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merged rain shader stuff from 'feature/week2-erect-bg-rain'

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FabsTheFabs 2024-07-18 06:04:19 +01:00
parent 4bcfbc957f
commit a0ab216617
2 changed files with 39 additions and 0 deletions
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31
source/funkin/graphics/shaders/RuntimePostEffectShader.hx
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@ -2,6 +2,7 @@ package funkin.graphics.shaders;
import flixel.FlxCamera;
import flixel.FlxG;
import flixel.graphics.frames.FlxFrame;
import flixel.addons.display.FlxRuntimeShader;
import lime.graphics.opengl.GLProgram;
import lime.utils.Log;
@ -32,6 +33,9 @@ class RuntimePostEffectShader extends FlxRuntimeShader
// equals (camera.viewLeft, camera.viewTop, camera.viewRight, camera.viewBottom)
uniform vec4 uCameraBounds;
// equals (frame.left, frame.top, frame.right, frame.bottom)
uniform vec4 uFrameBounds;
// screen coord -> world coord conversion
// returns world coord in px
vec2 screenToWorld(vec2 screenCoord) {
@ -56,6 +60,25 @@ class RuntimePostEffectShader extends FlxRuntimeShader
return (worldCoord - offset) / scale;
}
// screen coord -> frame coord conversion
// returns normalized frame coord
vec2 screenToFrame(vec2 screenCoord) {
float left = uFrameBounds.x;
float top = uFrameBounds.y;
float right = uFrameBounds.z;
float bottom = uFrameBounds.w;
float width = right - left;
float height = bottom - top;
float clampedX = clamp(screenCoord.x, left, right);
float clampedY = clamp(screenCoord.y, top, bottom);
return vec2(
(clampedX - left) / (width),
(clampedY - top) / (height)
);
}
// internally used to get the maximum `openfl_TextureCoordv`
vec2 bitmapCoordScale() {
return openfl_TextureCoordv / screenCoord;
@ -80,6 +103,8 @@ class RuntimePostEffectShader extends FlxRuntimeShader
{
super(fragmentSource, null, glVersion);
uScreenResolution.value = [FlxG.width, FlxG.height];
uCameraBounds.value = [0, 0, FlxG.width, FlxG.height];
uFrameBounds.value = [0, 0, FlxG.width, FlxG.height];
}
// basically `updateViewInfo(FlxG.width, FlxG.height, FlxG.camera)` is good
@ -89,6 +114,12 @@ class RuntimePostEffectShader extends FlxRuntimeShader
uCameraBounds.value = [camera.viewLeft, camera.viewTop, camera.viewRight, camera.viewBottom];
}
public function updateFrameInfo(frame:FlxFrame)
{
// NOTE: uv.width is actually the right pos and uv.height is the bottom pos
uFrameBounds.value = [frame.uv.x, frame.uv.y, frame.uv.width, frame.uv.height];
}
override function __createGLProgram(vertexSource:String, fragmentSource:String):GLProgram
{
try

8
source/funkin/graphics/shaders/RuntimeRainShader.hx
View file

@ -32,6 +32,14 @@ class RuntimeRainShader extends RuntimePostEffectShader
return time = value;
}
public var spriteMode(default, set):Bool = false;
function set_spriteMode(value:Bool):Bool
{
this.setBool('uSpriteMode', value);
return spriteMode = value;
}
// The scale of the rain depends on the world coordinate system, so higher resolution makes
// the raindrops smaller. This parameter can be used to adjust the total scale of the scene.
// The size of the raindrops is proportional to the value of this parameter.