Custom PPSSPP shaders

[Endarko]

whether shader like this can be used in ppsspp? I've tried changing the name of shaders.vert to shaders.fsh but the game screen becomes a black screen

#version 300 es
precision highp float;
in vec3 position;
in mediump vec3 normal;
in vec2 texcoord;
uniform mat4 u_proj;
uniform mat4 u_world;
uniform mat4 u_view;
uniform vec4 u_uvscaleoffset;
uniform vec3 u_lightpos0;
uniform lowp vec3 u_lightambient0;
uniform lowp vec3 u_lightdiffuse0;
uniform vec3 u_lightpos1;
uniform lowp vec3 u_lightambient1;
uniform lowp vec3 u_lightdiffuse1;
uniform vec3 u_lightpos2;
uniform lowp vec3 u_lightambient2;
uniform lowp vec3 u_lightdiffuse2;
uniform lowp vec4 u_ambient;
uniform lowp vec3 u_matdiffuse;
uniform lowp vec4 u_matspecular;
uniform lowp vec3 u_matemissive;
uniform lowp vec4 u_matambientalpha;
uniform highp vec2 u_fogcoef;
out lowp vec4 v_color0;
out mediump vec3 v_texcoord;
out mediump float v_fogdepth;
void main() {
vec3 worldpos = (u_world * vec4(position.xyz, 1.0)).xyz;
mediump vec3 worldnormal = normalize((u_world * vec4(normal, 0.0)).xyz);
vec4 viewPos = u_view * vec4(worldpos, 1.0);
gl_Position = u_proj * viewPos;
lowp vec4 lightSum0 = u_ambient * u_matambientalpha + vec4(u_matemissive, 0.0);
vec3 toLight;
lowp vec3 diffuse;
mediump float ldot;
toLight = u_lightpos0;
ldot = max(dot(toLight, worldnormal), 0.0);
diffuse = (u_lightdiffuse0 * u_matdiffuse) * ldot;
lightSum0.rgb += (u_lightambient0 * u_matambientalpha.rgb + diffuse);
toLight = u_lightpos1;
ldot = max(dot(toLight, worldnormal), 0.0);
diffuse = (u_lightdiffuse1 * u_matdiffuse) * ldot;
lightSum0.rgb += (u_lightambient1 * u_matambientalpha.rgb + diffuse);
toLight = u_lightpos2;
ldot = max(dot(toLight, worldnormal), 0.0);
diffuse = (u_lightdiffuse2 * u_matdiffuse) * ldot;
lightSum0.rgb += (u_lightambient2 * u_matambientalpha.rgb + diffuse);
v_color0 = clamp(lightSum0, 9.0, 1.0);
v_texcoord = vec3(texcoord.xy * u_uvscaleoffset.xy, 0.0);
v_fogdepth = (viewPos.z + u_fogcoef.x) * u_fogcoef.y;
}