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src/graphics/LineBatch.cpp

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+/*
+ * LineBatch.cpp
+ *
+ *  Created on: Jun 25, 2020
+ *      Author: MihailRis
+ */
+
+#include "LineBatch.h"
+#include "Mesh.h"
+
+#include <GL/glew.h>
+
+#define LB_VERTEX_SIZE (3+4)
+
+LineBatch::LineBatch(size_t capacity) : capacity(capacity) {
+	int attrs[] = {3,4, 0};
+	buffer = new float[capacity * LB_VERTEX_SIZE * 2];
+	mesh = new Mesh(buffer, 0, attrs);
+	index = 0;
+}
+
+LineBatch::~LineBatch(){
+	delete[] buffer;
+	delete mesh;
+}
+
+void LineBatch::line(float x1, float y1, float z1, float x2, float y2, float z2,
+		float r, float g, float b, float a) {
+	buffer[index] = x1;
+	buffer[index+1] = y1;
+	buffer[index+2] = z1;
+	buffer[index+3] = r;
+	buffer[index+4] = g;
+	buffer[index+5] = b;
+	buffer[index+6] = a;
+	index += LB_VERTEX_SIZE;
+
+	buffer[index] = x2;
+	buffer[index+1] = y2;
+	buffer[index+2] = z2;
+	buffer[index+3] = r;
+	buffer[index+4] = g;
+	buffer[index+5] = b;
+	buffer[index+6] = a;
+	index += LB_VERTEX_SIZE;
+}
+
+void LineBatch::box(float x, float y, float z, float w, float h, float d,
+		float r, float g, float b, float a) {
+	w *= 0.5f;
+	h *= 0.5f;
+	d *= 0.5f;
+
+	line(x-w, y-h, z-d, x+w, y-h, z-d, r,g,b,a);
+	line(x-w, y+h, z-d, x+w, y+h, z-d, r,g,b,a);
+	line(x-w, y-h, z+d, x+w, y-h, z+d, r,g,b,a);
+	line(x-w, y+h, z+d, x+w, y+h, z+d, r,g,b,a);
+
+	line(x-w, y-h, z-d, x-w, y+h, z-d, r,g,b,a);
+	line(x+w, y-h, z-d, x+w, y+h, z-d, r,g,b,a);
+	line(x-w, y-h, z+d, x-w, y+h, z+d, r,g,b,a);
+	line(x+w, y-h, z+d, x+w, y+h, z+d, r,g,b,a);
+
+	line(x-w, y-h, z-d, x-w, y-h, z+d, r,g,b,a);
+	line(x+w, y-h, z-d, x+w, y-h, z+d, r,g,b,a);
+	line(x-w, y+h, z-d, x-w, y+h, z+d, r,g,b,a);
+	line(x+w, y+h, z-d, x+w, y+h, z+d, r,g,b,a);
+}
+
+void LineBatch::render(){
+	if (index == 0)
+		return;
+	mesh->reload(buffer, index / LB_VERTEX_SIZE);
+	mesh->draw(GL_LINES);
+	index = 0;
+}