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// This file is part of the 64k demo project.
// It implements reusable test helpers for GPU effect testing.
// Provides pixel validation utilities.
#include "effect_test_helpers.h"
#include <cassert>
// ============================================================================
// Pixel Validation Helpers
// ============================================================================
bool validate_pixels(
const std::vector<uint8_t>& pixels, int width, int height,
std::function<bool(uint8_t r, uint8_t g, uint8_t b, uint8_t a)> predicate) {
const size_t pixel_count = width * height;
for (size_t i = 0; i < pixel_count; ++i) {
const size_t offset = i * 4; // BGRA8 = 4 bytes/pixel
const uint8_t b = pixels[offset + 0];
const uint8_t g = pixels[offset + 1];
const uint8_t r = pixels[offset + 2];
const uint8_t a = pixels[offset + 3];
if (predicate(r, g, b, a)) {
return true; // At least one pixel matches
}
}
return false; // No pixels matched
}
bool has_rendered_content(const std::vector<uint8_t>& pixels, int width,
int height) {
return validate_pixels(pixels, width, height,
[](uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
return r > 0 || g > 0 || b > 0;
});
}
bool all_pixels_match_color(const std::vector<uint8_t>& pixels, int width,
int height, uint8_t target_r, uint8_t target_g,
uint8_t target_b, uint8_t tolerance) {
const size_t pixel_count = width * height;
for (size_t i = 0; i < pixel_count; ++i) {
const size_t offset = i * 4;
const uint8_t b = pixels[offset + 0];
const uint8_t g = pixels[offset + 1];
const uint8_t r = pixels[offset + 2];
const int diff_r = static_cast<int>(r) - static_cast<int>(target_r);
const int diff_g = static_cast<int>(g) - static_cast<int>(target_g);
const int diff_b = static_cast<int>(b) - static_cast<int>(target_b);
if (diff_r * diff_r + diff_g * diff_g + diff_b * diff_b >
tolerance * tolerance) {
return false; // At least one pixel doesn't match
}
}
return true; // All pixels match
}
uint64_t hash_pixels(const std::vector<uint8_t>& pixels) {
// Simple FNV-1a hash
uint64_t hash = 14695981039346656037ULL;
for (const uint8_t byte : pixels) {
hash ^= byte;
hash *= 1099511628211ULL;
}
return hash;
}
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