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Try to avoid depth precision problems with faraway objects with higher FOV on direct3d9

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UnknownShadow200 2021-01-23 20:27:57 +11:00
parent 4b734ffe7c
commit e66649b285
1 changed files with 8 additions and 3 deletions
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11
src/Graphics.c
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@ -973,13 +973,18 @@ void Gfx_CalcOrthoMatrix(float width, float height, struct Matrix* matrix) {
matrix->row4.Z = ORTHO_NEAR / (ORTHO_NEAR - ORTHO_FAR); matrix->row4.Z = ORTHO_NEAR / (ORTHO_NEAR - ORTHO_FAR);
} }
void Gfx_CalcPerspectiveMatrix(float fov, float aspect, float zFar, struct Matrix* matrix) { static float CalcZNear(float fov) {
/* With reversed z depth, near Z plane can be much closer (with sufficient depth buffer precision) */ /* With reversed z depth, near Z plane can be much closer (with sufficient depth buffer precision) */
/* This reduces clipping with high FOV without sacrificing depth precision for faraway objects */ /* This reduces clipping with high FOV without sacrificing depth precision for faraway objects */
/* However for low FOV, don't reduce near Z in order to gain a bit more depth precision */ /* However for low FOV, don't reduce near Z in order to gain a bit more depth precision */
float zNear = (depthBits < 24 || fov <= 70 * MATH_DEG2RAD) ? 0.05f : 0.001953125f; if (depthBits < 24 || fov <= 70 * MATH_DEG2RAD) return 0.05f;
Matrix_PerspectiveFieldOfView(matrix, fov, aspect, zNear, zFar); if (fov <= 100 * MATH_DEG2RAD) return 0.025f;
if (fov <= 150 * MATH_DEG2RAD) return 0.0125f;
return 0.00390625f;
}
void Gfx_CalcPerspectiveMatrix(float fov, float aspect, float zFar, struct Matrix* matrix) {
Matrix_PerspectiveFieldOfView(matrix, fov, aspect, CalcZNear(fov), zFar);
/* Adjust the projection matrix to produce reversed Z values */ /* Adjust the projection matrix to produce reversed Z values */
matrix->row3.Z = -matrix->row3.Z - 1.0f; matrix->row3.Z = -matrix->row3.Z - 1.0f;
matrix->row4.Z = -matrix->row4.Z; matrix->row4.Z = -matrix->row4.Z;