imgui-odin/examples/impl_sdl2_opengl3.odin

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2025-01-12 18:33:36 -05:00
package impl_sdl2_opengl3
import os "core:os"
import fmt "core:fmt"
import sdl "vendor:sdl2"
import gl "vendor:OpenGL"
import imgui ".."
import imgui_sdl2 "../sdl2"
import imgui_gl3 "../opengl3"
main :: proc() {
run()
}
run :: proc() -> b32 {
if sdl.Init({.VIDEO, .GAMECONTROLLER, .TIMER}) != 0 {
fmt.eprintln(sdl.GetError())
return false
}
glsl_version: cstring = "#version 330"
sdl.GL_SetAttribute(.CONTEXT_FLAGS, 0)
sdl.GL_SetAttribute(.CONTEXT_PROFILE_MASK, i32(sdl.GLprofile.CORE))
sdl.GL_SetAttribute(.CONTEXT_MAJOR_VERSION, 3)
sdl.GL_SetAttribute(.CONTEXT_MINOR_VERSION, 0)
sdl.GL_SetAttribute(.DOUBLEBUFFER, 1)
sdl.GL_SetAttribute(.DEPTH_SIZE, 24)
sdl.GL_SetAttribute(.STENCIL_SIZE, 8)
window_flags: sdl.WindowFlags = {.OPENGL, .RESIZABLE, .HIDDEN, .ALLOW_HIGHDPI}
window := sdl.CreateWindow("Test", sdl.WINDOWPOS_CENTERED, sdl.WINDOWPOS_CENTERED, 1280, 720, window_flags)
if window == nil {
fmt.eprintln(sdl.GetError())
return false
}
gl_ctx := sdl.GL_CreateContext(window)
if gl_ctx == nil {
fmt.eprintln(sdl.GetError())
return false
}
sdl.GL_MakeCurrent(window, gl_ctx)
gl.load_up_to(3, 3, sdl.gl_set_proc_address)
sdl.GL_SetSwapInterval(1)
sdl.ShowWindow(window)
imgui.CreateContext(nil)
io := imgui.GetIO()
io.ConfigFlags |= imgui.ConfigFlags.NavEnableKeyboard
io.ConfigFlags |= imgui.ConfigFlags.NavEnableGamepad
imgui.StyleColorsDark(nil)
imgui_sdl2.InitForOpenGL(window, gl_ctx)
imgui_gl3.InitEx(glsl_version)
clear_color: [4]f32 = {0.45, 0.55, 0.60, 1.00}
_cc := clear_color.xyz
done: b32 = false
show_demo: b8 = true
for !done {
event: sdl.Event
for sdl.PollEvent(&event) {
imgui_sdl2.ProcessEvent(&event)
if event.type == .QUIT do done = true
if event.type == .WINDOWEVENT && event.window.event == .CLOSE do done = true
}
imgui_gl3.NewFrame()
imgui_sdl2.NewFrame()
imgui.NewFrame()
if imgui.Button("Toggle DearImgui Demo") do show_demo = !show_demo
if show_demo do imgui.ShowDemoWindow(&show_demo)
_cc = clear_color.xyz
imgui.ColorEdit3("clear color", &_cc, .None)
imgui.SliderFloat3("clear color", &_cc, 0, 1)
clear_color.xyz = _cc
imgui.Render()
gl.Viewport(0, 0, i32(io.DisplaySize.x), i32(io.DisplaySize.y))
gl.ClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
gl.Clear(gl.COLOR_BUFFER_BIT);
imgui_gl3.RenderDrawData(imgui.GetDrawData());
sdl.GL_SwapWindow(window);
}
imgui_gl3.Shutdown()
imgui_sdl2.Shutdown()
imgui.DestroyContext(nil)
sdl.GL_DeleteContext(gl_ctx)
sdl.DestroyWindow(window)
sdl.Quit()
return true
}