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Add vec3Xmat4

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This commit is contained in:
Miloslav Číž 2019-05-16 23:42:12 +02:00
parent e97ea1c5cc
commit e31a837e57
1 changed files with 29 additions and 9 deletions
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38
s3l.h
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@ -323,7 +323,7 @@ typedef S3L_Unit S3L_Mat4[4][4]; /**< 4x4 matrix, used mostly for 3D
transforms. The indexing is this:
matrix[column][row]. */
#define S3L_writeMat4(m)\
printfi"Mat4:\n %d %d %d %d\n %d %d %d %d\n %d %d %d %d\n %d %d %d %d\n"\
printf("Mat4:\n %d %d %d %d\n %d %d %d %d\n %d %d %d %d\n %d %d %d %d\n"\
,(m)[0][0],(m)[1][0],(m)[2][0],(m)[3][0],\
(m)[0][1],(m)[1][1],(m)[2][1],(m)[3][1],\
(m)[0][2],(m)[1][2],(m)[2][2],(m)[3][2],\
@ -350,7 +350,6 @@ static inline void S3L_initMat4(S3L_Mat4 *m)
Multiplies a vector by a matrix with normalization by S3L_FRACTIONS_PER_UNIT.
Result is stored in the input vector.
*/
void S3L_vec4Xmat4(S3L_Vec4 *v, S3L_Mat4 *m)
{
S3L_Vec4 vBackup;
@ -362,20 +361,40 @@ void S3L_vec4Xmat4(S3L_Vec4 *v, S3L_Mat4 *m)
// TODO: try alternative operation orders to optimize
#define dot(col)\
#define dotCol(col)\
(vBackup.x * (*m)[col][0]) / S3L_FRACTIONS_PER_UNIT +\
(vBackup.y * (*m)[col][1]) / S3L_FRACTIONS_PER_UNIT +\
(vBackup.z * (*m)[col][2]) / S3L_FRACTIONS_PER_UNIT +\
(vBackup.w * (*m)[col][3]) / S3L_FRACTIONS_PER_UNIT
v->x = dot(0);
v->y = dot(1);
v->z = dot(2);
v->w = dot(3);
v->x = dotCol(0);
v->y = dotCol(1);
v->z = dotCol(2);
v->w = dotCol(3);
#undef dot
}
/**
Same as S3L_vec4Xmat4 but faster, because this version doesn't compute the W
component of the result, which is usually not needed.
*/
void S3L_vec3Xmat4(S3L_Vec4 *v, S3L_Mat4 *m)
{
S3L_Vec4 vBackup;
vBackup.x = v->x;
vBackup.y = v->y;
vBackup.z = v->z;
vBackup.w = v->w;
v->x = dotCol(0);
v->y = dotCol(1);
v->z = dotCol(2);
v->w = S3L_FRACTIONS_PER_UNIT;
}
#undef dotCol
// general helper functions
static inline S3L_Unit S3L_abs(S3L_Unit value)
@ -1389,6 +1408,7 @@ void S3L_drawModelIndexed(
S3L_makeWorldMatrix(modelTransform,&mat1);
S3L_makeCameraMatrix(camera->transform,&mat2);
S3L_mat4Xmat4(&mat1,&mat2);
while (triangleIndex < triangleCount)
@ -1401,7 +1421,7 @@ void S3L_drawModelIndexed(
++indexIndex;\
pointModel.z = coords[indexIndex];\
++coordIndex;\
S3L_vec4Xmat4(&pointModel,&mat1);\
S3L_vec3Xmat4(&pointModel,&mat1);\
transformed##n.x = pointModel.x;\
transformed##n.y = pointModel.y;\
transformed##n.z = pointModel.z;\