Commit 0557d0a4 authored by Brian Paul's avatar Brian Paul

progs/trivial: added comments

parent fecd4cde
......@@ -77,6 +77,7 @@ static void Draw(void)
glStencilFunc(GL_ALWAYS, 1, 1);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
/* red triangle (setting stencil to 1) */
glColor3ub(200, 0, 0);
glBegin(GL_POLYGON);
glVertex3i(-4, -4, 0);
......@@ -88,6 +89,7 @@ static void Draw(void)
glStencilFunc(GL_EQUAL, 1, 1);
glStencilOp(GL_INCR, GL_KEEP, GL_DECR);
/* green quad (if over red, decr stencil to 0, else incr to 1) */
glColor3ub(0, 200, 0);
glBegin(GL_POLYGON);
glVertex3i(3, 3, 0);
......@@ -101,6 +103,7 @@ static void Draw(void)
glStencilFunc(GL_EQUAL, 1, 1);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
/* blue quad (where stencil == 1) */
glColor3ub(0, 0, 200);
glBegin(GL_POLYGON);
glVertex3f(2.5, 2.5, 0);
......
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