refactoring how Input works

src/Input.c

@@ -2,7 +2,7 @@
 
 extern float pos[3];
 
-/* 0: escape
+/* 0: nothing 
  * 1: W
  * 2: S
  * 3: A
@@ -10,27 +10,26 @@ extern float pos[3];
  */
 
 static bool pressed[5];
-
+static int index;
 void key_pressed(GLFWwindow* window, int key, int scancode, int action, int mods){
-	if ( (key == GLFW_KEY_ESCAPE || key == GLFW_KEY_Q )&& action == GLFW_PRESS) glfwSetWindowShouldClose(window, true);	
+	if ( key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)	glfwSetWindowShouldClose(window, true);		
+	if ( key == GLFW_KEY_Q      && action == GLFW_PRESS )   glfwSetWindowShouldClose(window, true);	
 
-	if ( key == GLFW_KEY_W && action == GLFW_PRESS )    pressed[1] = true;
-	if ( key == GLFW_KEY_W && action == GLFW_RELEASE )  pressed[1] = false;
+    index = 0; 
+    if ( key == GLFW_KEY_W ) index = 1;
+    if ( key == GLFW_KEY_S ) index = 2;
+    if ( key == GLFW_KEY_A ) index = 3;
+    if ( key == GLFW_KEY_D ) index = 4;
 
-	if ( key == GLFW_KEY_S && action == GLFW_PRESS )    pressed[2] = true;
-	if ( key == GLFW_KEY_S && action == GLFW_RELEASE )  pressed[2] = false;	
+    if ( action == GLFW_PRESS )   pressed[index] = true; 
+    if ( action == GLFW_RELEASE ) pressed[index] = false;
+    
 
-	if ( key == GLFW_KEY_A && action == GLFW_PRESS )    pressed[3] = true;
-	if ( key == GLFW_KEY_A && action == GLFW_RELEASE ) 	pressed[3] = false;	
-
-	if ( key == GLFW_KEY_D && action == GLFW_PRESS ) 	pressed[4] = true;
-	if ( key == GLFW_KEY_D && action == GLFW_RELEASE ) 	pressed[4] = false;
 }
 
 void processInput(){
-	if (pressed[1]) pos[1] += 0.01f;
-	if (pressed[2]) pos[1] -= 0.01f;
-	if (pressed[3]) pos[0] -= 0.01f;
-	if (pressed[4]) pos[0] += 0.01f;
-
+	if (pressed[1] == true) pos[1] += 0.01f;	
+	if (pressed[2] == true)	pos[1] -= 0.01f;
+    if (pressed[3] == true) pos[0] -= 0.01f;
+    if (pressed[4] == true) pos[0] += 0.01f;
 }

src/Renderer.c

@@ -109,8 +109,8 @@ unsigned int createShader(char* vertexPath, char* fragmentPath) {
 	fread(vertex_src, sizeof(char), vertex_length, vertex_file );
 	fread(fragment_src, sizeof(char), fragment_length, fragment_file );
 	
-	vertex_src[vertex_length+1] = '\0';
-	fragment_src[fragment_length+1] = '\0';
+	vertex_src[vertex_length] = '\0';
+	fragment_src[fragment_length] = '\0';
 //	printf("%s", vertex_src);
 //	printf("%s", fragment_src);
 
@@ -152,4 +152,10 @@ unsigned int createTexture(char* path){
 	return texture;
 }
 
+void buffercpy(int VBO, void* ptr, int size){
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	void* buffer = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
+	memcpy(buffer, ptr, size);
+	glUnmapBuffer(GL_ARRAY_BUFFER);
+}
 

src/Renderer.h

@@ -20,4 +20,6 @@ unsigned int createShader(char* vertexPath, char* fragmentPath);
 
 unsigned int createTexture(char* path);
 
+
+void buffercpy(int VBO, void* ptr, int size);
 #endif

src/lorenz.c

@@ -7,36 +7,45 @@
 #include <linmath.h>
 #include "Renderer.h"
 #include "Input.h"
+#include "utils.h"
 
 float pos[3] = {0.0f, 0.0f, 0.0f};
 
-float rho=28.0;
-float sigma=10.0;
-float beta=8.0/3.0;
-void lorenzStep(float next[3], vec3 prev, float dt) {
+const int number_points = 10000;
+
+float rho=28.0f;
+float sigma=10.0f;
+float beta=8.0f/3.0f;
+
+void lorenzSolution(vec3* solution, vec3 initial, float dt) {
 	float x, y, z, dx, dy, dz;
-	x = prev[0];
-	y = prev[1];
-	z = prev[2];
+	x = initial[0];
+	y = initial[1];
+	z = initial[2];
 
-	dx = (sigma * (y-x))*dt;
-	dy = (x * (rho - z) -y)*dt;
-	dz = (x*y - beta*z)*dt;
-
-	next[0] = prev[0] + dx;
-	next[1] = prev[1] + dy;
-	next[2] = prev[2] + dz;
+	for (int i=0; i < number_points; ++i) {
+		dx = (sigma * (y-x))*dt;
+		dy = (x * (rho - z) -y)*dt;
+		dz = (x*y - beta*z)*dt;
+		
+		x += dx;
+		y += dy;
+		z += dz;
+		
+		vec3 p = {x, y, z};
+		printf("%f %f %f\n", p[0], p[1], p[2]);
+		memcpy(solution[i], p, sizeof(vec3));
+	}
 }
 
+
 int main(int argc, char *argv[]) {
-	
-	GLFWwindow* window;
-	window = initOpenGL();
+
+	GLFWwindow* window = initOpenGL();
 	glfwSetKeyCallback(window, &key_pressed);
 	
 	// CreateShader
-	unsigned int shader1;
-	shader1 = createShader("assets/shaders/vertex.glsl\0", "assets/shaders/fragment.glsl\0");
+	unsigned int shader1 = createShader("assets/shaders/vertex.glsl\0", "assets/shaders/fragment.glsl\0");
 
 	// Initialise VBO and VAO
 	unsigned int VAO, VBO;
@@ -45,42 +54,47 @@ int main(int argc, char *argv[]) {
 		
 	glBindVertexArray(VAO);
 	glBindBuffer(GL_ARRAY_BUFFER, VBO);
-	glBufferData(GL_ARRAY_BUFFER, 3000* sizeof(vec3), NULL, GL_STREAM_DRAW);
+
+	glBufferData(GL_ARRAY_BUFFER, number_points * sizeof(vec3), NULL, GL_DYNAMIC_DRAW);
 	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0 );
 	glEnableVertexAttribArray(0);
 
-	// Projection Matrix
+	// Projection and View Matrix
 	mat4x4 proj;
-	mat4x4_identity(proj);
-	mat4x4_ortho(proj, 0.0, 400.0, 0.0, 400.0, 0.1, 100.0);
+	mat4x4_ortho(proj, -100.0, 100.0, -100.0, 100.0, -100.0, 100.0);
+	mat4x4 view;
+	vec3 camera_position = {0.0f, 0.0f, 0.3f};
+	vec3 look_at = {0.0f,0.0f,0.0f};
+	vec3 up = {0.0f, 1.0f, 0.0f};
+	mat4x4_look_at(view, camera_position, look_at,  up);
 
-	// Uniform Projection Matrix
 	glUseProgram(shader1);
-	int projectionLoc = glGetUniformLocation(shader1, "proj");
-	glUniformMatrix4fv(projectionLoc, 1, GL_FALSE, *proj);
+	int projLoc = glGetUniformLocation(shader1, "proj");
+	glUniformMatrix4fv(projLoc, 1, GL_FALSE, *proj);
+	int viewLoc = glGetUniformLocation(shader1, "view");
+	glUniformMatrix4fv(viewLoc, 1, GL_FALSE, *view);
 	
-	vec3* lorenzPoints = malloc(3000 * sizeof(vec3));
-	memset(lorenzPoints, 0, 3000 * sizeof(vec3));
-	vec3 initial = {0.1f, 0.1f, 0.1f};
-	memcpy(lorenzPoints, initial, sizeof(vec3));
+	// PointsArray
+	vec3* lorenzPoints = malloc(number_points * sizeof(vec3));
+	memset(lorenzPoints, 0, number_points * sizeof(vec3));
+
+	vec3 initial = {1.0f,1.0f,0.0f};
+	float dt = 0.01f;
+
+	lorenzSolution(lorenzPoints, initial, dt);
+
+	buffercpy(VBO, lorenzPoints, sizeof(vec3) * number_points);
 
-	int i=1;
 	while(!glfwWindowShouldClose(window)) {
 		glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
 		glUseProgram(shader1);
-		
-		float increment = 0.1* (float)i;
-		float next[3] = {increment, increment, increment};
-		//lorenzStep(next, lorenzPoints[i], 0.01f);
-		memcpy(lorenzPoints[i++], next, sizeof(vec3));
+		glBindVertexArray(VAO);
+		glBindBuffer(GL_ARRAY_BUFFER, VBO);
 
+		glDrawArrays(GL_LINE_STRIP, 0, number_points);
 
-		float* buff = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
-		memcpy(buff, lorenzPoints, i * sizeof(vec3));
-		glUnmapBuffer(GL_ARRAY_BUFFER);
-
-		glDrawArrays(GL_LINE_STRIP, 0, i);
 		glfwSwapBuffers(window);
 		glfwPollEvents();
 		processInput();
@@ -88,6 +102,7 @@ int main(int argc, char *argv[]) {
 	
 	glDeleteVertexArrays(1, &VAO);
 	glDeleteBuffers(1, &VBO);
+	free(lorenzPoints);
 	glfwTerminate();
 	return 0;
 }

src/utils.c

@@ -0,0 +1,14 @@
+#include "utils.h"
+
+float lerp(float a, float b, float t) {
+	return (1.0f - t) * a + b * t;	
+}
+
+float invLerp(float a, float b, float v){
+	return (v - a) / (b - a);
+}
+
+float remap(float a, float b, float A, float B, float value) {
+	float t = invLerp(a,b,value);
+	return lerp(A,B,t);
+} 

src/utils.h

@@ -0,0 +1,8 @@
+#ifndef UTILS
+#define UTILS
+
+float lerp(float a, float b, float t);
+float invLerp(float a, float b, float value);
+float remap(float a,float b, float A, float B, float value);
+
+#endif