From 8b34934755acd66d42cad81131c4c7ff3f414dd1 Mon Sep 17 00:00:00 2001
From: Nick Fisher <nick.fisher@avinium.com>
Date: Mon, 17 Mar 2025 16:37:51 +0800
Subject: [PATCH] add TRenderer

---
 .../native/include/c_api/TRenderer.h          |  32 +++++
 thermion_dart/native/src/c_api/TRenderer.cpp  | 121 ++++++++++++++++++
 2 files changed, 153 insertions(+)
 create mode 100644 thermion_dart/native/include/c_api/TRenderer.h
 create mode 100644 thermion_dart/native/src/c_api/TRenderer.cpp

diff --git a/thermion_dart/native/include/c_api/TRenderer.h b/thermion_dart/native/include/c_api/TRenderer.h
new file mode 100644
index 00000000..32e4dc1d
--- /dev/null
+++ b/thermion_dart/native/include/c_api/TRenderer.h
@@ -0,0 +1,32 @@
+#ifndef _T_RENDERER_H
+#define _T_RENDERER_H
+
+#include "APIExport.h"
+#include "APIBoundaryTypes.h"
+#include "TMaterialInstance.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+EMSCRIPTEN_KEEPALIVE void Renderer_setClearOptions(TRenderer *tRenderer, double clearR, double clearG, double clearB, double clearA, uint8_t clearStencil, bool clear, bool discard);
+EMSCRIPTEN_KEEPALIVE bool Renderer_beginFrame(TRenderer *tRenderer, TSwapChain *tSwapChain, uint64_t frameTimeInNanos);
+EMSCRIPTEN_KEEPALIVE void Renderer_endFrame(TRenderer *tRenderer);
+EMSCRIPTEN_KEEPALIVE void Renderer_render(TRenderer *tRenderer, TView *tView);
+EMSCRIPTEN_KEEPALIVE void Renderer_renderStandaloneView(TRenderer *tRenderer, TView *tView);
+EMSCRIPTEN_KEEPALIVE void Renderer_readPixels(
+    TRenderer *tRenderer,
+    TView *tView,
+    TRenderTarget *tRenderTarget,
+    TPixelDataFormat tPixelBufferFormat,
+    TPixelDataType tPixelDataType,
+    uint8_t *out
+);
+
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/thermion_dart/native/src/c_api/TRenderer.cpp b/thermion_dart/native/src/c_api/TRenderer.cpp
new file mode 100644
index 00000000..c3e99e4f
--- /dev/null
+++ b/thermion_dart/native/src/c_api/TRenderer.cpp
@@ -0,0 +1,121 @@
+#ifdef _WIN32
+#include "ThermionWin32.h"
+#endif
+
+#include "Log.hpp"
+
+#include <thread>
+#include <functional>
+
+#include <filament/Engine.h>
+#include <filament/Fence.h>
+#include <filament/Renderer.h>
+#include <filament/SwapChain.h>
+#include <filament/Texture.h>
+#include <filament/Viewport.h>
+#include <filament/View.h>
+#include <filament/math/mat4.h>
+
+#include "c_api/TTexture.h"
+
+#ifdef __cplusplus
+namespace thermion
+{
+    extern "C"
+    {
+
+#endif
+
+#include "c_api/ThermionDartApi.h"
+
+EMSCRIPTEN_KEEPALIVE void Renderer_setClearOptions(TRenderer *tRenderer, double clearR, double clearG, double clearB, double clearA, uint8_t clearStencil, bool clear, bool discard) {
+    auto *renderer = reinterpret_cast<filament::Renderer *>(tRenderer);
+    filament::Renderer::ClearOptions clearOpts;
+    clearOpts.clearColor = filament::math::float4 { static_cast<float>(clearR), static_cast<float>(clearG), static_cast<float>(clearB),static_cast<float>(clearA)};
+    clearOpts.clear = clear;
+    clearOpts.discard = discard;
+    clearOpts.clearStencil = clearStencil;
+    renderer->setClearOptions(clearOpts);
+}
+
+EMSCRIPTEN_KEEPALIVE bool Renderer_beginFrame(TRenderer *tRenderer, TSwapChain *tSwapChain, uint64_t frameTimeInNanos) {
+    auto *renderer = reinterpret_cast<filament::Renderer *>(tRenderer);
+    auto *swapChain = reinterpret_cast<filament::SwapChain *>(tSwapChain);
+    return renderer->beginFrame(swapChain, frameTimeInNanos);
+}
+
+EMSCRIPTEN_KEEPALIVE void Renderer_endFrame(TRenderer *tRenderer) {
+    auto *renderer = reinterpret_cast<filament::Renderer *>(tRenderer);
+    renderer->endFrame();
+}
+
+EMSCRIPTEN_KEEPALIVE void Renderer_render(TRenderer *tRenderer, TView *tView) {
+    auto *renderer = reinterpret_cast<filament::Renderer *>(tRenderer);
+    auto *view = reinterpret_cast<filament::View *>(tView);
+    renderer->render(view);
+}
+
+EMSCRIPTEN_KEEPALIVE void Renderer_renderStandaloneView(TRenderer *tRenderer, TView *tView) {
+    auto *renderer = reinterpret_cast<filament::Renderer *>(tRenderer);
+    auto *view = reinterpret_cast<filament::View *>(tView);
+    renderer->renderStandaloneView(view);
+}
+
+class CaptureCallbackHandler : public filament::backend::CallbackHandler
+{
+  void post(void *user, Callback callback)
+  {
+    callback(user);
+    delete this;
+  }
+};
+
+
+EMSCRIPTEN_KEEPALIVE void Renderer_readPixels(
+    TRenderer *tRenderer,
+    TView *tView,
+    TRenderTarget *tRenderTarget,
+    TPixelDataFormat tPixelBufferFormat,
+    TPixelDataType tPixelDataType,
+    uint8_t *out) {
+    
+    auto *renderer = reinterpret_cast<filament::Renderer *>(tRenderer);
+    auto *renderTarget = reinterpret_cast<filament::RenderTarget *>(tRenderTarget);
+    auto *view = reinterpret_cast<filament::View *>(tView);
+
+    filament::Viewport const &vp = view->getViewport();
+
+    size_t pixelBufferSize = vp.width * vp.height * 4;
+
+    filament::backend::PixelDataFormat pixelBufferFormat = static_cast<filament::backend::PixelDataFormat>(tPixelBufferFormat);
+    filament::backend::PixelDataType pixelDataType = static_cast<filament::backend::PixelDataType>(tPixelDataType);
+
+    auto *dispatcher = new CaptureCallbackHandler();
+    auto callback = [](void *buf, size_t size, void *data)
+    {
+      
+    };
+
+
+    auto pbd = filament::Texture::PixelBufferDescriptor(
+        out, pixelBufferSize,
+        pixelBufferFormat,
+        pixelDataType,
+        dispatcher,
+        callback,
+        out
+    );
+
+    if(renderTarget) {
+        renderer->readPixels(renderTarget, 0, 0, vp.width, vp.height, std::move(pbd));
+    } else {
+        renderer->readPixels(0, 0, vp.width, vp.height, std::move(pbd));
+    }
+
+}
+
+
+#ifdef __cplusplus
+    }
+}
+#endif