From e8f45553290e3f3689d0c99d82e0f5731af35341 Mon Sep 17 00:00:00 2001
From: LTDCrissOK <martines.nene98@gmail.com>
Date: Sat, 7 Nov 2026 15:36:06 -0300
Subject: [PATCH] Implement GSOpenGLBackend class for OpenGL support

---
 ps2xRuntime/src/lib/gs/gs_opengl_backend.cpp | 62 ++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 ps2xRuntime/src/lib/gs/gs_opengl_backend.cpp

diff --git a/ps2xRuntime/src/lib/gs/gs_opengl_backend.cpp b/ps2xRuntime/src/lib/gs/gs_opengl_backend.cpp
new file mode 100644
index 0000000000..e4df320e87
--- /dev/null
+++ b/ps2xRuntime/src/lib/gs/gs_opengl_backend.cpp
@@ -0,0 +1,62 @@
+#include "runtime/gs/gs_opengl_backend.h"
+#include "runtime/gs/gs_cpu_backend.h"
+
+#if defined(__ANDROID__)
+#include <GLES3/gl32.h>
+#include <EGL/egl.h>
+#endif
+
+#include <algorithm>
+#include <cstring>
+
+GSOpenGLBackend::GSOpenGLBackend()
+    : m_cpu(std::make_unique<GSCpuBackend>())
+{
+#if defined(__ANDROID__)
+    // Esto solo es válido después de crear y hacer current el contexto EGL
+    // en el hilo que vaya a utilizar OpenGL.
+    const GLubyte* version = glGetString(GL_VERSION);
+    if (version != nullptr)
+    {
+        std::strncpy(m_glVersion, reinterpret_cast<const char*>(version),
+                     sizeof(m_glVersion) - 1);
+        GLint major = 0;
+        GLint minor = 0;
+        glGetIntegerv(GL_MAJOR_VERSION, &major);
+        glGetIntegerv(GL_MINOR_VERSION, &minor);
+        m_gles32Available = (major > 3) || (major == 3 && minor >= 2);
+    }
+#endif
+}
+
+GSOpenGLBackend::~GSOpenGLBackend() = default;
+
+bool GSOpenGLBackend::IsOpenGLES32Available() const
+{
+    return m_gles32Available;
+}
+
+const char* GSOpenGLBackend::GetOpenGLVersion() const
+{
+    return m_glVersion;
+}
+
+void GSOpenGLBackend::Initialize(uint8_t* vram, uint32_t vramSize)
+{
+    m_cpu->Initialize(vram, vramSize);
+}
+void GSOpenGLBackend::Reset() { m_cpu->Reset(); }
+void GSOpenGLBackend::Submit(const GSPrimitiveBatch& batch) { m_cpu->Submit(batch); }
+void GSOpenGLBackend::LoadClut(const GSTex0Reg& a, const GSTexClutReg& b) { m_cpu->LoadClut(a, b); }
+void GSOpenGLBackend::BeginTransfer(const GSTransferCommand& command) { m_cpu->BeginTransfer(command); }
+void GSOpenGLBackend::UploadImage(const uint8_t* data, uint32_t sizeBytes) { m_cpu->UploadImage(data, sizeBytes); }
+void GSOpenGLBackend::Flush() { m_cpu->Flush(); }
+void GSOpenGLBackend::TextureFlush() { m_cpu->TextureFlush(); }
+void GSOpenGLBackend::Sync(GSSyncReason reason) { m_cpu->Sync(reason); }
+PresentationFrame GSOpenGLBackend::Present(const GSPresentationRequest& request) { return m_cpu->Present(request); }
+bool GSOpenGLBackend::ClearFramebuffer(const GSContext& context, uint32_t rgba) { return m_cpu->ClearFramebuffer(context, rgba); }
+uint32_t GSOpenGLBackend::ConsumeLocalToHostBytes(uint8_t* dst, uint32_t maxBytes) { return m_cpu->ConsumeLocalToHostBytes(dst, maxBytes); }
+uint32_t GSOpenGLBackend::ReadVram(uint32_t psm, uint32_t base, uint32_t bw, uint32_t x, uint32_t y) const { return m_cpu->ReadVram(psm, base, bw, x, y); }
+void GSOpenGLBackend::WriteVram(uint32_t psm, uint32_t base, uint32_t bw, uint32_t x, uint32_t y, uint32_t value) { m_cpu->WriteVram(psm, base, bw, x, y, value); }
+void GSOpenGLBackend::SnapshotVram(std::vector<uint8_t>& out) const { m_cpu->SnapshotVram(out); }
+GSTransferSnapshot GSOpenGLBackend::GetTransferSnapshot() const { return m_cpu->GetTransferSnapshot(); }