Move OpenGL shape draw mappings

src/renderer_gl/opengl_capabilities.cpp

@@ -5,8 +5,13 @@ namespace pp::renderer::gl {
 namespace {
 
 constexpr std::uint32_t gl_unsigned_byte = 0x1401U;
+constexpr std::uint32_t gl_unsigned_short = 0x1403U;
+constexpr std::uint32_t gl_unsigned_int = 0x1405U;
 constexpr std::uint32_t gl_float = 0x1406U;
 constexpr std::uint32_t gl_half_float = 0x140BU;
+constexpr std::uint32_t gl_points = 0x0000U;
+constexpr std::uint32_t gl_lines = 0x0001U;
+constexpr std::uint32_t gl_triangles = 0x0004U;
 constexpr std::uint32_t gl_red = 0x1903U;
 constexpr std::uint32_t gl_rgb = 0x1907U;
 constexpr std::uint32_t gl_rgba = 0x1908U;
@@ -124,4 +129,38 @@ const char* framebuffer_status_name(std::uint32_t status) noexcept
     }
 }
 
+std::uint32_t index_type_for_index_size(std::uint32_t index_size_bytes) noexcept
+{
+    switch (index_size_bytes) {
+    case 2:
+        return gl_unsigned_short;
+    case 4:
+        return gl_unsigned_int;
+    default:
+        return 0U;
+    }
+}
+
+std::uint32_t primitive_mode_for_fill_count(std::uint32_t vertex_or_index_count) noexcept
+{
+    if (vertex_or_index_count == 1U) {
+        return gl_points;
+    }
+
+    if (vertex_or_index_count == 2U) {
+        return gl_lines;
+    }
+
+    return gl_triangles;
+}
+
+std::uint32_t primitive_mode_for_stroke_count(std::uint32_t vertex_or_index_count) noexcept
+{
+    if (vertex_or_index_count == 1U) {
+        return gl_points;
+    }
+
+    return gl_lines;
+}
+
 }