Hey there!
Looks like Im in trouble trying to adapt that shader:
To defold:
varying mediump vec2 var_texcoord0;
uniform lowp sampler2D sbuffer;
uniform lowp vec4 tint;
float normalize(float min1, float max1, float value) {
return (value - min1) / (max1 - min1);
}
float map(float min1, float max1, float min2, float max2, float value) {
return mix(min2, max2, normalize(min1, max1, value));
}
const float blurAmount = 2.0;
const float maxPos = 0.5;
const float bottom = 0.25;
const float top = 0.75;
const float left = 0.25;
const float right = 0.75;
void main()
{
vec2 res = vec2(1.0, 1.0);
vec2 uv = var_texcoord0.xy * res.xy;
float position = 0.0;
// TOP / BOTTOM
if(uv.y <= bottom) {
position = map(0.0, bottom, maxPos, 0.0, uv.y);
} else if(uv.y >= top) {
position = map(top, 1.0, 0.0, maxPos, uv.y);
}
// LEFT / RIGHT
if(uv.x <= left) {
position += map(0.0, left, maxPos, 0.0, uv.x);
} else if(uv.x >= top) {
position += map(right, 1.0, 0.0, maxPos, uv.x);
}
float bias = position * blurAmount;
gl_FragColor = texture2D(sbuffer, uv, bias);
}
It seems like that bias in the end is useless and out of syntax. Need help!
1 Like
This is the answer:
Edit:
If you chance sampler to use mipmap, it will work.
1 Like
Oh, got it. Bias is a third param and right where it should be.
Switching to any mipmap makes screen black. =(
Probably you are doing something wrong. It works for me.
Here is my .fp.
varying mediump vec2 var_texcoord0;
uniform lowp sampler2D tex0;
float normalizea(float min1, float max1, float value)
{
return (value - min1) / (max1 - min1);
}
float map(float min1, float max1, float min2, float max2, float value)
{
return mix(min2, max2, normalizea(min1, max1, value));
}
const float blurAmount = 5.0;
const float maxPos = 0.5;
const float bottom = 0.25;
const float top = 0.75;
const float left = 0.25;
const float right = 0.75;
void main()
{
vec2 uv = var_texcoord0.xy;
float position = 0.0;
position = map(0.0, bottom, maxPos, 0.0, uv.y) * float(uv.y <= bottom) +
map(top, 1.0, 0.0, maxPos, uv.y) * float(uv.y >= top) +
map(0.0, left, maxPos, 0.0, uv.x) * float(uv.x <= left) +
map(right, 1.0, 0.0, maxPos, uv.x) * float(uv.x >= top);
float bias = position * blurAmount;
gl_FragColor = texture2D(tex0, uv.xy, bias);
}
And this is the test project:
tilt-shift.zip (157.1 KB)
2 Likes
Hm… I render all the game and gui to texture and then use shaders on it. Maybe that’s the problem. Guess I need to check your project more closely.
Huge thanks! 
Hard to tell, it might be. but consider this; using bias can be expensive on gpu as mentioned here: Easy question...What is bias param in textureXD? - #2 by k_szczech - OpenGL - Khronos Forums.
There is nothing special about it. It is just a Defold 3D Template. Render script is same as default.
1 Like
