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util: optimize _clutter_util_fully_transform_vertices
Instead of unconditionally combining the modelview and projection matrices and then iterating each of the vertices to call cogl_matrix_transform_point for each one in turn we now only combine the matrices if there are more than 4 vertices (with less than 4 vertices its less work to transform them separately) and we use the new cogl_vertex_{transform,project}_points APIs which can hopefully vectorize the transformations. Finally the perspective divide and viewport scale is done in a separate loop at the end and we don't do the spurious perspective divide and viewport scale for the z component.
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@ -81,6 +81,14 @@ _clutter_gettext (const gchar *str)
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#define MTX_GL_SCALE_Y(y,w,v1,v2) ((v1) - (((((y) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2))
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#define MTX_GL_SCALE_Z(z,w,v1,v2) (MTX_GL_SCALE_X ((z), (w), (v1), (v2)))
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typedef struct _ClutterVertex4
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{
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float x;
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float y;
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float z;
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float w;
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} ClutterVertex4;
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void
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_clutter_util_fully_transform_vertices (const CoglMatrix *modelview,
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const CoglMatrix *projection,
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@ -90,31 +98,53 @@ _clutter_util_fully_transform_vertices (const CoglMatrix *modelview,
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int n_vertices)
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{
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CoglMatrix modelview_projection;
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ClutterVertex4 *vertices_tmp;
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int i;
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/* XXX: we should find a way to cache this per actor */
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cogl_matrix_multiply (&modelview_projection,
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projection,
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modelview);
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vertices_tmp = g_alloca (sizeof (ClutterVertex4) * n_vertices);
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if (n_vertices >= 4)
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{
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/* XXX: we should find a way to cache this per actor */
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cogl_matrix_multiply (&modelview_projection,
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projection,
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modelview);
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cogl_matrix_project_points (&modelview_projection,
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3,
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sizeof (ClutterVertex),
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vertices_in,
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sizeof (ClutterVertex4),
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vertices_tmp,
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n_vertices);
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}
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else
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{
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cogl_matrix_transform_points (modelview,
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3,
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sizeof (ClutterVertex),
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vertices_in,
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sizeof (ClutterVertex4),
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vertices_tmp,
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n_vertices);
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cogl_matrix_project_points (projection,
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3,
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sizeof (ClutterVertex4),
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vertices_tmp,
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sizeof (ClutterVertex4),
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vertices_tmp,
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n_vertices);
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}
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for (i = 0; i < n_vertices; i++)
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{
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const ClutterVertex *vertex_in = &vertices_in[i];
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ClutterVertex4 vertex_tmp = vertices_tmp[i];
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ClutterVertex *vertex_out = &vertices_out[i];
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gfloat x, y, z, w;
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x = vertex_in->x;
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y = vertex_in->y;
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z = vertex_in->z;
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w = 1.0;
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/* Transform the point using the modelview matrix */
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cogl_matrix_transform_point (&modelview_projection, &x, &y, &z, &w);
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/* Finally translate from OpenGL coords to window coords */
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vertex_out->x = MTX_GL_SCALE_X (x, w, viewport[2], viewport[0]);
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vertex_out->y = MTX_GL_SCALE_Y (y, w, viewport[3], viewport[1]);
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vertex_out->z = MTX_GL_SCALE_Z (z, w, viewport[2], viewport[0]);
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vertex_out->x = MTX_GL_SCALE_X (vertex_tmp.x, vertex_tmp.w,
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viewport[2], viewport[0]);
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vertex_out->y = MTX_GL_SCALE_Y (vertex_tmp.y, vertex_tmp.w,
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viewport[3], viewport[1]);
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}
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}
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@ -498,7 +498,7 @@ typedef struct _Point4f
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static void
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_cogl_matrix_transform_points_f2 (const CoglMatrix *matrix,
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size_t stride_in,
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void *points_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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@ -519,7 +519,7 @@ _cogl_matrix_transform_points_f2 (const CoglMatrix *matrix,
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static void
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_cogl_matrix_project_points_f2 (const CoglMatrix *matrix,
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size_t stride_in,
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void *points_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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@ -541,7 +541,7 @@ _cogl_matrix_project_points_f2 (const CoglMatrix *matrix,
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static void
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_cogl_matrix_transform_points_f3 (const CoglMatrix *matrix,
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size_t stride_in,
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void *points_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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@ -565,7 +565,7 @@ _cogl_matrix_transform_points_f3 (const CoglMatrix *matrix,
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static void
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_cogl_matrix_project_points_f3 (const CoglMatrix *matrix,
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size_t stride_in,
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void *points_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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@ -591,7 +591,7 @@ _cogl_matrix_project_points_f3 (const CoglMatrix *matrix,
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static void
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_cogl_matrix_project_points_f4 (const CoglMatrix *matrix,
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size_t stride_in,
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void *points_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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@ -618,7 +618,7 @@ void
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cogl_matrix_transform_points (const CoglMatrix *matrix,
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int n_components,
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size_t stride_in,
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void *points_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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@ -646,7 +646,7 @@ void
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cogl_matrix_project_points (const CoglMatrix *matrix,
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int n_components,
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size_t stride_in,
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void *points_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points)
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@ -505,7 +505,7 @@ void
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cogl_matrix_transform_points (const CoglMatrix *matrix,
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int n_components,
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size_t stride_in,
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void *points_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points);
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@ -560,7 +560,7 @@ void
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cogl_matrix_project_points (const CoglMatrix *matrix,
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int n_components,
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size_t stride_in,
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void *points_in,
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const void *points_in,
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size_t stride_out,
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void *points_out,
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int n_points);
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