12_graphics_pipeline_complete.diff

diff --git a/../steps/11_render_passes/main.go b/../steps/12_graphics_pipeline_complete/main.go
index 81b6945..00e5503 100644
--- a/../steps/11_render_passes/main.go
+++ b/../steps/12_graphics_pipeline_complete/main.go
@@ -60,8 +60,9 @@ type HelloTriangleApplication struct {
 	swapchainExtent      core1_0.Extent2D
 	swapchainImageViews  []core1_0.ImageView
 
-	renderPass     core1_0.RenderPass
-	pipelineLayout core1_0.PipelineLayout
+	renderPass       core1_0.RenderPass
+	pipelineLayout   core1_0.PipelineLayout
+	graphicsPipeline core1_0.Pipeline
 }
 
 func (app *HelloTriangleApplication) Run() error {
@@ -152,6 +153,10 @@ appLoop:
 }
 
 func (app *HelloTriangleApplication) cleanup() {
+	if app.graphicsPipeline != nil {
+		app.graphicsPipeline.Destroy(nil)
+	}
+
 	if app.pipelineLayout != nil {
 		app.pipelineLayout.Destroy(nil)
 	}
@@ -536,26 +541,26 @@ func (app *HelloTriangleApplication) createGraphicsPipeline() error {
 	}
 	defer fragShader.Destroy(nil)
 
-	_ = &core1_0.PipelineVertexInputStateCreateInfo{}
+	vertexInput := &core1_0.PipelineVertexInputStateCreateInfo{}
 
-	_ = &core1_0.PipelineInputAssemblyStateCreateInfo{
+	inputAssembly := &core1_0.PipelineInputAssemblyStateCreateInfo{
 		Topology:               core1_0.PrimitiveTopologyTriangleList,
 		PrimitiveRestartEnable: false,
 	}
 
-	_ = &core1_0.PipelineShaderStageCreateInfo{
+	vertStage := core1_0.PipelineShaderStageCreateInfo{
 		Stage:  core1_0.StageVertex,
 		Module: vertShader,
 		Name:   "main",
 	}
 
-	_ = &core1_0.PipelineShaderStageCreateInfo{
+	fragStage := core1_0.PipelineShaderStageCreateInfo{
 		Stage:  core1_0.StageFragment,
 		Module: fragShader,
 		Name:   "main",
 	}
 
-	_ = &core1_0.PipelineViewportStateCreateInfo{
+	viewport := &core1_0.PipelineViewportStateCreateInfo{
 		Viewports: []core1_0.Viewport{
 			{
 				X:        0,
@@ -574,7 +579,7 @@ func (app *HelloTriangleApplication) createGraphicsPipeline() error {
 		},
 	}
 
-	_ = &core1_0.PipelineRasterizationStateCreateInfo{
+	rasterization := &core1_0.PipelineRasterizationStateCreateInfo{
 		DepthClampEnable:        false,
 		RasterizerDiscardEnable: false,
 
@@ -587,13 +592,13 @@ func (app *HelloTriangleApplication) createGraphicsPipeline() error {
 		LineWidth: 1.0,
 	}
 
-	_ = &core1_0.PipelineMultisampleStateCreateInfo{
+	multisample := &core1_0.PipelineMultisampleStateCreateInfo{
 		SampleShadingEnable:  false,
 		RasterizationSamples: core1_0.Samples1,
 		MinSampleShading:     1.0,
 	}
 
-	_ = &core1_0.PipelineColorBlendStateCreateInfo{
+	colorBlend := &core1_0.PipelineColorBlendStateCreateInfo{
 		LogicOpEnabled: false,
 		LogicOp:        core1_0.LogicOpCopy,
 
@@ -611,6 +616,29 @@ func (app *HelloTriangleApplication) createGraphicsPipeline() error {
 		return err
 	}
 
+	pipelines, _, err := app.device.CreateGraphicsPipelines(nil, nil, []core1_0.GraphicsPipelineCreateInfo{
+		{
+			Stages: []core1_0.PipelineShaderStageCreateInfo{
+				vertStage,
+				fragStage,
+			},
+			VertexInputState:   vertexInput,
+			InputAssemblyState: inputAssembly,
+			ViewportState:      viewport,
+			RasterizationState: rasterization,
+			MultisampleState:   multisample,
+			ColorBlendState:    colorBlend,
+			Layout:             app.pipelineLayout,
+			RenderPass:         app.renderPass,
+			Subpass:            0,
+			BasePipelineIndex:  -1,
+		},
+	})
+	if err != nil {
+		return err
+	}
+	app.graphicsPipeline = pipelines[0]
+
 	return nil
 }