From f86026b588faad8b09052009250a5f29e6d6d255 Mon Sep 17 00:00:00 2001
From: Katajisto <t@ktj.st>
Date: Tue, 7 Oct 2025 23:05:24 +0300
Subject: [PATCH] use new nice rendering architecture to easily add shadowmap
 pass

---
 first.jai                       |  3 ---
 src/rendering/backend_sokol.jai |  7 +++++++
 src/rendering/pipelines.jai     | 37 ++++++++++++++++++++++++++++++++-
 src/rendering/rendering.jai     |  1 -
 src/rendering/tasks.jai         |  2 ++
 5 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/first.jai b/first.jai
index e4e925e..f415eb3 100644
--- a/first.jai
+++ b/first.jai
@@ -36,10 +36,7 @@ Iprof :: #import "Iprof"(IMPORT_MODE = .METAPROGRAM);
     set_build_options_dc(.{do_output = false});
 
     make_directory_if_it_does_not_exist("dist", recursive = true);
-
-
     {
-
         process_result, output, error := run_command("cp", "-r", "./resources", "./dist/", working_directory=tprint("%", #filepath));
         
     
diff --git a/src/rendering/backend_sokol.jai b/src/rendering/backend_sokol.jai
index f045b63..1f22ede 100644
--- a/src/rendering/backend_sokol.jai
+++ b/src/rendering/backend_sokol.jai
@@ -160,7 +160,14 @@ backend_process_command_buckets :: () {
         backend_handle_command(it);
     } 
 
+    // 2. Shadow pass
+	sg_begin_pass(*(sg_pass.{ action = state.pass_action_clear, attachments = g_shadowmap_attachments}));
+    for render_command_buckets.shadow {
+        backend_handle_command(it);
+    }    
+	sg_end_pass();
     current_trile_offset_index = 0; // This is not optimal, but it is nice and simple.
+    
     // 2. Reflection pass
 	sg_begin_pass(*(sg_pass.{ action = state.pass_action_clear, attachments = gPipelines.plane.attachments}));
     for render_command_buckets.reflection {
diff --git a/src/rendering/pipelines.jai b/src/rendering/pipelines.jai
index 1420f32..9b7184a 100644
--- a/src/rendering/pipelines.jai
+++ b/src/rendering/pipelines.jai
@@ -1,3 +1,5 @@
+SHADOWMAP_SIZE :: 2000;
+
 Pipeline_Binding :: struct {
     pipeline    : sg_pipeline;
     bind        : sg_bindings;
@@ -5,7 +7,10 @@ Pipeline_Binding :: struct {
     pass_action : sg_pass_action;
 }
 
-g_specular_lut : sg_image;
+g_specular_lut  : sg_image;
+g_shadowmap     : sg_image;
+g_shadowmap_img : sg_image; // Apparently we are requried to have one of these, sigh... we don't use this.
+g_shadowmap_attachments : sg_attachments;
 
 gPipelines : struct {
 
@@ -28,12 +33,42 @@ gPipelines : struct {
 
 }
 
+create_shadowmap_image :: () {
+    w : s32 = SHADOWMAP_SIZE;
+    h : s32 = SHADOWMAP_SIZE;
+
+    if g_shadowmap.id != INVALID_ID then sg_destroy_image(g_shadowmap);
+
+    depth_desc := sg_image_desc.{
+        width = w,
+        height = h,
+        pixel_format = .DEPTH_STENCIL,
+        render_target = true,
+    };
+    img_desc := sg_image_desc.{
+        width = w,
+        height = h,
+        pixel_format = .RGBA8,
+        render_target = true,
+    };
+    g_shadowmap = sg_make_image(*depth_desc);
+    g_shadowmap_img = sg_make_image(*img_desc);
+    attachmentsDesc : sg_attachments_desc;
+	attachmentsDesc = .{
+	    colors[0].image = g_shadowmap_img,
+	   	depth_stencil.image = g_shadowmap,
+	};
+    sg_destroy_attachments(g_shadowmap_attachments);
+    g_shadowmap_attachments = sg_make_attachments(*attachmentsDesc);
+}
+
 create_pipelines :: () {
     create_arbtri_pipeline();
     create_trixel_pipeline();
     create_trile_pipeline();
     create_sky_pipeline();
     create_plane_pipeline();
+    create_shadowmap_image();
 }
 
 TRIXEL_SIZE_HALF : float : 1.0/32.0;
diff --git a/src/rendering/rendering.jai b/src/rendering/rendering.jai
index 11362ea..d5edcf5 100644
--- a/src/rendering/rendering.jai
+++ b/src/rendering/rendering.jai
@@ -7,7 +7,6 @@
 
 */
 
-#load "groundplane.jai";
 #load "tasks.jai";
 #load "sky.jai";
 #load "core.jai";
diff --git a/src/rendering/tasks.jai b/src/rendering/tasks.jai
index 57c1550..05da6b5 100644
--- a/src/rendering/tasks.jai
+++ b/src/rendering/tasks.jai
@@ -76,6 +76,7 @@ tasks_to_commands :: () {
                 // Currently no need to draw trixels anywhere but the editor so no
                 // need for drawing them in the planar reflection pass...
                 // array_add(*render_command_buckets.reflection, drawCommand);
+
             case .TRILE;
                 trileTask := (cast(*Rendering_Task_Trile)it);
                 addPositionsCmd := New(Render_Command_Add_Trile_Positions,, temp);
@@ -87,6 +88,7 @@ tasks_to_commands :: () {
                 drawPositionsCmd.conf = trileTask.worldConf;
                 array_add(*render_command_buckets.reflection, drawPositionsCmd);
                 array_add(*render_command_buckets.main, drawPositionsCmd);
+                array_add(*render_command_buckets.shadow, drawPositionsCmd);
             case .SKY;
                 command := New(Render_Command_Sky,, temp);
                 command.worldConfig = (cast(*Rendering_Task_Sky)it).worldConfig;