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/*
* Descent 3
* Copyright (C) 2024 Parallax Software
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "3d.h"
#include "pserror.h"
#include "HardwareInternal.h"
#include "renderer.h"
#include <string.h>
// Whether or not to use T&L transforms or the pass-thru ones
static int sUseTransformPassthru = -1;
extern float Z_bias;
void g3_GetModelViewMatrix(const vector *viewPos, const matrix *viewMatrix, float *mvMat) {
matrix localOrient = (*viewMatrix);
vector localPos = -(*viewPos);
mvMat[0] = localOrient.rvec.x;
mvMat[1] = localOrient.uvec.x;
mvMat[2] = localOrient.fvec.x;
mvMat[3] = 0.0f;
mvMat[4] = localOrient.rvec.y;
mvMat[5] = localOrient.uvec.y;
mvMat[6] = localOrient.fvec.y;
mvMat[7] = 0.0f;
mvMat[8] = localOrient.rvec.z;
mvMat[9] = localOrient.uvec.z;
mvMat[10] = localOrient.fvec.z;
mvMat[11] = 0.0f;
mvMat[12] = localPos * localOrient.rvec;
mvMat[13] = localPos * localOrient.uvec;
mvMat[14] = localPos * localOrient.fvec + Z_bias;
mvMat[15] = 1.0f;
}
void g3_TransformVert(float res[4], float pt[4], float a[4][4]) {
int y;
for (y = 0; y < 4; ++y) {
res[y] = (pt[0] * a[0][y]) + (pt[1] * a[1][y]) + (pt[2] * a[2][y]) + (pt[3] * a[3][y]);
}
}
void g3_TransformMult(float res[4][4], float a[4][4], float b[4][4]) {
float temp[4][4];
int x, y;
for (y = 0; y < 4; ++y) {
for (x = 0; x < 4; ++x) {
temp[y][x] = (a[y][0] * b[0][x]) + (a[y][1] * b[1][x]) + (a[y][2] * b[2][x]) + (a[y][3] * b[3][x]);
}
}
memcpy(res, temp, 16 * sizeof(float));
}
void g3_TransformTrans(float res[4][4], float t[4][4]) {
float temp[4][4];
int y;
for (y = 0; y < 4; ++y) {
int x;
for (x = 0; x < 4; ++x) {
temp[x][y] = t[y][x];
}
}
memcpy(res, temp, 16 * sizeof(float));
}
void g3_UpdateFullTransform() {
// ModelView -> projection
g3_TransformMult(gTransformFull, gTransformModelView, gTransformProjection);
// projection -> ViewPort
g3_TransformMult(gTransformFull, gTransformFull, gTransformViewPort);
}
void g3_ForceTransformRefresh(void) { sUseTransformPassthru = -1; }
void g3_RefreshTransforms(bool usePassthru) {
if (sUseTransformPassthru == 1 && usePassthru) {
// we don't have to do anything because we are already setup for pass-thru
return;
}
if (usePassthru) {
// setup OpenGL to use pass-thru
rend_TransformSetToPassthru();
} else {
// extract the viewport data from the renderer
int viewportWidth, viewportHeight, viewportX, viewportY;
rend_GetProjectionScreenParameters(viewportX, viewportY, viewportWidth, viewportHeight);
// setup OpenGL to use full transform stack
// TODO: in the future we only need to set those that have changed
rend_TransformSetViewport(viewportX, viewportY, viewportWidth, viewportHeight);
rend_TransformSetProjection(gTransformProjection);
rend_TransformSetModelView(gTransformModelView);
}
// store the pass-thru
sUseTransformPassthru = (usePassthru) ? 1 : 0;
}
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