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gstreamer/ext/gl/gstgltransformation.c
Matthew Waters 9d66a3447f gltransformation: rewrite the inverse transformation logic 
It now returns the correct values for both orthographic and perspective
projections and takes into account the aspect ratio of the video, handles
the Y-flipping in GL and by us and uses some more helpers from graphene.
2016-08-19 16:09:04 +10:00

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/*
* GStreamer
* Copyright (C) 2014 Lubosz Sarnecki <lubosz@gmail.com>
* Copyright (C) 2016 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-gltransformation
*
* Transforms video on the GPU.
*
* <refsect2>
* <title>Examples</title>
* |[
* gst-launch-1.0 gltestsrc ! gltransformation rotation-z=45 ! glimagesink
* ]| A pipeline to rotate by 45 degrees
* |[
* gst-launch-1.0 gltestsrc ! gltransformation translation-x=0.5 ! glimagesink
* ]| Translate the video by 0.5
* |[
* gst-launch-1.0 gltestsrc ! gltransformation scale-y=0.5 scale-x=0.5 ! glimagesink
* ]| Resize the video by 0.5
* |[
* gst-launch-1.0 gltestsrc ! gltransformation rotation-x=-45 ortho=True ! glimagesink
* ]| Rotate the video around the X-Axis by -45° with an orthographic projection
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstgltransformation.h"
#include <gst/gl/gstglapi.h>
#include <graphene-gobject.h>
#define GST_CAT_DEFAULT gst_gl_transformation_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define gst_gl_transformation_parent_class parent_class
#define VEC4_FORMAT "%f,%f,%f,%f"
#define VEC4_ARGS(v) graphene_vec4_get_x (v), graphene_vec4_get_y (v), graphene_vec4_get_z (v), graphene_vec4_get_w (v)
#define VEC3_FORMAT "%f,%f,%f"
#define VEC3_ARGS(v) graphene_vec3_get_x (v), graphene_vec3_get_y (v), graphene_vec3_get_z (v)
#define VEC2_FORMAT "%f,%f"
#define VEC2_ARGS(v) graphene_vec2_get_x (v), graphene_vec2_get_y (v)
#define POINT3D_FORMAT "%f,%f,%f"
#define POINT3D_ARGS(p) (p)->x, (p)->y, (p)->z
enum
{
PROP_0,
PROP_FOV,
PROP_ORTHO,
PROP_TRANSLATION_X,
PROP_TRANSLATION_Y,
PROP_TRANSLATION_Z,
PROP_ROTATION_X,
PROP_ROTATION_Y,
PROP_ROTATION_Z,
PROP_SCALE_X,
PROP_SCALE_Y,
PROP_MVP,
PROP_PIVOT_X,
PROP_PIVOT_Y,
PROP_PIVOT_Z,
};
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_transformation_debug, "gltransformation", 0, "gltransformation element");
G_DEFINE_TYPE_WITH_CODE (GstGLTransformation, gst_gl_transformation,
GST_TYPE_GL_FILTER, DEBUG_INIT);
static void gst_gl_transformation_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_gl_transformation_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_gl_transformation_set_caps (GstGLFilter * filter,
GstCaps * incaps, GstCaps * outcaps);
static gboolean gst_gl_transformation_src_event (GstBaseTransform * trans,
GstEvent * event);
static gboolean gst_gl_transformation_filter_meta (GstBaseTransform * trans,
GstQuery * query, GType api, const GstStructure * params);
static gboolean gst_gl_transformation_decide_allocation (GstBaseTransform *
trans, GstQuery * query);
static void gst_gl_transformation_reset_gl (GstGLFilter * filter);
static gboolean gst_gl_transformation_stop (GstBaseTransform * trans);
static gboolean gst_gl_transformation_init_shader (GstGLFilter * filter);
static gboolean gst_gl_transformation_callback (gpointer stuff);
static void gst_gl_transformation_build_mvp (GstGLTransformation *
transformation);
static GstFlowReturn
gst_gl_transformation_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer ** outbuf);
static gboolean gst_gl_transformation_filter (GstGLFilter * filter,
GstBuffer * inbuf, GstBuffer * outbuf);
static gboolean gst_gl_transformation_filter_texture (GstGLFilter * filter,
GstGLMemory * in_tex, GstGLMemory * out_tex);
static void
gst_gl_transformation_class_init (GstGLTransformationClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
GstBaseTransformClass *base_transform_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
base_transform_class = GST_BASE_TRANSFORM_CLASS (klass);
gobject_class->set_property = gst_gl_transformation_set_property;
gobject_class->get_property = gst_gl_transformation_get_property;
base_transform_class->src_event = gst_gl_transformation_src_event;
base_transform_class->decide_allocation =
gst_gl_transformation_decide_allocation;
base_transform_class->filter_meta = gst_gl_transformation_filter_meta;
GST_GL_FILTER_CLASS (klass)->init_fbo = gst_gl_transformation_init_shader;
GST_GL_FILTER_CLASS (klass)->display_reset_cb =
gst_gl_transformation_reset_gl;
GST_GL_FILTER_CLASS (klass)->set_caps = gst_gl_transformation_set_caps;
GST_GL_FILTER_CLASS (klass)->filter = gst_gl_transformation_filter;
GST_GL_FILTER_CLASS (klass)->filter_texture =
gst_gl_transformation_filter_texture;
GST_BASE_TRANSFORM_CLASS (klass)->stop = gst_gl_transformation_stop;
GST_BASE_TRANSFORM_CLASS (klass)->prepare_output_buffer =
gst_gl_transformation_prepare_output_buffer;
g_object_class_install_property (gobject_class, PROP_FOV,
g_param_spec_float ("fov", "Fov", "Field of view angle in degrees",
0.0, G_MAXFLOAT, 90.0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ORTHO,
g_param_spec_boolean ("ortho", "Orthographic",
"Use orthographic projection", FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/* Rotation */
g_object_class_install_property (gobject_class, PROP_ROTATION_X,
g_param_spec_float ("rotation-x", "X Rotation",
"Rotates the video around the X-Axis in degrees.",
-G_MAXFLOAT, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ROTATION_Y,
g_param_spec_float ("rotation-y", "Y Rotation",
"Rotates the video around the Y-Axis in degrees.",
-G_MAXFLOAT, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ROTATION_Z,
g_param_spec_float ("rotation-z", "Z Rotation",
"Rotates the video around the Z-Axis in degrees.",
-G_MAXFLOAT, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/* Translation */
g_object_class_install_property (gobject_class, PROP_TRANSLATION_X,
g_param_spec_float ("translation-x", "X Translation",
"Translates the video at the X-Axis, in universal [0-1] coordinate.",
-G_MAXFLOAT, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TRANSLATION_Y,
g_param_spec_float ("translation-y", "Y Translation",
"Translates the video at the Y-Axis, in universal [0-1] coordinate.",
-G_MAXFLOAT, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TRANSLATION_Z,
g_param_spec_float ("translation-z", "Z Translation",
"Translates the video at the Z-Axis, in universal [0-1] coordinate.",
-G_MAXFLOAT, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/* Scale */
g_object_class_install_property (gobject_class, PROP_SCALE_X,
g_param_spec_float ("scale-x", "X Scale",
"Scale multiplier for the X-Axis.",
-G_MAXFLOAT, G_MAXFLOAT, 1.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SCALE_Y,
g_param_spec_float ("scale-y", "Y Scale",
"Scale multiplier for the Y-Axis.",
-G_MAXFLOAT, G_MAXFLOAT, 1.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/* Pivot */
g_object_class_install_property (gobject_class, PROP_PIVOT_X,
g_param_spec_float ("pivot-x", "X Pivot",
"Rotation pivot point X coordinate, where 0 is the center,"
" -1 the left border, +1 the right border and <-1, >1 outside.",
-G_MAXFLOAT, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PIVOT_Y,
g_param_spec_float ("pivot-y", "Y Pivot",
"Rotation pivot point X coordinate, where 0 is the center,"
" -1 the left border, +1 the right border and <-1, >1 outside.",
-G_MAXFLOAT, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PIVOT_Z,
g_param_spec_float ("pivot-z", "Z Pivot",
"Relevant for rotation in 3D space. You look into the negative Z axis direction",
-G_MAXFLOAT, G_MAXFLOAT, 0.0,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/* MVP */
g_object_class_install_property (gobject_class, PROP_MVP,
g_param_spec_boxed ("mvp-matrix",
"Modelview Projection Matrix",
"The final Graphene 4x4 Matrix for transformation",
GRAPHENE_TYPE_MATRIX, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_metadata (element_class, "OpenGL transformation filter",
"Filter/Effect/Video", "Transform video on the GPU",
"Lubosz Sarnecki <lubosz@gmail.com>\n"
"Matthew Waters <matthew@centricular.com>");
GST_GL_BASE_FILTER_CLASS (klass)->supported_gl_api =
GST_GL_API_OPENGL | GST_GL_API_OPENGL3 | GST_GL_API_GLES2;
}
static void
gst_gl_transformation_init (GstGLTransformation * filter)
{
filter->shader = NULL;
filter->fov = 90;
filter->aspect = 1.0;
filter->znear = 0.1;
filter->zfar = 100;
filter->xscale = 1.0;
filter->yscale = 1.0;
filter->in_tex = 0;
gst_gl_transformation_build_mvp (filter);
}
static void
gst_gl_transformation_build_mvp (GstGLTransformation * transformation)
{
GstGLFilter *filter = GST_GL_FILTER (transformation);
graphene_matrix_t modelview_matrix;
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_point3d_t pivot_vector =
GRAPHENE_POINT3D_INIT (-transformation->xpivot * transformation->aspect,
transformation->ypivot,
-transformation->zpivot);
graphene_point3d_t negative_pivot_vector;
graphene_vec3_t center;
graphene_vec3_t up;
gboolean current_passthrough;
gboolean passthrough;
graphene_vec3_init (&transformation->camera_position, 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 ());
/* Translate back from pivot origin */
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);
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,
&transformation->camera_position, &center, &up);
current_passthrough =
gst_base_transform_is_passthrough (GST_BASE_TRANSFORM (transformation));
passthrough = transformation->xtranslation == 0.
&& transformation->ytranslation == 0.
&& transformation->ztranslation == 0. && transformation->xrotation == 0.
&& transformation->yrotation == 0. && transformation->zrotation == 0.
&& transformation->xscale == 1. && transformation->yscale == 1.
&& gst_video_info_is_equal (&filter->in_info, &filter->out_info);
gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (transformation),
passthrough);
if (current_passthrough != passthrough) {
gst_base_transform_reconfigure_src (GST_BASE_TRANSFORM (transformation));
}
}
graphene_matrix_multiply (&transformation->model_matrix,
&transformation->view_matrix, &modelview_matrix);
graphene_matrix_multiply (&modelview_matrix,
&transformation->projection_matrix, &transformation->mvp_matrix);
graphene_matrix_inverse (&transformation->model_matrix,
&transformation->inv_model_matrix);
graphene_matrix_inverse (&transformation->view_matrix,
&transformation->inv_view_matrix);
graphene_matrix_inverse (&transformation->projection_matrix,
&transformation->inv_projection_matrix);
}
static void
gst_gl_transformation_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLTransformation *filter = GST_GL_TRANSFORMATION (object);
switch (prop_id) {
case PROP_FOV:
filter->fov = g_value_get_float (value);
break;
case PROP_ORTHO:
filter->ortho = g_value_get_boolean (value);
break;
case PROP_TRANSLATION_X:
filter->xtranslation = g_value_get_float (value);
break;
case PROP_TRANSLATION_Y:
filter->ytranslation = g_value_get_float (value);
break;
case PROP_TRANSLATION_Z:
filter->ztranslation = g_value_get_float (value);
break;
case PROP_ROTATION_X:
filter->xrotation = g_value_get_float (value);
break;
case PROP_ROTATION_Y:
filter->yrotation = g_value_get_float (value);
break;
case PROP_ROTATION_Z:
filter->zrotation = g_value_get_float (value);
break;
case PROP_SCALE_X:
filter->xscale = g_value_get_float (value);
break;
case PROP_SCALE_Y:
filter->yscale = g_value_get_float (value);
break;
case PROP_PIVOT_X:
filter->xpivot = g_value_get_float (value);
break;
case PROP_PIVOT_Y:
filter->ypivot = g_value_get_float (value);
break;
case PROP_PIVOT_Z:
filter->zpivot = g_value_get_float (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
gst_gl_transformation_build_mvp (filter);
}
static void
gst_gl_transformation_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLTransformation *filter = GST_GL_TRANSFORMATION (object);
switch (prop_id) {
case PROP_FOV:
g_value_set_float (value, filter->fov);
break;
case PROP_ORTHO:
g_value_set_boolean (value, filter->ortho);
break;
case PROP_TRANSLATION_X:
g_value_set_float (value, filter->xtranslation);
break;
case PROP_TRANSLATION_Y:
g_value_set_float (value, filter->ytranslation);
break;
case PROP_TRANSLATION_Z:
g_value_set_float (value, filter->ztranslation);
break;
case PROP_ROTATION_X:
g_value_set_float (value, filter->xrotation);
break;
case PROP_ROTATION_Y:
g_value_set_float (value, filter->yrotation);
break;
case PROP_ROTATION_Z:
g_value_set_float (value, filter->zrotation);
break;
case PROP_SCALE_X:
g_value_set_float (value, filter->xscale);
break;
case PROP_SCALE_Y:
g_value_set_float (value, filter->yscale);
break;
case PROP_PIVOT_X:
g_value_set_float (value, filter->xpivot);
break;
case PROP_PIVOT_Y:
g_value_set_float (value, filter->ypivot);
break;
case PROP_PIVOT_Z:
g_value_set_float (value, filter->zpivot);
break;
case PROP_MVP:
/* FIXME: need to decompose this to support navigation events */
g_value_set_boxed (value, (gconstpointer) & filter->mvp_matrix);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_gl_transformation_set_caps (GstGLFilter * filter, GstCaps * incaps,
GstCaps * outcaps)
{
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (filter);
transformation->aspect =
(gdouble) GST_VIDEO_INFO_WIDTH (&filter->out_info) /
(gdouble) GST_VIDEO_INFO_HEIGHT (&filter->out_info);
transformation->caps_change = TRUE;
gst_gl_transformation_build_mvp (transformation);
return TRUE;
}
static void
_intersect_plane_and_ray (graphene_plane_t * video_plane, graphene_ray_t * ray,
graphene_point3d_t * result)
{
float t = graphene_ray_get_distance_to_plane (ray, video_plane);
GST_TRACE ("Calculated a distance of %f to the plane", t);
graphene_ray_get_position_at (ray, t, result);
}
static void
_screen_coord_to_world_ray (GstGLTransformation * transformation, float x,
float y, graphene_ray_t * ray)
{
GstGLFilter *filter = GST_GL_FILTER (transformation);
gfloat w = (gfloat) GST_VIDEO_INFO_WIDTH (&filter->in_info);
gfloat h = (gfloat) GST_VIDEO_INFO_HEIGHT (&filter->in_info);
graphene_vec3_t ray_eye_vec3, ray_world_dir, *ray_origin, *ray_direction;
graphene_vec3_t ray_ortho_dir;
graphene_point3d_t ray_clip, ray_eye;
graphene_vec2_t screen_coord;
/* GL is y-flipped. i.e. 0, 0 is the bottom left corner in screen space */
graphene_vec2_init (&screen_coord, (2. * x / w - 1.) / transformation->aspect,
1. - 2. * y / h);
graphene_point3d_init (&ray_clip, graphene_vec2_get_x (&screen_coord),
graphene_vec2_get_y (&screen_coord), -1.);
graphene_matrix_transform_point3d (&transformation->inv_projection_matrix,
&ray_clip, &ray_eye);
graphene_vec3_init (&ray_eye_vec3, ray_eye.x, ray_eye.y, -1.);
if (transformation->ortho) {
graphene_vec3_init (&ray_ortho_dir, 0., 0., 1.);
ray_origin = &ray_eye_vec3;
ray_direction = &ray_ortho_dir;
} else {
graphene_matrix_transform_vec3 (&transformation->inv_view_matrix,
&ray_eye_vec3, &ray_world_dir);
graphene_vec3_normalize (&ray_world_dir, &ray_world_dir);
ray_origin = &transformation->camera_position;
ray_direction = &ray_world_dir;
}
graphene_ray_init_from_vec3 (ray, ray_origin, ray_direction);
GST_TRACE_OBJECT (transformation, "Calculated ray origin: " VEC3_FORMAT
" direction: " VEC3_FORMAT " from screen coordinates: " VEC2_FORMAT
" with %s projection",
VEC3_ARGS (ray_origin), VEC3_ARGS (ray_direction),
VEC2_ARGS (&screen_coord),
transformation->ortho ? "ortho" : "perspection");
}
static void
_init_world_video_plane (GstGLTransformation * transformation,
graphene_plane_t * video_plane)
{
graphene_point3d_t bottom_left, bottom_right, top_left, top_right;
graphene_point3d_t world_bottom_left, world_bottom_right;
graphene_point3d_t world_top_left, world_top_right;
graphene_point3d_init (&top_left, -transformation->aspect, 1., 0.);
graphene_point3d_init (&top_right, transformation->aspect, 1., 0.);
graphene_point3d_init (&bottom_left, -transformation->aspect, -1., 0.);
graphene_point3d_init (&bottom_right, transformation->aspect, -1., 0.);
graphene_matrix_transform_point3d (&transformation->model_matrix,
&bottom_left, &world_bottom_left);
graphene_matrix_transform_point3d (&transformation->model_matrix,
&bottom_right, &world_bottom_right);
graphene_matrix_transform_point3d (&transformation->model_matrix,
&top_left, &world_top_left);
graphene_matrix_transform_point3d (&transformation->model_matrix,
&top_right, &world_top_right);
graphene_plane_init_from_points (video_plane, &world_bottom_left,
&world_top_right, &world_top_left);
}
static gboolean
_screen_coord_to_model_coord (GstGLTransformation * transformation,
double x, double y, double *res_x, double *res_y)
{
GstGLFilter *filter = GST_GL_FILTER (transformation);
double w = (double) GST_VIDEO_INFO_WIDTH (&filter->in_info);
double h = (double) GST_VIDEO_INFO_HEIGHT (&filter->in_info);
graphene_point3d_t world_point, model_coord;
graphene_plane_t video_plane;
graphene_ray_t ray;
double new_x, new_y;
_init_world_video_plane (transformation, &video_plane);
_screen_coord_to_world_ray (transformation, x, y, &ray);
_intersect_plane_and_ray (&video_plane, &ray, &world_point);
graphene_matrix_transform_point3d (&transformation->inv_model_matrix,
&world_point, &model_coord);
/* ndc to pixels. We render the frame Y-flipped so need to unflip the
* y coordinate */
new_x = (model_coord.x + 1.) * w / 2;
new_y = (1. - model_coord.y) * h / 2;
if (new_x < 0. || new_x > w || new_y < 0. || new_y > h)
/* coords off video surface */
return FALSE;
GST_DEBUG_OBJECT (transformation, "converted %f,%f to %f,%f", x, y, new_x,
new_y);
if (res_x)
*res_x = new_x;
if (res_y)
*res_y = new_y;
return TRUE;
}
#if 0
/* debugging facilities for transforming vertices from model space to screen
* space */
static void
_ndc_to_viewport (GstGLTransformation * transformation, graphene_vec3_t * ndc,
int x, int y, int w, int h, float near, float far, graphene_vec3_t * result)
{
GstGLFilter *filter = GST_GL_FILTER (transformation);
/* center of the viewport */
int o_x = x + w / 2;
int o_y = y + h / 2;
graphene_vec3_init (result, graphene_vec3_get_x (ndc) * w / 2 + o_x,
graphene_vec3_get_y (ndc) * h / 2 + o_y,
(far - near) * graphene_vec3_get_z (ndc) / 2 + (far + near) / 2);
}
static void
_perspective_division (graphene_vec4_t * clip, graphene_vec3_t * result)
{
float w = graphene_vec4_get_w (clip);
graphene_vec3_init (result, graphene_vec4_get_x (clip) / w,
graphene_vec4_get_y (clip) / w, graphene_vec4_get_z (clip) / w);
}
static void
_vertex_to_screen_coord (GstGLTransformation * transformation,
graphene_vec4_t * vertex, graphene_vec3_t * view)
{
GstGLFilter *filter = GST_GL_FILTER (transformation);
gint w = GST_VIDEO_INFO_WIDTH (&filter->in_info);
gint h = GST_VIDEO_INFO_HEIGHT (&filter->in_info);
graphene_vec4_t clip;
graphene_vec3_t ndc;
graphene_matrix_transform_vec4 (&transformation->mvp_matrix, vertex, &clip);
_perspective_division (&clip, &ndc);
_ndc_to_viewport (transformation, &ndc, 0, 0, w, h, 0., 1., view);
}
#endif
static gboolean
gst_gl_transformation_src_event (GstBaseTransform * trans, GstEvent * event)
{
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (trans);
GstStructure *structure;
gboolean ret;
GST_DEBUG_OBJECT (trans, "handling %s event", GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NAVIGATION:{
gdouble x, y;
event =
GST_EVENT (gst_mini_object_make_writable (GST_MINI_OBJECT (event)));
structure = (GstStructure *) gst_event_get_structure (event);
if (gst_structure_get_double (structure, "pointer_x", &x) &&
gst_structure_get_double (structure, "pointer_y", &y)) {
gdouble new_x, new_y;
if (!_screen_coord_to_model_coord (transformation, x, y, &new_x,
&new_y)) {
gst_event_unref (event);
return TRUE;
}
gst_structure_set (structure, "pointer_x", G_TYPE_DOUBLE, new_x,
"pointer_y", G_TYPE_DOUBLE, new_y, NULL);
}
break;
}
default:
break;
}
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->src_event (trans, event);
return ret;
}
static gboolean
gst_gl_transformation_filter_meta (GstBaseTransform * trans, GstQuery * query,
GType api, const GstStructure * params)
{
if (api == GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE)
return TRUE;
if (api == GST_GL_SYNC_META_API_TYPE)
return TRUE;
return FALSE;
}
static gboolean
gst_gl_transformation_decide_allocation (GstBaseTransform * trans,
GstQuery * query)
{
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (trans);
if (!GST_BASE_TRANSFORM_CLASS (parent_class)->decide_allocation (trans,
query))
return FALSE;
if (gst_query_find_allocation_meta (query,
GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE, NULL)) {
transformation->downstream_supports_affine_meta = TRUE;
} else {
transformation->downstream_supports_affine_meta = FALSE;
}
return TRUE;
}
static void
gst_gl_transformation_reset_gl (GstGLFilter * filter)
{
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (filter);
const GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
if (transformation->vao) {
gl->DeleteVertexArrays (1, &transformation->vao);
transformation->vao = 0;
}
if (transformation->vertex_buffer) {
gl->DeleteBuffers (1, &transformation->vertex_buffer);
transformation->vertex_buffer = 0;
}
if (transformation->vbo_indices) {
gl->DeleteBuffers (1, &transformation->vbo_indices);
transformation->vbo_indices = 0;
}
if (transformation->shader) {
gst_object_unref (transformation->shader);
transformation->shader = NULL;
}
}
static gboolean
gst_gl_transformation_stop (GstBaseTransform * trans)
{
GstGLBaseFilter *basefilter = GST_GL_BASE_FILTER (trans);
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (trans);
/* blocking call, wait until the opengl thread has destroyed the shader */
if (basefilter->context && transformation->shader) {
gst_gl_context_del_shader (basefilter->context, transformation->shader);
transformation->shader = NULL;
}
return GST_BASE_TRANSFORM_CLASS (parent_class)->stop (trans);
}
static gboolean
gst_gl_transformation_init_shader (GstGLFilter * filter)
{
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (filter);
if (transformation->shader) {
gst_object_unref (transformation->shader);
transformation->shader = NULL;
}
if (gst_gl_context_get_gl_api (GST_GL_BASE_FILTER (filter)->context)) {
/* blocking call, wait until the opengl thread has compiled the shader */
return gst_gl_context_gen_shader (GST_GL_BASE_FILTER (filter)->context,
gst_gl_shader_string_vertex_mat4_vertex_transform,
gst_gl_shader_string_fragment_default, &transformation->shader);
}
return TRUE;
}
static const gfloat from_ndc_matrix[] = {
0.5f, 0.0f, 0.0, 0.5f,
0.0f, 0.5f, 0.0, 0.5f,
0.0f, 0.0f, 0.5, 0.5f,
0.0f, 0.0f, 0.0, 1.0f,
};
static const gfloat to_ndc_matrix[] = {
2.0f, 0.0f, 0.0, -1.0f,
0.0f, 2.0f, 0.0, -1.0f,
0.0f, 0.0f, 2.0, -1.0f,
0.0f, 0.0f, 0.0, 1.0f,
};
static GstFlowReturn
gst_gl_transformation_prepare_output_buffer (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer ** outbuf)
{
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (trans);
GstGLFilter *filter = GST_GL_FILTER (trans);
if (transformation->downstream_supports_affine_meta &&
gst_video_info_is_equal (&filter->in_info, &filter->out_info)) {
GstVideoAffineTransformationMeta *af_meta;
graphene_matrix_t upstream_matrix, from_ndc, to_ndc, tmp, tmp2, inv_aspect;
*outbuf = gst_buffer_make_writable (inbuf);
af_meta = gst_buffer_get_video_affine_transformation_meta (inbuf);
if (!af_meta)
af_meta = gst_buffer_add_video_affine_transformation_meta (*outbuf);
GST_LOG_OBJECT (trans, "applying transformation to existing affine "
"transformation meta");
/* apply the transformation to the existing affine meta */
graphene_matrix_init_from_float (&from_ndc, from_ndc_matrix);
graphene_matrix_init_from_float (&to_ndc, to_ndc_matrix);
graphene_matrix_init_from_float (&upstream_matrix, af_meta->matrix);
graphene_matrix_init_scale (&inv_aspect, transformation->aspect, 1., 1.);
graphene_matrix_multiply (&from_ndc, &upstream_matrix, &tmp);
graphene_matrix_multiply (&tmp, &transformation->mvp_matrix, &tmp2);
graphene_matrix_multiply (&tmp2, &inv_aspect, &tmp);
graphene_matrix_multiply (&tmp, &to_ndc, &tmp2);
graphene_matrix_to_float (&tmp2, af_meta->matrix);
return GST_FLOW_OK;
}
return GST_BASE_TRANSFORM_CLASS (parent_class)->prepare_output_buffer (trans,
inbuf, outbuf);
}
static gboolean
gst_gl_transformation_filter (GstGLFilter * filter,
GstBuffer * inbuf, GstBuffer * outbuf)
{
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (filter);
if (transformation->downstream_supports_affine_meta &&
gst_video_info_is_equal (&filter->in_info, &filter->out_info)) {
return TRUE;
} else {
return gst_gl_filter_filter_texture (filter, inbuf, outbuf);
}
}
static gboolean
gst_gl_transformation_filter_texture (GstGLFilter * filter,
GstGLMemory * in_tex, GstGLMemory * out_tex)
{
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (filter);
transformation->in_tex = in_tex;
gst_gl_framebuffer_draw_to_texture (filter->fbo, out_tex,
(GstGLFramebufferFunc) gst_gl_transformation_callback, transformation);
return TRUE;
}
static const GLushort indices[] = { 0, 1, 2, 3, 0 };
static void
_upload_vertices (GstGLTransformation * transformation)
{
const GstGLFuncs *gl =
GST_GL_BASE_FILTER (transformation)->context->gl_vtable;
/* *INDENT-OFF* */
GLfloat vertices[] = {
-transformation->aspect, 1.0, 0.0, 1.0, 0.0, 1.0,
transformation->aspect, 1.0, 0.0, 1.0, 1.0, 1.0,
transformation->aspect, -1.0, 0.0, 1.0, 1.0, 0.0,
-transformation->aspect, -1.0, 0.0, 1.0, 0.0, 0.0
};
/* *INDENT-ON* */
gl->BindBuffer (GL_ARRAY_BUFFER, transformation->vertex_buffer);
gl->BufferData (GL_ARRAY_BUFFER, 4 * 6 * sizeof (GLfloat), vertices,
GL_STATIC_DRAW);
}
static void
_bind_buffer (GstGLTransformation * transformation)
{
const GstGLFuncs *gl =
GST_GL_BASE_FILTER (transformation)->context->gl_vtable;
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, transformation->vbo_indices);
gl->BindBuffer (GL_ARRAY_BUFFER, transformation->vertex_buffer);
/* Load the vertex position */
gl->VertexAttribPointer (transformation->attr_position, 4, GL_FLOAT,
GL_FALSE, 6 * sizeof (GLfloat), (void *) 0);
/* Load the texture coordinate */
gl->VertexAttribPointer (transformation->attr_texture, 2, GL_FLOAT, GL_FALSE,
6 * sizeof (GLfloat), (void *) (4 * sizeof (GLfloat)));
gl->EnableVertexAttribArray (transformation->attr_position);
gl->EnableVertexAttribArray (transformation->attr_texture);
}
static void
_unbind_buffer (GstGLTransformation * transformation)
{
const GstGLFuncs *gl =
GST_GL_BASE_FILTER (transformation)->context->gl_vtable;
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, 0);
gl->BindBuffer (GL_ARRAY_BUFFER, 0);
gl->DisableVertexAttribArray (transformation->attr_position);
gl->DisableVertexAttribArray (transformation->attr_texture);
}
static gboolean
gst_gl_transformation_callback (gpointer stuff)
{
GstGLFilter *filter = GST_GL_FILTER (stuff);
GstGLTransformation *transformation = GST_GL_TRANSFORMATION (filter);
GstGLFuncs *gl = GST_GL_BASE_FILTER (filter)->context->gl_vtable;
GLfloat temp_matrix[16];
gst_gl_context_clear_shader (GST_GL_BASE_FILTER (filter)->context);
gl->BindTexture (GL_TEXTURE_2D, 0);
gl->ClearColor (0.f, 0.f, 0.f, 0.f);
gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
gst_gl_shader_use (transformation->shader);
gl->ActiveTexture (GL_TEXTURE0);
gl->BindTexture (GL_TEXTURE_2D, transformation->in_tex->tex_id);
gst_gl_shader_set_uniform_1i (transformation->shader, "texture", 0);
graphene_matrix_to_float (&transformation->mvp_matrix, temp_matrix);
gst_gl_shader_set_uniform_matrix_4fv (transformation->shader,
"u_transformation", 1, GL_FALSE, temp_matrix);
if (!transformation->vertex_buffer) {
transformation->attr_position =
gst_gl_shader_get_attribute_location (transformation->shader,
"a_position");
transformation->attr_texture =
gst_gl_shader_get_attribute_location (transformation->shader,
"a_texcoord");
if (gl->GenVertexArrays) {
gl->GenVertexArrays (1, &transformation->vao);
gl->BindVertexArray (transformation->vao);
}
gl->GenBuffers (1, &transformation->vertex_buffer);
gl->GenBuffers (1, &transformation->vbo_indices);
gl->BindBuffer (GL_ELEMENT_ARRAY_BUFFER, transformation->vbo_indices);
gl->BufferData (GL_ELEMENT_ARRAY_BUFFER, sizeof (indices), indices,
GL_STATIC_DRAW);
transformation->caps_change = TRUE;
}
if (gl->GenVertexArrays)
gl->BindVertexArray (transformation->vao);
if (transformation->caps_change) {
_upload_vertices (transformation);
_bind_buffer (transformation);
} else if (!gl->GenVertexArrays) {
_bind_buffer (transformation);
}
gl->DrawElements (GL_TRIANGLE_STRIP, 5, GL_UNSIGNED_SHORT, 0);
if (gl->GenVertexArrays)
gl->BindVertexArray (0);
else
_unbind_buffer (transformation);
gst_gl_context_clear_shader (GST_GL_BASE_FILTER (filter)->context);
transformation->caps_change = FALSE;
return TRUE;
}
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