Move initial GL state policy into renderer GL

src/renderer_gl/opengl_capabilities.cpp

@@ -212,6 +212,18 @@ pp::renderer::RenderDeviceFeatures render_device_features(OpenGlCapabilities cap
     };
 }
 
+OpenGlInitialState panopainter_initial_state() noexcept
+{
+    return OpenGlInitialState {
+        .depth_test_enabled = false,
+        .depth_test_state = depth_test_state(),
+        .source_color_factor = source_alpha_blend_factor(),
+        .destination_color_factor = one_minus_source_alpha_blend_factor(),
+        .color_equation = add_blend_equation(),
+        .alpha_equation = max_blend_equation(),
+    };
+}
+
 std::uint32_t extension_count_query() noexcept
 {
     return gl_num_extensions;

src/renderer_gl/opengl_capabilities.h

@@ -115,11 +115,21 @@ struct OpenGlWindowsWglContextConfig {
     std::array<std::int32_t, 15> pixel_format_attributes {};
 };
 
+struct OpenGlInitialState {
+    bool depth_test_enabled = false;
+    std::uint32_t depth_test_state = 0;
+    std::uint32_t source_color_factor = 0;
+    std::uint32_t destination_color_factor = 0;
+    std::uint32_t color_equation = 0;
+    std::uint32_t alpha_equation = 0;
+};
+
 [[nodiscard]] OpenGlCapabilities detect_opengl_capabilities(
     std::span<const std::string_view> extensions,
     OpenGlRuntime runtime) noexcept;
 [[nodiscard]] pp::renderer::RenderDeviceFeatures render_device_features(
     OpenGlCapabilities capabilities) noexcept;
+[[nodiscard]] OpenGlInitialState panopainter_initial_state() noexcept;
 
 [[nodiscard]] std::uint32_t extension_count_query() noexcept;
 [[nodiscard]] std::uint32_t extension_string_name() noexcept;