add test cube

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "vendor/glfw"]
 	path = vendor/glfw
 	url = https://github.com/glfw/glfw
+[submodule "vendor/cglm"]
+	path = vendor/cglm
+	url = https://github.com/recp/cglm

CMakeLists.txt

@@ -6,6 +6,7 @@ cmake_minimum_required (VERSION 3.8)
 project ("schroedinger-solver")
 
 add_subdirectory("vendor/glfw")
+add_subdirectory("vendor/cglm")
 add_subdirectory("vendor/glad")
 
 # Include sub-projects.

src/CMakeLists.txt

@@ -11,9 +11,11 @@ add_executable(solver
 	"renderer/context.c"
 	"renderer/buffer.c" 
 	"renderer/shader.c"
+	"renderer/camera.c"
 )
 
 target_link_libraries(solver PRIVATE
 	glfw
 	glad
+	cglm
 )

src/application.c

@@ -4,9 +4,15 @@
 #include <errno.h>
 
 #include <GLFW/glfw3.h>
+#include <cglm/affine.h>
 
 #include "renderer/context.h"
 
+static void on_window_size_change(Application* app, int width, int height)
+{
+	set_camera_perspective(&app->camera, 90.0f, (float)width / (float)height);
+}
+
 static void destroy_application(Application* app)
 {
 	assert(app);
@@ -20,25 +26,49 @@ int init_application(Application* app, const char* name)
 	assert(app);
 	glfwInit();
 
-	app->window = create_managed_window(name, 800, 800);
-	if (app->window == NULL) {
+	if (create_managed_window(&app->window, name, 800, 800) != 0)
+	{
+		destroy_application(app);
 		return 1;
 	}
 
+	app->window.user_data = app;
+	app->window.on_size_change = on_window_size_change;
+
 	// Create quad for testing
 	create_vao(&app->object);
 
 	float vertices[] = {
-		-0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f,
-		-0.5f,  0.5f, 0.0f, 0.0f, 1.0f, 0.0f,
-		 0.5f,  0.5f, 0.0f, 0.0f, 0.0f, 1.0f,
-		 0.5f, -0.5f, 0.0f, 0.0f, 0.0f, 0.0f
+		-0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,	// front bottom left
+		-0.5f,  0.5f, -0.5f, 0.0f, 1.0f, 0.0f,	// front top left
+		 0.5f,  0.5f, -0.5f, 0.0f, 0.0f, 1.0f,	// front top right
+		 0.5f, -0.5f, -0.5f, 1.0f, 1.0f, 1.0f,	// front bottom right
+
+		-0.5f, -0.5f,  0.5f, 1.0f, 1.0f, 1.0f,	// back bottom left
+		-0.5f,  0.5f,  0.5f, 1.0f, 0.0f, 0.0f,	// back top left
+		 0.5f,  0.5f,  0.5f, 0.0f, 1.0f, 0.0f,	// back top right
+		 0.5f, -0.5f,  0.5f, 0.0f, 0.0f, 1.0f,	// back bottom right
 	};
 	attach_vertex_buffer(&app->object, vertices, sizeof(vertices));
 
 	unsigned indices[] = {
-		0, 1, 2,
-		0, 2, 3
+		0, 1, 2,	// front
+		0, 2, 3,
+
+		3, 2, 6,	// right
+		3, 6, 7,
+		
+		4, 5, 1,	// left
+		4, 1, 0,
+
+		7, 6, 5,	// back
+		7, 5, 4,
+
+		1, 5, 6,	// top
+		1, 6, 2,
+
+		4, 0, 3,	// bottom	
+		4, 3, 7
 	};
 	attach_element_buffer(&app->object, indices, sizeof(indices));
 
@@ -56,9 +86,13 @@ int init_application(Application* app, const char* name)
 		""
 		"out vec3 i_col;"
 		""
+		"uniform mat4 model;"
+		"uniform mat4 view;"
+		"uniform mat4 projection;"
+		""
 		"void main() {"
 		"	i_col = col;"
-		"	gl_Position = vec4(pos, 1.0);"
+		"	gl_Position = projection * view * model * vec4(pos, 1.0);"
 		"}",
 
 		"#version 460 core\n"
@@ -76,21 +110,39 @@ int init_application(Application* app, const char* name)
 		return 1;
 	}
 
+	if (create_camera(&app->camera) != 0)
+	{
+		destroy_application(app);
+		return 1;
+	}
+
+	glm_mat4_identity(app->model);
+
+	ctx_enable(GL_DEPTH_TEST);
+	ctx_front_face(GL_CW);
+
 	return 0;
 }
 
 int launch_application(Application* app) 
 {
-	while (!glfwWindowShouldClose(app->window))
+	while (!glfwWindowShouldClose(app->window.window))
 	{
 		glfwPollEvents();
 
+		// rotate cube
+		glm_rotate(app->model, 0.03f, (vec3) { 0.0f, 1.0f, 0.0f });
+
 		ctx_clear_screen(0.3f, 0.1f, 0.8f, 1.0f);
 
 		bind_shader(app->shader);
+		set_uniform_mat4(app->shader, "model", app->model);
+		set_uniform_mat4(app->shader, "view", app->camera.view);
+		set_uniform_mat4(app->shader, "projection", app->camera.projection);
+
 		ctx_draw_elements(&app->object);
 
-		glfwSwapBuffers(app->window);
+		glfwSwapBuffers(app->window.window);
 	}
 
 	destroy_application(app);

src/application.h

@@ -4,13 +4,16 @@
 #include "renderer/window.h"
 #include "renderer/buffer.h"
 #include "renderer/shader.h"
+#include "renderer/camera.h"
 
 typedef struct Application 
 {
-	GLFWwindow* window;
+	Window window;
 
 	VertexArrayObject object;
 	int shader;
+	Camera camera;
+	mat4 model;
 } Application;
 
 int init_application(Application* app, const char* name);

src/renderer/camera.c

@@ -0,0 +1,23 @@
+#include "camera.h"
+
+#include <cglm/affine.h>
+#include <cglm/cam.h>
+#include <assert.h>
+
+int create_camera(Camera* camera)
+{
+	assert(camera);
+
+	glm_mat4_identity(camera->view);
+	glm_rotate(camera->view, glm_rad(35.0f), (vec3) { 1.0f, 0.0f, 0.0f });
+	glm_translate(camera->view, (vec3) { 0.0f, -1.0f, -2.0f });
+
+	glm_perspective(glm_rad(90.0f), 1.0f, 0.001f, 100.0f, camera->projection);
+
+	return 0;
+}
+
+void set_camera_perspective(Camera* camera, float fov, float ar)
+{
+	glm_perspective(glm_rad(fov), ar, 0.01f, 100.0f, camera->projection);
+}

src/renderer/camera.h

@@ -0,0 +1,15 @@
+#ifndef CAMERA_H
+#define CAMERA_H
+
+#include <cglm/mat4.h>
+
+typedef struct Camera
+{
+	mat4 view;
+	mat4 projection;
+} Camera;
+
+int create_camera(Camera* camera);
+void set_camera_perspective(Camera* camera, float fov, float ar);
+
+#endif // CAMERA_H

src/renderer/context.c

@@ -18,7 +18,7 @@ void ctx_viewport(int x, int y, int w, int h)
 void ctx_clear_screen(float r, float g, float b, float a)
 {
 	glClearColor(r, g, b, a);
-	glClear(GL_COLOR_BUFFER_BIT);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 }
 
 void ctx_draw_elements(VertexArrayObject* vao)
@@ -26,3 +26,13 @@ void ctx_draw_elements(VertexArrayObject* vao)
 	bind_vao(*vao);
 	glDrawElements(GL_TRIANGLES, vao->elements, GL_UNSIGNED_INT, (void*)0);
 }
+
+void ctx_enable(int feature)
+{
+	glEnable(feature);
+}
+
+void ctx_front_face(int front)
+{
+	glFrontFace(front);
+}

src/renderer/context.h

@@ -6,6 +6,8 @@ typedef struct VertexArrayObject VertexArrayObject;
 int ctx_init();
 
 void ctx_viewport(int x, int y, int w, int h);
+void ctx_enable(int feature);
+void ctx_front_face(int front);
 
 void ctx_clear_screen(float r, float g, float b, float a);
 void ctx_draw_elements(VertexArrayObject* vao);

src/renderer/shader.c

@@ -91,4 +91,10 @@ void destroy_shader(int shader)
 void bind_shader(int shader)
 {
 	glUseProgram(shader);
+}
+
+void set_uniform_mat4(int shader, const char* name, mat4 mat)
+{
+	int location = glGetUniformLocation(shader, name);
+	glUniformMatrix4fv(location, 1, GL_FALSE, (float*)mat);
 }

src/renderer/shader.h

@@ -1,9 +1,12 @@
 #ifndef SHADER_H
 #define SHADER_H
 
+#include <cglm/mat4.h>
+
 int create_shader(const char* vertex_shader_code, const char* fragment_shader_code);
 void destroy_shader(int shader);
 
 void bind_shader(int shader);
+void set_uniform_mat4(int shader, const char* name, mat4 mat);
 
 #endif // SHADER_H

src/renderer/window.c

@@ -1,6 +1,8 @@
 #include "window.h"
 
 #include <stdio.h>
+#include <assert.h>
+
 #include <GLFW/glfw3.h>
 
 #include "context.h"
@@ -8,28 +10,39 @@
 void default_framebuffer_size_callback(GLFWwindow* window, int vw, int vh) 
 {
 	ctx_viewport(0, 0, vw, vh);
+
+	Window* managed = (Window*)glfwGetWindowUserPointer(window);
+	if (managed->on_size_change)
+	{
+		managed->on_size_change(managed->user_data, vw, vh);
+	}
 }
 
-GLFWwindow* create_managed_window(const char* title, int width, int height) 
+int create_managed_window(Window* window, const char* title, int width, int height)
 {
-	GLFWwindow* window = glfwCreateWindow(width, height, title, NULL, NULL);
+	assert(window);
+
+	window->window = glfwCreateWindow(width, height, title, NULL, NULL);
 	if (window == NULL) {
 		const char* error;
 		int error_code = glfwGetError(&error);
 
 		fprintf(stderr, "Failed to create window (%d): %s\n", error_code, error);
-		return NULL;
+		return error_code;
 	}
 
-	glfwMakeContextCurrent(window);
+	glfwMakeContextCurrent(window->window);
 	ctx_init();
 
-	glfwSetFramebufferSizeCallback(window, default_framebuffer_size_callback);
+	glfwSetFramebufferSizeCallback(window->window, default_framebuffer_size_callback);
+	
+	glfwSetWindowUserPointer(window->window, (void*)window);
+	window->on_size_change = NULL;
 
-	return window;
+	return 0;
 }
 
-void destroy_window(GLFWwindow* window)
+void destroy_window(Window window)
 {
-	glfwDestroyWindow(window);
+	glfwDestroyWindow(window.window);
 }

src/renderer/window.h

@@ -3,7 +3,14 @@
 
 typedef struct GLFWwindow GLFWwindow;
 
-GLFWwindow* create_managed_window(const char* title, int width, int height);
-void destroy_window(GLFWwindow* window);
+typedef struct Window
+{
+	GLFWwindow* window;
+	void(*on_size_change)(void*, int, int);
+	void* user_data;
+} Window;
+
+int create_managed_window(Window* window, const char* title, int width, int height);
+void destroy_window(Window window);
 
 #endif // WINDOW_H

vendor/cglm

@@ -0,0 +1 @@
+Subproject commit 199d1fa031f8d71c72f79f4a46de7ee064fc1a72