Full screen shader issue (createRenderImage and renderToImage)

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lilpissywilly

AGK Developer

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Joined: 10th Sep 2010

Location: Office Chair

Posted: 8th Jul 2014 13:19 Edited at: 8th Jul 2014 13:23

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I've run into a problem when trying out some full screen shaders.

The thing is, when I'm using a landscape resolution it works fine.
For example:

+ Code Snippet

setVirtualResolution(1280,720)

fullScreenShaderImg = createRenderImage(1280,720, 0, 0 )
fullScreenShaderSpr = createSprite(fullScreenShaderImg)
pic = loadSprite("WIN_20140607_142036.jpg")

do



    update(0)

    setRenderToImage(fullScreenShaderImg, 0)
    clearScreen()
    render()

    setRenderToScreen()
 
    drawSprite(fullScreenShaderSpr)

    swap()


loop

Above example works as expected, great.

If I however turn the screen into a portrait, 720x1280 in this case. And do the same when creating the render image, it doesn't work right. I'll show it with a screen grab:

+ Code Snippet

setVirtualResolution(720,1280)

fullScreenShaderImg = createRenderImage(720,1280, 0, 0 )
fullScreenShaderSpr = createSprite(fullScreenShaderImg)
pic = loadSprite("image.png")

do



    update(0)

    setRenderToImage(fullScreenShaderImg, 0)
    clearScreen()
    render()

    setRenderToScreen()

    drawSprite(fullScreenShaderSpr)

    swap()



loop

Edit: Yeah, fudged up a bit on that image, the top of the landscape view is cut off, but that one works right.

My hovercraft is full of eels

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Paul Johnston

TGC Developer

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Joined: 16th Nov 2002

Location: United Kingdom

Posted: 10th Jul 2014 15:52

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It seems there is an issue with SetRenderToImage if SetScissor is not set to 0,0,0,0, but I'm not sure how it could be fixed. If you set that does it behave?

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lilpissywilly

AGK Developer

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Posted: 10th Jul 2014 17:09 Edited at: 10th Jul 2014 17:47

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That appears to work. However there is something with SetSpriteScissor that seems to not work on the ImageRender. I have an energy bar that gets clipped from the top when the energy drops and instead it goes from the bottom up, but it also clips the sprite horizontally partially.

Edit: On another note, I'm trying to rotate the quad and that doesn't appear to work either. It works with having a sprite showing the render image. Is that a limitation of drawObject perhaps?

My hovercraft is full of eels

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baxslash

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Posted: 10th Jul 2014 17:23

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Paul, I have problems with render to image in 3D too. Z depth gets really messed up on primitives... If you create a bunch of textured planes you'll find they are showing through each other in most circumstances. Same with boxes.

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Paul Johnston

TGC Developer

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Location: United Kingdom

Posted: 10th Jul 2014 17:58

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Quote: "there is something with SetSpriteScissor that seems to not work on the ImageRender"

This would affect all scissor commands since the scissor coordinates are set for the original display but the render image has different dimensions, so I'll have to find a way to translate the coordinates without affecting the final render.

Quote: "I'm trying to rotate the quad and that doesn't appear to work either"

Quads can't be rotated, they are optimized to fill the entire screen.

Quote: "I have problems with render to image in 3D too. Z depth gets really messed up on primitives"

Do you have an example I can take a look at?

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lilpissywilly

AGK Developer

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Posted: 10th Jul 2014 18:50

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Thanks Paul for the swift answers.

I'll just use a workaround to the setSpriteScissor if I want to use renderToImage for now.

My hovercraft is full of eels

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baxslash

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Posted: 13th Jul 2014 22:56

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Quote: "Do you have an example I can take a look at?"

I'll re-send the email I sent previously.

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lilpissywilly

AGK Developer

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Posted: 16th Jul 2014 17:45 Edited at: 16th Jul 2014 19:13

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Got a bit of a new issue now that I've started testing on a phone.

It seems like the image that is rendered is cropped on all sides on the phone while it's perfect on PC.

I'm projecting the image onto a plane and setting the size of the plane and the camera position as to perfectly fit the screen, it works very well on PC.

The reason for the plane is I'm rotating it.

Moving the camera to show more did not work on android, it's still cropped.

My hovercraft is full of eels

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AppGameKit Classic Chat / Full screen shader issue (createRenderImage and renderToImage)

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