Added Batch3D

src/graphics/Batch3D.cpp

@@ -0,0 +1,165 @@
+#include "Batch3D.h"
+
+#include "Mesh.h"
+#include "Texture.h"
+
+#include <GL/glew.h>
+
+#define VERTEX_SIZE 9
+
+Batch3D::Batch3D(size_t capacity) : capacity(capacity), offset(0), color(1.0f, 1.0f, 1.0f, 1.0f){
+	const int attrs[] = {
+			3, 2, 4, 0 //null terminator
+	};
+
+	buffer = new float[capacity * VERTEX_SIZE];
+	mesh = new Mesh(buffer, 0, attrs);
+	index = 0;
+
+	unsigned char pixels[] = {
+			255, 255, 255, 255,
+	};
+	blank = new Texture(pixels, 1, 1);
+	_texture = nullptr;
+}
+
+Batch3D::~Batch3D(){
+	delete blank;
+	delete[] buffer;
+	delete mesh;
+}
+
+void Batch3D::begin(){
+	_texture = nullptr;
+	blank->bind();
+}
+
+void Batch3D::vertex(float x, float y, float z, float u, float v,
+		float r, float g, float b, float a) {
+	buffer[index++] = x;
+	buffer[index++] = y;
+	buffer[index++] = z;
+	buffer[index++] = u;
+	buffer[index++] = v;
+	buffer[index++] = r;
+	buffer[index++] = g;
+	buffer[index++] = b;
+	buffer[index++] = a;
+}
+void Batch3D::vertex(vec3 point,
+		vec2 uvpoint,
+		float r, float g, float b, float a) {
+	buffer[index++] = point.x;
+	buffer[index++] = point.y;
+	buffer[index++] = point.z;
+	buffer[index++] = uvpoint.x;
+	buffer[index++] = uvpoint.y;
+	buffer[index++] = r;
+	buffer[index++] = g;
+	buffer[index++] = b;
+	buffer[index++] = a;
+}
+
+void Batch3D::texture(Texture* new_texture){
+	if (_texture == new_texture)
+		return;
+	render();
+	_texture = new_texture;
+	if (new_texture == nullptr)
+		blank->bind();
+	else
+		new_texture->bind();
+}
+
+void Batch3D::sprite(vec3 pos, vec3 up, vec3 right, float w, float h){
+	const float r = color.r;
+	const float g = color.g;
+	const float b = color.b;
+	const float a = color.a;
+	if (index + 6*VERTEX_SIZE >= capacity)
+		render();
+
+	vertex(pos.x - right.x * w - up.x * h,
+			pos.y - right.y * w - up.y * h,
+			pos.z - right.z * w - up.z * h,
+			0, 0,
+			r,g,b,a);
+
+	vertex(pos.x + right.x * w + up.x * h,
+			pos.y + right.y * w + up.y * h,
+			pos.z + right.z * w + up.z * h,
+			1, 1,
+			r,g,b,a);
+
+	vertex(pos.x - right.x * w - up.x * h,
+			pos.y + right.y * w + up.y * h,
+			pos.z - right.z * w - up.z * h,
+			0, 1,
+			r,g,b,a);
+
+	vertex(pos.x - right.x * w - up.x * h,
+			pos.y - right.y * w - up.y * h,
+			pos.z - right.z * w - up.z * h,
+			0, 0,
+			r,g,b,a);
+
+	vertex(pos.x + right.x * w + up.x * h,
+			pos.y - right.y * w - up.y * h,
+			pos.z + right.z * w + up.z * h,
+			1, 0,
+			r,g,b,a);
+
+	vertex(pos.x + right.x * w + up.x * h,
+			pos.y + right.y * w + up.y * h,
+			pos.z + right.z * w + up.z * h,
+			1, 1,
+			r,g,b,a);
+}
+
+void Batch3D::sprite(vec3 pos, vec3 up, vec3 right, float w, float h, int atlasRes, int index, vec4 tint){
+	float scale = 1.0f / (float)atlasRes;
+	float u = (index % atlasRes) * scale;
+	float v = 1.0f - ((index / atlasRes) * scale) - scale;
+
+	vertex(pos.x - right.x * w - up.x * h,
+			pos.y - right.y * w - up.y * h,
+			pos.z - right.z * w - up.z * h,
+			u, v,
+			tint.r,tint.g,tint.b,tint.a);
+
+	vertex(pos.x + right.x * w + up.x * h,
+			pos.y + right.y * w + up.y * h,
+			pos.z + right.z * w + up.z * h,
+			u+scale, v+scale,
+			tint.r,tint.g,tint.b,tint.a);
+
+	vertex(pos.x - right.x * w - up.x * h,
+			pos.y + right.y * w + up.y * h,
+			pos.z - right.z * w - up.z * h,
+			u, v+scale,
+			tint.r,tint.g,tint.b,tint.a);
+
+	vertex(pos.x - right.x * w - up.x * h,
+			pos.y - right.y * w - up.y * h,
+			pos.z - right.z * w - up.z * h,
+			u, v,
+			tint.r,tint.g,tint.b,tint.a);
+
+	vertex(pos.x + right.x * w + up.x * h,
+			pos.y - right.y * w - up.y * h,
+			pos.z + right.z * w + up.z * h,
+			u+scale, v,
+			tint.r,tint.g,tint.b,tint.a);
+
+	vertex(pos.x + right.x * w + up.x * h,
+			pos.y + right.y * w + up.y * h,
+			pos.z + right.z * w + up.z * h,
+			u+scale, v+scale,
+			tint.r,tint.g,tint.b,tint.a);
+}
+
+void Batch3D::render() {
+	mesh->reload(buffer, index / VERTEX_SIZE);
+	mesh->draw(GL_TRIANGLES);
+	index = 0;
+}