allow binding only a portion of a cbuffer

1 files changed, 10 insertions, 2 deletions

diff --git a/video.hpp b/video.hpp
index fa479f1..1ccc93d 100644
--- a/video.hpp
+++ b/video.hpp
@@ -44,7 +44,7 @@ struct Sampler_Id : public Primitive_Id<uint32_t> {
 	using Primitive_Id<uint32_t>::Primitive_Id;
 };
 
-#define descriptor_payload_size 8
+#define descriptor_payload_size 16
 
 struct Descriptor {
 	enum class Type {
@@ -61,6 +61,7 @@ struct Texture_Descriptor {
 };
 
 struct Constant_Buffer_Descriptor {
+	int offset, size;
 	Buffer_Id buffer;
 };
 
@@ -146,6 +147,8 @@ struct Pipeline {
 					Constant_Buffer_Descriptor* cb =
 						(Constant_Buffer_Descriptor*)b.payload;
 					if (ca->buffer != cb->buffer) return false;
+					if (ca->size != cb->size) return false;
+					if (ca->offset != cb->offset) return false;
 				} break;
 			}
 		}
@@ -254,7 +257,12 @@ struct Pipeline_Builder {
 	void shader(Shader_Id s);
 	void vertex_format(Vertex_Format_Id vf);
 	void texture(int binding, Texture_Id t, Sampler_Id s);
-	void cbuffer(int binding, Buffer_Id id);
+	void cbuffer(
+		int binding,
+		Buffer_Id id,
+		int offset = 0,
+		int size = 0
+	);
 	Pipeline& build();
 	void validate();
 };