From 4f82475251d47b6416d865f94299ef25ca701da9 Mon Sep 17 00:00:00 2001
From: Jay Robson <jsrobson10@gmail.com>
Date: Sun, 21 Jan 2024 12:58:37 +1100
Subject: [PATCH] adding models

---
 src/graphics/arrays.cpp | 15 +++++++++++++++
 src/graphics/shader.cpp | 12 +++++++++++-
 src/graphics/shader.hpp |  3 +++
 src/graphics/window.cpp | 21 +++++++++++++++++++--
 4 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/src/graphics/arrays.cpp b/src/graphics/arrays.cpp
index 62447f9..41aae77 100644
--- a/src/graphics/arrays.cpp
+++ b/src/graphics/arrays.cpp
@@ -2,6 +2,8 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 
+#include <assimp/Importer.hpp>
+
 #include "arrays.hpp"
 #include "font.hpp"
 
@@ -14,11 +16,24 @@ 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()
 {
 	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}},
diff --git a/src/graphics/shader.cpp b/src/graphics/shader.cpp
index 66a0e02..7784dc1 100644
--- a/src/graphics/shader.cpp
+++ b/src/graphics/shader.cpp
@@ -38,15 +38,22 @@ in vec2 texPos;
 
 out vec4 FragColour;
 
+uniform bool do_tex;
+uniform mat4 tex_mat;
+
 void main()
 {
-	FragColour = vec4(1) * texture2D(tex, texPos);
+	vec4 texdata = do_tex ? texture2D(tex, texPos) : vec4(1);
+	FragColour = tex_mat * texdata;
 }
 
 )";
 
 static unsigned int prog_id;
 
+int shader::gl_tex_mat;
+int shader::gl_do_tex;
+
 static int load_shader(const char** src, int type)
 {
 	int id = glCreateShader(type);
@@ -77,6 +84,9 @@ unsigned int shader::init_program()
 		window::close();
 		return 0;
 	}
+	
+	gl_tex_mat = glGetUniformLocation(prog_id, "tex_mat");
+	gl_do_tex = glGetUniformLocation(prog_id, "do_tex");
 
 	glUseProgram(prog_id);
 	glDeleteShader(vsh_id);
diff --git a/src/graphics/shader.hpp b/src/graphics/shader.hpp
index 63999c6..ad15fe8 100644
--- a/src/graphics/shader.hpp
+++ b/src/graphics/shader.hpp
@@ -4,6 +4,9 @@
 namespace sim::graphics::shader
 {
 
+extern int gl_tex_mat;
+extern int gl_do_tex;
+
 unsigned int init_program();
 
 };
diff --git a/src/graphics/window.cpp b/src/graphics/window.cpp
index 68ce88b..4032059 100644
--- a/src/graphics/window.cpp
+++ b/src/graphics/window.cpp
@@ -2,6 +2,8 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 
+#include <glm/matrix.hpp>
+
 #include <iostream>
 
 #include "arrays.hpp"
@@ -27,7 +29,7 @@ void window::create()
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
 	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
-//	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, true);
+	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, true);
 	glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, true);
 
 	win = glfwCreateWindow(800, 600, "FastNuclearSim", nullptr, nullptr);
@@ -45,6 +47,10 @@ void window::create()
 
 	glEnable(GL_DEBUG_OUTPUT);
 	glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
+	glEnable(GL_DEPTH_TEST);
+	glEnable(GL_BLEND);
+
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	glDebugMessageCallback(cb_debug_message, nullptr);
 
 	keyboard::init();
@@ -59,8 +65,19 @@ void window::create()
 
 void window::loop()
 {
-	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+	glClearColor(0.2f, 0.3f, 0.5f, 1.0f);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+	glm::mat4 m = {
+		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);
+	
 	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
 
 	glfwSwapBuffers(win);