Rewrite shaders to use OpenGL ES3 syntax

Signed-off-by: renderexpert <expert@renderconsulting.co.uk>

libs/shaders/program_params.hpp

@@ -48,17 +48,22 @@ private:
 
 #define ALIGNMENT alignas(16)
 
+// NOTE: structs may contain dummy elements to fit MSL and GLSL struct alignment rules
+// 1. Add new fields in order from the highest byte size to the lowest, it minimizes alignment overhead
+// 2. Keep 16 bytes alignment for the whole struct, it complements the size of the latest element to vec4
+// 3. Consider vec3 as vec4, add float complement and don't reuse it
+
 struct ALIGNMENT MapProgramParams
 {
   glsl::mat4 m_modelView;
   glsl::mat4 m_projection;
   glsl::mat4 m_pivotTransform;
+  glsl::vec2 m_contrastGamma;
   float m_opacity = 1.0f;
   float m_zScale = 1.0f;
   float m_interpolation = 1.0f;
   float m_isOutlinePass = 1.0f;
-  glsl::vec2 m_contrastGamma;
-
+  
   BIND_PROGRAMS(MapProgramParams,
     Program::Area,
     Program::Area3d,
@@ -100,14 +105,14 @@ struct ALIGNMENT RouteProgramParams
   glsl::vec4 m_color;
   glsl::vec4 m_maskColor;
   glsl::vec4 m_outlineColor;
+  glsl::vec4 m_fakeColor;
+  glsl::vec4 m_fakeOutlineColor;
+  glsl::vec2 m_fakeBorders;
   glsl::vec2 m_pattern;
   glsl::vec2 m_angleCosSin;
   float m_arrowHalfWidth = 0.0f;
   float m_opacity = 1.0f;
-  glsl::vec2 m_fakeBorders;
-  glsl::vec4 m_fakeColor;
-  glsl::vec4 m_fakeOutlineColor;
-
+  
   BIND_PROGRAMS(RouteProgramParams,
     Program::Route,
     Program::RouteDash,
@@ -122,10 +127,13 @@ struct ALIGNMENT TrafficProgramParams
   glsl::mat4 m_pivotTransform;
   glsl::vec4 m_trafficParams;
   glsl::vec3 m_outlineColor;
-  float m_outline = 0.0f;
+  float m_dummy1; // alignment
   glsl::vec3 m_lightArrowColor;
-  float m_opacity = 1.0f;
+  float m_dummy2; // alignment
   glsl::vec3 m_darkArrowColor;
+  float m_dummy3; // alignment
+  float m_outline = 0.0f;
+  float m_opacity = 1.0f;
 
   BIND_PROGRAMS(TrafficProgramParams,
     Program::Traffic,
@@ -139,6 +147,7 @@ struct ALIGNMENT TransitProgramParams
   glsl::mat4 m_projection;
   glsl::mat4 m_pivotTransform;
   glsl::vec3 m_params;
+  float m_dummy1; // alignment
   float m_lineHalfWidth = 0.0f;
   float m_maxRadius = 0.0f;
 
@@ -171,8 +180,9 @@ struct ALIGNMENT ShapesProgramParams
   glsl::mat4 m_projection;
   glsl::mat4 m_pivotTransform;
   glsl::vec3 m_position;
-  float m_accuracy = 0.0;
+  float m_dummy1; // alignment
   glsl::vec2 m_lineParams;
+  float m_accuracy = 0.0;
   float m_zScale = 1.0f;
   float m_opacity = 1.0f;
   float m_azimut = 0.0;