完成背景的推送。

samples/api/texture_loading/texture_loading.cpp

@@ -562,6 +562,19 @@ void TextureLoading::build_command_buffers()
 
 		vkCmdBindDescriptorSets(draw_cmd_buffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline_layout_bg, 0, 1, &descriptor_set_bg, 0, NULL);
 		vkCmdBindPipeline(draw_cmd_buffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.background);
+
+		// 在命令缓冲区记录时
+		float myFloatValue = 1.5f; // 你的 float 值
+
+		vkCmdPushConstants(
+			draw_cmd_buffers[i],                          // 命令缓冲区
+			pipeline_layout_bg,                     // 管线布局
+			VK_SHADER_STAGE_VERTEX_BIT,       // 
+			0,                                  // 偏移量（字节）
+			sizeof(float),                      // 数据大小（字节）
+			&myFloatValue                       // 数据指针
+		);
+
 		vkCmdDraw(draw_cmd_buffers[i], 6, 1, 0, 0);
 
 		//vkCmdBindDescriptorSets(draw_cmd_buffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline_layout, 0, 1, &descriptor_set, 0, NULL);
@@ -759,6 +772,14 @@ void TextureLoading::setup_descriptor_set_layout_bg()
 			&descriptor_set_layout_bg,
 			1);
 
+	VkPushConstantRange pushConstantRange{};
+	pushConstantRange.stageFlags =  VK_SHADER_STAGE_VERTEX_BIT; // 只在片段着色器中使用
+	pushConstantRange.offset = 0;
+	pushConstantRange.size = sizeof(float); // 或者 sizeof(PushConstants)
+
+	pipeline_layout_create_info.pushConstantRangeCount = 1;
+	pipeline_layout_create_info.pPushConstantRanges = &pushConstantRange;
+
 	VK_CHECK(vkCreatePipelineLayout(get_device().get_handle(), &pipeline_layout_create_info, nullptr, &pipeline_layout_bg));
 }
 
@@ -1427,18 +1448,21 @@ bool TextureLoading::prepare(const vkb::ApplicationOptions& options)
 	size_t dataSize = testImage.size();
 	processWithVulkan(testImage.data(), width, height, rowStride, dataSize, texture_point);
 
+#ifndef _WIN32
 	width = 640;
 	height = 480;
 	rowStride = width * 4;
 	auto arrowImage = generateSimpleTestImage(width, height, 80);
 	dataSize = arrowImage.size();
 	processWithVulkan(arrowImage.data(), width, height, rowStride, dataSize, cam_text);
+#else
 
-	//const char* filename = "face.png";
+	const char* filename = "face.png";
-	//std::vector<unsigned char> image; 
+	std::vector<unsigned char> image; 
-	//unsigned w, h;
+	unsigned w, h;
-	//unsigned error = lodepng::decode(image, w, h, filename, LCT_RGBA, 8);
+	unsigned error = lodepng::decode(image, w, h, filename, LCT_RGBA, 8);
-	//processWithVulkan(image.data(), w, h, w*4, image.size(), cam_text);
+	processWithVulkan(image.data(), w, h, w*4, image.size(), cam_text);
+#endif
 
 	width = 256;
 	height = 256;

samples/api/texture_loading/texture_loading.h

@@ -47,6 +47,12 @@ struct LineVertex {
 	glm::vec3 lineEnd;   // 该顶点所属线段的终点
 };
 
+// 最简单的结构体 - 只有一个 float
+struct PushConstants {
+	float myValue;
+};
+
+
 class TextureLoading : public ApiVulkanSample
 {
 public: