From de76354a8423e20331b835642bae204d277afdcd Mon Sep 17 00:00:00 2001
From: luboslenco <lubos.lenco@gmail.com>
Date: Tue, 6 Jan 2026 11:00:19 +0100
Subject: [PATCH] webgpu cube works

---
 base/sources/backends/data/wasm/start.js | 13 ++++++++++++-
 base/sources/backends/webgpu_gpu.c       | 10 ++++------
 base/sources/backends/webgpu_gpu.h       |  1 +
 3 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/base/sources/backends/data/wasm/start.js b/base/sources/backends/data/wasm/start.js
index 5324c9ec..a437f2bc 100644
--- a/base/sources/backends/data/wasm/start.js
+++ b/base/sources/backends/data/wasm/start.js
@@ -5,6 +5,7 @@ let heapu16      = null;
 let heapu32      = null;
 let heapi32      = null;
 let heapf32      = null;
+let heapf64      = null;
 let module       = null;
 let instance     = null;
 let wgpu_objects = [ null ];
@@ -41,6 +42,10 @@ function read_u32(ptr) {
 	return heapu32[ptr / 4];
 }
 
+function read_f64(ptr) {
+	return heapf64[ptr / 8];
+}
+
 function write_string(ptr, str) {
 	for (let i = 0; i < str.length; ++i) {
 		heapu8[ptr + i] = str.charCodeAt(i);
@@ -85,6 +90,7 @@ async function init() {
 	heapu32 = new Uint32Array(memory.buffer);
 	heapi32 = new Int32Array(memory.buffer);
 	heapf32 = new Float32Array(memory.buffer);
+	heapf64 = new Float64Array(memory.buffer);
 
 	if (!navigator.gpu) {
 		throw new Error('WebGPU not supported');
@@ -297,7 +303,12 @@ async function init() {
 				let pcas = read_u32(pdescriptor + 16);
 				for (let i = 0; i < desc.colorAttachmentCount; ++i) {
 					// WGPURenderPassColorAttachment
-					let ca = {view : id_to_ptr(read_u32(pcas + 4 + i * 28)), loadOp : "clear", storeOp : "store", clearValue : [ 0.0, 0.0, 0.0, 0.0 ]};
+					let ca = {
+						view : id_to_ptr(read_u32(pcas + 4 + i * 56)),
+						loadOp : "clear",
+						storeOp : "store",
+						clearValue : [ read_f64(pcas + 24 + i * 56), read_f64(pcas + 32 + i * 56), read_f64(pcas + 40 + i * 56), read_f64(pcas + 48 + i * 56) ]
+					};
 					desc.colorAttachments.push(ca);
 				}
 
diff --git a/base/sources/backends/webgpu_gpu.c b/base/sources/backends/webgpu_gpu.c
index 58548c80..a6ad24b7 100644
--- a/base/sources/backends/webgpu_gpu.c
+++ b/base/sources/backends/webgpu_gpu.c
@@ -491,8 +491,7 @@ static WGPUBindGroup get_descriptor_set(WGPUBuffer buffer) {
 
 void gpu_set_constant_buffer(gpu_buffer_t *buffer, int offset, size_t size) {
 	WGPUBindGroup bind_group = get_descriptor_set(buffer->impl.buf);
-	// uint32_t      offsets[1] = {(uint32_t)offset};
-	uint32_t offsets[1] = {(uint32_t)0};
+	uint32_t      offsets[1] = {(uint32_t)offset};
 	wgpuRenderPassEncoderSetBindGroup(render_pass_encoder, 0, bind_group, 1, offsets);
 	wgpuBindGroupRelease(bind_group);
 }
@@ -744,20 +743,19 @@ void gpu_constant_buffer_init(gpu_buffer_t *buffer, int size) {
 	buffer->count  = size;
 	buffer->stride = 1;
 
-	// WGPUBufferDescriptor desc = {.size = size, .usage = WGPUBufferUsage_Uniform, .mappedAtCreation = true};
-	WGPUBufferDescriptor desc = {.size = size, .usage = WGPUBufferUsage_Uniform, .mappedAtCreation = false};
+	WGPUBufferDescriptor desc = {.size = size, .usage = WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst, .mappedAtCreation = false};
 	buffer->impl.buf          = wgpuDeviceCreateBuffer(device, &desc);
 	buffer->impl.mem          = malloc(buffer->count * buffer->stride);
 }
 
 void gpu_constant_buffer_lock(gpu_buffer_t *buffer, int start, int count) {
-	// buffer->start = start;
+	buffer->impl.start = start;
 	buffer->count = count;
 	buffer->data  = &buffer->impl.mem[start];
 }
 
 void gpu_constant_buffer_unlock(gpu_buffer_t *buffer) {
-	// wgpuBufferUnmap2(buffer->impl.buf, buffer->data, buffer->start, buffer->count);
+	wgpuQueueWriteBuffer(queue, buffer->impl.buf, buffer->impl.start, buffer->data, buffer->count);
 	buffer->data = NULL;
 }
 
diff --git a/base/sources/backends/webgpu_gpu.h b/base/sources/backends/webgpu_gpu.h
index a63aff8e..1d68c3b2 100644
--- a/base/sources/backends/webgpu_gpu.h
+++ b/base/sources/backends/webgpu_gpu.h
@@ -4,6 +4,7 @@
 typedef struct {
 	WGPUBuffer buf;
 	void      *mem;
+	int        start;
 } gpu_buffer_impl_t;
 
 typedef struct {