Mech Gunfire Effect – Smoke Shader

Gunfire smoke effect for your projects, this one is about the gunfire smoke, switched to use blend_add with alpha_scissor_threshold as a perfomance optmization instead of blend_mix. The muzzleflare effect: https://godotshaders.com/shader/mech-gunfire-effect-muzzleflash-shader/

Shader code

shader_type spatial;
render_mode blend_add,depth_draw_opaque,cull_disabled,
diffuse_toon,specular_disabled,unshaded,shadows_disabled,
ambient_light_disabled,fog_disabled;
uniform sampler2D texture_albedo : source_color,filter_linear_mipmap,repeat_enable;

uniform int particles_anim_h_frames;
uniform int particles_anim_v_frames;
//uniform bool particles_anim_loop;

void vertex() {
	mat4 mat_world = mat4(normalize(INV_VIEW_MATRIX[0]), normalize(INV_VIEW_MATRIX[1]) ,normalize(INV_VIEW_MATRIX[2]), MODEL_MATRIX[3]);
	mat_world = mat_world * mat4(vec4(cos(INSTANCE_CUSTOM.x), -sin(INSTANCE_CUSTOM.x), 0.0, 0.0), vec4(sin(INSTANCE_CUSTOM.x), cos(INSTANCE_CUSTOM.x), 0.0, 0.0), vec4(0.0, 0.0, 1.0, 0.0), vec4(0.0, 0.0, 0.0, 1.0));
	MODELVIEW_MATRIX = VIEW_MATRIX * mat_world;
	MODELVIEW_MATRIX = MODELVIEW_MATRIX * mat4(vec4(length(MODEL_MATRIX[0].xyz), 0.0, 0.0, 0.0),vec4(0.0, length(MODEL_MATRIX[1].xyz), 0.0, 0.0), vec4(0.0, 0.0, length(MODEL_MATRIX[2].xyz), 0.0), vec4(0.0, 0.0, 0.0, 1.0));
	MODELVIEW_NORMAL_MATRIX = mat3(MODELVIEW_MATRIX);
	
	float h_frames = float(particles_anim_h_frames);
	float v_frames = float(particles_anim_v_frames);
	float particle_total_frames = float(particles_anim_h_frames * particles_anim_v_frames);
	float particle_frame = floor(INSTANCE_CUSTOM.z * float(particle_total_frames));
	
	particle_frame = clamp(particle_frame, 0.0, particle_total_frames - 1.0);
	// We don't want to cycle for particle animation frames, only offset, so the condition is removed.
	//if (!particles_anim_loop) {
		//particle_frame = clamp(particle_frame, 0.0, particle_total_frames - 1.0);
	//} else {
		//particle_frame = mod(particle_frame, particle_total_frames);
	//}
	
	UV /= vec2(h_frames, v_frames);
	UV += vec2(mod(particle_frame, h_frames) / h_frames, floor((particle_frame + 0.5) / h_frames) / v_frames);
}

void fragment() {
	vec4 albedo_tex = texture(texture_albedo,UV);
	ALBEDO = albedo_tex.rgb * COLOR.rgb * albedo_tex.a;
	ALPHA = (albedo_tex.a * COLOR.a);
	ALPHA_SCISSOR_THRESHOLD = 0.001;
}

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