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// This file is part of the 64k demo project.
// It implements helper functions for post-processing effects.
#include "post_process_helper.h"
#include "demo_effects.h"
#include "gpu/bind_group_builder.h"
#include "gpu/gpu.h"
#include "gpu/pipeline_builder.h"
#include "gpu/sampler_cache.h"
#include "gpu/shader_composer.h"
#include <cstring>
// Helper to create a standard post-processing pipeline
WGPURenderPipeline create_post_process_pipeline(WGPUDevice device,
WGPUTextureFormat format,
const char* shader_code) {
WGPUBindGroupLayout bgl =
BindGroupLayoutBuilder()
.sampler(PP_BINDING_SAMPLER, WGPUShaderStage_Fragment)
.texture(PP_BINDING_TEXTURE, WGPUShaderStage_Fragment)
.uniform(PP_BINDING_UNIFORMS,
WGPUShaderStage_Vertex | WGPUShaderStage_Fragment)
.uniform(PP_BINDING_EFFECT_PARAMS, WGPUShaderStage_Fragment)
.build(device);
const std::string composed_shader =
ShaderComposer::Get().Compose({}, shader_code);
WGPURenderPipeline pipeline = RenderPipelineBuilder(device)
.shader(composed_shader.c_str())
.bind_group_layout(bgl)
.format(format)
.build();
wgpuBindGroupLayoutRelease(bgl);
return pipeline;
}
// --- PostProcess Implementation Helper ---
static GpuBuffer g_dummy_buffer = {nullptr, 0};
void pp_update_bind_group(WGPUDevice device, WGPURenderPipeline pipeline,
WGPUBindGroup* bind_group, WGPUTextureView input_view,
GpuBuffer uniforms, GpuBuffer effect_params) {
if (!g_dummy_buffer.buffer) {
g_dummy_buffer = gpu_create_buffer(device, 32, WGPUBufferUsage_Uniform);
}
if (*bind_group)
wgpuBindGroupRelease(*bind_group);
WGPUBindGroupLayout bgl = wgpuRenderPipelineGetBindGroupLayout(pipeline, 0);
WGPUSampler sampler =
SamplerCache::Get().get_or_create(device, SamplerCache::linear());
*bind_group = BindGroupBuilder()
.sampler(PP_BINDING_SAMPLER, sampler)
.texture(PP_BINDING_TEXTURE, input_view)
.buffer(PP_BINDING_UNIFORMS, uniforms.buffer, uniforms.size)
.buffer(PP_BINDING_EFFECT_PARAMS,
effect_params.buffer ? effect_params.buffer
: g_dummy_buffer.buffer,
effect_params.buffer ? effect_params.size
: g_dummy_buffer.size)
.build(device, bgl);
}
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