Validate renderer shader descriptors

src/renderer_api/renderer_api.cpp

@@ -5,6 +5,34 @@
 
 namespace pp::renderer {
 
+namespace {
+
+[[nodiscard]] bool is_empty_c_string(const char* text) noexcept
+{
+    return text == nullptr || text[0] == '\0';
+}
+
+[[nodiscard]] pp::foundation::Status validate_shader_stage_source(
+    ShaderStageSource source,
+    const char* stage_name) noexcept
+{
+    if (is_empty_c_string(source.entry_point)) {
+        return pp::foundation::Status::invalid_argument(stage_name);
+    }
+
+    if (source.source == nullptr || source.source_size == 0U) {
+        return pp::foundation::Status::invalid_argument("shader source must not be empty");
+    }
+
+    if (source.source_size > max_shader_source_bytes) {
+        return pp::foundation::Status::out_of_range("shader source exceeds the configured limit");
+    }
+
+    return pp::foundation::Status::success();
+}
+
+}
+
 std::uint32_t bytes_per_pixel(TextureFormat format) noexcept
 {
     switch (format) {
@@ -123,6 +151,29 @@ pp::foundation::Status validate_mesh_desc(MeshDesc desc) noexcept
     return pp::foundation::Status::invalid_argument("mesh topology is not supported");
 }
 
+pp::foundation::Status validate_shader_program_desc(ShaderProgramDesc desc) noexcept
+{
+    if (desc.debug_name == nullptr) {
+        return pp::foundation::Status::invalid_argument("shader debug name must not be null");
+    }
+
+    const auto vertex_status = validate_shader_stage_source(
+        desc.vertex,
+        "vertex shader entry point must not be empty");
+    if (!vertex_status.ok()) {
+        return vertex_status;
+    }
+
+    const auto fragment_status = validate_shader_stage_source(
+        desc.fragment,
+        "fragment shader entry point must not be empty");
+    if (!fragment_status.ok()) {
+        return fragment_status;
+    }
+
+    return pp::foundation::Status::success();
+}
+
 pp::foundation::Status validate_readback_region(TextureDesc desc, ReadbackRegion region) noexcept
 {
     const auto extent_status = validate_extent(desc.extent);