koobas.hobune.stream
How to draw texture on top of everything?
Hello,
I found this really nice shader for drawing screen transitions/wipes behind the UI. What I want to do is draw it on top of everything- even the UI. I tried WaitForEndOfFrame() but that hides the UI because it's getting the current render texture in OnRenderImage()- before the UI is drawn.
So my question is: how do you grab the render texture of the camera after the UI and everything has been drawn, send that to the shader for lerping in an alpha transition, then Gaphics.blit it to the current RT?
This is my current attempt:
void OnGUI()
{
StartCoroutine(RenderOnTop());
}
IEnumerator RenderOnTop()
{
while(true)
{
RenderTexture currentRT = RenderTexture.active;
RenderTexture.active = cam.targetTexture;
cam.Render();
material.SetColor("_MaskColor", maskColor);
material.SetFloat("_MaskValue", maskValue);
material.SetFloat("_MaskSpread", maskSpread);
material.SetTexture("_MainTex", currentRT);
material.SetTexture("_MaskTex", maskTexture);
yield return new WaitForEndOfFrame();
Graphics.Blit(currentRT, null, material);
}
}
Thanks
P.S. Would UI masks be a more efficient solution?
I chanced upon a script that saves out a render texture from the main camera, but it renders black for the duration of the transition. Here is my current attempt at grabbing the camera render texture, running the transition, blitting it back then discarding that texture.
private IEnumerator RenderTex()
{
while(transitioning)
{
//Wait for graphics to render
yield return new WaitForEndOfFrame();
//create a render texture
RenderTexture rt = new RenderTexture(Screen.width, Screen.height, 24);
//rendertexture
Camera.main.targetTexture = rt;
Camera.main.Render();
//assign the rendered texture to rt
RenderTexture.active = rt;
//pass this rt to the shader
material.SetColor("_$$anonymous$$askColor", maskColor);
material.SetFloat("_$$anonymous$$askValue", maskValue);
material.SetFloat("_$$anonymous$$askSpread", maskSpread);
material.SetTexture("_$$anonymous$$ainTex", rt);
material.SetTexture("_$$anonymous$$askTex", maskTexture);
//render the modified source render texture to screen
Graphics.Blit(rt, null, material);
//reset these to null
Camera.main.targetTexture = null;
RenderTexture.active = null; //Added to avoid errors
//destroy texture
Destroy(rt);
yield return null;
}
}
//fades
IEnumerator Fade(bool fadeIn)
{
//set this bool to true before calling the coroutine
transitioning = true;
//modify render texture in this coroutine
StartCoroutine(RenderTex());
//create local time var
float t = 0;
if(fadeIn == false)
{
t = 0;
//play fade out sfx
if(sfx) sfx.UI("fadeOut");
//while transitioning, add time and assign t to mask value
while(t < 1.5f)
{
t += Time.deltaTime * Level$$anonymous$$anager.Instance.cameraOptions.fadeSpeed;
maskValue = t;
yield return null;
}
}
//fade out
else
{
t = 1.5f;
//play fade out sfx
if(sfx) sfx.UI("fadeIn");
//while transitioning, subtract time and assign t to mask value
while(t > 0)
{
t -= Time.deltaTime * Level$$anonymous$$anager.Instance.cameraOptions.fadeSpeed;
maskValue = t;
yield return null;
}
}
//set this bool back to false to stop coroutine while loop
transitioning = false;
yield return null;
}
