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import ctypes
import imgui
import moderngl
from imgui.integrations import compute_fb_scale
from imgui.integrations.base import BaseOpenGLRenderer
class ModernglWindowMixin:
def resize(self, width: int, height: int):
self.io.display_size = self.wnd.size
self.io.display_fb_scale = compute_fb_scale(self.wnd.size, self.wnd.buffer_size)
def key_event(self, key, action, modifiers):
keys = self.wnd.keys
if action == keys.ACTION_PRESS:
if key in self.REVERSE_KEY_MAP:
self.io.keys_down[self.REVERSE_KEY_MAP[key]] = True
else:
if key in self.REVERSE_KEY_MAP:
self.io.keys_down[self.REVERSE_KEY_MAP[key]] = False
def _mouse_pos_viewport(self, x, y):
"""Make sure mouse coordinates are correct with black borders"""
return (
int(
x
- (self.wnd.width - self.wnd.viewport_width / self.wnd.pixel_ratio) / 2
),
int(
y
- (self.wnd.height - self.wnd.viewport_height / self.wnd.pixel_ratio)
/ 2
),
)
def mouse_position_event(self, x, y, dx, dy):
self.io.mouse_pos = self._mouse_pos_viewport(x, y)
def mouse_drag_event(self, x, y, dx, dy):
self.io.mouse_pos = self._mouse_pos_viewport(x, y)
if self.wnd.mouse_states.left:
self.io.mouse_down[0] = 1
if self.wnd.mouse_states.middle:
self.io.mouse_down[2] = 1
if self.wnd.mouse_states.right:
self.io.mouse_down[1] = 1
def mouse_scroll_event(self, x_offset, y_offset):
self.io.mouse_wheel = y_offset
def mouse_press_event(self, x, y, button):
self.io.mouse_pos = self._mouse_pos_viewport(x, y)
if button == self.wnd.mouse.left:
self.io.mouse_down[0] = 1
if button == self.wnd.mouse.middle:
self.io.mouse_down[2] = 1
if button == self.wnd.mouse.right:
self.io.mouse_down[1] = 1
def mouse_release_event(self, x: int, y: int, button: int):
self.io.mouse_pos = self._mouse_pos_viewport(x, y)
if button == self.wnd.mouse.left:
self.io.mouse_down[0] = 0
if button == self.wnd.mouse.middle:
self.io.mouse_down[2] = 0
if button == self.wnd.mouse.right:
self.io.mouse_down[1] = 0
def unicode_char_entered(self, char):
io = imgui.get_io()
io.add_input_character(ord(char))
class ModernGLRenderer(BaseOpenGLRenderer):
VERTEX_SHADER_SRC = """
#version 330
uniform mat4 ProjMtx;
in vec2 Position;
in vec2 UV;
in vec4 Color;
out vec2 Frag_UV;
out vec4 Frag_Color;
void main() {
Frag_UV = UV;
Frag_Color = Color;
gl_Position = ProjMtx * vec4(Position.xy, 0, 1);
}
"""
FRAGMENT_SHADER_SRC = """
#version 330
uniform sampler2D Texture;
in vec2 Frag_UV;
in vec4 Frag_Color;
out vec4 Out_Color;
void main() {
Out_Color = (Frag_Color * texture(Texture, Frag_UV.st));
}
"""
def __init__(self, *args, **kwargs):
self._prog = None
self._fbo = None
self._font_texture = None
self._vertex_buffer = None
self._index_buffer = None
self._vao = None
self._textures = {}
self.wnd = kwargs.get("wnd")
self.ctx = self.wnd.ctx if self.wnd and self.wnd.ctx else kwargs.get("ctx")
if not self.ctx:
raise ValueError("Missing moderngl context")
assert isinstance(self.ctx, moderngl.Context)
super().__init__()
if hasattr(self, "wnd") and self.wnd:
self.resize(*self.wnd.buffer_size)
elif "display_size" in kwargs:
self.io.display_size = kwargs.get("display_size")
def register_texture(self, texture: moderngl.Texture):
"""Make the imgui renderer aware of the texture"""
self._textures[texture.glo] = texture
def remove_texture(self, texture: moderngl.Texture):
"""Remove the texture from the imgui renderer"""
del self._textures[texture.glo]
def refresh_font_texture(self):
width, height, pixels = self.io.fonts.get_tex_data_as_rgba32()
if self._font_texture:
self.remove_texture(self._font_texture)
self._font_texture.release()
self._font_texture = self.ctx.texture((width, height), 4, data=pixels)
self.register_texture(self._font_texture)
self.io.fonts.texture_id = self._font_texture.glo
self.io.fonts.clear_tex_data()
def _create_device_objects(self):
self._prog = self.ctx.program(
vertex_shader=self.VERTEX_SHADER_SRC,
fragment_shader=self.FRAGMENT_SHADER_SRC,
)
self.projMat = self._prog["ProjMtx"]
self._prog["Texture"].value = 0
self._vertex_buffer = self.ctx.buffer(reserve=imgui.VERTEX_SIZE * 65536)
self._index_buffer = self.ctx.buffer(reserve=imgui.INDEX_SIZE * 65536)
self._vao = self.ctx.vertex_array(
self._prog,
[(self._vertex_buffer, "2f 2f 4f1", "Position", "UV", "Color")],
index_buffer=self._index_buffer,
index_element_size=imgui.INDEX_SIZE,
)
def render(self, draw_data):
io = self.io
display_width, display_height = io.display_size
fb_width = int(display_width * io.display_fb_scale[0])
fb_height = int(display_height * io.display_fb_scale[1])
if fb_width == 0 or fb_height == 0:
return
self.projMat.value = (
2.0 / display_width,
0.0,
0.0,
0.0,
0.0,
2.0 / -display_height,
0.0,
0.0,
0.0,
0.0,
-1.0,
0.0,
-1.0,
1.0,
0.0,
1.0,
)
draw_data.scale_clip_rects(*io.display_fb_scale)
self.ctx.enable_only(moderngl.BLEND)
self.ctx.blend_equation = moderngl.FUNC_ADD
self.ctx.blend_func = moderngl.SRC_ALPHA, moderngl.ONE_MINUS_SRC_ALPHA
self._font_texture.use()
for commands in draw_data.commands_lists:
# Write the vertex and index buffer data without copying it
vtx_type = ctypes.c_byte * commands.vtx_buffer_size * imgui.VERTEX_SIZE
idx_type = ctypes.c_byte * commands.idx_buffer_size * imgui.INDEX_SIZE
vtx_arr = (vtx_type).from_address(commands.vtx_buffer_data)
idx_arr = (idx_type).from_address(commands.idx_buffer_data)
self._vertex_buffer.write(vtx_arr)
self._index_buffer.write(idx_arr)
idx_pos = 0
for command in commands.commands:
texture = self._textures.get(command.texture_id)
if texture is None:
raise ValueError(
(
"Texture {} is not registered. Please add to renderer using "
"register_texture(..). "
"Current textures: {}".format(
command.texture_id, list(self._textures)
)
)
)
texture.use(0)
x, y, z, w = command.clip_rect
self.ctx.scissor = int(x), int(fb_height - w), int(z - x), int(w - y)
self._vao.render(
moderngl.TRIANGLES, vertices=command.elem_count, first=idx_pos
)
idx_pos += command.elem_count
self.ctx.scissor = None
def _invalidate_device_objects(self):
if self._font_texture:
self._font_texture.release()
if self._vertex_buffer:
self._vertex_buffer.release()
if self._index_buffer:
self._index_buffer.release()
if self._vao:
self._vao.release()
if self._prog:
self._prog.release()
self.io.fonts.texture_id = 0
self._font_texture = None
class ModernglWindowRenderer(ModernGLRenderer, ModernglWindowMixin):
def __init__(self, window):
super().__init__(wnd=window)
self.wnd = window
self._init_key_maps()
self.io.display_size = self.wnd.size
self.io.display_fb_scale = self.wnd.pixel_ratio, self.wnd.pixel_ratio
def _init_key_maps(self):
keys = self.wnd.keys
self.REVERSE_KEY_MAP = {
keys.TAB: imgui.KEY_TAB,
keys.LEFT: imgui.KEY_LEFT_ARROW,
keys.RIGHT: imgui.KEY_RIGHT_ARROW,
keys.UP: imgui.KEY_UP_ARROW,
keys.DOWN: imgui.KEY_DOWN_ARROW,
keys.PAGE_UP: imgui.KEY_PAGE_UP,
keys.PAGE_DOWN: imgui.KEY_PAGE_DOWN,
keys.HOME: imgui.KEY_HOME,
keys.END: imgui.KEY_END,
keys.DELETE: imgui.KEY_DELETE,
keys.SPACE: imgui.KEY_SPACE,
keys.BACKSPACE: imgui.KEY_BACKSPACE,
keys.ENTER: imgui.KEY_ENTER,
keys.ESCAPE: imgui.KEY_ESCAPE,
keys.A: imgui.KEY_A,
keys.C: imgui.KEY_C,
keys.V: imgui.KEY_V,
keys.X: imgui.KEY_X,
keys.Y: imgui.KEY_Y,
keys.Z: imgui.KEY_Z,
}
for value in self.REVERSE_KEY_MAP.values():
self.io.key_map[value] = value
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