It's probably not possible, but I'll post anyway incase any of you clever boffins have any ideas.
Basically I'm NOT using the BMax Viewport command because it fails on some videocards (as in, it does nothing) - I've seen it with my own eyes.
I'm using this very useful code by Ian Duff:
This works great and I can pass in parameters to basically draw a clipped rectangle to my view port, like this:
Probably the above function can be optimised, please let me know if you can think of a smarter way to do it.
Anyway ... If I use SetRotation and call the above code, the image is drawn rotated fine but of course it's clipped BEFORE the rotation and thus weird stuff happens to it like bits appear missing inside the viewport and other bits poke out the viewport :-(
I want to rotate it and then draw it clipped AFTER the rotation so that the clipping rectangle is at Rotation 0, not the same angle as the rotated image. Make sense? If not I'll post an image.
Oh and it has to be fast enough to use at runtime, not precalculated (e.g. using pixmaps etc).
Anyone got any ideas how to resolve this as I'm stuck because my DX/GL knowledge is minimal. Many thanks in advance.
Basically I'm NOT using the BMax Viewport command because it fails on some videocards (as in, it does nothing) - I've seen it with my own eyes.
I'm using this very useful code by Ian Duff:
' ----------------------------------------------------------------------------- ' ccDrawImageArea: Draws part of an image. ' (by Ian Duff) ' ----------------------------------------------------------------------------- Function ccDrawImageArea(image:TImage, x#, y#, rx#, ry#, rw#, rh#, theframe=0) 'Note that this code works fine in DirectX or OpenGL on PCs - it autodetects (Grey Alien). Local origin_x#, origin_y# ; GetOrigin (origin_x, origin_y) Local tw = ccDrawImageAreaPow2Size(image.width) Local th = ccDrawImageAreaPow2Size(image.height) Local rw1# = rx + rw Local rh1# = ry + rh Local x0# = -image.handle_x, x1# = x0 + rw Local y0# = -image.handle_y, y1# = y0 + rh If rw1 > image.width x1 = x0 + rw + image.width - rw1 rw1 = image.width EndIf If rh1 > image.height y1 = y0 + rh + image.height - rh1 rh1 = image.height EndIf ?Win32 If TD3D7ImageFrame(image.frame(theframe)) Local frame:TD3D7ImageFrame = TD3D7ImageFrame(image.frame(theframe)) frame.setUV(rx / tw, ry / th, rw1 / tw, rh1 / th) frame.Draw x0, y0, x1, y1, x + origin_x, y + origin_y frame.setUV(0, 0, image.width / Float(tw), image.height / Float(th)) Else ? Local frameA:TGLImageFrame = TGLImageFrame (image.frame(theframe)) frameA.u0 = rx / tw frameA.v0 = ry / th frameA.u1 = rw1 / tw frameA.v1 = rh1 / th frameA.Draw x0, y0, x1, y1, x + origin_x, y + origin_y frameA.u0 = 0 frameA.v0 = 0 frameA.u1 = image.width / Float(tw) frameA.v1 = image.height / Float(th) ?Win32 EndIf ? Function ccDrawImageAreaPow2Size%(n) Local ry = 1 While ry < n ry :* 2 Wend Return ry End Function End Function
This works great and I can pass in parameters to basically draw a clipped rectangle to my view port, like this:
' ----------------------------------------------------------------------------- ' ccClipImageToViewport: Clips an image into a "safe" viewport (doesn't use BMax viewport) ' ----------------------------------------------------------------------------- Function ccClipImageToViewport(image:TImage, imagex#, imagey#, ViewportX#, ViewPortY#, ViewPortW#, ViewPortH#, offsetx=0, offsety=0) 'Perform basic clipping first by checking to see if the image is completely 'outside of the viewport. 'Note that images are drawn from the top left, not midhandled or anything else. Local w = ImageWidth(image) Local h = ImageHeight(image) If imagex+w>=ViewportX And imagex-w<ViewportX+ViewportW and.. imagey+h>=ViewportY And imagey-h<ViewportY+ViewportH Then 'Clip left and top Local startx#=ViewportX-imagex Local starty#=ViewportY-imagey If startx<0 Then startx=0 'clamp normal values If starty<0 Then starty=0 'clamp normal values 'Clip right and bottom Local endx#=(imagex+w)-(ViewportX+ViewportW) Local endy#=(imagey+h)-(ViewportY+ViewportH) If endx<0 Then endx=0 'clamp normal values If endy<0 Then endy=0 'clamp normal values ccDrawImageArea(Image, imageX+startX+offsetx, imagey+starty+offsety, startx, starty, w-startx-endx, h-starty-endy) EndIf End Function
Probably the above function can be optimised, please let me know if you can think of a smarter way to do it.
Anyway ... If I use SetRotation and call the above code, the image is drawn rotated fine but of course it's clipped BEFORE the rotation and thus weird stuff happens to it like bits appear missing inside the viewport and other bits poke out the viewport :-(
I want to rotate it and then draw it clipped AFTER the rotation so that the clipping rectangle is at Rotation 0, not the same angle as the rotated image. Make sense? If not I'll post an image.
Oh and it has to be fast enough to use at runtime, not precalculated (e.g. using pixmaps etc).
Anyone got any ideas how to resolve this as I'm stuck because my DX/GL knowledge is minimal. Many thanks in advance.