Refactor source position calculation in map_operation

by flooring it would break reading in deswizzled files from maps that were offset. bdifirit1 is offset by (0 px, 8 px) so we'd do the division and divide and floor causing it all to be off by 8 px.

Author: Sebanisu

src/opengl/main/map_operation.cpp

@@ -394,11 +394,11 @@ QuadStrip get_triangle_strip(
      // source_position and destination_position are in TILE_SIZE cordinates.
      // TILE_SIZE default is 16x16. So we pass in the scaled up source_tile_size
      // and destination_tile_size and do the conversion.
-     constexpr static auto tile_size = static_cast<float>(map_group::TILE_SIZE);
-     const glm::vec2 aligned_source  = glm::floor(source_position / tile_size);
+     constexpr static auto tile_size = static_cast<float>(map_group::TILE_SIZE);     
+     const glm::vec2       base_source = source_position / tile_size;
      return { .uv_min
-              = (aligned_source * source_tile_size) / source_texture_size,
-              .uv_max = ((aligned_source + glm::vec2(1)) * source_tile_size)
+              = (base_source * source_tile_size) / source_texture_size,
+              .uv_max = ((base_source + glm::vec2(1)) * source_tile_size)
                         / source_texture_size,
               .draw_pos
               = (destination_position / tile_size) * destination_tile_size };
@@ -576,4 +576,4 @@ void save_modified_map(
        path,
        "");
 }
-}// namespace ff_8
+}// namespace ff_8