3D View: draw clipping region

Only for workbench solid/wire modes.

1 files changed, 35 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_view.c b/source/blender/draw/intern/draw_view.c
index 2d5dbac5dd5..027eda05933 100644
--- a/source/blender/draw/intern/draw_view.c
+++ b/source/blender/draw/intern/draw_view.c
@@ -126,6 +126,41 @@ void DRW_draw_background(void)
 	}
 }
 
+GPUBatch *DRW_draw_background_clipping_batch_from_rv3d(const RegionView3D *rv3d)
+{
+	const BoundBox *bb = rv3d->clipbb;
+	const uint clipping_index[6][4] = {
+		{0, 1, 2, 3},
+		{0, 4, 5, 1},
+		{4, 7, 6, 5},
+		{7, 3, 2, 6},
+		{1, 5, 6, 2},
+		{7, 4, 0, 3}
+	};
+	GPUVertBuf *vbo;
+	GPUIndexBuf *el;
+	GPUIndexBufBuilder elb = {0};
+
+	/* Elements */
+	GPU_indexbuf_init(&elb, GPU_PRIM_TRIS, ARRAY_SIZE(clipping_index) * 2, ARRAY_SIZE(bb->vec));
+	for (int i = 0; i < ARRAY_SIZE(clipping_index); i++) {
+		const uint *idx = clipping_index[i];
+		GPU_indexbuf_add_tri_verts(&elb, idx[0], idx[1], idx[2]);
+		GPU_indexbuf_add_tri_verts(&elb, idx[0], idx[2], idx[3]);
+	}
+	el = GPU_indexbuf_build(&elb);
+
+	GPUVertFormat format = {0};
+	uint pos_id = GPU_vertformat_attr_add(&format, "pos", GPU_COMP_F32, 3, GPU_FETCH_FLOAT);
+
+	vbo = GPU_vertbuf_create_with_format(&format);
+	GPU_vertbuf_data_alloc(vbo, ARRAY_SIZE(bb->vec));
+	GPU_vertbuf_attr_fill(vbo, pos_id, bb->vec);
+
+	return GPU_batch_create_ex(GPU_PRIM_TRIS, vbo, el, GPU_BATCH_OWNS_VBO | GPU_BATCH_OWNS_INDEX);
+}
+
+
 /* **************************** 3D Cursor ******************************** */
 
 static bool is_cursor_visible(const DRWContextState *draw_ctx, Scene *scene, ViewLayer *view_layer)