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// This file is part of the 64k demo project.
// It implements the TextureManager.
#include "gpu/texture_manager.h"
#include <iostream>
#include <vector>
#if defined(DEMO_CROSS_COMPILE_WIN32)
// Old API
#define WGPU_TEX_COPY_INFO WGPUImageCopyTexture
#define WGPU_TEX_DATA_LAYOUT WGPUTextureDataLayout
#else
// New API
#define WGPU_TEX_COPY_INFO WGPUTexelCopyTextureInfo
#define WGPU_TEX_DATA_LAYOUT WGPUTexelCopyBufferLayout
#endif
void TextureManager::init(WGPUDevice device, WGPUQueue queue) {
device_ = device;
queue_ = queue;
}
void TextureManager::shutdown() {
for (auto& pair : textures_) {
wgpuTextureViewRelease(pair.second.view);
wgpuTextureRelease(pair.second.texture);
}
textures_.clear();
}
void TextureManager::create_procedural_texture(
const std::string& name, const ProceduralTextureDef& def) {
// 1. Generate Data on CPU
std::vector<uint8_t> pixel_data;
pixel_data.resize(def.width * def.height * 4);
def.gen_func(pixel_data.data(), def.width, def.height, def.params.data(),
(int)def.params.size());
WGPUExtent3D tex_size = {(uint32_t)def.width, (uint32_t)def.height, 1};
// 2. Create GPU Texture
WGPUTextureDescriptor tex_desc = {};
tex_desc.usage =
WGPUTextureUsage_TextureBinding | WGPUTextureUsage_CopyDst;
tex_desc.dimension = WGPUTextureDimension_2D;
tex_desc.size = tex_size;
tex_desc.format = WGPUTextureFormat_RGBA8Unorm;
tex_desc.mipLevelCount = 1;
tex_desc.sampleCount = 1;
#if defined(DEMO_CROSS_COMPILE_WIN32)
tex_desc.label = nullptr;
#else
tex_desc.label = {nullptr, 0};
#endif
WGPUTexture texture = wgpuDeviceCreateTexture(device_, &tex_desc);
// 3. Upload Data
WGPU_TEX_COPY_INFO destination = {};
destination.texture = texture;
destination.mipLevel = 0;
destination.origin = {0, 0, 0};
destination.aspect = WGPUTextureAspect_All;
WGPU_TEX_DATA_LAYOUT source_layout = {};
source_layout.offset = 0;
source_layout.bytesPerRow = def.width * 4;
source_layout.rowsPerImage = def.height;
wgpuQueueWriteTexture(queue_, &destination, pixel_data.data(),
pixel_data.size(), &source_layout, &tex_size);
// 4. Create View
WGPUTextureViewDescriptor view_desc = {};
view_desc.format = WGPUTextureFormat_RGBA8Unorm;
view_desc.dimension = WGPUTextureViewDimension_2D;
view_desc.baseMipLevel = 0;
view_desc.mipLevelCount = 1;
view_desc.baseArrayLayer = 0;
view_desc.arrayLayerCount = 1;
view_desc.aspect = WGPUTextureAspect_All;
WGPUTextureView view = wgpuTextureCreateView(texture, &view_desc);
// 5. Store
GpuTexture gpu_tex;
gpu_tex.texture = texture;
gpu_tex.view = view;
gpu_tex.width = def.width;
gpu_tex.height = def.height;
textures_[name] = gpu_tex;
#if !defined(STRIP_ALL)
std::cout << "Generated procedural texture: " << name << " (" << def.width
<< "x" << def.height << ")" << std::endl;
#endif
}
WGPUTextureView TextureManager::get_texture_view(const std::string& name) {
auto it = textures_.find(name);
if (it != textures_.end()) {
return it->second.view;
}
return nullptr;
}
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