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glfw_opengl3_image_load.nim
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glfw_opengl3_image_load.nim
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import std/[strutils]
import nimgl/[opengl,glfw]
import imgui, imgui/[impl_opengl, impl_glfw]
import stb_image/read as stbi
import ../utils/loadImage
include ../utils/setupFonts
include ./res/resource
include ../utils/simple
const MainWinWidth = 1024
const MainWinHeight = 800
#--------------
# Configration
#--------------
# .--------------------------------------------..---------.-----------------------.------------
# | Combination of flags || | Viewport |
# |--------------------------------------------||---------|-----------------------|------------
# | fViewport | fDocking | TransparentViewport || Docking | Transparent | Outside | Description
# |:---------:|:--------:|:-------------------:||:-------:|:-----------:|:-------:| -----------
# | false | false | false || - | - | - |
# | false | true | false || v | - | - | (Default): Only docking
# | true | - | false || v | - | v | Docking and outside of viewport
# | - | - | true || v | v | - | Transparent Viewport and docking
# `-----------'----------'---------------------'`---------'-------------'---------'-------------
var
fDocking = true
fViewport = false
TransparentViewport = false
#
block:
if TransparentViewport:
fViewport = true
if fViewport:
fDocking = true
#---------------------
# Forward definitions
#---------------------
proc winMain(hWin: glfw.GLFWWindow)
#------
# main
#------
proc main() =
doAssert glfwInit()
defer: glfwTerminate()
if TransparentViewport:
glfwWindowHint(GLFWVisible, GLFW_FALSE)
glfwWindowHint(GLFWContextVersionMajor, 3)
glfwWindowHint(GLFWContextVersionMinor, 3)
glfwWindowHint(GLFWOpenglForwardCompat, GLFW_TRUE)
glfwWindowHint(GLFWOpenglProfile, GLFW_OPENGL_CORE_PROFILE)
glfwWindowHint(GLFWResizable, GLFW_TRUE)
#
var glfwWin = glfwCreateWindow(MainWinWidth, MainWinHeight)
if glfwWin.isNil:
quit(-1)
glfwWin.makeContextCurrent()
defer: glfwWin.destroyWindow()
glfwSwapInterval(1) # Enable vsync
#---------------------
# Load title bar icon
#---------------------
const IconName = "icon.png"
if IconName.fileExists:
var
w, h: int
channels: int
pixels: seq[byte]
pixels = stbi.load(IconName, w, h, channels, stbi.RGBA)
var img = GLFWImage(width: w.int32, height: h.int32
, pixels: cast[ptr cuchar](pixels[0].addr))
glfw.setWindowIcon(glfwWin, 1, img.addr)
else:
glfw.setWindowIcon(glfwWin, 0, nil)
#
doAssert glInit() # OpenGL init
# setup ImGui
let context = igCreateContext(nil)
defer: context.igDestroyContext()
if fDocking:
var pio = igGetIO()
pio.configFlags = cast[ImGuiConfigFlags](pio.configFlags.int or ImGuiConfigFlags.DockingEnable.int)
if fViewport:
pio.configFlags = cast[ImGuiConfigFlags](pio.configFlags.int or ImGuiConfigFlags.ViewportsEnable.int)
pio.configViewportsNoAutomerge = true
# GLFW + OpenGL
const glsl_version = "#version 130" # GL 3.0 + GLSL 130
doAssert igGlfw_InitForOpenGL(glfwwin, true)
defer: igGlfw_Shutdown()
doAssert igOpenGL3_Init(glsl_version)
defer: igOpenGL3_Shutdown()
glfwWin.winMain()
#---------
# winMain
#---------
proc winMain(hWin: glfw.GLFWWindow) =
var
showDemoWindow = true
showAnotherWindow = false
showFirstWindow = true
fval = 0.5f
counter = 0
sBuf = newString(200)
var clearColor:ccolor
if TransparentViewport:
clearColor = ccolor(elm:(x:0f, y:0f, z:0f, w:0.0f)) # Transparent
else:
clearColor = ccolor(elm:(x:0.25f, y:0.65f, z:0.85f, w:1.0f))
igStyleColorsClassic(nil)
# Add multibytes font
var (fExistMultibytesFonts ,sActiveFontName, sActiveFontTitle) = setupFonts()
#-------------
# Load image
#-------------
var
textureId: GLuint
textureWidth = 0
textureHeight = 0
const ImageName = "fuji-400.jpg"
if ImageName.fileExists:
if not loadTextureFromFile(ImageName, textureId, textureWidth,textureHeight):
textureId = 0.GLuint
echo "Error!: Image load error: ", ImageName
else:
echo "Error!: Image file not found error: ", ImageName
var pio = igGetIO()
# main loop
while not hWin.windowShouldClose:
glfwPollEvents()
# start imgui frame
igOpenGL3_NewFrame()
igGlfw_NewFrame()
igNewFrame()
if showDemoWindow:
igShowDemoWindow(addr showDemoWindow)
# show a simple window that we created ourselves.
if showFirstWindow:
igBegin("Nim: Dear ImGui test with Futhark".cstring, addr showFirstWindow)
defer: igEnd()
var s = "GLFW v" & $glfwGetVersionString()
igText(s.cstring)
s = "OpenGL v" & ($cast[cstring](glGetString(GL_VERSION))).split[0]
igText(s.cstring)
igInputTextWithHint("InputText".cstring ,"Input text here".cstring ,sBuf.cstring,sBuf.len.uint)
igCheckbox("Demo window", addr showDemoWindow)
igCheckbox("Another window", addr showAnotherWindow)
igSliderFloat("Float", addr fval, 0.0f, 1.0f, "%.3f")
igColorEdit3("Background color", clearColor.array3)
if igButton("Button", ImVec2(x: 0.0f, y: 0.0f)):
inc counter
igSameLine(0.0f, -1.0f)
igText("counter = %d", counter)
igText("Application average %.3f ms/frame (%.1f FPS)".cstring, (1000.0f / igGetIO().framerate.float).cfloat, igGetIO().framerate)
igSeparatorText(ICON_FA_WRENCH & " Icon font test ")
igText(ICON_FA_TRASH_CAN & " Trash")
igText(ICON_FA_MAGNIFYING_GLASS_PLUS &
" " & ICON_FA_POWER_OFF &
" " & ICON_FA_MICROPHONE &
" " & ICON_FA_MICROCHIP &
" " & ICON_FA_VOLUME_HIGH &
" " & ICON_FA_SCISSORS &
" " & ICON_FA_SCREWDRIVER_WRENCH &
" " & ICON_FA_BLOG)
# show further samll window
if showAnotherWindow:
igBegin("imgui Another Window", addr showAnotherWindow)
igText("Hello from imgui")
if igButton("Close me", ImVec2(x: 0.0f, y: 0.0f)):
showAnotherWindow = false
igEnd()
# Show image load window
if igBegin("Image load test".cstring):
defer: igEnd()
# Load image
let
size = ImVec2(x: textureWidth.cfloat, y: textureHeight.cfloat)
uv0 = Imvec2(x: 0, y: 0)
uv1 = Imvec2(x: 1, y: 1)
tint_col = ImVec4(x: 1, y: 1, z: 1, w: 1)
border_col = ImVec4(x: 0, y: 0, z: 0, w: 0)
igSetNextWindowSize(size,Always.ImGuiCond)
igImage(cast[pointer](textureId), size, uv0, uv1, tint_col, border_col);
# render
igRender()
glClearColor(clearColor.elm.x, clearColor.elm.y, clearColor.elm.z, clearColor.elm.w)
glClear(GL_COLOR_BUFFER_BIT)
igOpenGL3_RenderDrawData(igGetDrawData())
if 0 != (pio.configFlags.int and ImGuiConfigFlags.ViewportsEnable.int):
var backup_current_window = glfwGetCurrentContext()
igUpdatePlatformWindows()
igRenderPlatformWindowsDefault(nil, nil)
backup_current_window.makeContextCurrent()
hWin.swapBuffers()
if not showFirstWindow and not showDemoWindow and not showAnotherWindow:
hwin.setWindowShouldClose(true) # End program
#------
# main
#------
main()