Move sampler border parameter to renderer gl

docs/modernization/build-inventory.md

@@ -135,11 +135,12 @@ Known local toolchain state:
   used by `RTT::create`. It also validates Shape index-type and fill/stroke
   primitive-mode mapping used by the legacy mesh draw path, plus the
   PanoPainter cube-face to OpenGL texture-target mapping used by `TextureCube`.
-  It also owns and validates sampler wrap S/T/R plus min/mag filter parameter
-  ordering used by legacy `Sampler`. The PanoPainter shader attribute binding
-  catalog used by legacy `Shader` creation also lives here. It also owns the
-  PanoPainter shader uniform catalog and legacy hash mapping used by `Shader`
-  active-uniform discovery and the uniform uniqueness check.
+  It also owns and validates sampler wrap S/T/R, min/mag filter, and desktop
+  border-color parameter mapping used by legacy `Sampler`. The PanoPainter
+  shader attribute binding catalog used by legacy `Shader` creation also lives
+  here. It also owns the PanoPainter shader uniform catalog and legacy hash
+  mapping used by `Shader` active-uniform discovery and the uniform uniqueness
+  check.
 - `windows-msvc-vcpkg-headless` validates manifest install/configure/build/test
   for the current headless component matrix; see DEBT-0007 for remaining app
   and platform triplet migration.

docs/modernization/roadmap.md

@@ -396,9 +396,9 @@ decisions used by legacy `Shape` drawing and the PanoPainter cube-face to
 OpenGL texture-target mapping used by `TextureCube` also live in
 `pp_renderer_gl`. The legacy app delegates extension, upload-format,
 framebuffer diagnostic, render-target texture parameter, mesh draw-mode, and
-cube-face texture-target interpretation to that backend library. Sampler wrap
-and min/mag filter parameter mapping for legacy `Sampler` also lives in
-`pp_renderer_gl`. The PanoPainter shader attribute
+cube-face texture-target interpretation to that backend library. Sampler wrap,
+min/mag filter, and desktop border-color parameter mapping for legacy
+`Sampler` also lives in `pp_renderer_gl`. The PanoPainter shader attribute
 binding catalog also lives in `pp_renderer_gl` and is consumed by legacy
 `Shader` creation. Shader uniform hashing, catalog validation, active-uniform
 mapping, and the legacy uniform uniqueness check now delegate to
@@ -648,7 +648,8 @@ Results:
   mode mapping, PanoPainter cube-face texture-target order, and the linear
   clamp-to-edge render-target texture parameter set used by `RTT::create`.
   Sampler parameter validation covers wrap S/T/R plus min/mag filter ordering
-  used by legacy `Sampler::set` and `Sampler::set_filter`.
+  used by legacy `Sampler::set` and `Sampler::set_filter`, plus the desktop
+  border-color parameter name used by `Sampler::set_border`.
   Shader attribute binding catalog validation covers the current `pos`, `uvs`,
   `uvs2`, `col`, and `nor` bindings and rejects empty, unnamed, null-name, and
   duplicate-name catalogs while preserving legacy shared locations. Shader

src/renderer_gl/opengl_capabilities.cpp

@@ -44,6 +44,7 @@ constexpr std::uint32_t gl_texture_min_filter = 0x2801U;
 constexpr std::uint32_t gl_texture_wrap_s = 0x2802U;
 constexpr std::uint32_t gl_texture_wrap_t = 0x2803U;
 constexpr std::uint32_t gl_texture_wrap_r = 0x8072U;
+constexpr std::uint32_t gl_texture_border_color = 0x1004U;
 constexpr std::uint32_t gl_clamp_to_edge = 0x812FU;
 
 [[nodiscard]] bool contains(std::string_view text, std::string_view needle) noexcept
@@ -237,4 +238,9 @@ std::array<OpenGlTextureParameter, 2> sampler_filter_parameters(
     };
 }
 
+std::uint32_t sampler_border_color_parameter_name() noexcept
+{
+    return gl_texture_border_color;
+}
+
 }

src/renderer_gl/opengl_capabilities.h

@@ -51,5 +51,6 @@ struct OpenGlTextureParameter {
 [[nodiscard]] std::array<OpenGlTextureParameter, 2> sampler_filter_parameters(
     std::uint32_t filter_min,
     std::uint32_t filter_mag) noexcept;
+[[nodiscard]] std::uint32_t sampler_border_color_parameter_name() noexcept;
 
 }

src/texture.cpp

@@ -332,7 +332,10 @@ void Sampler::set_border(glm::vec4 rgba)
     App::I->render_task([this, rgba]
     {
 #if USE_SAMPLER && !defined(__GLES__)
-        glSamplerParameterfv(id, GL_TEXTURE_BORDER_COLOR, glm::value_ptr(rgba));
+        glSamplerParameterfv(
+            id,
+            static_cast<GLenum>(pp::renderer::gl::sampler_border_color_parameter_name()),
+            glm::value_ptr(rgba));
 #endif // USE_SAMPLER
     });
 }

tests/renderer_gl/capabilities_tests.cpp

@@ -211,6 +211,8 @@ void maps_sampler_parameters(pp::tests::Harness& h)
     PP_EXPECT(h, filters[0].value == 0x2600U);
     PP_EXPECT(h, filters[1].name == 0x2800U);
     PP_EXPECT(h, filters[1].value == 0x2601U);
+
+    PP_EXPECT(h, pp::renderer::gl::sampler_border_color_parameter_name() == 0x1004U);
 }
 
 void exposes_shader_attribute_binding_catalog(pp::tests::Harness& h)