From 7fa078995b3ed62925788ce2460441bc3d373392 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Thu, 26 Dec 2024 22:06:57 +1100
Subject: constant buffers

---
 c2.cpp | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

(limited to 'c2.cpp')

diff --git a/c2.cpp b/c2.cpp
index 3b46920..052ebf0 100644
--- a/c2.cpp
+++ b/c2.cpp
@@ -5,6 +5,7 @@ extern "C" {
 #include "memory.h"
 }
 #include <string.h>
+#include <math.h>
 
 #define video_arena_size (1024 * 1024 * 16)
 #define asset_arena_size (1024 * 1024 * 4)
@@ -58,6 +59,10 @@ static Sampler_Id create_clamped_linear(Device* dev) {
 	return dev->create_sampler(s);
 }
 
+struct Config_Buffer {
+	float offset[2];
+};
+
 int main() {
 	Arena video_arena;
 	Arena asset_arena;
@@ -66,7 +71,7 @@ int main() {
 	Shader* shader;
 	Texture* texture;
 	Texture* texture2;
-	Buffer_Id vbo;
+	Buffer_Id vbo, cbuf;
 	Sampler_Id clamped_linear;
 	C2* app = App::create<C2>("c2");
 	void* per_frame;
@@ -88,6 +93,11 @@ int main() {
 	shader = (Shader*)assets.load("triangle.csh");
 	texture = (Texture*)assets.load("22.tex");
 	texture2 = (Texture*)assets.load("kita.tex");
+	cbuf = dev->create_buffer(
+		sizeof verts,
+		Buffer_Flags::constant_buffer |
+		Buffer_Flags::cpu_readwrite
+	);
 	per_frame = heap_alloc(
 		dev->heap,
 		per_frame_memory_size
@@ -103,6 +113,15 @@ int main() {
 		app->begin();
 		dev->begin_frame();
 
+		{
+			void* mem;
+			mem = dev->map_buffer(cbuf, 0, sizeof(Config_Buffer));
+			Config_Buffer* c = (Config_Buffer*)mem;
+			c->offset[0] = sinf((float)frame / 10.0f);
+			c->offset[1] = cosf((float)frame / 30.0f);
+			dev->unmap_buffer(cbuf);
+		}
+
 		Pipeline_Builder pb(&frame_arena);
 		pb.begin_rp();
 		pb.rp_target(dev->get_backbuffer(), { r, 0x00, 0xff, 0xff });
@@ -112,10 +131,14 @@ int main() {
 		pb.shader(shader->id);
 		pb.vertex_format(shader->vf);
 		pb.texture(
-			shader->descriptor_index("colour_texture"),
+			shader->descriptor_binding("colour_texture"),
 			frame % 2? texture->id: texture2->id,
 			clamped_linear
 		);
+		pb.cbuffer(
+			shader->descriptor_binding("config_buffer"),
+			cbuf
+		);
 		Pipeline& pip = pb.build();
 
 		Vertex_Buffer_Binding binding[] = {{
@@ -139,6 +162,7 @@ int main() {
 	assets.destroy();
 	dev->destroy_sampler(clamped_linear);
 	dev->destroy_buffer(vbo);
+	dev->destroy_buffer(cbuf);
 	dev->destroy();
 	app->destroy();
 }
-- 
cgit v1.2.3-54-g00ecf