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gltransformation: always build a valid mvp matrix

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The default case is to build an identity matrix.
This commit is contained in:
Matthew Waters 2016-01-15 00:00:29 +11:00 committed by Tim-Philipp Müller
parent e8544db8cf
commit 0e928db89e
1 changed files with 61 additions and 54 deletions
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115
ext/gl/gstgltransformation.c
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@ -265,73 +265,75 @@ gst_gl_transformation_init (GstGLTransformation * filter)
static void
gst_gl_transformation_build_mvp (GstGLTransformation * transformation)
{
graphene_point3d_t translation_vector =
GRAPHENE_POINT3D_INIT (transformation->xtranslation * 2.0 *
transformation->aspect,
transformation->ytranslation * 2.0,
transformation->ztranslation * 2.0);
graphene_point3d_t pivot_vector =
GRAPHENE_POINT3D_INIT (-transformation->xpivot * transformation->aspect,
transformation->ypivot,
-transformation->zpivot);
graphene_point3d_t negative_pivot_vector;
GstGLFilter *filter = GST_GL_FILTER (transformation);
graphene_matrix_t modelview_matrix;
graphene_vec3_t eye;
graphene_vec3_t center;
graphene_vec3_t up;
if (!filter->out_info.finfo) {
graphene_matrix_init_identity (&transformation->model_matrix);
graphene_matrix_init_identity (&transformation->view_matrix);
graphene_matrix_init_identity (&transformation->projection_matrix);
} else {
graphene_point3d_t translation_vector =
GRAPHENE_POINT3D_INIT (transformation->xtranslation * 2.0 *
transformation->aspect,
transformation->ytranslation * 2.0,
transformation->ztranslation * 2.0);
graphene_vec3_init (&eye, 0.f, 0.f, 1.f);
graphene_vec3_init (&center, 0.f, 0.f, 0.f);
graphene_vec3_init (&up, 0.f, 1.f, 0.f);
graphene_point3d_t pivot_vector =
GRAPHENE_POINT3D_INIT (-transformation->xpivot * transformation->aspect,
transformation->ypivot,
-transformation->zpivot);
/* Translate into pivot origin */
graphene_matrix_init_translate (&transformation->model_matrix, &pivot_vector);
graphene_point3d_t negative_pivot_vector;
/* Scale */
graphene_matrix_scale (&transformation->model_matrix,
transformation->xscale, transformation->yscale, 1.0f);
graphene_vec3_t eye;
graphene_vec3_t center;
graphene_vec3_t up;
gboolean passthrough;
graphene_vec3_init (&eye, 0.f, 0.f, 1.f);
graphene_vec3_init (&center, 0.f, 0.f, 0.f);
graphene_vec3_init (&up, 0.f, 1.f, 0.f);
/* Translate into pivot origin */
graphene_matrix_init_translate (&transformation->model_matrix, &pivot_vector);
/* Scale */
graphene_matrix_scale (&transformation->model_matrix,
transformation->xscale, transformation->yscale, 1.0f);
/* Rotation */
graphene_matrix_rotate (&transformation->model_matrix,
transformation->xrotation, graphene_vec3_x_axis ());
graphene_matrix_rotate (&transformation->model_matrix,
transformation->yrotation, graphene_vec3_y_axis ());
graphene_matrix_rotate (&transformation->model_matrix,
transformation->zrotation, graphene_vec3_z_axis ());
graphene_matrix_rotate (&transformation->model_matrix,
transformation->xrotation, graphene_vec3_x_axis ());
graphene_matrix_rotate (&transformation->model_matrix,
transformation->yrotation, graphene_vec3_y_axis ());
graphene_matrix_rotate (&transformation->model_matrix,
transformation->zrotation, graphene_vec3_z_axis ());
/* Translate back from pivot origin */
graphene_point3d_scale (&pivot_vector, -1.0, &negative_pivot_vector);
graphene_matrix_translate (&transformation->model_matrix,
&negative_pivot_vector);
graphene_point3d_scale (&pivot_vector, -1.0, &negative_pivot_vector);
graphene_matrix_translate (&transformation->model_matrix,
&negative_pivot_vector);
/* Translation */
graphene_matrix_translate (&transformation->model_matrix,
&translation_vector);
/* Translation */
graphene_matrix_translate (&transformation->model_matrix,
&translation_vector);
if (transformation->ortho) {
graphene_matrix_init_ortho (&transformation->projection_matrix,
-transformation->aspect, transformation->aspect,
-1, 1, transformation->znear, transformation->zfar);
} else {
graphene_matrix_init_perspective (&transformation->projection_matrix,
transformation->fov,
transformation->aspect, transformation->znear, transformation->zfar);
}
if (transformation->ortho) {
graphene_matrix_init_ortho (&transformation->projection_matrix,
-transformation->aspect, transformation->aspect,
-1, 1, transformation->znear, transformation->zfar);
} else {
graphene_matrix_init_perspective (&transformation->projection_matrix,
transformation->fov,
transformation->aspect, transformation->znear, transformation->zfar);
}
graphene_matrix_init_look_at (&transformation->view_matrix, &eye, &center,
&up);
graphene_matrix_init_look_at (&transformation->view_matrix, &eye, &center,
&up);
graphene_matrix_multiply (&transformation->model_matrix,
&transformation->view_matrix, &modelview_matrix);
graphene_matrix_multiply (&modelview_matrix,
&transformation->projection_matrix, &transformation->mvp_matrix);
if (filter->in_info.finfo) {
gboolean passthrough = transformation->xtranslation == 0.
passthrough = transformation->xtranslation == 0.
&& transformation->ytranslation == 0.
&& transformation->ztranslation == 0.
&& transformation->xrotation == 0.
@ -343,6 +345,11 @@ gst_gl_transformation_build_mvp (GstGLTransformation * transformation)
gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (transformation),
passthrough);
}
graphene_matrix_multiply (&transformation->model_matrix,
&transformation->view_matrix, &modelview_matrix);
graphene_matrix_multiply (&modelview_matrix,
&transformation->projection_matrix, &transformation->mvp_matrix);
}
static void