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#include "waterfall.h"
#include <cmath>
#include <algorithm>
Waterfall::Waterfall(WGPUDevice device, float x, float y, float width, float height, const std::string& title)
: device_(device), vertexBuffer_(nullptr), x_(x), y_(y), width_(width), height_(height),
title_(title), showGrid_(true) {}
Waterfall::~Waterfall() {
if (vertexBuffer_) wgpuBufferRelease(vertexBuffer_);
}
bool Waterfall::initialize() {
// Create vertex buffer (large enough for grid, border, and waterfall lines)
WGPUBufferDescriptor bufferDesc = {};
bufferDesc.nextInChain = nullptr;
bufferDesc.label = {nullptr, WGPU_STRLEN};
bufferDesc.size = sizeof(Vertex) * POINTS_PER_LINE * 100;
bufferDesc.usage = WGPUBufferUsage_Vertex | WGPUBufferUsage_CopyDst;
bufferDesc.mappedAtCreation = false;
vertexBuffer_ = wgpuDeviceCreateBuffer(device_, &bufferDesc);
return vertexBuffer_ != nullptr;
}
void Waterfall::update(float time) {
// Add new line every 10 frames
if (static_cast<int>(time * 60.0f) % 10 == 0 && lines_.size() < MAX_LINES) {
std::vector<Vertex> line;
float phase = time;
float freq = 2.0f + std::sin(time * 0.5f) * 1.0f;
for (int i = 0; i < POINTS_PER_LINE; ++i) {
float x = (static_cast<float>(i) / POINTS_PER_LINE) * 2.0f - 1.0f;
float y = std::sin(static_cast<float>(i) * 0.1f * freq + phase) * 0.3f;
float hue = std::fmod(time * 0.1f, 1.0f);
Vertex v{
{x, y},
{
std::abs(std::sin(hue * 6.0f)),
std::abs(std::sin((hue + 0.33f) * 6.0f)),
std::abs(std::sin((hue + 0.66f) * 6.0f))
}
};
line.push_back(v);
}
lines_.push_back(line);
}
// Scroll lines down
for (auto& line : lines_) {
for (auto& vertex : line) {
vertex.position[1] -= 0.01f;
}
}
// Remove lines that scrolled off screen
lines_.erase(
std::remove_if(lines_.begin(), lines_.end(),
[](const std::vector<Vertex>& line) {
return !line.empty() && line[0].position[1] < -1.1f;
}),
lines_.end()
);
}
void Waterfall::render(WGPURenderPassEncoder pass,
WGPURenderPipeline linePipeline,
WGPURenderPipeline lineListPipeline,
int windowWidth, int windowHeight) {
// Set viewport
wgpuRenderPassEncoderSetViewport(pass,
x_ * windowWidth,
y_ * windowHeight,
width_ * windowWidth,
height_ * windowHeight,
0.0f, 1.0f
);
// Collect all vertices
std::vector<Vertex> allVertices;
// Border
auto borderVertices = generateBorder();
size_t borderOffset = allVertices.size();
allVertices.insert(allVertices.end(), borderVertices.begin(), borderVertices.end());
// Grid
size_t gridOffset = allVertices.size();
size_t gridCount = 0;
if (showGrid_) {
auto gridVertices = generateGridLines();
gridCount = gridVertices.size();
allVertices.insert(allVertices.end(), gridVertices.begin(), gridVertices.end());
}
// Waterfall lines
size_t linesOffset = allVertices.size();
for (const auto& line : lines_) {
allVertices.insert(allVertices.end(), line.begin(), line.end());
}
// Upload vertices
if (!allVertices.empty()) {
WGPUQueue queue = wgpuDeviceGetQueue(device_);
wgpuQueueWriteBuffer(queue, vertexBuffer_, 0, allVertices.data(),
allVertices.size() * sizeof(Vertex));
}
// Draw border
wgpuRenderPassEncoderSetPipeline(pass, lineListPipeline);
wgpuRenderPassEncoderSetVertexBuffer(pass, 0, vertexBuffer_, 0, allVertices.size() * sizeof(Vertex));
wgpuRenderPassEncoderDraw(pass, borderVertices.size(), 1, borderOffset, 0);
// Draw grid
if (showGrid_ && gridCount > 0) {
wgpuRenderPassEncoderSetPipeline(pass, lineListPipeline);
wgpuRenderPassEncoderDraw(pass, gridCount, 1, gridOffset, 0);
}
// Draw waterfall lines
if (!lines_.empty()) {
wgpuRenderPassEncoderSetPipeline(pass, linePipeline);
for (size_t i = 0; i < lines_.size(); ++i) {
uint32_t start = linesOffset + i * POINTS_PER_LINE;
wgpuRenderPassEncoderDraw(pass, POINTS_PER_LINE, 1, start, 0);
}
}
}
void Waterfall::toggleGrid() {
showGrid_ = !showGrid_;
}
std::vector<Vertex> Waterfall::generateGridLines() {
std::vector<Vertex> vertices;
float gridColor[3] = {0.3f, 0.7f, 0.9f};
// Vertical lines
for (int i = 0; i <= 10; ++i) {
float x = -1.0f + (static_cast<float>(i) / 10.0f) * 2.0f;
vertices.push_back({{x, -1.0f}, {gridColor[0], gridColor[1], gridColor[2]}});
vertices.push_back({{x, 1.0f}, {gridColor[0], gridColor[1], gridColor[2]}});
}
// Horizontal lines
for (int i = 0; i <= 10; ++i) {
float y = -1.0f + (static_cast<float>(i) / 10.0f) * 2.0f;
vertices.push_back({{-1.0f, y}, {gridColor[0], gridColor[1], gridColor[2]}});
vertices.push_back({{1.0f, y}, {gridColor[0], gridColor[1], gridColor[2]}});
}
return vertices;
}
std::vector<Vertex> Waterfall::generateBorder() {
float borderColor[3] = {0.6f, 0.7f, 0.7f};
return {
{{-1.0f, 1.0f}, {borderColor[0], borderColor[1], borderColor[2]}},
{{1.0f, 1.0f}, {borderColor[0], borderColor[1], borderColor[2]}},
{{1.0f, 1.0f}, {borderColor[0], borderColor[1], borderColor[2]}},
{{1.0f, -1.0f}, {borderColor[0], borderColor[1], borderColor[2]}},
{{1.0f, -1.0f}, {borderColor[0], borderColor[1], borderColor[2]}},
{{-1.0f, -1.0f}, {borderColor[0], borderColor[1], borderColor[2]}},
{{-1.0f, -1.0f}, {borderColor[0], borderColor[1], borderColor[2]}},
{{-1.0f, 1.0f}, {borderColor[0], borderColor[1], borderColor[2]}}
};
}
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