buffer screenshot working + update gitignore for screenshot/.png

.gitignore

@@ -1,3 +1,4 @@
 /resources_compiled
 /_bin
 /assetc-ubuntu-x64-2.3.0
+screenshots/.png

scene_screenshot_buffer.lua

@@ -7,26 +7,28 @@ hg.InputInit()
 hg.WindowSystemInit()
 
 res_x, res_y = 1024, 1024
-win = hg.RenderInit('Screenshot Buffer', res_x, res_y, hg.RF_VSync | hg.RF_MSAA4X)
+win = hg.RenderInit('Frame Buffer Screenshot', res_x, res_y, hg.RF_VSync | hg.RF_MSAA4X)
 
-hg.AddAssetsFolder("resources_compiled")
 
 pipeline = hg.CreateForwardPipeline()
 local res = hg.PipelineResources()
 
-scene = hg.Scene()
-hg.LoadSceneFromAssets("car_engine/engine.scn", scene, res, hg.GetForwardPipelineInfo())
+hg.AddAssetsFolder("resources_compiled")
 
 local tex_size = 1024
-local picture = hg.Picture(tex_size, tex_size, hg.PF_RGBA32F)
+local picture = hg.Picture(tex_size, tex_size, hg.PF_RGBA32)
 local frame_buffer = hg.CreateFrameBuffer(tex_size, tex_size, hg.TF_RGBA8, hg.TF_D24, 4, 'framebuffer')
 local tex_color = hg.GetColorTexture(frame_buffer)
 local tex_color_ref = res:AddTexture("tex_rb", tex_color)
 local tex_readback = hg.CreateTexture(tex_size, tex_size, "readback", hg.TF_ReadBack | hg.TF_BlitDestination, hg.TF_RGBA8)
 
+scene = hg.Scene()
+ret = hg.LoadSceneFromAssets("car_engine/engine.scn", scene, res, hg.GetForwardPipelineInfo())
+
+assert(ret)
+
 local state = "none"
 
--- main loop
 local frame = 0
 local view_id = 0
 
@@ -57,16 +59,16 @@ while not hg.ReadKeyboard():Key(hg.K_Escape) and hg.IsWindowOpen(win) do
 
 	scene:Update(dt)
 
-	view_id = 0
+    view_id = 0
 	view_id = hg.SubmitSceneToPipeline(view_id, scene, hg.IntRect(0, 0, res_x, res_y), true, pipeline, res, frame_buffer.handle)
-	--view_id = hg.SubmitSceneToPipeline(view_id, scene, hg.IntRect(0, 0, res_x, res_y), true, pipeline, res)
 
-	-- hg.SetViewPerspective(view_id, 0, 0, res_x, res_y, hg.TranslationMat4(hg.Vec3(0, 0, -1.8)))
+	hg.SetViewPerspective(view_id, 0, 0, res_x, res_y, hg.TranslationMat4(hg.Vec3(0, 0, -1.8)))
+
+	val_uniforms = {hg.MakeUniformSetValue('color', hg.Vec4(1, 1, 1, 1))} 
+	tex_uniforms = {hg.MakeUniformSetTexture('s_tex', tex_color, 0)}
 
-	-- val_uniforms = {hg.MakeUniformSetValue('color', hg.Vec4(1, 1, 1, 1))} 
-	-- tex_uniforms = {hg.MakeUniformSetTexture('s_tex', tex_color, 0)}
+	hg.DrawModel(view_id, plane_mdl, plane_prg, val_uniforms, tex_uniforms, hg.TransformationMat4(hg.Vec3(0, 0, 0), hg.Vec3(-math.pi/2,0, 0)))
 
-	-- hg.DrawModel(view_id, plane_mdl, plane_prg, val_uniforms, tex_uniforms, hg.TransformationMat4(hg.Vec3(0, 0, 0), hg.Vec3(-math.pi/2,0, 0)))
 	frame = hg.Frame()
 	hg.UpdateWindow(win)
 end