Add PBVH debug display, where we can see the PBVH node bounding boxes.

To enable enter debug value 14.
Leaf nodes are green while container nodes are red.

1 files changed, 62 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_buffers.c b/source/blender/gpu/intern/gpu_buffers.c
index df6aa4d868d..9bf63d2fe29 100644
--- a/source/blender/gpu/intern/gpu_buffers.c
+++ b/source/blender/gpu/intern/gpu_buffers.c
@@ -2657,3 +2657,65 @@ void GPU_free_pbvh_buffers(GPU_PBVH_Buffers *buffers)
 		MEM_freeN(buffers);
 	}
 }
+
+
+/* debug function, draws the pbvh BB */
+void GPU_draw_pbvh_BB(float min[3], float max[3], bool leaf)
+{
+	float quads[4][4][3] = {
+	    {
+	        {min[0], min[1], min[2]},
+	        {max[0], min[1], min[2]},
+	        {max[0], min[1], max[2]},
+	        {min[0], min[1], max[2]}
+	    },
+
+	    {
+	        {min[0], min[1], min[2]},
+	        {min[0], max[1], min[2]},
+	        {min[0], max[1], max[2]},
+	        {min[0], min[1], max[2]}
+	    },
+
+	    {
+	        {max[0], max[1], min[2]},
+	        {max[0], min[1], min[2]},
+	        {max[0], min[1], max[2]},
+	        {max[0], max[1], max[2]}
+	    },
+
+	    {
+	        {max[0], max[1], min[2]},
+	        {min[0], max[1], min[2]},
+	        {min[0], max[1], max[2]},
+	        {max[0], max[1], max[2]}
+	    },
+	};
+
+	if (leaf)
+		glColor4f(0.0, 1.0, 0.0, 0.5);
+	else
+		glColor4f(1.0, 0.0, 0.0, 0.5);
+
+	glVertexPointer(3, GL_FLOAT, 0, &quads[0][0][0]);
+	glDrawArrays(GL_QUADS, 0, 16);
+}
+
+void GPU_init_draw_pbvh_BB(void)
+{
+	glPushAttrib(GL_ENABLE_BIT);
+	glDisable(GL_CULL_FACE);
+	glEnableClientState(GL_VERTEX_ARRAY);
+	glDisableClientState(GL_COLOR_ARRAY);
+	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	glDisable(GL_LIGHTING);
+	glDisable(GL_COLOR_MATERIAL);
+	glEnable(GL_BLEND);
+	glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
+}
+
+void GPU_end_draw_pbvh_BB(void)
+{
+	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+	glPopAttrib();
+}