$4.[20$ points$]$ As discussed in the class, the following code sends the position and color of three vertices $($forming a triangle$)$ to the GPU and sets up attributes $0($position$)$ and $1($color$).$

$```$

void SendData$()$

$\{$

GLfloat vertsPos$[]=$

$1$

$+0\mathrm{.}0$f$,+0\mathrm{.}0$f$,+0\mathrm{.}0$f$,$

$+1\mathrm{.}0$f$,+1\mathrm{.}0$f$,+0\mathrm{.}0$f$,$

$-1\mathrm{.}0$f$,+1\mathrm{.}0$f$,+0\mathrm{.}0$f

$\}$;

glGenBuffers$(1,$ &vpbufferiD$)$;

glBindBuffer$($GL$\_$ARRAY$\_$BUFFER, vpbufferID$)$;

glBufferData$($GL$\_$ARRAY$\_$BUFFER, sizeof$($vertsPos$),$ vertsPos, GL$\_$STATIC$\_$DRAW$)$;

glEnableVertexAttribArray$(0)$;

GLfloat vertsCol$[]=$

$1$

$+1\mathrm{.}0$f$,+0\mathrm{.}0$f$,+0\mathrm{.}0$f$,$

$+0\mathrm{.}0$f$,+0\mathrm{.}0$f$,+1\mathrm{.}0$f$,$

$+0\mathrm{.}0$f$,+1\mathrm{.}0$f$,+0\mathrm{.}0$f

$\}$;

glGenBuffers$(1,$ &vcbufferlD$)$;

glBindBuffer$($GL$\_$ARRAY$\_$BUFFER, vcbufferID$)$;

glBufferData$($GL$\_$ARRAY$\_$BUFFER, sizeof$($vertsCol$),$ vertsCol, GL$\_$STATIC$\_$DRAW$)$;

glEnableVertexAttribArray$(1)$;

$\}$

$```$

The Display function $($below$)$ will then draw a triangle with the provided position and color on the screen.

$```$

void Display$()$

$\{$

glBindBuffer$($GL$\_$ARRAY$\_$BUFFER, vpbufferID$)$;

glVertexAltribPointer$(0,3,$ GL$\_$FLOAT, GL$\_$FALSE, $0,0)$;

glBindBuffer$($GL$\_$ARRAY$\_$BUFFER, vcbufferID$)$;

glVertexAttribPointer$(1,3,$ GL$\_$FLOAT, GL$\_$FALSE, $0,0)$;

gIDrawArrays$($GL$\_$TRIANGLES, $0,6)$;

$\}$

$```$ Now let's say we change the Display code as follows. Note that the only difference is that the glBindBuffer functions are removed.

$```$

void Display$()$

$\{$

gIVertexAltribPointer$(0,3,$ GL$\_$FLOAT, GL$\_$FALSE, $0,0)$;

glVertexAttribPointer$(1,3,$ GL$\_$FLOAT, GL$\_$FALSE, $0,0)$;

glDrawArrays$($GL$\_$TRIANGLES, $0,6)$;

$\}$

$```$

a$)[10$ points$]$ Explain what happens in this case. Which arrays will be assigned to attributes $0($position$)$ and $1($color$)?$

b$)[10$ points$]$ Draw the outcome inside the orange box. Make sure you indicate the color of each vertex.