完成在Android上渲染三角形

app/src/main/assets/shaders/simple_shader.frag

@@ -0,0 +1,7 @@
+#version 450
+layout(location = 0) in vec3 fragColor;
+layout(location = 0) out vec4 outColor;
+
+void main() {
+    outColor = vec4(fragColor, 1.0);
+}

app/src/main/assets/shaders/simple_shader.vert

@@ -0,0 +1,19 @@
+#version 450
+layout(location = 0) out vec3 fragColor;
+
+vec2 positions[3] = vec2[](
+    vec2(0.0, -0.5),
+    vec2(0.5, 0.5),
+    vec2(-0.5, 0.5)
+);
+
+vec3 colors[3] = vec3[](
+    vec3(1.0, 0.0, 0.0),
+    vec3(0.0, 1.0, 0.0),
+    vec3(0.0, 0.0, 1.0)
+);
+
+void main() {
+    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
+    fragColor = colors[gl_VertexIndex];
+}

app/src/main/cpp/main.cpp

@@ -4,6 +4,7 @@
 #include <game-activity/GameActivity.h>
 #include "AndroidOut.h"
 #include "Application.h"
+#include <android/asset_manager.h>
 #include <chrono>
 #include <thread>
 
@@ -12,6 +13,7 @@ extern "C" {
 
 android_app* g_android_app = nullptr;
 Application* g_Application = nullptr;
+AAssetManager* g_assetManager = nullptr;
 
 void handle_cmd(android_app *pApp, int32_t cmd) {
     switch (cmd) {
@@ -30,6 +32,7 @@ void handle_cmd(android_app *pApp, int32_t cmd) {
 void android_main(struct android_app *pApp) {
     aout << "Welcome to android_main" << std::endl;
     g_android_app = pApp;
+    g_assetManager = pApp->activity->assetManager;
     Application application;
     g_Application = &application;
     pApp->onAppCmd = handle_cmd;

vulkan/AppBase.cpp

@@ -1,14 +1,23 @@
 #include "AppBase.h"
 #include <assert.h>
 
+#ifdef  _WIN32
+#else
+#include <android/asset_manager.h>
+extern AAssetManager* g_assetManager;
+#endif //  _WIN32
+
 
 void VK_CHECK(VkResult ret)
 {
     assert(ret == VK_SUCCESS);
 }
 
-std::vector<char> AppBase::readFile(const std::string& enginePath)
+std::vector<char> AppBase::readFile(const std::string& path)
 {
+    std::vector<char> buffer;
+#ifdef _WIN32
+	std::string enginePath = "app/src/main/assets/" + path;
 	std::ifstream file{ enginePath, std::ios::ate | std::ios::binary };
 
 	if (!file.is_open())
@@ -17,13 +26,26 @@ std::vector<char> AppBase::readFile(const std::string& enginePath)
 	}
 
 	size_t fileSize = static_cast<size_t>(file.tellg());
-	std::vector<char> buffer(fileSize);
+	buffer.resize(fileSize);
 
 	file.seekg(0);
 	file.read(buffer.data(), fileSize);
 	file.close();
+#else
+	AAsset* asset = AAssetManager_open(g_assetManager, path.c_str(), AASSET_MODE_BUFFER);
+	if (!asset) {
+		logOut << "Failed to load file: " << path.c_str() << std::endl;
+		return buffer;
+	}
+
+	size_t length = AAsset_getLength(asset);
+    buffer.resize(length);
+	AAsset_read(asset, buffer.data(), length);
+	AAsset_close(asset);
+#endif // _WIN32
 	return buffer;
 }
+
 VkShaderModule AppBase::createShaderModule(VkDevice& device, const std::vector<char>& code)
 {
 	VkShaderModuleCreateInfo createInfo{};

vulkan/Application.cpp

@@ -181,47 +181,22 @@ void Application::createLogicalDevice() {
 	vkGetDeviceQueue(device, indices.presentFamily.value(), 0, &presentQueue);
 }
 
-inline VkExtent2D choose_extent(
-    VkExtent2D        request_extent,
-    const VkExtent2D &min_image_extent,
-    const VkExtent2D &max_image_extent,
-    const VkExtent2D &current_extent)
-{
-	if (current_extent.width == 0xFFFFFFFF)
-	{
-		return request_extent;
-	}
-
-	if (request_extent.width < 1 || request_extent.height < 1)
-	{
-		logOut << "(Swapchain) Image extent ("<< request_extent.width << ", " <<  request_extent.height << ") not supported. Selecting ("<< current_extent.width << ", " << current_extent.height << ")." << std::endl;
-		return current_extent;
-	}
-
-	request_extent.width = std::max(request_extent.width, min_image_extent.width);
-	request_extent.width = std::min(request_extent.width, max_image_extent.width);
-
-	request_extent.height = std::max(request_extent.height, min_image_extent.height);
-	request_extent.height = std::min(request_extent.height, max_image_extent.height);
-
-	return request_extent;
-}
 
 void Application::createSwapChain() {
 	// 选择交换链格式、颜色空间和分辨率
-	VkSurfaceFormatKHR surfaceFormat = { VK_FORMAT_B8G8R8A8_SRGB, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR };
+	VkSurfaceFormatKHR surfaceFormat = { VK_FORMAT_R8G8B8A8_SRGB, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR };
 	VkPresentModeKHR presentMode = VK_PRESENT_MODE_FIFO_KHR;
-	VkExtent2D extent = { 1, 1 };
-
     VkSurfaceCapabilitiesKHR surface_capabilities{};
     vkGetPhysicalDeviceSurfaceCapabilitiesKHR(this->physicalDevice,  this->surface, &surface_capabilities);
 
-	extent = choose_extent(extent, surface_capabilities.minImageExtent, surface_capabilities.maxImageExtent, surface_capabilities.currentExtent);
+    VkExtent2D extent = surface_capabilities.currentExtent;
+
+	uint32_t imageCount = 2;
 	// 创建交换链
 	VkSwapchainCreateInfoKHR createInfo{};
 	createInfo.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
 	createInfo.surface = surface;
-	createInfo.minImageCount = 2; // 双缓冲
+	createInfo.minImageCount = imageCount; // 双缓冲
 	createInfo.imageFormat = surfaceFormat.format;
 	createInfo.imageColorSpace = surfaceFormat.colorSpace;
 	createInfo.imageExtent = extent;
@@ -252,8 +227,7 @@ void Application::createSwapChain() {
 		throw std::runtime_error("failed to create swap chain!");
 	}
 
-	// 获取交换链图像
-	uint32_t imageCount;
+
 	vkGetSwapchainImagesKHR(device, swapChain, &imageCount, nullptr);
 	swapChainImages.resize(imageCount);
 	vkGetSwapchainImagesKHR(device, swapChain, &imageCount, swapChainImages.data());