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Reduce Z-fighting for decal surfaces

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This commit is contained in:
Sean Maas 2021-02-24 23:37:43 -05:00
parent 2bbb6bb08c
commit 5dd241c57d
1 changed files with 39 additions and 4 deletions
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43
src/nds/nds_renderer.c
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@ -179,10 +179,45 @@ static void draw_vertices(const struct Vertex **v, int count) {
}
// Send the vertices to the 3D engine
for (int i = 0; i < count; i++) {
if (use_color) glColor3b(v[i]->color.r, v[i]->color.g, v[i]->color.b);
if (use_texture) glTexCoord2t16(v[i]->s, v[i]->t);
glVertex3v16(v[i]->x, v[i]->y, v[i]->z);
if ((other_mode_l & ZMODE_DEC) == ZMODE_DEC) {
for (int i = 0; i < count; i++) {
// Send the vertex attributes to the 3D engine
if (use_color) glColor3b(v[i]->color.r, v[i]->color.g, v[i]->color.b);
if (use_texture) glTexCoord2t16(v[i]->s, v[i]->t);
// Use position test to project the vertex so the result can be hijacked before sending it for real
PosTest(v[i]->x, v[i]->y, v[i]->z);
// Push the current matrices to the stack, and load an identity matrix so the outgoing vertex won't be affected
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
// Reduce the Z value for decal mode to reduce Z-fighting
// Since the W value can't be set directly, use a scaling matrix with a vertex of 1s to send the coordinates
const m4x4 vertex = {{
PosTestXresult(), 0, 0, 0,
0, PosTestYresult(), 0, 0,
0, 0, PosTestZresult() - 3, 0,
0, 0, 0, PosTestWresult()
}};
glLoadMatrix4x4(&vertex);
glVertex3v16(1 << 12, 1 << 12, 1 << 12);
// Restore the original matrices
glPopMatrix(1);
glMatrixMode(GL_MODELVIEW);
glPopMatrix(1);
}
} else {
// Send the vertices normally
for (int i = 0; i < count; i++) {
if (use_color) glColor3b(v[i]->color.r, v[i]->color.g, v[i]->color.b);
if (use_texture) glTexCoord2t16(v[i]->s, v[i]->t);
glVertex3v16(v[i]->x, v[i]->y, v[i]->z);
}
}
// As part of the depth hack, move the hijacked Z value to the front once normal polygons start being sent