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// This file is part of the 64k demo project.
// It implements the MovingEllipseEffect.
#include "gpu/demo_effects.h"
#include "gpu/gpu.h"
// --- MovingEllipseEffect ---
MovingEllipseEffect::MovingEllipseEffect(const GpuContext& ctx)
: Effect(ctx) {
uniforms_ =
gpu_create_buffer(device_, sizeof(float) * 6,
WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
ResourceBinding bindings[] = {{uniforms_, WGPUBufferBindingType_Uniform}};
pass_ =
gpu_create_render_pass(device_, format_, ellipse_shader_wgsl, bindings, 1);
pass_.vertex_count = 3;
}
void MovingEllipseEffect::render(WGPURenderPassEncoder pass, float t, float b,
float i, float a) {
struct {
float t, b, i, a, w, h;
} u = {t, b, i, a, (float)width_, (float)height_};
wgpuQueueWriteBuffer(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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