Cleanup: gpu docs
This commit is contained in:
Campbell Barton
parent
5f21030a81
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@ -4,7 +4,8 @@ Geometry Batches
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Geometry is drawn in batches.
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A batch contains the necessary data to perform the drawing.
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That includes an obligatory *Vertex Buffer* and an optional *Index Buffer*, each of which is described in more detail in the following sections.
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That includes an obligatory *Vertex Buffer* and an optional *Index Buffer*,
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each of which is described in more detail in the following sections.
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A batch also defines a draw type.
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Typical draw types are `POINTS`, `LINES` and `TRIS`.
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The draw type determines how the data will be interpreted and drawn.
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@ -12,25 +13,29 @@ The draw type determines how the data will be interpreted and drawn.
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Vertex Buffers
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++++++++++++++
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A *Vertex Buffer Object* (VBO) (:class:`gpu.types.GPUVertBuf`) is an array that contains the vertex attributes needed for drawing using a specific shader.
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A *Vertex Buffer Object* (VBO) (:class:`gpu.types.GPUVertBuf`)
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is an array that contains the vertex attributes needed for drawing using a specific shader.
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Typical vertex attributes are *location*, *normal*, *color*, and *uv*.
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Every vertex buffer has a *Vertex Format* (:class:`gpu.types.GPUVertFormat`) and a length corresponding to the number of vertices in the buffer.
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Every vertex buffer has a *Vertex Format* (:class:`gpu.types.GPUVertFormat`)
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and a length corresponding to the number of vertices in the buffer.
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A vertex format describes the attributes stored per vertex and their types.
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The following code demonstrates the creation of a vertex buffer that contains 6 vertices.
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For each vertex 2 attributes will be stored: The position and the normal::
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For each vertex 2 attributes will be stored: The position and the normal.
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import gpu
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vertex_positions = [(0, 0, 0), ...]
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vertex_normals = [(0, 0, 1), ...]
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.. code-block:: python
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fmt = gpu.types.GPUVertFormat()
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fmt.attr_add(id="pos", comp_type='F32', len=3, fetch_mode='FLOAT')
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fmt.attr_add(id="normal", comp_type='F32', len=3, fetch_mode='FLOAT')
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import gpu
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vertex_positions = [(0, 0, 0), ...]
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vertex_normals = [(0, 0, 1), ...]
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vbo = gpu.types.GPUVertBuf(len=6, format=fmt)
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vbo.attr_fill(id="pos", data=vertex_positions)
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vbo.attr_fill(id="normal", data=vertex_normals)
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fmt = gpu.types.GPUVertFormat()
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fmt.attr_add(id="pos", comp_type='F32', len=3, fetch_mode='FLOAT')
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fmt.attr_add(id="normal", comp_type='F32', len=3, fetch_mode='FLOAT')
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vbo = gpu.types.GPUVertBuf(len=6, format=fmt)
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vbo.attr_fill(id="pos", data=vertex_positions)
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vbo.attr_fill(id="normal", data=vertex_normals)
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This vertex buffer could be used to draw 6 points, 3 separate lines, 5 consecutive lines, 2 separate triangles, ...
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E.g. in the case of lines, each two consecutive vertices define a line.
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@ -42,19 +47,24 @@ Index Buffers
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Often triangles and lines share one or more vertices.
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With only a vertex buffer one would have to store all attributes for the these vertices multiple times.
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This is very inefficient because in a connected triangle mesh every vertex is used 6 times on average.
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A more efficient approach would be to use an *Index Buffer* (IBO) (:class:`gpu.types.GPUIndexBuf`), sometimes referred to as *Element Buffer*.
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A more efficient approach would be to use an *Index Buffer* (IBO) (:class:`gpu.types.GPUIndexBuf`),
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sometimes referred to as *Element Buffer*.
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An *Index Buffer* is an array that references vertices based on their index in the vertex buffer.
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For instance, to draw a rectangle composed of two triangles, one could use an index buffer::
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positions = (
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(-1, 1), (1, 1),
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(-1, -1), (1, -1))
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For instance, to draw a rectangle composed of two triangles, one could use an index buffer.
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indices = ((0, 1, 2), (2, 1, 3))
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.. code-block:: python
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ibo = gpu.types.GPUIndexBuf(type='TRIS', seq=indices)
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positions = (
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(-1, 1), (1, 1),
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(-1, -1), (1, -1))
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Here the first tuple in `indices` describes which vertices should be used for the first triangle (same for the second tuple).
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indices = ((0, 1, 2), (2, 1, 3))
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ibo = gpu.types.GPUIndexBuf(type='TRIS', seq=indices)
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Here the first tuple in `indices` describes which vertices should be used for the first triangle
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(same for the second tuple).
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Note how the diagonal vertices 1 and 2 are shared between both triangles.
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Shaders
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@ -66,7 +76,8 @@ The most important ones are *Vertex Shaders* and *Fragment Shaders*.
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Typically multiple shaders are linked together into a *Program*.
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However, in the Blender Python API the term *Shader* refers to an OpenGL Program.
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Every :class:`gpu.types.GPUShader` consists of a vertex shader, a fragment shader and an optional geometry shader.
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For common drawing tasks there are some built-in shaders accessible from :class:`gpu.shader.from_builtin` with an identifier such as `2D_UNIFORM_COLOR` or `3D_FLAT_COLOR`.
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For common drawing tasks there are some built-in shaders accessible from :class:`gpu.shader.from_builtin`
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with an identifier such as `2D_UNIFORM_COLOR` or `3D_FLAT_COLOR`.
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Every shader defines a set of attributes and uniforms that have to be set in order to use the shader.
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Attributes are properties that are set using a vertex buffer and can be different for individual vertices.
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@ -89,14 +100,18 @@ Offscreen Rendering
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+++++++++++++++++++
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What one can see on the screen after rendering is called the *Front Buffer*.
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When draw calls are issued, batches are drawn on a *Back Buffer* that will only be displayed when all drawing is done and the current back buffer will become the new front buffer.
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Sometimes, one might want to draw the batches into a distinct buffer that could be used as texture to display on another object or to be saved as image on disk.
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When draw calls are issued, batches are drawn on a *Back Buffer* that will only be displayed
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when all drawing is done and the current back buffer will become the new front buffer.
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Sometimes, one might want to draw the batches into a distinct buffer that could be used as
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texture to display on another object or to be saved as image on disk.
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This is called Offscreen Rendering.
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In Blender Offscreen Rendering is done using the :class:`gpu.types.GPUOffScreen` type.
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.. warning::
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`GPUOffScreen` objects are bound to the OpenGL context they have been created in.
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This means that once Blender discards this context (i.e. the window is closed), the offscreen instance will be freed.
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`GPUOffScreen` objects are bound to the OpenGL context they have been created in.
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This means that once Blender discards this context (i.e. the window is closed),
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the offscreen instance will be freed.
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Examples
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++++++++
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@ -104,4 +119,4 @@ Examples
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To try these examples, just copy them into Blenders text editor and execute them.
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To keep the examples relatively small, they just register a draw function that can't easily be removed anymore.
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Blender has to be restarted in order to delete the draw handlers.
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"""
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"""
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@ -3,7 +3,8 @@ Rendering the 3D View into a Texture
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------------------------------------
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The scene has to have a camera for this example to work.
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You could also make this independent of a specific camera, but Blender does not expose good functions to create view and projection matrices yet.
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You could also make this independent of a specific camera,
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but Blender does not expose good functions to create view and projection matrices yet.
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"""
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import bpy
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import bgl
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@ -15,6 +16,7 @@ HEIGHT = 256
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offscreen = gpu.types.GPUOffScreen(WIDTH, HEIGHT)
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def draw():
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context = bpy.context
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scene = context.scene
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@ -35,4 +37,5 @@ def draw():
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bgl.glDisable(bgl.GL_DEPTH_TEST)
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draw_texture_2d(offscreen.color_texture, (10, 10), WIDTH, HEIGHT)
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_PIXEL')
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_PIXEL')
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@ -3,8 +3,9 @@ Custom Shader for dotted 3D Line
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--------------------------------
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In this example the arc length (distance to the first point on the line) is calculated in every vertex.
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Between the vertex and fragment shader that value is automatically interpolated for all points that will be visible on the screen.
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In the fragment shader the `sin` of the arc length is calculated.
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Between the vertex and fragment shader that value is automatically interpolated
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for all points that will be visible on the screen.
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In the fragment shader the ``sin`` of the arc length is calculated.
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Based on the result a decision is made on whether the fragment should be drawn or not.
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"""
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import bpy
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@ -47,9 +48,11 @@ for a, b in zip(coords[:-1], coords[1:]):
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arc_lengths.append(arc_lengths[-1] + (a - b).length)
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shader = gpu.types.GPUShader(vertex_shader, fragment_shader)
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batch = batch_for_shader(shader, 'LINE_STRIP',
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{"position" : coords,
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"arcLength" : arc_lengths})
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batch = batch_for_shader(
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shader, 'LINE_STRIP',
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{"position": coords, "arcLength": arc_lengths},
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)
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def draw():
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shader.bind()
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@ -58,4 +61,5 @@ def draw():
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shader.uniform_float("u_Scale", 10)
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batch.draw(shader)
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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@ -8,12 +8,13 @@ from gpu_extras.batch import batch_for_shader
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coords = [(1, 1, 1), (-2, 0, 0), (-2, -1, 3), (0, 1, 1)]
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shader = gpu.shader.from_builtin('3D_UNIFORM_COLOR')
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batch = batch_for_shader(shader, 'LINES', {"pos" : coords})
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batch = batch_for_shader(shader, 'LINES', {"pos": coords})
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def draw():
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shader.bind()
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shader.uniform_float("color", (1, 1, 0, 1))
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batch.draw(shader)
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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@ -32,7 +32,8 @@ fragment_shader = '''
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coords = [(1, 1, 1), (2, 0, 0), (-2, -1, 3)]
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shader = gpu.types.GPUShader(vertex_shader, fragment_shader)
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batch = batch_for_shader(shader, 'TRIS', {"position" : coords})
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batch = batch_for_shader(shader, 'TRIS', {"position": coords})
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def draw():
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shader.bind()
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@ -41,4 +42,5 @@ def draw():
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shader.uniform_float("brightness", 0.5)
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batch.draw(shader)
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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@ -7,10 +7,10 @@ import gpu
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from gpu_extras.batch import batch_for_shader
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coords = (
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(-1, -1, -1), ( 1, -1, -1),
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(-1, 1, -1), ( 1, 1, -1),
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(-1, -1, 1), ( 1, -1, 1),
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(-1, 1, 1), ( 1, 1, 1))
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(-1, -1, -1), (+1, -1, -1),
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(-1, +1, -1), (+1, +1, -1),
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(-1, -1, +1), (+1, -1, +1),
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(-1, +1, +1), (+1, +1, +1))
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indices = (
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(0, 1), (0, 2), (1, 3), (2, 3),
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@ -18,11 +18,13 @@ indices = (
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(0, 4), (1, 5), (2, 6), (3, 7))
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shader = gpu.shader.from_builtin('3D_UNIFORM_COLOR')
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batch = batch_for_shader(shader, 'LINES', {"pos" : coords}, indices=indices)
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batch = batch_for_shader(shader, 'LINES', {"pos": coords}, indices=indices)
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def draw():
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shader.bind()
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shader.uniform_float("color", (1, 0, 0, 1))
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batch.draw(shader)
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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@ -14,20 +14,23 @@ mesh.calc_loop_triangles()
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vertices = np.empty((len(mesh.vertices), 3), 'f')
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indices = np.empty((len(mesh.loop_triangles), 3), 'i')
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mesh.vertices.foreach_get("co",
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np.reshape(vertices, len(mesh.vertices) * 3))
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mesh.loop_triangles.foreach_get("vertices",
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np.reshape(indices, len(mesh.loop_triangles) * 3))
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mesh.vertices.foreach_get(
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"co", np.reshape(vertices, len(mesh.vertices) * 3))
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mesh.loop_triangles.foreach_get(
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"vertices", np.reshape(indices, len(mesh.loop_triangles) * 3))
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vertex_colors = [(random(), random(), random(), 1) for _ in range(len(mesh.vertices))]
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shader = gpu.shader.from_builtin('3D_SMOOTH_COLOR')
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batch = batch_for_shader(shader, 'TRIS',
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{"pos" : vertices,
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"color" : vertex_colors},
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indices=indices)
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batch = batch_for_shader(
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shader, 'TRIS',
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{"pos": vertices, "color": vertex_colors},
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indices=indices,
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)
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def draw():
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batch.draw(shader)
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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@ -14,11 +14,13 @@ indices = (
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(0, 1, 2), (2, 1, 3))
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shader = gpu.shader.from_builtin('2D_UNIFORM_COLOR')
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batch = batch_for_shader(shader, 'TRIS', {"pos" : vertices}, indices=indices)
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batch = batch_for_shader(shader, 'TRIS', {"pos": vertices}, indices=indices)
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def draw():
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shader.bind()
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shader.uniform_float("color", (0, 0.5, 0.5, 1.0))
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batch.draw(shader)
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_PIXEL')
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_PIXEL')
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@ -13,13 +13,18 @@ IMAGE_NAME = "Untitled"
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image = bpy.data.images[IMAGE_NAME]
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shader = gpu.shader.from_builtin('2D_IMAGE')
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batch = batch_for_shader(shader, 'TRI_FAN',
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{"pos" : ((100, 100), (200, 100), (200, 200), (100, 200)),
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"texCoord" : ((0, 0), (1, 0), (1, 1), (0, 1))})
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batch = batch_for_shader(
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shader, 'TRI_FAN',
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{
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"pos": ((100, 100), (200, 100), (200, 200), (100, 200)),
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"texCoord": ((0, 0), (1, 0), (1, 1), (0, 1)),
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},
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)
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if image.gl_load():
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raise Exception()
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def draw():
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bgl.glActiveTexture(bgl.GL_TEXTURE0)
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bgl.glBindTexture(bgl.GL_TEXTURE_2D, image.bindcode)
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@ -28,4 +33,5 @@ def draw():
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shader.uniform_int("image", 0)
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batch.draw(shader)
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_PIXEL')
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_PIXEL')
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@ -2,10 +2,10 @@
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Generate a texture using Offscreen Rendering
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--------------------------------------------
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1. Create an :class:`gpu.types.GPUOffScreen` object.
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2. Draw some circles into it.
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3. Make a new shader for drawing a planar texture in 3D.
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4. Draw the generated texture using the new shader.
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#. Create an :class:`gpu.types.GPUOffScreen` object.
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#. Draw some circles into it.
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#. Make a new shader for drawing a planar texture in 3D.
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#. Draw the generated texture using the new shader.
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"""
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import bpy
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import gpu
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@ -63,9 +63,13 @@ fragment_shader = '''
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'''
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shader = gpu.types.GPUShader(vertex_shader, fragment_shader)
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batch = batch_for_shader(shader, 'TRI_FAN',
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{"position" : ((-1, -1), (1, -1), (1, 1), (-1, 1)),
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"uv" : ((0, 0), (1, 0), (1, 1), (0, 1))})
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batch = batch_for_shader(
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shader, 'TRI_FAN',
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{
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"position": ((-1, -1), (1, -1), (1, 1), (-1, 1)),
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"uv": ((0, 0), (1, 0), (1, 1), (0, 1)),
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},
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)
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def draw():
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@ -78,4 +82,5 @@ def draw():
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shader.uniform_float("image", 0)
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batch.draw(shader)
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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@ -6,7 +6,8 @@ This will create a new image with the given name.
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If it already exists, it will override the existing one.
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Currently almost all of the execution time is spent in the last line.
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In the future this will hopefully be solved by implementing the Python buffer protocol for `bgl.Buffer` and `Image.pixels` (aka `bpy_prop_array`).
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In the future this will hopefully be solved by implementing the Python buffer protocol
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for :class:`bgl.Buffer` and :class:`bpy.types.Image.pixels` (aka ``bpy_prop_array``).
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"""
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import bpy
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import gpu
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@ -35,7 +36,6 @@ with offscreen.bind():
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(random.uniform(-1, 1), random.uniform(-1, 1)),
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(1, 1, 1, 1), random.uniform(0.1, 1), 20)
|
||||
|
||||
|
||||
buffer = bgl.Buffer(bgl.GL_BYTE, WIDTH * HEIGHT * 4)
|
||||
bgl.glReadBuffer(bgl.GL_BACK)
|
||||
bgl.glReadPixels(0, 0, WIDTH, HEIGHT, bgl.GL_RGBA, bgl.GL_UNSIGNED_BYTE, buffer)
|
||||
|
|
@ -47,4 +47,4 @@ if not IMAGE_NAME in bpy.data.images:
|
|||
bpy.data.images.new(IMAGE_NAME, WIDTH, HEIGHT)
|
||||
image = bpy.data.images[IMAGE_NAME]
|
||||
image.scale(WIDTH, HEIGHT)
|
||||
image.pixels = [v / 255 for v in buffer]
|
||||
image.pixels = [v / 255 for v in buffer]
|
||||
|
|
|
|||
|
|
@ -4,32 +4,33 @@ Built-in shaders
|
|||
|
||||
All built-in shaders have the ``mat4 ModelViewProjectionMatrix`` uniform.
|
||||
The value of it can only be modified using the :class:`gpu.matrix` module.
|
||||
"""
|
||||
|
||||
2D_UNIFORM_COLOR:
|
||||
attributes: vec3 pos
|
||||
uniforms: vec4 color
|
||||
attributes: vec3 pos
|
||||
uniforms: vec4 color
|
||||
|
||||
2D_FLAT_COLOR:
|
||||
attributes: vec3 pos, vec4 color
|
||||
uniforms: -
|
||||
attributes: vec3 pos, vec4 color
|
||||
uniforms: -
|
||||
|
||||
2D_SMOOTH_COLOR:
|
||||
attributes: vec3 pos, vec4 color
|
||||
uniforms: -
|
||||
attributes: vec3 pos, vec4 color
|
||||
uniforms: -
|
||||
|
||||
2D_IMAGE:
|
||||
attributes: vec3 pos, vec2 texCoord
|
||||
uniforms: sampler2D image
|
||||
attributes: vec3 pos, vec2 texCoord
|
||||
uniforms: sampler2D image
|
||||
|
||||
3D_UNIFORM_COLOR:
|
||||
attributes: vec3 pos
|
||||
uniforms: vec4 color
|
||||
attributes: vec3 pos
|
||||
uniforms: vec4 color
|
||||
|
||||
3D_FLAT_COLOR:
|
||||
attributes: vec3 pos, vec4 color
|
||||
uniforms: -
|
||||
attributes: vec3 pos, vec4 color
|
||||
uniforms: -
|
||||
|
||||
3D_SMOOTH_COLOR:
|
||||
attributes: vec3 pos, vec4 color
|
||||
uniforms: -
|
||||
attributes: vec3 pos, vec4 color
|
||||
uniforms: -
|
||||
|
||||
"""
|
||||
|
|
|
|||
Loading…
Reference in New Issue