Initial commit

renderer/render_pass.jai

@@ -0,0 +1,97 @@
+DEPTH_STENCIL_SLOT :: 42;
+
+// The slots used by the render pass render targets
+// Slots 10-17 are reserved for the passes
+Render_Target_Shader_Slots :: enum {
+    SLOT0 :: 10;
+    SLOT1 :: 11;
+    SLOT2 :: 12;
+    SLOT3 :: 13;
+    SLOT4 :: 14;
+    SLOT5 :: 15;
+    SLOT6 :: 16;
+    SLOT7 :: 17;
+}
+
+Render_Target_Info :: struct {
+    format: Format;
+    width: u32;
+    height: u32;
+
+    clear_color: Color;
+}
+
+Depth_Stencil_Info :: struct {
+    enabled: bool;
+    format: Format;
+    width: u32;
+    height: u32;
+}
+
+Render_Pass_Input_Info :: struct {
+    pass_handle: Render_Pass_Handle;
+    rt_index: u32; // the index into the render pass
+}
+
+Render_Pass :: struct {
+    name: string;
+
+    inputs: [..] Render_Pass_Input_Info;
+
+    uses_backbuffer: bool;
+    render_targets: [..] Render_Target_Handle;
+    clear_colors: [..] Color;
+    depth_stencil: Depth_Stencil_Buffer_Handle;
+    has_depth_stencil: bool;
+
+    width: u32;
+    height: u32;
+
+    callback: (pass: Render_Pass);
+}
+
+create_render_pass :: (graph: *Render_Graph, name: string, callback: (Render_Pass), render_target_infos: [] Render_Target_Info = .[], depth_stencil_info : Depth_Stencil_Info = .{}, uses_backbuffer: bool = false) -> Render_Pass_Handle {
+    render_pass : Render_Pass;
+    render_pass.name = copy_string(name);
+    render_pass.uses_backbuffer = uses_backbuffer;
+    render_pass.callback = callback;
+
+    if depth_stencil_info.enabled {
+        render_pass.has_depth_stencil = true;
+        render_pass.depth_stencil = create_depth_stencil_buffer(depth_stencil_info.width, depth_stencil_info.height, 0);
+        render_pass.width = depth_stencil_info.width;
+        render_pass.height = depth_stencil_info.height;
+    }
+
+    array_reserve(*render_pass.render_targets, render_target_infos.count);
+    array_reserve(*render_pass.clear_colors, render_target_infos.count);
+
+    for render_target_infos {
+        array_add(*render_pass.render_targets, create_render_target(it.width, it.height, it.format));
+        array_add(*render_pass.clear_colors, it.clear_color);
+        render_pass.width = it.width;
+        render_pass.height = it.height;
+    }
+
+    return parray_add(*graph.render_passes, render_pass);
+}
+
+add_render_pass_input :: (graph: *Render_Graph, to_pass: Render_Pass_Handle, from_pass: Render_Pass_Handle, rt_index: u32) {
+    info : Render_Pass_Input_Info;
+    info.pass_handle = from_pass;
+    info.rt_index = rt_index;
+
+    pass := parray_get(*graph.render_passes, to_pass);
+    array_add(*pass.inputs, info);
+}
+
+get_texture_from_pass :: (name: string) -> Texture_Handle {
+    for renderer.render_graph.render_passes {
+        if it.name == name {
+            rt := parray_get(renderer.render_targets, it.render_targets[0]);
+            return rt.texture;
+        }
+    }
+
+    return xx 0;
+}