Render To Image ? must it be the entire screen ?

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haliop_New

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Posted: 6th Oct 2015 09:50

could I use RenderToImage like GetImage(sx,sy,ex,ey) ?

what if I want just a portion of the screen ? isn't that possible ?

so RenderToImage(render_image,startX#.startY#.endX#,endY#,depth)

?
I bet it is faster then Getimage...

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BatVink

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Joined: 4th Apr 2003

Location: Gods own County, UK

Posted: 6th Oct 2015 15:39

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RenderToImage() doesn't really work like that.
You can make the Render Image any size (to ^2, e.g 256x256, 1024x1024)

Once you set renderToImage(), everything you do goes to the image instead of the screen. So you are not doing a GetImage() [a copy], but you are creating an original image that doesn't exist anywhere else.

What you must remember is that the coordinates you use on the Render Image are still the same as the virtual dimensions of the screen. So
if your screen is 19080x1080 and
your Render Image is 512x512
to put something in the middle of the Render image (256,256) you must place it at 960,540

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JSR $FFD2

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Joined: 16th May 2015

Location: Sweden

Posted: 2nd Jan 2016 15:51

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Help me with "RenderToImage", do not understand how it works !?
See my faltering attempts!

first method works: here I set the "Virtual Resolution" to the size of the newly created "image"
- I use DrawBox, DrawLine or whatever..............
- Then i setting back the "Virtual resolution" to the original size

+ Code Snippet

function create_SpriteImage()
	local imgID as integer, color as integer
	local virtSizeX as integer, virtSizeY as integer
	
	virtSizeX = GetVirtualWidth() : virtSizeY = GetVirtualHeight()
	
	color = MakeColor(255,0,0) 
	imgID = CreateRenderImage(16, 16, 0, 0)
	SetVirtualResolution(16,16)
	SetRenderToImage(imgID, 0)
	DrawBox(0, 0, 15, 15, 0x00ff00,0x00ff00,0x00ff00,0x00ff00,0)
	drawline(0, 0, 15, 15,0x0000ff, 0x0000ff)
	drawline(0, 15, 15, 0,0x0000ff, 0x0000ff)
	SetRenderToScreen()
	SetVirtualResolution(virtSizeX, virtSizeY)
	SetClearColor(0,0,0)	
endfunction imgID

second methods works: I use "SetClearColor" and "Clear Screen", I do not change the resolution.

+ Code Snippet

function create_Sprite_1()
	local imgID as integer, color as integer
	local sprID as integer
	
	color = MakeColor(255,0,0) 
	imgID = CreateRenderImage(16, 16, 0, 0)
	SetClearColor(255, 0, 0)
	SetRenderToImage(imgID, 0)	
	ClearScreen()
	SetRenderToScreen()
	SetClearColor(0,0,0)
	sprID = CreateSprite(imgID)
			
endfunction sprID

third method does not work: why not ?? I have tried all possible and impossible coordinates!

+ Code Snippet

function create_Sprite_2()
	local imgID as integer, color as integer
	local sprID as integer
		
	color = MakeColor(0, 255, 0) 
	imgID = CreateRenderImage(16, 16, 0, 0)
	
	SetRenderToImage(imgID, 0)
	DrawBox(512-8, 384-8, 512+8, 384+8, color, color, color, color,1) // what ?? dosen't work !?
	DrawBox(0,0,15,15, color, color, color, color, 1) // what ?? dosen't work !?
	SetRenderToScreen()	
	sprID = CreateSprite(imgID)	
	
endfunction sprID

I would be very happy if someone has the time to show a working example,
preferably correcting my third example!

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