things are rendering

CMakeLists.txt

@@ -8,5 +8,5 @@ set(CMAKE_CXX_FLAGS "-g -lncurses -I/usr/include/freetype2")
 file(GLOB_RECURSE SOURCES src/*.cpp)
 
 add_executable(FastNuclearSim ${SOURCES})
-target_link_libraries(FastNuclearSim PUBLIC stdc++ m GLEW glfw GL freetype)
+target_link_libraries(FastNuclearSim PUBLIC stdc++ m GLEW glfw GL freetype assimp)
 

src/graphics/arrays.cpp

@@ -4,6 +4,7 @@
 
 #include <assimp/Importer.hpp>
 
+#include "shader.hpp"
 #include "arrays.hpp"
 #include "font.hpp"
 
@@ -16,46 +17,9 @@ static void* ptr_diff(void* a, void* b)
 	return (void*)((size_t)a - (size_t)b);
 }
 
-void processNode(aiNode *node, const aiScene *scene)
-{
-	
-}
-
-Mesh processMesh(aiMesh *mesh, const aiScene *scene)
-{
-	
-}
-
-unsigned int arrays::init()
+void arrays::vertex_attrib_pointers()
 {
 	vertex v;
-	unsigned long handle = font::chars['*'].handle;
-
-	Assimp::Importer importer;
-	const aiScene *scene = importer.ReadFile("monkey.obj", aiProcess_Triangulate | aiProcess_FlipUVs);
-
-	arrays::vertex vertices[4] = {
-		{handle, {0.0f, 1.0f}, {-0.5f, -0.5f, 0.0f}},
-		{handle, {0.0f, 0.0f}, {-0.5f,  0.5f, 0.0f}},
-		{handle, {1.0f, 1.0f}, { 0.5f, -0.5f, 0.0f}},
-		{handle, {1.0f, 0.0f}, { 0.5f,  0.5f, 0.0f}}
-	};
-
-	int indices[6] = {
-		0, 1, 3, 0, 2, 3
-	};
-
-	glGenVertexArrays(1, &vao);
-	glBindVertexArray(vao);
-
-	glGenBuffers(1, &vbo);
-	glGenBuffers(1, &ebo);
-
-	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);
 	
 	glVertexAttribLPointer(0, 1, GL_UNSIGNED_INT64_ARB, sizeof(v), ptr_diff(&v.texid, &v));
 	glEnableVertexAttribArray(0);
@@ -65,7 +29,5 @@ unsigned int arrays::init()
 
 	glVertexAttribPointer(2, 3, GL_FLOAT, false, sizeof(v), ptr_diff(&v.pos, &v));
 	glEnableVertexAttribArray(2);
-
-	return vao;
 }
 

src/graphics/arrays.hpp

@@ -9,12 +9,15 @@ namespace sim::graphics::arrays
 
 struct vertex
 {
-	unsigned long texid;
-	glm::vec2 texpos;
-	glm::vec3 pos;
+	unsigned long texid = 0;
+	glm::vec2 texpos = {0, 0};
+	glm::vec3 pos = {0, 0, 0};
+
+	vertex() { }
+	vertex(unsigned long texid, glm::vec2 texpos, glm::vec3 pos) : texid(texid), texpos(texpos), pos(pos) { }
 };
 
-unsigned int init();
+void vertex_attrib_pointers();
 
 };
 

src/graphics/model.cpp

@@ -0,0 +1,122 @@
+
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+
+#include <assimp/Importer.hpp>
+#include <assimp/scene.h>
+#include <assimp/postprocess.h>
+
+#include <vector>
+
+#include "model.hpp"
+#include "arrays.hpp"
+
+using namespace sim::graphics;
+
+model::model()
+{
+	
+}
+
+model::~model()
+{
+	if(vbo) glDeleteBuffers(1, &vbo);
+	if(ebo) glDeleteBuffers(1, &ebo);
+	if(vao) glDeleteVertexArrays(1, &vao);
+}
+
+void model::alloc()
+{
+	glGenVertexArrays(1, &vao);
+	glGenBuffers(1, &vbo);
+	glGenBuffers(1, &ebo);
+
+	glBindVertexArray(vao);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+
+	arrays::vertex_attrib_pointers();
+}
+
+void model::load_vbo(const arrays::vertex* data, size_t size, int mode)
+{
+	glBufferData(GL_ARRAY_BUFFER, size * sizeof(data[0]), data, mode);
+}
+
+void model::load_ebo(const unsigned int* data, size_t size, int mode)
+{
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, size * sizeof(data[0]), data, mode);
+	this->size = size;
+}
+
+struct proc_state
+{
+	size_t at = 0;
+	std::vector<arrays::vertex> vertices;
+	std::vector<unsigned int> indices;
+};
+
+static void proc_mesh(proc_state& state, aiMesh* mesh, const aiScene* scene)
+{
+	for(unsigned int i = 0; i < mesh->mNumVertices; i++)
+	{
+		arrays::vertex vertex;
+
+		vertex.pos = {mesh->mVertices[i].x, mesh->mVertices[i].y, mesh->mVertices[i].z};
+
+		state.vertices.push_back(vertex);
+	}
+
+	unsigned int at = state.at;
+
+	for(unsigned int i = 0; i < mesh->mNumFaces; i++)
+	{
+		aiFace face = mesh->mFaces[i];
+		unsigned int j;
+		
+		for(j = 0; j < face.mNumIndices; j++)
+		{
+			state.indices.push_back(face.mIndices[j] + state.at);
+		}
+
+		at += j;
+	}
+
+	state.at = at;
+}
+
+static void proc_node(proc_state& state, aiNode* node, const aiScene* scene)
+{
+	for(size_t i = 0; i < node->mNumMeshes; i++)
+	{
+		aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
+		proc_mesh(state, mesh, scene);
+	}
+
+	for(size_t i = 0; i < node->mNumChildren; i++)
+	{
+		proc_node(state, node->mChildren[i], scene);
+	}
+}
+
+void model::load(const char* path)
+{
+	proc_state state;
+	Assimp::Importer importer;
+	const aiScene *scene = importer.ReadFile(path, aiProcess_Triangulate | aiProcess_FlipUVs);
+	proc_node(state, scene->mRootNode, scene);
+
+	load_vbo(&state.vertices[0], state.vertices.size(), GL_STATIC_DRAW);
+	load_ebo(&state.indices[0], state.indices.size(), GL_STATIC_DRAW);
+}
+
+void model::bind()
+{
+	glBindVertexArray(vao);
+}
+
+void model::render()
+{
+	glDrawElements(GL_TRIANGLES, size, GL_UNSIGNED_INT, 0);
+}
+

src/graphics/model.hpp

@@ -0,0 +1,25 @@
+
+#pragma once
+
+#include "arrays.hpp"
+
+namespace sim::graphics
+{
+
+struct model
+{
+	unsigned int vao = 0, vbo = 0, ebo = 0, size = 0;
+
+	model();
+	~model();
+
+	void bind();
+	void alloc();
+	void load(const char* path);
+	void load_vbo(const arrays::vertex* data, size_t size, int mode);
+	void load_ebo(const unsigned int* data, size_t size, int mode);
+	void render();
+};
+
+};
+

src/graphics/resize.cpp

@@ -17,6 +17,16 @@ static int win_restore_h;
 static int win_restore_x;
 static int win_restore_y;
 
+glm::vec2 resize::get_size()
+{
+	return {win_w, win_h};
+}
+
+double resize::get_aspect()
+{
+	return win_w / win_h;
+}
+
 void resize::toggle_fullscreen()
 {
 	GLFWwindow* win = window::get_window();

src/graphics/resize.hpp

@@ -1,11 +1,15 @@
 
 #pragma once
 
+#include <glm/vec2.hpp>
+
 namespace sim::graphics::resize
 {
 
 void init();
 void toggle_fullscreen();
+glm::vec2 get_size();
+double get_aspect();
 
 };
 

src/graphics/shader.cpp

@@ -17,14 +17,20 @@ layout (location = 0) in sampler2D aTex;
 layout (location = 1) in vec2 aTexPos;
 layout (location = 2) in vec3 aPos;
 
+uniform mat4 model;
+uniform mat4 projection;
+
 out flat sampler2D tex;
 out vec2 texPos;
+out float zVal;
 
 void main()
 {
-	gl_Position = vec4(aPos, 1.0);
+	vec4 pos = model * vec4(aPos, 1.0);
+	gl_Position = projection * pos;
 	texPos = aTexPos;
 	tex = aTex;
+	zVal = 8.0f / (pos.z * pos.z);
 }
 
 )";
@@ -35,6 +41,7 @@ static const char* FRAGMENT_SHADER = R"(
 
 in flat sampler2D tex;
 in vec2 texPos;
+in float zVal;
 
 out vec4 FragColour;
 
@@ -44,7 +51,7 @@ uniform mat4 tex_mat;
 void main()
 {
 	vec4 texdata = do_tex ? texture2D(tex, texPos) : vec4(1);
-	FragColour = tex_mat * texdata;
+	FragColour = tex_mat * texdata * vec4(zVal, zVal, zVal, 1);
 }
 
 )";
@@ -53,6 +60,8 @@ static unsigned int prog_id;
 
 int shader::gl_tex_mat;
 int shader::gl_do_tex;
+int shader::gl_model;
+int shader::gl_projection;
 
 static int load_shader(const char** src, int type)
 {
@@ -87,6 +96,8 @@ unsigned int shader::init_program()
 	
 	gl_tex_mat = glGetUniformLocation(prog_id, "tex_mat");
 	gl_do_tex = glGetUniformLocation(prog_id, "do_tex");
+	gl_model = glGetUniformLocation(prog_id, "model");
+	gl_projection = glGetUniformLocation(prog_id, "projection");
 
 	glUseProgram(prog_id);
 	glDeleteShader(vsh_id);

src/graphics/shader.hpp

@@ -6,6 +6,8 @@ namespace sim::graphics::shader
 
 extern int gl_tex_mat;
 extern int gl_do_tex;
+extern int gl_model;
+extern int gl_projection;
 
 unsigned int init_program();
 

src/graphics/window.cpp

@@ -3,9 +3,12 @@
 #include <GLFW/glfw3.h>
 
 #include <glm/matrix.hpp>
+#include <glm/ext/matrix_transform.hpp> // glm::translate, glm::rotate, glm::scale
+#include <glm/ext/matrix_clip_space.hpp> // glm::perspective
 
 #include <iostream>
 
+#include "model.hpp"
 #include "arrays.hpp"
 #include "keyboard.hpp"
 #include "resize.hpp"
@@ -17,6 +20,7 @@ using namespace sim::graphics;
 
 static GLFWwindow* win;
 static bool win_should_close = false;
+static model Model;
 
 void GLAPIENTRY cb_debug_message(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const void* userParam)
 {
@@ -56,29 +60,41 @@ void window::create()
 	keyboard::init();
 	resize::init();
 	font::init();
-
 	shader::init_program();
-	arrays::init();
+
+	Model.alloc();
+	Model.load("monkey.obj");
 
 	glViewport(0, 0, 800, 600);
 }
 
 void window::loop()
 {
-	glClearColor(0.2f, 0.3f, 0.5f, 1.0f);
+	glClearColor(0, 0, 0, 1.0f);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-	glm::mat4 m = {
+	glm::mat4 mat_colour = {
 		1, 1, 1, 1,
 		0, 0, 0, 0,
 		0, 0, 0, 0,
 		0, 0, 0, 0
 	};
 
-	glUniformMatrix4fv(shader::gl_tex_mat, 1, false, &m[0][0]);
-	glUniform1i(shader::gl_do_tex, 1);
+	glm::mat4 mat_model = glm::mat4(1.0f);
 	
-	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+	mat_model = glm::translate(mat_model, glm::vec3(0.0f, 0.0f, -5.0f));
+//	mat_model = glm::scale(mat_model, glm::vec3(1.0f) * 0.05f);
+	mat_model = glm::rotate(mat_model, float(M_PI * 0.125), glm::vec3(1, 1, 1));
+	
+	glm::mat4 mat_projection = glm::perspective(float(M_PI * 0.25), (float)resize::get_aspect(), 0.1f, 100.f);
+
+	glUniformMatrix4fv(shader::gl_tex_mat, 1, false, &mat_colour[0][0]);
+	glUniformMatrix4fv(shader::gl_projection, 1, false, &mat_projection[0][0]);
+	glUniformMatrix4fv(shader::gl_model, 1, false, &mat_model[0][0]);
+	glUniform1i(shader::gl_do_tex, 0);
+	
+	Model.bind();
+	Model.render();
 
 	glfwSwapBuffers(win);
 	glfwPollEvents();