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Adapt Renderer.jl to new API #67

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Dec 3, 2021
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Adapt Renderer.jl to new API #67

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41 changes: 23 additions & 18 deletions examples/Renderer.jl
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Original file line number Diff line number Diff line change
@@ -1,10 +1,10 @@
module Renderer

using CImGui
using CImGui.GLFWBackend
using CImGui.OpenGLBackend
using CImGui.GLFWBackend.GLFW
using CImGui.OpenGLBackend.ModernGL
using CImGui.ImGuiGLFWBackend
using CImGui.ImGuiOpenGLBackend
using CImGui.ImGuiGLFWBackend.LibGLFW
using CImGui.ImGuiOpenGLBackend.ModernGL

function __init__()
@static if Sys.isapple()
Expand Down Expand Up @@ -45,29 +45,34 @@ function init_renderer(width, height, title::AbstractString)
# CImGui.StyleColorsLight()

# setup Platform/Renderer bindings
ImGui_ImplGlfw_InitForOpenGL(window, true)
ImGui_ImplOpenGL3_Init(glsl_version)
glfw_ctx = ImGuiGLFWBackend.create_context(window, install_callbacks = true)
ImGuiGLFWBackend.init(glfw_ctx)
opengl_ctx = ImGuiOpenGLBackend.create_context(glsl_version)
ImGuiOpenGLBackend.init(opengl_ctx)

return window, ctx
return window, ctx, glfw_ctx, opengl_ctx
end

function renderloop(window, ctx, ui=()->nothing, hotloading=false)
function renderloop(window, ctx, glfw_ctx, opengl_ctx, ui=()->nothing, hotloading=false)
try
while !glfwWindowShouldClose(window)
while glfwWindowShouldClose(window) == 0
glfwPollEvents()
ImGui_ImplOpenGL3_NewFrame()
ImGui_ImplGlfw_NewFrame()
ImGuiOpenGLBackend.new_frame(opengl_ctx)
ImGuiGLFWBackend.new_frame(glfw_ctx)
CImGui.NewFrame()

hotloading ? Base.invokelatest(ui) : ui()

CImGui.Render()
glfwMakeContextCurrent(window)
display_w, display_h = glfwGetFramebufferSize(window)
width, height = Ref{Cint}(), Ref{Cint}() #! need helper fcn
glfwGetFramebufferSize(window, width, height)
display_w = width[]
display_h = height[]
glViewport(0, 0, display_w, display_h)
glClearColor(0.2, 0.2, 0.2, 1)
glClear(GL_COLOR_BUFFER_BIT)
ImGui_ImplOpenGL3_RenderDrawData(CImGui.GetDrawData())
ImGuiOpenGLBackend.render(opengl_ctx)

glfwMakeContextCurrent(window)
glfwSwapBuffers(window)
Expand All @@ -77,19 +82,19 @@ function renderloop(window, ctx, ui=()->nothing, hotloading=false)
@error "Error in renderloop!" exception=e
Base.show_backtrace(stderr, catch_backtrace())
finally
ImGui_ImplOpenGL3_Shutdown()
ImGui_ImplGlfw_Shutdown()
ImGuiOpenGLBackend.shutdown(opengl_ctx)
ImGuiGLFWBackend.shutdown(glfw_ctx)
CImGui.DestroyContext(ctx)
glfwDestroyWindow(window)
end
end

function render(ui; width=1280, height=720, title::AbstractString="Demo", hotloading=false)
window, ctx = init_renderer(width, height, title)
window, ctx, glfw_ctx, opengl_ctx = init_renderer(width, height, title)
GC.@preserve window ctx begin
t = @async renderloop(window, ctx, ui, hotloading)
t = @async renderloop(window, ctx, glfw_ctx, opengl_ctx, ui, hotloading)
end
return t
end

end # module
end # module