72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
#include "Contents/GroundGeometry.h"
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#include "Resource/TerrainResource.h"
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#include <bit>
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#include <emmintrin.h>
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// OFFSET: 0x00ABFB10
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// FUNCTION: fn_17558
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void GroundGeometry::InitializeLighting(const C3dAttr& terrain) {
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// The original opens with a virtual slot 10 predicate (vtable 0x011591F8 -> 0x00AC1520,
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// 0x00AC1520 = "mov al, 1; retn"), so its early return is unreachable for this class and
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// no dispatch is modeled here. The terrain grid lives at original +0x4, before this view,
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// which is why it arrives as a borrowed parameter instead of a member.
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// STATIC: 0x01348128; center, north, south, east, west in that order.
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constexpr int offsets[5][2] = {{0, 0}, {0, -1}, {0, 1}, {1, 0}, {-1, 0}};
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const int columns = std::bit_cast<int>(2u * static_cast<unsigned>(this->width));
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const int rows = std::bit_cast<int>(2u * static_cast<unsigned>(this->height));
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for (int row = 0; row < rows; ++row) {
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for (int column = 0; column < columns; ++column) {
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float average = 0.0f;
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const TerrainHeightCell* cell = terrain.Grid().CellAt(column, row);
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if (cell) {
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average = ((cell->heights[1] + cell->heights[0]) + cell->heights[2] + cell->heights[3]) * 0.25f;
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}
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float minimum;
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float maximum;
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this->CellBounds(column / 2, row / 2, minimum, maximum);
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float red = 1.0f;
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float green = 1.0f;
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float blue = 1.0f;
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// COMISS/JB excludes unordered averages, unlike an inverted < predicate.
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if (average >= minimum - 2.5f) {
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unsigned sums[4]{};
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for (const auto& offset : offsets) {
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unsigned char alpha;
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unsigned char sampleRed;
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unsigned char sampleGreen;
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unsigned char sampleBlue;
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this->LightmapSample(column + offset[0], row + offset[1], alpha, sampleRed, sampleGreen, sampleBlue);
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sums[0] += alpha;
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sums[1] += sampleRed;
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sums[2] += sampleGreen;
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sums[3] += sampleBlue;
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}
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const float alpha = (static_cast<float>(sums[0]) / 5.0f) / 255.0f;
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red = ((static_cast<float>(sums[1]) / 5.0f) * 0.0078125f) + alpha;
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green = ((static_cast<float>(sums[2]) / 5.0f) * 0.0078125f) + alpha;
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blue = ((static_cast<float>(sums[3]) / 5.0f) * 0.0078125f) + alpha;
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const float first = _mm_cvtss_f32(_mm_max_ss(_mm_set_ss(green), _mm_set_ss(red)));
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const float largest = _mm_cvtss_f32(_mm_max_ss(_mm_set_ss(blue), _mm_set_ss(first)));
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if (largest > 1.0f) {
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red = red / largest;
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green = green / largest;
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blue = blue / largest;
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}
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}
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if (!this->lighting.empty()) {
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const auto index =
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static_cast<unsigned>(column) + 2u * static_cast<unsigned>(row) * static_cast<unsigned>(this->width);
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this->lighting[index] = {red, green, blue};
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}
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}
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}
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}
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