Loading SVGs as viewport/texture #367

keriefie · 2023-12-17T01:43:02Z

Not sure if this is the best place to post this but I have been trying for the past hours to load SVG data (xml string) and render it in a viewport in PyImGui, but have not managed to do anything. I found an old thing with pyglet, and tried to use it to load it via a (manually updated) svgbatch. However it did not end up working, or I don't understand how to load the textures properly in PyImGui/OpenGL. Either way it seems like a silly way to do it, requiring svgbatch > pyglet > imgui, which is more libraries than I would like to use.

Is there some way to either directly load SVG shapes (or even just primitives) into PyImGui or some more efficient way to render it to an OpenGL texture?

svgtexture.py

import util.gsvgbatch as gsb
import pyglet
from pyglet.gl import *
from ctypes import byref


class SvgTexture:
    def __init__(self, string):
        self.batch = gsb.svg2batch(string)
        self.w = 800
        self.h = 800
        self.image = pyglet.image.create(self.w, self.h)
        self.texture = self.image.get_texture()
        self.fbo_id = GLuint(0)

        glGenFramebuffers(1, byref(self.fbo_id))
        glBindFramebuffer(GL_FRAMEBUFFER, self.fbo_id)

        glBindTexture(GL_TEXTURE_2D, self.texture.id)

        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self.texture.id, 0)

        self.batch.draw()

    def render(self):
        glBindFramebuffer(GL_FRAMEBUFFER, 0)
        self.texture.blit(0, 0)

main loop

            if show_viewport_area:
                window_flags = (imgui.WINDOW_NO_RESIZE |
                                imgui.WINDOW_NO_MOVE |
                                imgui.WINDOW_NO_COLLAPSE |
                                imgui.WINDOW_NO_TITLE_BAR |
                                imgui.WINDOW_NO_BRING_TO_FRONT_ON_FOCUS)

                is_expand, show_glyph_area = (
                    imgui.begin("Viewport", False, flags=window_flags))
                if is_expand:
                    texture = svgtexture.SvgTexture(self.svg)
                    texture.render()
                    imgui.image(0, 80, 80)
                    # imgui.text("[image viewport goes here]")
                imgui.end()

learn-more · 2024-02-13T13:34:03Z

There is no builtin support for svg files in pyimgui.

keriefie · 2024-02-16T14:17:00Z

There is no builtin support for svg files in pyimgui.

I was just curious if there were any tessellation libraries that work well with pyimgui. But if not I can do it myself.

learn-more added the question / hint label Feb 13, 2024

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Loading SVGs as viewport/texture #367

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Loading SVGs as viewport/texture #367

Loading SVGs as viewport/texture #367

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