Avoid trying to setup uniform for invalid locations

src/rcore.c

@@ -2525,25 +2525,34 @@ void SetShaderValue(Shader shader, int locIndex, const void *value, int uniformT
 // Set shader uniform value vector
 void SetShaderValueV(Shader shader, int locIndex, const void *value, int uniformType, int count)
 {
+    if (locIndex > -1)
+    {
         rlEnableShader(shader.id);
         rlSetUniform(locIndex, value, uniformType, count);
         //rlDisableShader();      // Avoid reseting current shader program, in case other uniforms are set
+    }
 }
 
 // Set shader uniform value (matrix 4x4)
 void SetShaderValueMatrix(Shader shader, int locIndex, Matrix mat)
 {
+    if (locIndex > -1)
+    {
         rlEnableShader(shader.id);
         rlSetUniformMatrix(locIndex, mat);
         //rlDisableShader();
+    }
 }
 
 // Set shader uniform value for texture
 void SetShaderValueTexture(Shader shader, int locIndex, Texture2D texture)
 {
+    if (locIndex > -1)
+    {
         rlEnableShader(shader.id);
         rlSetUniformSampler(locIndex, texture.id);
         //rlDisableShader();
+    }
 }
 
 // Get a ray trace from mouse position