| /* |
| * GStreamer |
| * Copyright (C) 2014 Lubosz Sarnecki <lubosz@gmail.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 gltestsrc ! gltransformation rotation-z=45 ! glimagesink |
| * ]| A pipeline to rotate by 45 degrees |
| * |[ |
| * gst-launch gltestsrc ! gltransformation translation-x=0.5 ! glimagesink |
| * ]| Translate the video by 0.5 |
| * |[ |
| * gst-launch gltestsrc ! gltransformation scale-y=0.5 scale-x=0.5 ! glimagesink |
| * ]| Resize the video by 0.5 |
| * |[ |
| * gst-launch 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 |
| |
| 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 |
| }; |
| |
| #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 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 void gst_gl_transformation_callback (gpointer stuff); |
| static void gst_gl_transformation_build_mvp (GstGLTransformation * |
| transformation); |
| |
| static gboolean gst_gl_transformation_filter_texture (GstGLFilter * filter, |
| guint in_tex, guint out_tex); |
| |
| /* vertex source */ |
| static const gchar *cube_v_src = |
| "attribute vec4 position; \n" |
| "attribute vec2 uv; \n" |
| "uniform mat4 mvp; \n" |
| "varying vec2 out_uv; \n" |
| "void main() \n" |
| "{ \n" |
| " gl_Position = mvp * position; \n" |
| " out_uv = uv; \n" |
| "} \n"; |
| |
| /* fragment source */ |
| static const gchar *cube_f_src = |
| "#ifdef GL_ES \n" |
| " precision mediump float; \n" |
| "#endif \n" |
| "varying vec2 out_uv; \n" |
| "uniform sampler2D texture; \n" |
| "void main() \n" |
| "{ \n" |
| " gl_FragColor = texture2D (texture, out_uv);\n" |
| "} \n"; |
| |
| static void |
| gst_gl_transformation_class_init (GstGLTransformationClass * klass) |
| { |
| GObjectClass *gobject_class; |
| GstElementClass *element_class; |
| |
| gobject_class = (GObjectClass *) klass; |
| element_class = GST_ELEMENT_CLASS (klass); |
| |
| gobject_class->set_property = gst_gl_transformation_set_property; |
| gobject_class->get_property = gst_gl_transformation_get_property; |
| |
| 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_texture = |
| gst_gl_transformation_filter_texture; |
| GST_BASE_TRANSFORM_CLASS (klass)->stop = gst_gl_transformation_stop; |
| |
| 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.", |
| 0.0, 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.", |
| 0.0, G_MAXFLOAT, 1.0, 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_READABLE | 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>"); |
| |
| 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) |
| { |
| graphene_point3d_t translation_vector = |
| GRAPHENE_POINT3D_INIT (transformation->xtranslation * 2.0 * |
| transformation->aspect, |
| transformation->ytranslation * 2.0, |
| transformation->ztranslation * 2.0); |
| |
| graphene_matrix_t model_matrix; |
| graphene_matrix_t projection_matrix; |
| graphene_matrix_t view_matrix; |
| graphene_matrix_t vp_matrix; |
| |
| graphene_vec3_t eye; |
| graphene_vec3_t center; |
| graphene_vec3_t up; |
| |
| graphene_vec3_init (&eye, 0.f, 0.f, 1.f); |
| graphene_vec3_init (¢er, 0.f, 0.f, 0.f); |
| graphene_vec3_init (&up, 0.f, 1.f, 0.f); |
| |
| graphene_matrix_init_scale (&model_matrix, |
| transformation->xscale, transformation->yscale, 1.0f); |
| |
| graphene_matrix_rotate (&model_matrix, |
| transformation->xrotation, graphene_vec3_x_axis ()); |
| graphene_matrix_rotate (&model_matrix, |
| transformation->yrotation, graphene_vec3_y_axis ()); |
| graphene_matrix_rotate (&model_matrix, |
| transformation->zrotation, graphene_vec3_z_axis ()); |
| |
| graphene_matrix_translate (&model_matrix, &translation_vector); |
| |
| if (transformation->ortho) { |
| graphene_matrix_init_ortho (&projection_matrix, |
| -transformation->aspect, transformation->aspect, |
| -1, 1, transformation->znear, transformation->zfar); |
| } else { |
| graphene_matrix_init_perspective (&projection_matrix, |
| transformation->fov, |
| transformation->aspect, transformation->znear, transformation->zfar); |
| } |
| |
| graphene_matrix_init_look_at (&view_matrix, &eye, ¢er, &up); |
| |
| graphene_matrix_multiply (&view_matrix, &projection_matrix, &vp_matrix); |
| graphene_matrix_multiply (&model_matrix, &vp_matrix, |
| &transformation->mvp_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_MVP: |
| if (g_value_get_boxed (value) != NULL) |
| filter->mvp_matrix = *((graphene_matrix_t *) g_value_get_boxed (value)); |
| return; |
| 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_MVP: |
| 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 |
| 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->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, |
| cube_v_src, cube_f_src, &transformation->shader); |
| } |
| return TRUE; |
| } |
| |
| static gboolean |
| gst_gl_transformation_filter_texture (GstGLFilter * filter, guint in_tex, |
| guint out_tex) |
| { |
| GstGLTransformation *transformation = GST_GL_TRANSFORMATION (filter); |
| |
| transformation->in_tex = in_tex; |
| |
| /* blocking call, use a FBO */ |
| gst_gl_context_use_fbo_v2 (GST_GL_BASE_FILTER (filter)->context, |
| GST_VIDEO_INFO_WIDTH (&filter->out_info), |
| GST_VIDEO_INFO_HEIGHT (&filter->out_info), |
| filter->fbo, filter->depthbuffer, |
| out_tex, gst_gl_transformation_callback, (gpointer) transformation); |
| |
| return TRUE; |
| } |
| |
| |
| 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_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_ARRAY_BUFFER, 0); |
| |
| gl->DisableVertexAttribArray (transformation->attr_position); |
| gl->DisableVertexAttribArray (transformation->attr_texture); |
| } |
| |
| static void |
| 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; |
| |
| GLushort indices[] = { 0, 1, 2, 3, 0 }; |
| |
| 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, 1.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); |
| 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, "mvp", |
| 1, GL_FALSE, temp_matrix); |
| |
| if (!transformation->vertex_buffer) { |
| transformation->attr_position = |
| gst_gl_shader_get_attribute_location (transformation->shader, |
| "position"); |
| |
| transformation->attr_texture = |
| gst_gl_shader_get_attribute_location (transformation->shader, "uv"); |
| |
| if (gl->GenVertexArrays) { |
| gl->GenVertexArrays (1, &transformation->vao); |
| gl->BindVertexArray (transformation->vao); |
| } |
| |
| gl->GenBuffers (1, &transformation->vertex_buffer); |
| transformation->caps_change = TRUE; |
| } |
| |
| if (gl->GenVertexArrays) |
| gl->BindVertexArray (transformation->vao); |
| |
| if (transformation->caps_change) { |
| _upload_vertices (transformation); |
| _bind_buffer (transformation); |
| |
| if (gl->GenVertexArrays) |
| gl->BindBuffer (GL_ARRAY_BUFFER, 0); |
| } else if (!gl->GenVertexArrays) { |
| _bind_buffer (transformation); |
| } |
| |
| gl->DrawElements (GL_TRIANGLE_STRIP, 5, GL_UNSIGNED_SHORT, indices); |
| |
| 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; |
| } |