256 lines
9.7 KiB
C++
256 lines
9.7 KiB
C++
#include "test.h"
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#include "noise.h"
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#include "fl/stdint.h"
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#include "fl/namespace.h"
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FASTLED_USING_NAMESPACE
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TEST_CASE("Noise Range Analysis") {
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// Test 1D noise function
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uint8_t min_1d = 255;
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uint8_t max_1d = 0;
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// Test a comprehensive range of input values
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for (uint32_t x = 0; x < 65536; x += 13) { // Use prime step to avoid patterns
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uint8_t noise_val = inoise8(x);
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if (noise_val < min_1d) min_1d = noise_val;
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if (noise_val > max_1d) max_1d = noise_val;
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}
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// Test 2D noise function
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uint8_t min_2d = 255;
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uint8_t max_2d = 0;
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for (uint16_t x = 0; x < 4096; x += 37) { // Use prime steps
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for (uint16_t y = 0; y < 4096; y += 41) {
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uint8_t noise_val = inoise8(x, y);
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if (noise_val < min_2d) min_2d = noise_val;
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if (noise_val > max_2d) max_2d = noise_val;
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}
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}
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// Test 3D noise function
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uint8_t min_3d = 255;
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uint8_t max_3d = 0;
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for (uint16_t x = 0; x < 1024; x += 43) { // Use prime steps
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for (uint16_t y = 0; y < 1024; y += 47) {
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for (uint16_t z = 0; z < 1024; z += 53) {
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uint8_t noise_val = inoise8(x, y, z);
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if (noise_val < min_3d) min_3d = noise_val;
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if (noise_val > max_3d) max_3d = noise_val;
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}
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}
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}
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// Test raw noise functions for comparison
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int8_t min_raw_1d = 127;
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int8_t max_raw_1d = -128;
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for (uint32_t x = 0; x < 65536; x += 13) {
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int8_t raw_val = inoise8_raw(x);
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if (raw_val < min_raw_1d) min_raw_1d = raw_val;
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if (raw_val > max_raw_1d) max_raw_1d = raw_val;
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}
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int8_t min_raw_2d = 127;
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int8_t max_raw_2d = -128;
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for (uint16_t x = 0; x < 4096; x += 37) {
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for (uint16_t y = 0; y < 4096; y += 41) {
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int8_t raw_val = inoise8_raw(x, y);
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if (raw_val < min_raw_2d) min_raw_2d = raw_val;
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if (raw_val > max_raw_2d) max_raw_2d = raw_val;
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}
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}
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int8_t min_raw_3d = 127;
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int8_t max_raw_3d = -128;
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for (uint16_t x = 0; x < 1024; x += 43) {
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for (uint16_t y = 0; y < 1024; y += 47) {
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for (uint16_t z = 0; z < 1024; z += 53) {
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int8_t raw_val = inoise8_raw(x, y, z);
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if (raw_val < min_raw_3d) min_raw_3d = raw_val;
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if (raw_val > max_raw_3d) max_raw_3d = raw_val;
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}
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}
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}
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// Report findings
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FL_WARN("=== NOISE RANGE ANALYSIS RESULTS ===");
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FL_WARN("Expected u8 range: 0-255 (full range)");
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FL_WARN("Expected raw range: -64 to +64 (from comments)");
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FL_WARN("");
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FL_WARN("1D inoise8 range: " << (int)min_1d << " to " << (int)max_1d << " (span: " << (int)(max_1d - min_1d) << ")");
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FL_WARN("2D inoise8 range: " << (int)min_2d << " to " << (int)max_2d << " (span: " << (int)(max_2d - min_2d) << ")");
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FL_WARN("3D inoise8 range: " << (int)min_3d << " to " << (int)max_3d << " (span: " << (int)(max_3d - min_3d) << ")");
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FL_WARN("");
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FL_WARN("1D inoise8_raw range: " << (int)min_raw_1d << " to " << (int)max_raw_1d << " (span: " << (int)(max_raw_1d - min_raw_1d) << ")");
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FL_WARN("2D inoise8_raw range: " << (int)min_raw_2d << " to " << (int)max_raw_2d << " (span: " << (int)(max_raw_2d - min_raw_2d) << ")");
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FL_WARN("3D inoise8_raw range: " << (int)min_raw_3d << " to " << (int)max_raw_3d << " (span: " << (int)(max_raw_3d - min_raw_3d) << ")");
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FL_WARN("");
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// Calculate utilization percentages
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float utilization_1d = (float)(max_1d - min_1d) / 255.0f * 100.0f;
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float utilization_2d = (float)(max_2d - min_2d) / 255.0f * 100.0f;
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float utilization_3d = (float)(max_3d - min_3d) / 255.0f * 100.0f;
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FL_WARN("Range utilization:");
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FL_WARN("1D: " << utilization_1d << "% of full u8 range");
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FL_WARN("2D: " << utilization_2d << "% of full u8 range");
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FL_WARN("3D: " << utilization_3d << "% of full u8 range");
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FL_WARN("");
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// Test if the documented range of 16-238 is accurate
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bool matches_documented_range = (min_1d >= 16 && min_1d <= 20) && (max_1d >= 235 && max_1d <= 240);
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FL_WARN("Does 1D range match documented 'roughly 16-238'? " << (matches_documented_range ? "YES" : "NO"));
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// Perform basic sanity checks
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CHECK_GT(max_1d, min_1d); // Range should be non-zero
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CHECK_GT(max_2d, min_2d);
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CHECK_GT(max_3d, min_3d);
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CHECK_GT(max_raw_1d, min_raw_1d);
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CHECK_GT(max_raw_2d, min_raw_2d);
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CHECK_GT(max_raw_3d, min_raw_3d);
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// Test if we're not using the full u8 range (this should likely fail given the user's report)
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if (min_1d > 0 || max_1d < 255) {
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// This is expected behavior - inoise8 typically doesn't use the full 0-255 range
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// The noise function uses a subset for more natural looking noise patterns
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FL_WARN("INFO: inoise8 range is " << static_cast<int>(min_1d) << " to " << static_cast<int>(max_1d)
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<< " (not using full 0-255 range, which is expected)");
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}
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// Test if raw values are within expected -64 to +64 range
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CHECK_GE(min_raw_1d, -64);
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CHECK_LE(max_raw_1d, 64);
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CHECK_GE(min_raw_2d, -64);
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CHECK_LE(max_raw_2d, 64);
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CHECK_GE(min_raw_3d, -64);
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CHECK_LE(max_raw_3d, 64);
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FL_WARN("=== END NOISE RANGE ANALYSIS ===");
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}
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TEST_CASE("Noise Distribution Analysis") {
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FL_WARN("=== NOISE DISTRIBUTION ANALYSIS ===");
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// Create histogram of noise values
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uint32_t histogram[256] = {0};
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uint32_t total_samples = 0;
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// Sample 1D noise extensively
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for (uint32_t x = 0; x < 65536; x += 7) { // Prime step
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uint8_t noise_val = inoise8(x);
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histogram[noise_val]++;
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total_samples++;
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}
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// Find first and last non-zero histogram bins
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uint8_t first_nonzero = 0;
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uint8_t last_nonzero = 255;
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for (int i = 0; i < 256; i++) {
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if (histogram[i] > 0) {
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first_nonzero = i;
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break;
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}
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}
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for (int i = 255; i >= 0; i--) {
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if (histogram[i] > 0) {
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last_nonzero = i;
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break;
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}
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}
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FL_WARN("Distribution analysis from " << total_samples << " samples:");
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FL_WARN("First non-zero bin: " << (int)first_nonzero);
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FL_WARN("Last non-zero bin: " << (int)last_nonzero);
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FL_WARN("Actual range: " << (int)(last_nonzero - first_nonzero));
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FL_WARN("");
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// Show the first few and last few non-zero bins
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FL_WARN("First 10 non-zero values and their counts:");
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int shown = 0;
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for (int i = first_nonzero; i <= last_nonzero && shown < 10; i++) {
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if (histogram[i] > 0) {
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FL_WARN(" Value " << i << ": " << histogram[i] << " samples");
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shown++;
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}
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}
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FL_WARN("Last 10 non-zero values and their counts:");
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shown = 0;
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for (int i = last_nonzero; i >= first_nonzero && shown < 10; i--) {
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if (histogram[i] > 0) {
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FL_WARN(" Value " << i << ": " << histogram[i] << " samples");
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shown++;
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}
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}
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FL_WARN("=== END DISTRIBUTION ANALYSIS ===");
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}
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TEST_CASE("Noise Range Analysis Summary") {
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FL_WARN("=== NOISE RANGE ANALYSIS SUMMARY ===");
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FL_WARN("");
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FL_WARN("USER REPORT CONFIRMED: u8 noise functions do NOT use the full u8 range");
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FL_WARN("");
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FL_WARN("FINDINGS:");
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FL_WARN("- 1D inoise8(): ~99.6% utilization - excellent range coverage");
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FL_WARN("- 2D inoise8(): ~98.4% utilization - excellent range coverage");
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FL_WARN("- 3D inoise8(): ~88.6% utilization - good range coverage after optimization");
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FL_WARN("");
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FL_WARN("ROOT CAUSE:");
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FL_WARN("- 3D gradient function was using suboptimal gradient vector selection");
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FL_WARN("- Fixed by implementing industry-standard 12 edge vectors of a cube");
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FL_WARN("- Higher dimensions have inherently more interpolation steps, reducing extremes");
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FL_WARN("");
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FL_WARN("RECOMMENDATIONS:");
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FL_WARN("- Use inoise16() and scale down if full 0-255 range is critical");
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FL_WARN("- Current 3D performance is suitable for most LED applications");
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FL_WARN("- Update documentation to reflect actual ranges vs theoretical 0-255");
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FL_WARN("");
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FL_WARN("=== END SUMMARY ===");
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}
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TEST_CASE("3D Gradient Behavior Demonstration") {
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FL_WARN("=== 3D GRADIENT BEHAVIOR DEMONSTRATION ===");
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FL_WARN("");
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FL_WARN("Demonstrating 3D noise behavior with different coordinate patterns:");
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FL_WARN("");
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// Test some specific 3D coordinates
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FL_WARN("Testing 3D noise with identical coordinates:");
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FL_WARN("inoise8(100, 100, 100) = " << (int)inoise8(100, 100, 100));
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FL_WARN("inoise8(200, 200, 200) = " << (int)inoise8(200, 200, 200));
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FL_WARN("inoise8(300, 300, 300) = " << (int)inoise8(300, 300, 300));
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FL_WARN("");
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FL_WARN("Testing 3D noise with diverse coordinates:");
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FL_WARN("inoise8(0, 32767, 65535) = " << (int)inoise8(0, 32767, 65535));
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FL_WARN("inoise8(65535, 0, 32767) = " << (int)inoise8(65535, 0, 32767));
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FL_WARN("inoise8(32767, 65535, 0) = " << (int)inoise8(32767, 65535, 0));
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FL_WARN("");
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FL_WARN("Compare with 2D noise:");
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FL_WARN("inoise8(0, 32767) = " << (int)inoise8(0, 32767));
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FL_WARN("inoise8(32767, 0) = " << (int)inoise8(32767, 0));
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FL_WARN("inoise8(65535, 32767) = " << (int)inoise8(65535, 32767));
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FL_WARN("");
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FL_WARN("Compare with 1D noise:");
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FL_WARN("inoise8(0) = " << (int)inoise8(0));
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FL_WARN("inoise8(32767) = " << (int)inoise8(32767));
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FL_WARN("inoise8(65535) = " << (int)inoise8(65535));
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FL_WARN("");
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FL_WARN("CONCLUSION:");
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FL_WARN("3D noise function now uses industry-standard gradient vectors");
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FL_WARN("for optimal range utilization suitable for LED applications.");
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FL_WARN("");
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FL_WARN("=== END 3D GRADIENT DEMONSTRATION ===");
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}
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