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// This file is part of the 64k demo project.
// It implements the MovingEllipseEffect.
#include "gpu/demo_effects.h"
#include "gpu/effects/post_process_helper.h"
#include "gpu/gpu.h"
// --- MovingEllipseEffect ---
MovingEllipseEffect::MovingEllipseEffect(const GpuContext& ctx) : Effect(ctx) {
uniforms_ =
gpu_create_buffer(ctx_.device, sizeof(CommonPostProcessUniforms),
WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
ResourceBinding bindings[] = {{uniforms_, WGPUBufferBindingType_Uniform}};
pass_ = gpu_create_render_pass(ctx_.device, ctx_.format, ellipse_shader_wgsl,
bindings, 1);
pass_.vertex_count = 3;
}
void MovingEllipseEffect::render(WGPURenderPassEncoder pass, float t, float b,
float i, float a) {
const CommonPostProcessUniforms u = {
.resolution = {(float)width_, (float)height_},
.aspect_ratio = a,
.time = t,
.beat = b,
.audio_intensity = i,
};
wgpuQueueWriteBuffer(ctx_.queue, uniforms_.buffer, 0, &u, sizeof(u));
wgpuRenderPassEncoderSetPipeline(pass, pass_.pipeline);
wgpuRenderPassEncoderSetBindGroup(pass, 0, pass_.bind_group, 0, nullptr);
wgpuRenderPassEncoderDraw(pass, 3, 1, 0, 0);
}
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