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matrix: Adds experimental cogl_matrix_{transform,project}_points

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This add two new function that allows us to transform or project an
array of points instead of only transforming one point at a time. Recent
benchmarking has shown cogl_matrix_transform_point to be a bottleneck
sometimes, so this should allow us to reduce the overhead when
transforming lots of vertices at the same time, and also reduce the cost
of 3 component, non-projective transforms.

For now they are marked as experimental (you have to define
COGL_ENABLE_EXPERIMENTAL_API) because there is some concern that it
introduces some inconsistent naming. cogl_matrix_transform_point would
have to be renamed cogl_matrix_project_point to be consistent, but that
would be an API break.
This commit is contained in:
Robert Bragg 2010-11-12 13:35:24 +00:00
parent 56f36cf9c2
commit e9e824fd86
3 changed files with 470 additions and 1 deletions
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346
cogl/cogl-matrix.c
View File

@ -24,6 +24,10 @@
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define USE_MESA_MATRIX_API
#include <cogl.h>
@ -391,4 +395,346 @@ cogl_matrix_transform_point (const CoglMatrix *matrix,
*w = matrix->wx * _x + matrix->wy * _y + matrix->wz * _z + matrix->ww * _w;
}
typedef struct _Point2f
{
float x;
float y;
} Point2f;
typedef struct _Point3f
{
float x;
float y;
float z;
} Point3f;
typedef struct _Point4f
{
float x;
float y;
float z;
float w;
} Point4f;
static void
_cogl_matrix_transform_points_f2_packed (const CoglMatrix *matrix,
void *points_in,
void *points_out,
int n_points)
{
Point2f *p = points_in;
Point3f *o = points_out;
int i;
for (i = 0; i < n_points; i++)
{
o[i].x = matrix->xx * p[i].x + matrix->xy * p[i].y +
matrix->xw;
o[i].y = matrix->yx * p[i].x + matrix->yy * p[i].y +
matrix->yw;
o[i].z = matrix->zx * p[i].x + matrix->zy * p[i].y +
matrix->zw;
}
}
static void
_cogl_matrix_transform_points_f2_strided (const CoglMatrix *matrix,
size_t stride_in,
void *points_in,
size_t stride_out,
void *points_out,
int n_points)
{
int i;
for (i = 0; i < n_points; i++)
{
Point2f *p = (Point2f *)((guint8 *)points_in + i * stride_in);
Point3f *o = (Point3f *)((guint8 *)points_out + i * stride_out);
o->x = matrix->xx * p->x + matrix->xy * p->y + matrix->xw;
o->y = matrix->yx * p->x + matrix->yy * p->y + matrix->yw;
o->z = matrix->zx * p->x + matrix->zy * p->y + matrix->zw;
}
}
static void
_cogl_matrix_project_points_f2_packed (const CoglMatrix *matrix,
void *points_in,
void *points_out,
int n_points)
{
Point2f *p = points_in;
Point4f *o = points_out;
int i;
for (i = 0; i < n_points; i++)
{
o[i].x = matrix->xx * p[i].x + matrix->xy * p[i].y +
matrix->xw;
o[i].y = matrix->yx * p[i].x + matrix->yy * p[i].y +
matrix->yw;
o[i].z = matrix->zx * p[i].x + matrix->zy * p[i].y +
matrix->zw;
o[i].w = matrix->wx * p[i].x + matrix->wy * p[i].y +
matrix->ww;
}
}
static void
_cogl_matrix_project_points_f2_strided (const CoglMatrix *matrix,
size_t stride_in,
void *points_in,
size_t stride_out,
void *points_out,
int n_points)
{
int i;
for (i = 0; i < n_points; i++)
{
Point2f *p = (Point2f *)((guint8 *)points_in + i * stride_in);
Point4f *o = (Point4f *)((guint8 *)points_out + i * stride_out);
o->x = matrix->xx * p->x + matrix->xy * p->y + matrix->xw;
o->y = matrix->yx * p->x + matrix->yy * p->y + matrix->yw;
o->z = matrix->zx * p->x + matrix->zy * p->y + matrix->zw;
o->w = matrix->wx * p->x + matrix->wy * p->y + matrix->ww;
}
}
static void
_cogl_matrix_transform_points_f3_packed (const CoglMatrix *matrix,
void *points_in,
void *points_out,
int n_points)
{
Point3f *p = points_in;
Point3f *o = points_out;
int i;
for (i = 0; i < n_points; i++)
{
o[i].x = matrix->xx * p[i].x + matrix->xy * p[i].y +
matrix->xz * p[i].z + matrix->xw;
o[i].y = matrix->yx * p[i].x + matrix->yy * p[i].y +
matrix->yz * p[i].z + matrix->yw;
o[i].z = matrix->zx * p[i].x + matrix->zy * p[i].y +
matrix->zz * p[i].z + matrix->zw;
}
}
static void
_cogl_matrix_transform_points_f3_strided (const CoglMatrix *matrix,
size_t stride_in,
void *points_in,
size_t stride_out,
void *points_out,
int n_points)
{
int i;
for (i = 0; i < n_points; i++)
{
Point3f *p = (Point3f *)((guint8 *)points_in + i * stride_in);
Point3f *o = (Point3f *)((guint8 *)points_out + i * stride_out);
o->x = matrix->xx * p->x + matrix->xy * p->y +
matrix->xz * p->z + matrix->xw;
o->y = matrix->yx * p->x + matrix->yy * p->y +
matrix->yz * p->z + matrix->yw;
o->z = matrix->zx * p->x + matrix->zy * p->y +
matrix->zz * p->z + matrix->zw;
}
}
static void
_cogl_matrix_project_points_f3_packed (const CoglMatrix *matrix,
void *points_in,
void *points_out,
int n_points)
{
Point3f *p = points_in;
Point4f *o = points_out;
int i;
for (i = 0; i < n_points; i++)
{
o[i].x = matrix->xx * p[i].x + matrix->xy * p[i].y +
matrix->xz * p[i].z + matrix->xw;
o[i].y = matrix->yx * p[i].x + matrix->yy * p[i].y +
matrix->yz * p[i].z + matrix->yw;
o[i].z = matrix->zx * p[i].x + matrix->zy * p[i].y +
matrix->zz * p[i].z + matrix->zw;
o[i].w = matrix->wx * p[i].x + matrix->wy * p[i].y +
matrix->wz * p[i].z + matrix->ww;
}
}
static void
_cogl_matrix_project_points_f3_strided (const CoglMatrix *matrix,
size_t stride_in,
void *points_in,
size_t stride_out,
void *points_out,
int n_points)
{
int i;
for (i = 0; i < n_points; i++)
{
Point3f *p = (Point3f *)((guint8 *)points_in + i * stride_in);
Point4f *o = (Point4f *)((guint8 *)points_out + i * stride_out);
o->x = matrix->xx * p->x + matrix->xy * p->y +
matrix->xz * p->z + matrix->xw;
o->y = matrix->yx * p->x + matrix->yy * p->y +
matrix->yz * p->z + matrix->yw;
o->z = matrix->zx * p->x + matrix->zy * p->y +
matrix->zz * p->z + matrix->zw;
o->w = matrix->wx * p->x + matrix->wy * p->y +
matrix->wz * p->z + matrix->ww;
}
}
static void
_cogl_matrix_project_points_f4_packed (const CoglMatrix *matrix,
void *points_in,
void *points_out,
int n_points)
{
Point4f *p = points_in;
Point4f *o = points_out;
int i;
for (i = 0; i < n_points; i++)
{
o[i].x = matrix->xx * p[i].x + matrix->xy * p[i].y +
matrix->xz * p[i].z + matrix->xw * p[i].w;
o[i].y = matrix->yx * p[i].x + matrix->yy * p[i].y +
matrix->yz * p[i].z + matrix->yw * p[i].w;
o[i].z = matrix->zx * p[i].x + matrix->zy * p[i].y +
matrix->zz * p[i].z + matrix->zw * p[i].w;
o[i].w = matrix->wx * p[i].x + matrix->wy * p[i].y +
matrix->wz * p[i].z + matrix->ww * p[i].w;
}
}
static void
_cogl_matrix_project_points_f4_strided (const CoglMatrix *matrix,
size_t stride_in,
void *points_in,
size_t stride_out,
void *points_out,
int n_points)
{
int i;
for (i = 0; i < n_points; i++)
{
Point4f *p = (Point4f *)((guint8 *)points_in + i * stride_in);
Point4f *o = (Point4f *)((guint8 *)points_out + i * stride_out);
o->x = matrix->xx * p->x + matrix->xy * p->y +
matrix->xz * p->z + matrix->xw * p->w;
o->y = matrix->yx * p->x + matrix->yy * p->y +
matrix->yz * p->z + matrix->yw * p->w;
o->z = matrix->zx * p->x + matrix->zy * p->y +
matrix->zz * p->z + matrix->zw * p->w;
o->w = matrix->wx * p->x + matrix->wy * p->y +
matrix->wz * p->z + matrix->ww * p->w;
}
}
void
cogl_matrix_transform_points (const CoglMatrix *matrix,
int n_components,
size_t stride_in,
void *points_in,
size_t stride_out,
void *points_out,
int n_points)
{
/* The results of transforming always have three components... */
g_return_if_fail (stride_out >= sizeof (Point3f));
if (n_components == 2)
{
if (stride_in == sizeof (Point2f) &&
stride_out == sizeof (Point3f))
_cogl_matrix_transform_points_f2_packed (matrix,
points_in, points_out,
n_points);
else
_cogl_matrix_transform_points_f2_strided (matrix,
stride_in, points_in,
stride_out, points_out,
n_points);
}
else
{
g_return_if_fail (n_components == 3);
if (stride_in == sizeof (Point3f) && stride_out == stride_in)
_cogl_matrix_transform_points_f3_packed (matrix,
points_in, points_out,
n_points);
else
_cogl_matrix_transform_points_f3_strided (matrix,
stride_in, points_in,
stride_out, points_out,
n_points);
}
}
void
cogl_matrix_project_points (const CoglMatrix *matrix,
int n_components,
size_t stride_in,
void *points_in,
size_t stride_out,
void *points_out,
int n_points)
{
if (n_components == 2)
{
if (stride_in == sizeof (Point2f) &&
stride_out == sizeof (Point4f))
_cogl_matrix_project_points_f2_packed (matrix,
points_in, points_out,
n_points);
else
_cogl_matrix_project_points_f2_strided (matrix,
stride_in, points_in,
stride_out, points_out,
n_points);
}
else if (n_components == 3)
{
if (stride_in == sizeof (Point3f) &&
stride_out == sizeof (Point4f))
_cogl_matrix_project_points_f3_packed (matrix,
points_in, points_out,
n_points);
else
_cogl_matrix_project_points_f3_strided (matrix,
stride_in, points_in,
stride_out, points_out,
n_points);
}
else
{
g_return_if_fail (n_components == 4);
if (stride_in == sizeof (Point4f) && stride_out == stride_in)
_cogl_matrix_project_points_f4_packed (matrix,
points_in, points_out,
n_points);
else
_cogl_matrix_project_points_f4_strided (matrix,
stride_in, points_in,
stride_out, points_out,
n_points);
}
}

123
cogl/cogl-matrix.h
View File

@ -316,6 +316,10 @@ gboolean
cogl_matrix_get_inverse (const CoglMatrix *matrix,
CoglMatrix *inverse);
/* FIXME: to be consistent with cogl_matrix_{transform,project}_points
* this could be renamed to cogl_matrix_project_point for Cogl 2.0...
*/
/**
* cogl_matrix_transform_point:
* @matrix: A 4x4 transformation matrix
@ -334,6 +338,125 @@ cogl_matrix_transform_point (const CoglMatrix *matrix,
float *z,
float *w);
#ifdef COGL_ENABLE_EXPERIMENTAL_API
#define cogl_matrix_transform_points cogl_matrix_transform_points_EXP
#define cogl_matrix_project_points cogl_matrix_project_points_EXP
/**
* cogl_matrix_transform_points:
* @matrix: A transformation matrix
* @n_components: The number of position components for each input point.
* (either 2 or 3)
* @stride_in: The stride in bytes between input points.
* @points_in: A pointer to the first component of the first input point.
* @stride_out: The stride in bytes between output points.
* @points_out: A pointer to the first component of the first output point.
* @n_points: The number of points to transform.
*
* Transforms an array of input points and writes the result to
* another array of output points. The input points can either have 2
* or 3 components each. The output points always have 3 components.
* The output array can simply point to the input array to do the
* transform in-place.
*
* If you need to transform 4 component points see
* cogl_matrix_project_points().
*
* Here's an example with differing input/output strides:
* |[
* typedef struct {
* float x,y;
* guint8 r,g,b,a;
* float s,t,p;
* } MyInVertex;
* typedef struct {
* guint8 r,g,b,a;
* float x,y,z;
* } MyOutVertex;
* MyInVertex vertices[N_VERTICES];
* MyOutVertex results[N_VERTICES];
* CoglMatrix matrix;
*
* my_load_vertices (vertices);
* my_get_matrix (&matrix);
*
* cogl_matrix_transform_points (&matrix,
* 2,
* sizeof (MyInVertex),
* &vertices[0].x,
* sizeof (MyOutVertex),
* &results[0].x,
* N_VERTICES);
* ]|
*
* Stability: Unstable
*/
void
cogl_matrix_transform_points (const CoglMatrix *matrix,
int n_components,
size_t stride_in,
void *points_in,
size_t stride_out,
void *points_out,
int n_points);
/**
* cogl_matrix_project_points:
* @matrix: A projection matrix
* @n_components: The number of position components for each input point.
* (either 2, 3 or 4)
* @stride_in: The stride in bytes between input points.
* @points_in: A pointer to the first component of the first input point.
* @stride_out: The stride in bytes between output points.
* @points_out: A pointer to the first component of the first output point.
* @n_points: The number of points to transform.
*
* Projects an array of input points and writes the result to another
* array of output points. The input points can either have 2, 3 or 4
* components each. The output points always have 4 components (known
* as homogenous coordinates). The output array can simply point to
* the input array to do the transform in-place.
*
* Here's an example with differing input/output strides:
* |[
* typedef struct {
* float x,y;
* guint8 r,g,b,a;
* float s,t,p;
* } MyInVertex;
* typedef struct {
* guint8 r,g,b,a;
* float x,y,z;
* } MyOutVertex;
* MyInVertex vertices[N_VERTICES];
* MyOutVertex results[N_VERTICES];
* CoglMatrix matrix;
*
* my_load_vertices (vertices);
* my_get_matrix (&matrix);
*
* cogl_matrix_project_points (&matrix,
* 2,
* sizeof (MyInVertex),
* &vertices[0].x,
* sizeof (MyOutVertex),
* &results[0].x,
* N_VERTICES);
* ]|
*
* Stability: Unstable
*/
void
cogl_matrix_project_points (const CoglMatrix *matrix,
int n_components,
size_t stride_in,
void *points_in,
size_t stride_out,
void *points_out,
int n_points);
#endif /* COGL_ENABLE_EXPERIMENTAL_API */
G_END_DECLS
#endif /* __COGL_MATRIX_H */

2
doc/reference/cogl/cogl-sections.txt
View File

@ -436,7 +436,6 @@ cogl_matrix_init_identity
cogl_matrix_frustum
cogl_matrix_ortho
cogl_matrix_perspective
cogl_matrix_transform_point
cogl_matrix_multiply
cogl_matrix_rotate
cogl_matrix_translate
@ -444,6 +443,7 @@ cogl_matrix_scale
cogl_matrix_init_from_array
cogl_matrix_get_array
cogl_matrix_get_inverse
cogl_matrix_transform_point
</SECTION>
<SECTION>