Bitmap: Make #get_pixel/#set_pixel more accurate

This gets rid of the "batch/flush" semantics for #set_pixel
and instead just directly uploads the pixel color to the
texture, circumventing the float conversion entirely.
Also makes a lot of code simpler in many places as calling
'flush()' is no longer required for bitmaps.

src/quadarray.h

@@ -110,67 +110,4 @@ struct ColorQuadArray
 	}
 };
 
-struct PointArray
-{
-	std::vector<Vertex> vertices;
-	VBO::ID vbo;
-	VAO::ID vao;
-
-	PointArray()
-	{
-		vbo = VBO::gen();
-		vao = VAO::gen();
-
-		VAO::bind(vao);
-		VBO::bind(vbo);
-
-		glEnableVertexAttribArray(Shader::Color);
-		glEnableVertexAttribArray(Shader::Position);
-
-		glVertexAttribPointer(Shader::Color,    4, GL_FLOAT, GL_FALSE, sizeof(Vertex), Vertex::colorOffset());
-		glVertexAttribPointer(Shader::Position, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), Vertex::posOffset());
-
-		VAO::unbind();
-		VBO::unbind();
-	}
-
-	~PointArray()
-	{
-		VBO::del(vbo);
-		VAO::del(vao);
-	}
-
-	void append(const Vec2 &pos, const Vec4 &color)
-	{
-		Vertex vert;
-		vert.pos = pos;
-		vert.color = color;
-		vertices.push_back(vert);
-	}
-
-	void commit()
-	{
-		VBO::bind(vbo);
-		VBO::uploadData(vertices.size() * sizeof(Vertex), &vertices[0]);
-		VBO::unbind();
-	}
-
-	void reset()
-	{
-		vertices.clear();
-	}
-
-	void draw()
-	{
-		VAO::bind(vao);
-		glDrawArrays(GL_POINTS, 0, count());
-		VAO::unbind();
-	}
-
-	int count()
-	{
-		return vertices.size();
-	}
-};
-
 #endif // QUADARRAY_H