[RESOLVED] Apply shader when shooting weapon?

[Numnzel]

Hello.
As the title says, I'm trying to apply a shader when I shoot a weapon, there is any way to do it?

EDIT: I should say that it's a screen shader.
I don't understand this subject so much, so it may be relevant.

This is the shader code:

---

Code: Select all

void main()
{
	float start;
	float offsy = 0;
	int angle = 20;
	int time = 270;
	
	if (start == 0) {
		start = timer;
	}
	
	vec2 texCoord = TexCoord.st;
	vec2 offset = vec2(0,0);
	
	if (timer-start < time) {
		
		if (texCoord.y > sin(angle) * texCoord.x + offsy) {
			
			offset.x = sin(angle) * 0.05 * (timer-start)/time;
			offset.y = cos(angle) * 0.05 * (timer-start)/time;
		}
		else {
			offset.x = sin(angle) * -0.05 * (timer-start)/time;
			offset.y = cos(angle) * -0.05 * (timer-start)/time;
		}
	}
	
	texCoord += offset;
	
	FragColor = texture(InputTexture, texCoord);
}

Thank you.

[Cherno]

The only way I could think of is to have seperate MODELDEF entries, so the shooting frames can have different skins, and only those skins have the shader aplied via GLDEFS.

[Numnzel]

Sorry, I'm not sure if I explained it correctly.

I'm actually not using models, and it's not a shader for a weapon, it's a GLSL shader that it's applied on the entire screen. And I want to use it as an effect after shooting a weapon.

[MFG38]

If your weapon code is in ZScript, you'll need to write a custom function that enables the shader upon firing the weapon and attach it to the weapon's Fire state. The documentation regarding using shaders in ZScript is unfortunately rather lacking - you'll basically have to look at other people's shaders to learn how it works.

This snippet from GZDoom's base.zs should be of some help, though:

Code: Select all

struct Shader native
{
	native clearscope static void SetEnabled(PlayerInfo player, string shaderName, bool enable);
	native clearscope static void SetUniform1f(PlayerInfo player, string shaderName, string uniformName, float value);
	native clearscope static void SetUniform2f(PlayerInfo player, string shaderName, string uniformName, vector2 value);
	native clearscope static void SetUniform3f(PlayerInfo player, string shaderName, string uniformName, vector3 value);
	native clearscope static void SetUniform1i(PlayerInfo player, string shaderName, string uniformName, int value);
}

[Numnzel]

Thanks, I actually did it!

This is the code I used to call the shader and animate it, and then reseting it, for it may help someone else:

Zscript:

---

Code: Select all

class slash : doomimpball {
	
	int k;
	PlayerInfo p;
	
	states {
		spawn:
			BAL1 A 0 NoDelay {
				k = 0;
				p = players[consoleplayer];
			}
			BAL1 A 1 {
				Shader.SetEnabled(p, "realityslash", true);
				Shader.SetUniform1f(p, "realityslash", "timer", k++);
			}
			wait;
		death:
			BAL1 A 0 {
				k = 0;
				Shader.SetEnabled(p, "realityslash", false);
			}
			goto super::death;
	}
}

GLDefs:

---

Code: Select all

HardwareShader PostProcess Scene
{
	Shader	"GLSL/realityslash.shader" 330
	Name	"realityslash"
	Uniform float timer
}

Shader:

---

Code: Select all

void main()
{
	int angle = 20;
	
	vec2 texCoord = TexCoord.st;
	vec2 offset = vec2(0,0);
	
	if (texCoord.y > sin(angle) * texCoord.x) {
		
		offset.x = sin(angle);
		offset.y = cos(angle);
	}
	else {
		
		offset.x = -sin(angle);
		offset.y = -cos(angle);
	}
	
	texCoord += offset * 0.0002 * timer;
	
	FragColor = texture(InputTexture, texCoord);
}

Although it is unfinished, if someone uses this code please don't forget to acknowledge me and my friend Bélsel, who helped me with the algorithm.
Thank you both for your time.