std::vector<std::shared_ptr<OpenGlTexture>> &Material::getAmbientTextures()
+{
+	return this->ambient_textures;
+}
+
+const std::vector<std::shared_ptr<OpenGlTexture>> &Material::getDiffuseTextures()
+{
+	return this->diffuse_textures;
+}
+
+const glm::vec3 &Material::getDiffuseColor()
+{
+	return this->diff_color;
+}
+
+const glm::vec3 &Material::getAmbientColor()
+{
+	return this->ambient_color;
+}
+
+const glm::vec3 &Material::getSpecularColor()
+{
+	return this->specular_color;
+}
+

src/mesh.cpp

@@ -1,17 +1,16 @@
 #include <opengl-playground/mesh.hpp>
 #include <opengl-playground/globalcanvassettings.hpp>
-
 #include <glm/gtc/matrix_transform.hpp>
 #include <iostream>
 
 Mesh::Mesh(std::vector<Vertex> vertices, std::vector<unsigned int> indices,
-	   std::vector<std::shared_ptr<OpenGlTexture> > textures,
+	   const Material &mat,
 	   std::shared_ptr<OpenGlShaderProgram> shader) :
 	OpenGlGraphics(shader)
 {
 	this->vertices = vertices;
 	this->indices = indices;
-	this->textures = textures;
+	this->material = mat;
 }
 
 void Mesh::realize()
@@ -52,24 +51,62 @@ void Mesh::render(const glm::mat4 &model_matrix, const glm::mat4 &normal_matrix)
 	this->shaderprog->setUniformMat4("projection_view_matrix", GlobalCanvasSettings::getPVMatrix());
 	this->shaderprog->setUniformVec3("camera_position", GlobalCanvasSettings::getCameraPosition());
 
-	int spec_num = 0;
-	int diff_num = 0;
+	auto diffTex = this->material.getDiffuseTextures();
+	auto specTex = this->material.getSpecularTextures();
+	auto ambTex = this->material.getAmbientTextures();
+
 	/* Setup the texture samplers */
-	for (unsigned int i = 0; i < this->textures.size(); i++) {
+	int tex_slot = 0;
+	for (unsigned int i = 0; i < diffTex.size(); i++, tex_slot++) {
 		std::string uniform_name;
-		textures[i]->use(i);
-		switch (textures[i]->getType()) {
-		case TEXTURE_DIFFUSE:
-			uniform_name = "material.diffuse" + std::to_string(diff_num++);
-			this->shaderprog->setUniformInt(uniform_name, i);
-			break;
-		case TEXTURE_SPECULAR:
-			uniform_name = "material.specular" + std::to_string(spec_num++);
-			this->shaderprog->setUniformInt(uniform_name, i);
-			break;
-		default:
-			break;
-		}
+		diffTex[i]->use(tex_slot);
+		uniform_name = "material.diffuse" + std::to_string(i);
+		this->shaderprog->setUniformInt(uniform_name, i);
+	}
+
+	for (unsigned int i = 0; i < specTex.size(); i++, tex_slot++) {
+		std::string uniform_name;
+		specTex[i]->use(tex_slot);
+		uniform_name = "material.specular" + std::to_string(i);
+		this->shaderprog->setUniformInt(uniform_name, i);
+	}
+
+	for (unsigned int i = 0; i < ambTex.size(); i++, tex_slot++) {
+		std::string uniform_name;
+		specTex[i]->use(tex_slot);
+		uniform_name = "material.ambient" + std::to_string(i);
+		this->shaderprog->setUniformInt(uniform_name, i);
+	}
+
+	if (diffTex.size() == 0) {
+		this->shaderprog->setUniformVec3("material.diff_color", this->material.getDiffuseColor());
+		this->shaderprog->setUniformBool("material.use_diff_color", true);
+	} else {
+		this->shaderprog->setUniformBool("material.use_diff_color", false);
+	}
+
+	if (specTex.size() == 0) {
+		this->shaderprog->setUniformVec3("material.spec_color", this->material.getSpecularColor());
+		this->shaderprog->setUniformBool("material.use_spec_color", true);
+	} else {
+		this->shaderprog->setUniformBool("material.use_spec_color", false);
+	}
+
+	if (specTex.size() == 0) {
+		this->shaderprog->setUniformVec3("material.spec_color", this->material.getSpecularColor());
+		this->shaderprog->setUniformBool("material.use_spec_color", true);
+	} else {
+		this->shaderprog->setUniformBool("material.use_spec_color", false);
+	}
+
+	if (diffTex.size() == 0 && ambTex.size() == 0) {
+		this->shaderprog->setUniformVec3("material.amb_color", this->material.getAmbientColor());
+		this->shaderprog->setUniformInt("material.use_amb_color", 2);
+	} else {
+		if (diffTex.size() > 0)
+			this->shaderprog->setUniformInt("material.use_amb_color", 1);
+		else
+			this->shaderprog->setUniformInt("material.use_amb_color", 0);
 	}
 
 	glBindVertexArray(this->vao);

src/model.cpp

@@ -1,4 +1,5 @@
 #include <opengl-playground/model.hpp>
+#include <opengl-playground/material.hpp>
 #include <iostream>
 
 Model::Model(const std::string &path, const glm::vec4 &static_color, std::shared_ptr<OpenGlShaderProgram> shader)
@@ -47,8 +48,7 @@ void Model::processNode(aiNode *node, const aiScene *scene)
 }
 
 
-std::vector<std::shared_ptr<OpenGlTexture>> Model::loadMaterialTextures(aiMaterial *mat, aiTextureType type,
-									TextureType tex_type)
+std::vector<std::shared_ptr<OpenGlTexture>> Model::loadMaterialTextures(aiMaterial *mat, aiTextureType type)
 {
 	std::vector<std::shared_ptr<OpenGlTexture>> tex_vector;
 
@@ -66,7 +66,7 @@ std::vector<std::shared_ptr<OpenGlTexture>> Model::loadMaterialTextures(aiMateri
 		}
 
 		if (!already_loaded) {
-			auto new_texture = std::make_shared<OpenGlTexture>(tex_type, str.C_Str());
+			auto new_texture = std::make_shared<OpenGlTexture>(str.C_Str());
 			new_texture->loadFromImagePath(this->directory);
 			tex_vector.push_back(new_texture);
 			this->allocated_textures.push_back(new_texture);
@@ -80,7 +80,7 @@ Mesh Model::processMesh(aiMesh *mesh, const aiScene *scene)
 {
 	std::vector<Vertex> vertices;
 	std::vector<unsigned int> indices;
-	std::vector<std::shared_ptr<OpenGlTexture>> textures;
+	Material mesh_material;
 
 	for(unsigned int i = 0; i < mesh->mNumVertices; i++)
 	{
@@ -115,15 +115,30 @@ Mesh Model::processMesh(aiMesh *mesh, const aiScene *scene)
 
 	if(mesh->mMaterialIndex >= 0)
 	{
+		aiColor3D col;
+
 		aiMaterial *material = scene->mMaterials[mesh->mMaterialIndex];
-		auto diffuseTextures = loadMaterialTextures(material, aiTextureType_DIFFUSE, TEXTURE_DIFFUSE);
-		auto specularTextures = loadMaterialTextures(material, aiTextureType_SPECULAR, TEXTURE_SPECULAR);
-		textures.insert(textures.end(), diffuseTextures.begin(), diffuseTextures.end());
-		textures.insert(textures.end(), specularTextures.begin(), specularTextures.end());
+		auto diffuseTextures = loadMaterialTextures(material, aiTextureType_DIFFUSE);
+		auto specularTextures = loadMaterialTextures(material, aiTextureType_SPECULAR);
+		auto ambientTextures = loadMaterialTextures(material, aiTextureType_AMBIENT);
+
+		mesh_material.pushDiffuseTexture(diffuseTextures);
+		mesh_material.pushSpecularTexture(specularTextures);
+		mesh_material.pushAmbientTexture(ambientTextures);
+
+		if (!material->Get(AI_MATKEY_COLOR_AMBIENT, col))
+			mesh_material.setAmbientColor(glm::vec3(col.r, col.g, col.b));
+		if (!material->Get(AI_MATKEY_COLOR_SPECULAR, col))
+			mesh_material.setSpecularColor(glm::vec3(col.r, col.g, col.b));
+		if (!material->Get(AI_MATKEY_COLOR_DIFFUSE, col))
+			mesh_material.setDiffuseColor(glm::vec3(col.r, col.g, col.b));
+
+		material->Get(AI_MATKEY_SHININESS, mesh_material.shininess);
+		material->Get(AI_MATKEY_SHININESS_STRENGTH, mesh_material.shininess_strength);
 	}
 
 
-	Mesh my_mesh = Mesh(vertices, indices, textures, this->shaderprog);
+	Mesh my_mesh = Mesh(vertices, indices, mesh_material, this->shaderprog);
 	my_mesh.realize();
 	return my_mesh;
 }

src/openglshader.cpp

@@ -208,6 +208,11 @@ void OpenGlShaderProgram::setUniformVec4(const std::string &uniform, const glm::
 	}
 }
 
+void OpenGlShaderProgram::setUniformBool(const std::string &uniform, bool value)
+{
+	this->setUniformInt(uniform, value ? 1 : 0);
+}
+
 int OpenGlShaderProgram::getUniformLoc(const std::string &uniform)
 {
 	if (!this->compiled)

src/opengltexture.cpp

@@ -4,7 +4,7 @@
 #include <stb/stb_image.h>
 #include <iostream>
 
-OpenGlTexture::OpenGlTexture(TextureType type, const std::string &texture_path)
+OpenGlTexture::OpenGlTexture(const std::string &texture_path)
 {
 	glGenTextures(1, &this->texture);
 	glBindTexture(GL_TEXTURE_2D, this->texture);
@@ -12,11 +12,11 @@ OpenGlTexture::OpenGlTexture(TextureType type, const std::string &texture_path)
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-	this->type = type;
 	this->texture_path = texture_path;
+	this->blend = 1.0f;
 }
 
-OpenGlTexture::OpenGlTexture() : OpenGlTexture(TEXTURE_DIFFUSE, "")
+OpenGlTexture::OpenGlTexture() : OpenGlTexture("")
 {
 
 }
@@ -79,7 +79,3 @@ const std::string &OpenGlTexture::getPath()
 	return this->texture_path;
 }
 
-TextureType OpenGlTexture::getType()
-{
-	return this->type;
-}