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2025-09-04 10:54:47 +08:00
commit 6bc8f61b18
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+/* Copyright (c) 2020, Arm Limited
+ * Copyright (c) 2020, Bradley Austin Davis
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 the "License";
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include <memory>
+
+#include <glad/glad.h>
+
+#include "common/vk_common.h"
+
+constexpr uint32_t SHARED_TEXTURE_DIMENSION = 512;
+
+#ifdef WIN32
+constexpr const char *HOST_MEMORY_EXTENSION_NAME    = VK_KHR_EXTERNAL_MEMORY_WIN32_EXTENSION_NAME;
+constexpr const char *HOST_SEMAPHORE_EXTENSION_NAME = VK_KHR_EXTERNAL_SEMAPHORE_WIN32_EXTENSION_NAME;
+#	define glImportSemaphore glImportSemaphoreWin32HandleEXT
+#	define glImportMemory glImportMemoryWin32HandleEXT
+#	define GL_HANDLE_TYPE GL_HANDLE_TYPE_OPAQUE_WIN32_EXT
+#	define VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_WIN32_BIT
+#	define VK_EXTERNAL_MEMORY_HANDLE_TYPE VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_WIN32_BIT
+#else
+constexpr const char *HOST_MEMORY_EXTENSION_NAME    = VK_KHR_EXTERNAL_MEMORY_FD_EXTENSION_NAME;
+constexpr const char *HOST_SEMAPHORE_EXTENSION_NAME = VK_KHR_EXTERNAL_SEMAPHORE_FD_EXTENSION_NAME;
+#	define glImportSemaphore glImportSemaphoreFdEXT
+#	define glImportMemory glImportMemoryFdEXT
+#	define GL_HANDLE_TYPE GL_HANDLE_TYPE_OPAQUE_FD_EXT
+#	define VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_OPAQUE_FD_BIT
+#	define VK_EXTERNAL_MEMORY_HANDLE_TYPE VK_EXTERNAL_MEMORY_HANDLE_TYPE_OPAQUE_FD_BIT
+#endif
+
+#ifdef VK_USE_PLATFORM_ANDROID_KHR
+// Android
+#	include <EGL/egl.h>
+#	include <EGL/eglext.h>
+
+struct ContextData
+{
+	EGLConfig  config{nullptr};
+	EGLSurface surface{EGL_NO_SURFACE};
+	EGLContext context{EGL_NO_CONTEXT};
+	EGLDisplay display{EGL_NO_DISPLAY};
+};
+#else
+// Desktop
+#	include <GLFW/glfw3.h>
+#	include <GLFW/glfw3native.h>
+
+struct ContextData
+{
+	GLFWwindow *window;
+};
+#endif
+
+class OffscreenContext
+{
+  public:
+	OffscreenContext();
+
+	~OffscreenContext();
+
+	// Shared
+	GLuint build_program(const char *vertex_shader_source, const char *fragment_shader_source);
+
+  private:
+	// Platform specific
+	void init_context();
+
+	void destroy_context();
+
+	std::string get_shader_header();
+
+	ContextData data;
+
+	GLuint load_shader(const char *shader_source, GLenum shader_type);
+};