[orx-fx] Make FilmGrain and HashBlur filters work on web (#226)

orx-fx/src/commonMain/kotlin/grain/FilmGrain.kt

@@ -1,3 +1,5 @@
+package org.openrndr.extra.fx.grain
+
 import org.openrndr.draw.Filter
 import org.openrndr.extra.fx.fx_film_grain
 import org.openrndr.extra.fx.mppFilterShader

orx-fx/src/shaders/glsl/blur/hash-blur.frag

@@ -1,13 +1,22 @@
 // based on Hashed blur by David Hoskins.
 // License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
 
-uniform float radius;
+#ifdef OR_IN_OUT
 in vec2 v_texCoord0;
+#else
+varying vec2 v_texCoord0;
+#endif
+
 uniform sampler2D tex0;
+uniform vec2 textureSize0;
+uniform float radius;
 uniform float time;
 uniform int samples;
 uniform float gain;
+
+#ifndef OR_GL_FRAGCOLOR
 out vec4 o_color;
+#endif
 
 #define TAU 6.28318530718
 
@@ -15,8 +24,8 @@ out vec4 o_color;
 #define HASHSCALE 443.8975
 vec2 hash22(vec2 p) {
 	vec3 p3 = fract(vec3(p.xyx) * HASHSCALE);
-    p3 += dot(p3, p3.yzx+19.19);
-    return fract(vec2((p3.x + p3.y)*p3.z, (p3.x+p3.z)*p3.y));
+	p3 += dot(p3, p3.yzx+19.19);
+	return fract(vec2((p3.x + p3.y)*p3.z, (p3.x+p3.z)*p3.y));
 }
 
 vec2 sampleTexture(inout vec2 r) {
@@ -28,20 +37,33 @@ vec2 sampleTexture(inout vec2 r) {
 
 //-------------------------------------------------------------------------------------------
 vec4 blur(vec2 uv, float radius) {
-    vec2 circle = vec2(radius) * (vec2(1.0) / textureSize(tex0, 0));
+	vec2 circle = vec2(radius) * (vec2(1.0) / textureSize0);
 	vec2 random = hash22(uv + vec2(time));
 
 	vec4 acc = vec4(0.0);
-	for (int i = 0; i < samples; i++) {
+
+	for (int i = 0; i < 100; i++) {
+		if (i > samples) break;
+		#ifndef OR_GL_TEXTURE2D
 		acc += texture(tex0, uv + circle * sampleTexture(random));
-    }
+		#else
+		acc += texture2D(tex0, uv + circle * sampleTexture(random));
+		#endif
+	}
 	return acc / float(samples);
 }
 
 //-------------------------------------------------------------------------------------------
 void main() {
 	vec2 uv = v_texCoord0;
-    float radiusSqr = pow(radius, 2.0);
-	o_color = blur(uv, radiusSqr);
-	o_color.rgb *= gain;
+	float radiusSqr = pow(radius, 2.0);
+
+	vec4 result = blur(uv, radiusSqr);
+	result.rgb *= gain;
+
+	#ifdef OR_GL_FRAGCOLOR
+	gl_FragColor = result;
+	#else
+	o_color = result;
+	#endif
 }

orx-fx/src/shaders/glsl/grain/film-grain.frag

@@ -97,7 +97,7 @@ void main() {
 
     // After this you would normally perform tone mapping,
     // apply the grain before that.
-    #ifndef OR_GL_FRACOLOR
+    #ifndef OR_GL_FRAGCOLOR
     o_output.rgb = color;
     o_output.a = 1.0;
     #else