Various improvements

- Added unit tests for the shaders module
- Cleaned up Program
- Cleaned up Buffer
- Buffer now has an easy to use read and write method
- Buffer.orphan now takes a size
- Context now stores commonly used enums such as texture parameters and primitivs modes

- Added Buffer.copy_from_buffer() to have a common place for this operation. buffered_draw_commands will now use this.
- Updated experimental examples

arcade/buffered_draw_commands.py

@@ -569,6 +569,7 @@ def __init__(self):
         """
         Initialize the sprite list
         """
+        # The context this shape list belongs to
         self.ctx = get_window().ctx
         # List of sprites in the sprite list
         self.shape_list = []
@@ -603,19 +604,13 @@ def remove(self, item: TShape):
     def _refresh_shape(self, group):
         # Create a buffer large enough to hold all the shapes buffers
         batch = self.batches[group]
+
         total_vbo_bytes = sum(s.vbo.size for s in batch.items)
         vbo = self.ctx.buffer(reserve=total_vbo_bytes)
         offset = 0
-        gl.glBindBuffer(gl.GL_COPY_WRITE_BUFFER, vbo.buffer_id)
         # Copy all the shapes buffer in our own vbo
         for shape in batch.items:
-            gl.glBindBuffer(gl.GL_COPY_READ_BUFFER, shape.vbo.buffer_id)
-            gl.glCopyBufferSubData(
-                gl.GL_COPY_READ_BUFFER,
-                gl.GL_COPY_WRITE_BUFFER,
-                gl.GLintptr(0),
-                gl.GLintptr(offset),
-                shape.vbo.size)
+            vbo.copy_from_buffer(shape.vbo, offset=offset)
             offset += shape.vbo.size
 
         # Create an index buffer object. It should count starting from 0. We need to

arcade/experimental/shapes_buffered_2_glow.py

@@ -97,8 +97,8 @@ def __init__(self, width, height, title):
 
         arcade.set_background_color(arcade.color.BLACK)
 
-        self.offscreen = shader.Framebuffer(
-            color_attachments=shader.Texture((SCREEN_WIDTH, SCREEN_HEIGHT), 4, wrap_x=gl.GL_CLAMP_TO_EDGE, wrap_y=gl.GL_CLAMP_TO_EDGE))
+        self.offscreen = self.ctx.framebuffer(
+            color_attachments=self.ctx.texture((SCREEN_WIDTH, SCREEN_HEIGHT), 4, wrap_x=gl.GL_CLAMP_TO_EDGE, wrap_y=gl.GL_CLAMP_TO_EDGE))
         self.glow = postprocessing.Glow((SCREEN_WIDTH // 8, SCREEN_HEIGHT // 8))
 
     def on_draw(self):

arcade/experimental/sprite_collect_coins_bloom.py

@@ -164,9 +164,9 @@ def on_draw(self):
             self.blur_fs.program['blur'] = 1
             self.blur_fs.render()
 
-            # self.color_attachment.use(0)
-            # self.quad_fs.program['blur'] = 0
-            # self.quad_fs.render()
+            self.color_attachment.use(0)
+            self.quad_fs.program['blur'] = 0
+            self.quad_fs.render()
 
             self.player_list.draw()