Extract renderer shader catalog

src/renderer_api/shader_catalog.cpp

@@ -0,0 +1,91 @@
+#include "renderer_api/shader_catalog.h"
+
+#include <array>
+#include <string_view>
+
+namespace pp::renderer {
+
+namespace {
+
+constexpr std::array<ShaderCatalogEntry, 25> pano_catalog {
+    ShaderCatalogEntry { .name = "texture", .path = "data/shaders/texture.glsl" },
+    ShaderCatalogEntry { .name = "texture-alpha", .path = "data/shaders/texture-alpha.glsl" },
+    ShaderCatalogEntry { .name = "texture-mask", .path = "data/shaders/texture-mask.glsl" },
+    ShaderCatalogEntry { .name = "texture-colorize", .path = "data/shaders/texture-colorize.glsl" },
+    ShaderCatalogEntry { .name = "texture-blend", .path = "data/shaders/texture-blend.glsl" },
+    ShaderCatalogEntry { .name = "stroke-preview", .path = "data/shaders/stroke-preview.glsl" },
+    ShaderCatalogEntry { .name = "comp-erase", .path = "data/shaders/comp-erase.glsl" },
+    ShaderCatalogEntry { .name = "comp-draw", .path = "data/shaders/comp-draw.glsl" },
+    ShaderCatalogEntry { .name = "color", .path = "data/shaders/color.glsl" },
+    ShaderCatalogEntry { .name = "color-quad", .path = "data/shaders/color-quad.glsl" },
+    ShaderCatalogEntry { .name = "color-tri", .path = "data/shaders/color-tri.glsl" },
+    ShaderCatalogEntry { .name = "color-hue", .path = "data/shaders/color-hue.glsl" },
+    ShaderCatalogEntry { .name = "uvs", .path = "data/shaders/uvs.glsl" },
+    ShaderCatalogEntry { .name = "font", .path = "data/shaders/font.glsl" },
+    ShaderCatalogEntry { .name = "atlas", .path = "data/shaders/atlas.glsl" },
+    ShaderCatalogEntry { .name = "stroke", .path = "data/shaders/stroke.glsl" },
+    ShaderCatalogEntry { .name = "stroke-pad", .path = "data/shaders/stroke-pad.glsl" },
+    ShaderCatalogEntry { .name = "stroke-dilate", .path = "data/shaders/stroke-dilate.glsl" },
+    ShaderCatalogEntry { .name = "checkerboard", .path = "data/shaders/checkerboard.glsl" },
+    ShaderCatalogEntry { .name = "equirect", .path = "data/shaders/equirect.glsl" },
+    ShaderCatalogEntry { .name = "brush-stroke", .path = "data/shaders/stroke-instanced.glsl" },
+    ShaderCatalogEntry { .name = "vertex-color", .path = "data/shaders/vertex-color.glsl" },
+    ShaderCatalogEntry { .name = "lambert", .path = "data/shaders/lambert.glsl" },
+    ShaderCatalogEntry { .name = "lambert-lightmap", .path = "data/shaders/lightmap.glsl" },
+    ShaderCatalogEntry { .name = "bakeuv", .path = "data/shaders/bake-uv.glsl" },
+};
+
+[[nodiscard]] bool is_empty_c_string(const char* text) noexcept
+{
+    return text == nullptr || text[0] == '\0';
+}
+
+[[nodiscard]] bool has_shader_extension(std::string_view path) noexcept
+{
+    constexpr std::string_view extension = ".glsl";
+    return path.size() >= extension.size()
+        && path.substr(path.size() - extension.size()) == extension;
+}
+
+}
+
+std::span<const ShaderCatalogEntry> panopainter_shader_catalog() noexcept
+{
+    return pano_catalog;
+}
+
+pp::foundation::Status validate_shader_catalog(std::span<const ShaderCatalogEntry> catalog) noexcept
+{
+    if (catalog.empty()) {
+        return pp::foundation::Status::invalid_argument("shader catalog must not be empty");
+    }
+
+    if (catalog.size() > max_shader_catalog_entries) {
+        return pp::foundation::Status::out_of_range("shader catalog exceeds the configured limit");
+    }
+
+    for (std::size_t i = 0; i < catalog.size(); ++i) {
+        const auto& entry = catalog[i];
+        if (is_empty_c_string(entry.name)) {
+            return pp::foundation::Status::invalid_argument("shader catalog entry name must not be empty");
+        }
+
+        if (is_empty_c_string(entry.path)) {
+            return pp::foundation::Status::invalid_argument("shader catalog entry path must not be empty");
+        }
+
+        if (!has_shader_extension(entry.path)) {
+            return pp::foundation::Status::invalid_argument("shader catalog path must end with .glsl");
+        }
+
+        for (std::size_t j = i + 1U; j < catalog.size(); ++j) {
+            if (std::string_view(entry.name) == std::string_view(catalog[j].name)) {
+                return pp::foundation::Status::invalid_argument("shader catalog entry name is duplicated");
+            }
+        }
+    }
+
+    return pp::foundation::Status::success();
+}
+
+}