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"""
Generate a texture using Offscreen Rendering
--------------------------------------------
#. Create an :class:`gpu.types.GPUOffScreen` object.
#. Draw some circles into it.
#. Make a new shader for drawing a planar texture in 3D.
#. Draw the generated texture using the new shader.
"""
import bpy
import gpu
from mathutils import Matrix
from gpu_extras.batch import batch_for_shader
from gpu_extras.presets import draw_circle_2d
# Create and fill offscreen
##########################################
offscreen = gpu.types.GPUOffScreen(512, 512)
with offscreen.bind():
fb = gpu.state.active_framebuffer_get()
fb.clear(color=(0.0, 0.0, 0.0, 0.0))
with gpu.matrix.push_pop():
# reset matrices -> use normalized device coordinates [-1, 1]
gpu.matrix.load_matrix(Matrix.Identity(4))
gpu.matrix.load_projection_matrix(Matrix.Identity(4))
amount = 10
for i in range(-amount, amount + 1):
x_pos = i / amount
draw_circle_2d((x_pos, 0.0), (1, 1, 1, 1), 0.5, segments=200)
# Drawing the generated texture in 3D space
#############################################
vert_out = gpu.types.GPUStageInterfaceInfo("my_interface")
vert_out.smooth('VEC2', "uvInterp")
shader_info = gpu.types.GPUShaderCreateInfo()
shader_info.push_constant('MAT4', "viewProjectionMatrix")
shader_info.push_constant('MAT4', "modelMatrix")
shader_info.sampler(0, 'FLOAT_2D', "image")
shader_info.vertex_in(0, 'VEC2', "position")
shader_info.vertex_in(1, 'VEC2', "uv")
shader_info.vertex_out(vert_out)
shader_info.fragment_out(0, 'VEC4', "FragColor")
shader_info.vertex_source(
"void main()"
"{"
" uvInterp = uv;"
" gl_Position = viewProjectionMatrix * modelMatrix * vec4(position, 0.0, 1.0);"
"}"
)
shader_info.fragment_source(
"void main()"
"{"
" FragColor = texture(image, uvInterp);"
"}"
)
shader = gpu.shader.create_from_info(shader_info)
del vert_out
del shader_info
batch = batch_for_shader(
shader, 'TRI_FAN',
{
"position": ((-1, -1), (1, -1), (1, 1), (-1, 1)),
"uv": ((0, 0), (1, 0), (1, 1), (0, 1)),
},
)
def draw():
shader.uniform_float("modelMatrix", Matrix.Translation((1, 2, 3)) @ Matrix.Scale(3, 4))
shader.uniform_float("viewProjectionMatrix", bpy.context.region_data.perspective_matrix)
shader.uniform_sampler("image", offscreen.texture_color)
batch.draw(shader)
bpy.types.SpaceView3D.draw_handler_add(draw, (), 'WINDOW', 'POST_VIEW')
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