69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
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#include "surface.hpp"
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#include "polygon.hpp"
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#include "main.hpp"
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/*******************************************************************************
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** SurfaceCreate
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*******************************************************************************/
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void
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SurfaceCreate(Surface* surface, Vector poly[], int n, int colour, float angle, float z)
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{
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Vector up = {0.0f, 1.0f, 0.0f};
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Matrix reverse;
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Vector lo, hi;
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Vector* tmp = (Vector*) malloc(n * sizeof(Vector));
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ThrowIf(!tmp, "Could not allocate temporary surface memory");
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memset(surface, 0, sizeof(Surface));
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surface->colour = colour;
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TrianglePlane(poly, surface->plane);
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/*
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** Calculate surface matrix.
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*/
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MatrixView (surface->matrix, surface->plane, up, angle);
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VectorNegate(surface->matrix[0], surface->matrix[0]);
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VectorNegate(surface->matrix[1], surface->matrix[1]);
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/*
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** Transform polygon into surface space and calculate surface extents.
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*/
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PolygonTransform(tmp, poly, n, surface->matrix);
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PolygonExtent(lo, hi, tmp, n);
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/*
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** Snap polygon extents to lightmap grid.
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*/
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surface->lo[0] = (float)floor(lo[0] / 16.0f) * 16.0f;
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surface->lo[1] = (float)floor(lo[1] / 16.0f) * 16.0f;
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surface->lo[2] = lo[2];
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surface->hi[0] = (float)ceil (hi[0] / 16.0f) * 16.0f;
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surface->hi[1] = (float)ceil (hi[1] / 16.0f) * 16.0f;
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surface->hi[2] = hi[2];
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/*
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** Calculate surfaces width & height.
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*/
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surface->width = (int)surface->hi[0] - (int)surface->lo[0];
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surface->height = (int)surface->hi[1] - (int)surface->lo[1];
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ThrowIf(surface->width <= 0, "Zero width surface");
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ThrowIf(surface->height <= 0, "Zero height surface");
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/*
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** Calculate surfaces PMN vectors.
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*/
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VectorCreate(surface->PMN[0], surface->lo[0], surface->lo[1], surface->lo[2] + z);
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VectorCreate(surface->PMN[1], surface->hi[0] - surface->lo[0], 0.0f, 0.0f);
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VectorCreate(surface->PMN[2], 0.0f, surface->hi[1] - surface->lo[1], 0.0f);
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/*
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** Transform PMN vectors back into world space.
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*/
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MatrixTranspose(reverse, surface->matrix);
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TriangleTransform(surface->PMN, surface->PMN, reverse);
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free(tmp);
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}
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