2D pixelated grass waving shader

Questions
#41

No disrespect intended to @Pawel @sergey.lerg who are of course the undisputed kings of shaders :face_with_hand_over_mouth:

4 Likes
#42

I’m a king of shaders like BK is king of burgers :joy: very interesting idea however, amazing how seamless it is with this approach!

4 Likes
#43

I have been trying to create a simple 2D swaying shader and I think I may have done it. Lol.
Git it a try. It might do the job…

– Vertex program

attribute mediump vec4 position;
attribute mediump vec2 texcoord0;

uniform mediump mat4 mtx_view;
uniform mediump mat4 mtx_proj;

uniform mediump vec4 time;
uniform mediump vec4 speed;
uniform mediump vec4 intensity;

varying mediump vec2 var_texcoord0;

void main() {
    var_texcoord0 = texcoord0;
    vec4 p = position;

    p.x += 10.0 * (sin(speed.x * time.x) + cos(speed.x * time.x)) * intensity.x * max(0.0, texcoord0.y);
    gl_Position = mtx_proj * mtx_view * p;
}

– Script

go.property("speed", 1.0)
go.property("intensity", 1.6)

function init(self)
	-- Time variable
	self.time = 0
	-- Start the randomizer
	math.randomseed(os.time())

	-- Values to pass along to the VP shader
	self.intensity = (self.intensity == 0 and 1.0 or self.intensity)
	self.speed = (self.speed == 0 and 1.0 or self.speed)
	--
	sprite.set_constant("#sprite", "intensity", vmath.vector4(self.intensity))
	sprite.set_constant("#sprite", "speed", vmath.vector4(self.speed, 0, 0, 0))
end


function update(self, dt)

	self.time = self.time +  dt 
	print ("Time: ", self.time)

	-- Send time to the VP shader
	sprite.set_constant("#sprite", "time", vmath.vector4(self.time, 0, 0, 0))
end
3 Likes
#44

Bah! It needs to be better! Working on it

#45

What does it look like? Can you share a video?

#46

Will put something up tomorrow. Saw this too late. :frowning:

#47

This is one of the shaders I am working on and I cannot get the “crease” or the bend out from the center.

– flip.vp, sprite.fp

attribute mediump vec4 position;
attribute mediump vec2 texcoord0;

uniform mediump mat4 view_proj;
uniform mediump vec4 time;

varying mediump vec2 var_texcoord0;

lowp float speed = 4;

void main() {
    var_texcoord0 = texcoord0;
    vec4 p = position;
    vec2 uv = texcoord0;
    float y = time.x;

    // SOOOOO CLOSE, I think :(
    gl_Position = view_proj * p * vec4(cos(y), 1.0 - (uv.y) * uv.x * (sin(y) *.5) , 1.0, 1.0);

}

2 Likes
#48

Howdy!

I have gotten my shader to a decent state, but now I am stuck with z positioning issues in the GUI. :frowning: I am posting the source here in case anyone wants to see if they can fix it or come up with a better way. Until then, I cannot attach child nodes properly…


GUI_ShaderTest.zip (328.0 KB)

#49

Why shader and not rendering them with a perspective projection and simply rotating the game object?

2 Likes
#50

I actually have in my game a perspective camera for this, but I was trying to learn how to do things in glsl. :grin:

1 Like
#51

I was also trying to figure a way to create a perspective cam for GUI where the node positions are respected in 2D space just as the Orthographic cam does but still allow perspective. I really wanted to implement fisheye correction too, if possible. I used to have to do that with my old DOS raycaster engines.

1 Like