Merge branch 'graphics_buffer_update' of https://github.com/bremco/Cura into bremco-graphics_buffer_update

cura/Layer.py

@@ -43,14 +43,22 @@ class Layer:
         result = 0
         for polygon in self._polygons:
             result += polygon.lineMeshVertexCount()
-
         return result
 
     def lineMeshElementCount(self) -> int:
         result = 0
         for polygon in self._polygons:
             result += polygon.lineMeshElementCount()
+        return result
 
+    def lineMeshCumulativeTypeChangeCount(self, path: int) -> int:
+        result = 0
+        for polygon in self._polygons:
+            num_counts = len(polygon.cumulativeTypeChangeCounts)
+            if path < num_counts:
+                return result + polygon.cumulativeTypeChangeCounts[path]
+            path -= num_counts
+            result += polygon.cumulativeTypeChangeCounts[num_counts - 1]
         return result
 
     def build(self, vertex_offset, index_offset, vertices, colors, line_dimensions, feedrates, extruders, line_types, indices):

cura/LayerDataBuilder.py

@@ -63,6 +63,7 @@ class LayerDataBuilder(MeshBuilder):
         feedrates = numpy.empty((vertex_count), numpy.float32)
         extruders = numpy.empty((vertex_count), numpy.float32)
         line_types = numpy.empty((vertex_count), numpy.float32)
+        vertex_indices = numpy.arange(0, vertex_count, 1, dtype=numpy.float32)
 
         vertex_offset = 0
         index_offset = 0
@@ -109,6 +110,12 @@ class LayerDataBuilder(MeshBuilder):
                 "value": feedrates,
                 "opengl_name": "a_feedrate",
                 "opengl_type": "float"
+                },
+            # Can't use glDrawElements to index (due to oversight in (Py)Qt), can't use gl_PrimitiveID (due to legacy support):
+            "vertex_indices": {
+                "value": vertex_indices,
+                "opengl_name": "a_vertex_index",
+                "opengl_type": "float"
                 }
             }
 

cura/LayerPolygon.py

@@ -55,6 +55,14 @@ class LayerPolygon:
 
         self._jump_mask = self.__jump_map[self._types]
         self._jump_count = numpy.sum(self._jump_mask)
+        self._cumulative_type_change_counts = numpy.zeros(len(self._types))
+        last_type = self.types[0]
+        current_type_count = 0
+        for i in range(0, len(self._cumulative_type_change_counts)):
+            if last_type != self.types[i]:
+                current_type_count += 1
+            last_type = self.types[i]
+            self._cumulative_type_change_counts[i] = current_type_count
         self._mesh_line_count = len(self._types) - self._jump_count
         self._vertex_count = self._mesh_line_count + numpy.sum(self._types[1:] == self._types[:-1])
 
@@ -207,6 +215,10 @@ class LayerPolygon:
     def jumpCount(self):
         return self._jump_count
 
+    @property
+    def cumulativeTypeChangeCounts(self):
+        return self._cumulative_type_change_counts
+
     def getNormals(self) -> numpy.ndarray:
         """Calculate normals for the entire polygon using numpy.