From da10aaab41012a4af63cd5f6ed5591b162206c4b Mon Sep 17 00:00:00 2001
From: Camden Dixie O'Brien <cobrien@witekio.com>
Date: Sat, 4 Oct 2025 14:50:53 +0100
Subject: [PATCH] Create shadow map image

---
 gpu.c | 14 ++++++++++++++
 gpu.h |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/gpu.c b/gpu.c
index 65aa425..1af311c 100644
--- a/gpu.c
+++ b/gpu.c
@@ -13,6 +13,8 @@
 
 #define MAX_MODEL_COUNT 4
 
+#define SHADOW_IMG_SIZE 2048
+
 #define NELEMS(arr) (sizeof(arr) / sizeof(arr[0]))
 
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
@@ -392,6 +394,14 @@ void gpu_init(gpu_ctx_t *ctx, GLFWwindow *window, const char *name)
 		assert(result == VK_SUCCESS);
 	}
 
+	// Set up shadow image
+	create_img(
+	    ctx, VK_FORMAT_D32_SFLOAT, SHADOW_IMG_SIZE, SHADOW_IMG_SIZE,
+	    VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT
+	        | VK_IMAGE_USAGE_SAMPLED_BIT,
+	    VK_IMAGE_ASPECT_DEPTH_BIT, &ctx->shadow_img, &ctx->shadow_mem,
+	    &ctx->shadow_view);
+
 	// Set up depth image
 	create_img(
 	    ctx, VK_FORMAT_D32_SFLOAT, ctx->swapchain_extent.width,
@@ -867,6 +877,10 @@ void gpu_cleanup(const gpu_ctx_t *ctx)
 	vkDestroyRenderPass(ctx->dev, ctx->shadow_pass, nullptr);
 	vkDestroyRenderPass(ctx->dev, ctx->render_pass, nullptr);
 
+	vkDestroyImageView(ctx->dev, ctx->shadow_view, nullptr);
+	vkDestroyImage(ctx->dev, ctx->shadow_img, nullptr);
+	vkFreeMemory(ctx->dev, ctx->shadow_mem, nullptr);
+
 	vkDestroyImageView(ctx->dev, ctx->depth_view, nullptr);
 	vkDestroyImage(ctx->dev, ctx->depth_img, nullptr);
 	vkFreeMemory(ctx->dev, ctx->depth_mem, nullptr);
diff --git a/gpu.h b/gpu.h
index ec1c36c..29cb39c 100644
--- a/gpu.h
+++ b/gpu.h
@@ -19,6 +19,9 @@ typedef struct {
 	VkExtent2D swapchain_extent;
 	uint32_t swapchain_img_count;
 	VkImageView swapchain_img_views[MAX_FRAMES_IN_FLIGHT];
+	VkImage shadow_img;
+	VkDeviceMemory shadow_mem;
+	VkImageView shadow_view;
 	VkImage depth_img;
 	VkDeviceMemory depth_mem;
 	VkImageView depth_view;