Fix particle sizes, and add tools for comparing renderers

Particles: Direct3D 9's size limit evidently isn't the documented 64 pixels; unclamped (up to 2048) they match the client's renderer. A compare view shows the left half's scene over the right half, both renderers side by side; %TEMP%\t5de-renderer-view.txt switches views and %TEMP%\t5de-renderer-shaders\fixed_function.hlsl replaces the shaders while the client runs. The renderer process runs from a copy, so the program can be replaced meanwhile. The adapter recognizes only the textures and buffers it made (others reach the client renderer unchanged) and logs the others and render targets.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

renderer/scene.hpp

@@ -6,6 +6,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <span>
+#include <string>
 #include <unordered_map>
 
 #include "EngineFactoryD3D11.h"
@@ -23,6 +24,9 @@ public:
     // present).
     bool execute(std::span<const std::byte> commands, int offsetX, bool draw);
 
+    // Replaces the shaders' source (the built-in one by default): for trying changes while the client runs.
+    void setShaderSource(std::string source);
+
     // When the adapter sent the last frame carried out (QueryPerformanceCounter).
     [[nodiscard]] std::uint64_t lastSentAt() const { return lastSentAt_; }
 
@@ -111,6 +115,7 @@ private:
     std::unordered_map<std::uint32_t, Buffer> buffers_;
     std::unordered_map<std::uint32_t, Shaders> shaders_;
     std::unordered_map<std::uint32_t, Pipeline> pipelines_;
+    std::string shaderSource_;
 
     Constants constants_{};
     State state_;