From 4ea6917468ec82c966a2f67db0b0b6f375d8d9d4 Mon Sep 17 00:00:00 2001
From: Mike Erwin <significant.bit@gmail.com>
Date: Thu, 20 Oct 2016 14:33:32 -0400
Subject: [PATCH] OpenGL: box & circle outline functions that work with 3D
 position (z=0)

New immediate mode API is strict about attribute formats. These new functions make existing code easier to port.

Supports T49043
---
 source/blender/editors/include/BIF_glutil.h |  6 ++++++
 source/blender/editors/screen/glutil.c      | 22 +++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/source/blender/editors/include/BIF_glutil.h b/source/blender/editors/include/BIF_glutil.h
index 30718ccd18d..7045340d070 100644
--- a/source/blender/editors/include/BIF_glutil.h
+++ b/source/blender/editors/include/BIF_glutil.h
@@ -92,6 +92,9 @@ void glutil_draw_filled_arc(float start, float angle, float radius, int nsegment
  */
 void imm_draw_lined_circle(unsigned pos, float x, float y, float radius, int nsegments);
 
+/* use this version when VertexFormat has a vec3 position */
+void imm_draw_lined_circle_3D(unsigned pos, float x, float y, float radius, int nsegments);
+
 /**
  * Draw a filled circle with the given \a radius.
  * The circle is centered at \a x, \a y and drawn in the XY plane.
@@ -115,6 +118,9 @@ void imm_draw_filled_circle(unsigned pos, float x, float y, float radius, int ns
 */
 void imm_draw_line_box(unsigned pos, float x1, float y1, float x2, float y2);
 
+/* use this version when VertexFormat has a vec3 position */
+void imm_draw_line_box_3D(unsigned pos, float x1, float y1, float x2, float y2);
+
 /**
 * Pack color into 3 bytes
 *
diff --git a/source/blender/editors/screen/glutil.c b/source/blender/editors/screen/glutil.c
index a7e8c210335..b64152b111b 100644
--- a/source/blender/editors/screen/glutil.c
+++ b/source/blender/editors/screen/glutil.c
@@ -203,6 +203,17 @@ void imm_draw_filled_circle(unsigned pos, float x, float y, float rad, int nsegm
 	imm_draw_circle(GL_TRIANGLE_FAN, pos, x, y, rad, nsegments);
 }
 
+void imm_draw_lined_circle_3D(unsigned pos, float x, float y, float rad, int nsegments)
+{
+	immBegin(GL_LINE_LOOP, nsegments);
+	for (int i = 0; i < nsegments; ++i) {
+		float angle = 2 * M_PI * ((float)i / (float)nsegments);
+		immVertex3f(pos, x + rad * cosf(angle),
+		                 y + rad * sinf(angle), 0.0f);
+	}
+	immEnd();
+}
+
 void imm_draw_line_box(unsigned pos, float x1, float y1, float x2, float y2)
 {
 	immBegin(GL_LINE_LOOP, 4);
@@ -213,6 +224,17 @@ void imm_draw_line_box(unsigned pos, float x1, float y1, float x2, float y2)
 	immEnd();
 }
 
+void imm_draw_line_box_3D(unsigned pos, float x1, float y1, float x2, float y2)
+{
+	/* use this version when VertexFormat has a vec3 position */
+	immBegin(GL_LINE_LOOP, 4);
+	immVertex3f(pos, x1, y1, 0.0f);
+	immVertex3f(pos, x1, y2, 0.0f);
+	immVertex3f(pos, x2, y2, 0.0f);
+	immVertex3f(pos, x2, y1, 0.0f);
+	immEnd();
+}
+
 void imm_cpack(unsigned int x)
 {
 	immUniformColor3ub(((x)& 0xFF),