/* * GStreamer * Copyright (C) 2009 Julien Isorce * * 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-glvideomixer * * Composites a number of streams into a single output scene using OpenGL in * a similar fashion to compositor and videomixer. See the compositor plugin * for documentation about the #GstGLVideoMixerPad properties. * * * Examples * |[ * gst-launch-1.0 glvideomixer name=m ! glimagesink \ * videotestsrc ! video/x-raw, format=YUY2 ! m. \ * videotestsrc pattern=12 ! video/x-raw, format=I420, framerate=5/1, width=100, height=200 ! queue ! m. \ * videotestsrc ! video/x-raw, format=RGB, framerate=15/1, width=1500, height=1500 ! gleffects effect=3 ! queue ! m. \ * videotestsrc ! gleffects effect=2 ! queue ! m. \ * videotestsrc ! glfiltercube ! queue ! m. \ * videotestsrc ! gleffects effect=6 ! queue ! m. * ]| * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstglvideomixer.h" #define GST_CAT_DEFAULT gst_gl_video_mixer_debug GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); enum { PROP_0, PROP_BACKGROUND, }; #define DEFAULT_BACKGROUND GST_GL_VIDEO_MIXER_BACKGROUND_CHECKER #define DEBUG_INIT \ GST_DEBUG_CATEGORY_INIT (gst_gl_video_mixer_debug, "glvideomixer", 0, "glvideomixer element"); G_DEFINE_TYPE_WITH_CODE (GstGLVideoMixer, gst_gl_video_mixer, GST_TYPE_GL_MIXER, DEBUG_INIT); static void gst_gl_video_mixer_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_gl_video_mixer_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GstCaps *_update_caps (GstVideoAggregator * vagg, GstCaps * caps); static void gst_gl_video_mixer_reset (GstGLMixer * mixer); static gboolean gst_gl_video_mixer_init_shader (GstGLMixer * mixer, GstCaps * outcaps); static gboolean gst_gl_video_mixer_process_textures (GstGLMixer * mixer, GPtrArray * in_frames, guint out_tex); static void gst_gl_video_mixer_callback (gpointer stuff); /* *INDENT-OFF* */ /* vertex source */ static const gchar *video_mixer_v_src = "attribute vec4 a_position; \n" "attribute vec2 a_texCoord; \n" "varying vec2 v_texCoord; \n" "void main() \n" "{ \n" " gl_Position = a_position; \n" " v_texCoord = a_texCoord; \n" "}"; /* fragment source */ static const gchar *video_mixer_f_src = "#ifdef GL_ES\n" "precision mediump float;\n" "#endif\n" "uniform sampler2D texture; \n" "uniform float alpha;\n" "varying vec2 v_texCoord; \n" "void main() \n" "{ \n" " vec4 rgba = texture2D( texture, v_texCoord );\n" " gl_FragColor = vec4(rgba.rgb, rgba.a * alpha);\n" "} \n"; /* checker vertex source */ static const gchar *checker_v_src = "attribute vec4 a_position;\n" "void main()\n" "{\n" " gl_Position = a_position;\n" "}\n"; /* checker fragment source */ static const gchar *checker_f_src = "#ifdef GL_ES\n" "precision mediump float;\n" "#endif\n" "const float blocksize = 8.0;\n" "void main ()\n" "{\n" " vec4 high = vec4(0.667, 0.667, 0.667, 1.0);\n" " vec4 low = vec4(0.333, 0.333, 0.333, 1.0);\n" " if (mod(gl_FragCoord.x, blocksize * 2.0) >= blocksize) {\n" " if (mod(gl_FragCoord.y, blocksize * 2.0) >= blocksize)\n" " gl_FragColor = low;\n" " else\n" " gl_FragColor = high;\n" " } else {\n" " if (mod(gl_FragCoord.y, blocksize * 2.0) < blocksize)\n" " gl_FragColor = low;\n" " else\n" " gl_FragColor = high;\n" " }\n" "}\n"; /* *INDENT-ON* */ #define GST_TYPE_GL_VIDEO_MIXER_PAD (gst_gl_video_mixer_pad_get_type()) #define GST_GL_VIDEO_MIXER_PAD(obj) \ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_VIDEO_MIXER_PAD, GstGLVideoMixerPad)) #define GST_GL_VIDEO_MIXER_PAD_CLASS(klass) \ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_VIDEO_MIXER_PAD, GstGLVideoMixerPadClass)) #define GST_IS_GL_VIDEO_MIXER_PAD(obj) \ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_VIDEO_MIXER_PAD)) #define GST_IS_GL_VIDEO_MIXER_PAD_CLASS(klass) \ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_VIDEO_MIXER_PAD)) typedef struct _GstGLVideoMixerPad GstGLVideoMixerPad; typedef struct _GstGLVideoMixerPadClass GstGLVideoMixerPadClass; typedef struct _GstGLVideoMixerCollect GstGLVideoMixerCollect; /** * GstGLVideoMixerPad: * * The opaque #GstGLVideoMixerPad structure. */ struct _GstGLVideoMixerPad { GstGLMixerPad parent; /* < private > */ /* properties */ gint xpos, ypos; gint width, height; gdouble alpha; gboolean geometry_change; GLuint vertex_buffer; }; struct _GstGLVideoMixerPadClass { GstGLMixerPadClass parent_class; }; GType gst_gl_video_mixer_pad_get_type (void); G_DEFINE_TYPE (GstGLVideoMixerPad, gst_gl_video_mixer_pad, GST_TYPE_GL_MIXER_PAD); static void gst_gl_video_mixer_pad_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_gl_video_mixer_pad_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GstBuffer *gst_gl_video_mixer_pad_upload_buffer (GstGLMixer * mix, GstGLMixerFrameData * frame, GstBuffer * buffer); #define DEFAULT_PAD_XPOS 0 #define DEFAULT_PAD_YPOS 0 #define DEFAULT_PAD_WIDTH 0 #define DEFAULT_PAD_HEIGHT 0 #define DEFAULT_PAD_ALPHA 1.0 enum { PROP_PAD_0, PROP_PAD_XPOS, PROP_PAD_YPOS, PROP_PAD_WIDTH, PROP_PAD_HEIGHT, PROP_PAD_ALPHA }; static void gst_gl_video_mixer_pad_init (GstGLVideoMixerPad * pad) { pad->alpha = 1.0; } static void gst_gl_video_mixer_pad_class_init (GstGLVideoMixerPadClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; GstGLMixerPadClass *mix_pad_class = (GstGLMixerPadClass *) klass; gobject_class->set_property = gst_gl_video_mixer_pad_set_property; gobject_class->get_property = gst_gl_video_mixer_pad_get_property; g_object_class_install_property (gobject_class, PROP_PAD_XPOS, g_param_spec_int ("xpos", "X Position", "X Position of the picture", G_MININT, G_MAXINT, DEFAULT_PAD_XPOS, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PAD_YPOS, g_param_spec_int ("ypos", "Y Position", "Y Position of the picture", G_MININT, G_MAXINT, DEFAULT_PAD_YPOS, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PAD_WIDTH, g_param_spec_int ("width", "Width", "Width of the picture", G_MININT, G_MAXINT, DEFAULT_PAD_WIDTH, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PAD_HEIGHT, g_param_spec_int ("height", "Height", "Height of the picture", G_MININT, G_MAXINT, DEFAULT_PAD_HEIGHT, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PAD_ALPHA, g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0, DEFAULT_PAD_ALPHA, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); mix_pad_class->upload_buffer = gst_gl_video_mixer_pad_upload_buffer; } static void gst_gl_video_mixer_pad_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (object); switch (prop_id) { case PROP_PAD_XPOS: g_value_set_int (value, pad->xpos); break; case PROP_PAD_YPOS: g_value_set_int (value, pad->ypos); break; case PROP_PAD_WIDTH: g_value_set_int (value, pad->width); break; case PROP_PAD_HEIGHT: g_value_set_int (value, pad->height); break; case PROP_PAD_ALPHA: g_value_set_double (value, pad->alpha); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_gl_video_mixer_pad_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (object); GstGLMixer *mix = GST_GL_MIXER (gst_pad_get_parent (GST_PAD (pad))); switch (prop_id) { case PROP_PAD_XPOS: pad->xpos = g_value_get_int (value); pad->geometry_change = TRUE; break; case PROP_PAD_YPOS: pad->ypos = g_value_get_int (value); pad->geometry_change = TRUE; break; case PROP_PAD_WIDTH: pad->width = g_value_get_int (value); pad->geometry_change = TRUE; break; case PROP_PAD_HEIGHT: pad->height = g_value_get_int (value); pad->geometry_change = TRUE; break; case PROP_PAD_ALPHA: pad->alpha = g_value_get_double (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } gst_object_unref (mix); } static GstBuffer * gst_gl_video_mixer_pad_upload_buffer (GstGLMixer * mix, GstGLMixerFrameData * frame, GstBuffer * buffer) { GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (frame->pad); if (pad->alpha > 0.0) { return GST_GL_MIXER_PAD_CLASS (gst_gl_video_mixer_pad_parent_class)->upload_buffer (mix, frame, buffer); } return NULL; } #define GST_GL_TYPE_VIDEO_MIXER_BACKGROUND (gst_gl_video_mixer_background_get_type()) static GType gst_gl_video_mixer_background_get_type (void) { static GType mixer_background_type = 0; static const GEnumValue mixer_background[] = { {GST_GL_VIDEO_MIXER_BACKGROUND_CHECKER, "Checker pattern", "checker"}, {GST_GL_VIDEO_MIXER_BACKGROUND_BLACK, "Black", "black"}, {GST_GL_VIDEO_MIXER_BACKGROUND_WHITE, "White", "white"}, {GST_GL_VIDEO_MIXER_BACKGROUND_TRANSPARENT, "Transparent Background to enable further compositing", "transparent"}, {0, NULL, NULL}, }; if (!mixer_background_type) { mixer_background_type = g_enum_register_static ("GstGLVideoMixerBackground", mixer_background); } return mixer_background_type; } static void gst_gl_video_mixer_class_init (GstGLVideoMixerClass * klass) { GObjectClass *gobject_class; GstElementClass *element_class; GstAggregatorClass *agg_class = (GstAggregatorClass *) klass; GstVideoAggregatorClass *vagg_class = (GstVideoAggregatorClass *) klass; gobject_class = (GObjectClass *) klass; element_class = GST_ELEMENT_CLASS (klass); gobject_class->set_property = gst_gl_video_mixer_set_property; gobject_class->get_property = gst_gl_video_mixer_get_property; gst_element_class_set_metadata (element_class, "OpenGL video_mixer", "Filter/Effect/Video/Compositor", "OpenGL video_mixer", "Julien Isorce "); g_object_class_install_property (gobject_class, PROP_BACKGROUND, g_param_spec_enum ("background", "Background", "Background type", GST_GL_TYPE_VIDEO_MIXER_BACKGROUND, DEFAULT_BACKGROUND, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); GST_GL_MIXER_CLASS (klass)->set_caps = gst_gl_video_mixer_init_shader; GST_GL_MIXER_CLASS (klass)->reset = gst_gl_video_mixer_reset; GST_GL_MIXER_CLASS (klass)->process_textures = gst_gl_video_mixer_process_textures; vagg_class->update_caps = _update_caps; agg_class->sinkpads_type = GST_TYPE_GL_VIDEO_MIXER_PAD; GST_GL_BASE_MIXER_CLASS (klass)->supported_gl_api = GST_GL_API_OPENGL | GST_GL_API_OPENGL3 | GST_GL_API_GLES2; } static void gst_gl_video_mixer_init (GstGLVideoMixer * video_mixer) { video_mixer->background = DEFAULT_BACKGROUND; video_mixer->shader = NULL; video_mixer->input_frames = NULL; } static void gst_gl_video_mixer_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstGLVideoMixer *mixer = GST_GL_VIDEO_MIXER (object); switch (prop_id) { case PROP_BACKGROUND: mixer->background = g_value_get_enum (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_gl_video_mixer_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstGLVideoMixer *mixer = GST_GL_VIDEO_MIXER (object); switch (prop_id) { case PROP_BACKGROUND: g_value_set_enum (value, mixer->background); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstCaps * _update_caps (GstVideoAggregator * vagg, GstCaps * caps) { GList *l; gint best_width = -1, best_height = -1; GstVideoInfo info; GstCaps *ret = NULL; int i; caps = gst_caps_make_writable (caps); gst_video_info_from_caps (&info, caps); GST_OBJECT_LOCK (vagg); for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) { GstVideoAggregatorPad *vaggpad = l->data; GstGLVideoMixerPad *mixer_pad = GST_GL_VIDEO_MIXER_PAD (vaggpad); gint this_width, this_height; gint width, height; if (mixer_pad->width > 0) width = mixer_pad->width; else width = GST_VIDEO_INFO_WIDTH (&vaggpad->info); if (mixer_pad->height > 0) height = mixer_pad->height; else height = GST_VIDEO_INFO_HEIGHT (&vaggpad->info); if (width == 0 || height == 0) continue; this_width = width + MAX (mixer_pad->xpos, 0); this_height = height + MAX (mixer_pad->ypos, 0); if (best_width < this_width) best_width = this_width; if (best_height < this_height) best_height = this_height; } GST_OBJECT_UNLOCK (vagg); ret = gst_gl_mixer_update_caps (GST_GL_MIXER (vagg), caps); for (i = 0; i < gst_caps_get_size (ret); i++) { GstStructure *s = gst_caps_get_structure (ret, i); gst_structure_set (s, "width", G_TYPE_INT, best_width, "height", G_TYPE_INT, best_height, NULL); } return ret; } static gboolean _reset_pad_gl (GstAggregator * agg, GstAggregatorPad * aggpad, gpointer udata) { const GstGLFuncs *gl = GST_GL_BASE_MIXER (agg)->context->gl_vtable; GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (aggpad); if (pad->vertex_buffer) { gl->DeleteBuffers (1, &pad->vertex_buffer); pad->vertex_buffer = 0; } return FALSE; } static void _reset_gl (GstGLContext * context, GstGLVideoMixer * video_mixer) { const GstGLFuncs *gl = GST_GL_BASE_MIXER (video_mixer)->context->gl_vtable; if (video_mixer->vao) { gl->DeleteVertexArrays (1, &video_mixer->vao); video_mixer->vao = 0; } gst_aggregator_iterate_sinkpads (GST_AGGREGATOR (video_mixer), _reset_pad_gl, NULL); } static void gst_gl_video_mixer_reset (GstGLMixer * mixer) { GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer); GstGLContext *context = GST_GL_BASE_MIXER (mixer)->context; video_mixer->input_frames = NULL; GST_DEBUG_OBJECT (mixer, "context:%p", context); if (video_mixer->shader) gst_gl_context_del_shader (context, video_mixer->shader); video_mixer->shader = NULL; if (video_mixer->checker) gst_gl_context_del_shader (context, video_mixer->checker); video_mixer->checker = NULL; if (GST_GL_BASE_MIXER (mixer)->context) gst_gl_context_thread_add (context, (GstGLContextThreadFunc) _reset_gl, mixer); } static gboolean gst_gl_video_mixer_init_shader (GstGLMixer * mixer, GstCaps * outcaps) { GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mixer); if (video_mixer->shader) gst_gl_context_del_shader (GST_GL_BASE_MIXER (mixer)->context, video_mixer->shader); return gst_gl_context_gen_shader (GST_GL_BASE_MIXER (mixer)->context, video_mixer_v_src, video_mixer_f_src, &video_mixer->shader); } static gboolean gst_gl_video_mixer_process_textures (GstGLMixer * mix, GPtrArray * frames, guint out_tex) { GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (mix); video_mixer->input_frames = frames; gst_gl_context_use_fbo_v2 (GST_GL_BASE_MIXER (mix)->context, GST_VIDEO_INFO_WIDTH (&GST_VIDEO_AGGREGATOR (mix)->info), GST_VIDEO_INFO_HEIGHT (&GST_VIDEO_AGGREGATOR (mix)->info), mix->fbo, mix->depthbuffer, out_tex, gst_gl_video_mixer_callback, (gpointer) video_mixer); return TRUE; } static gboolean _draw_checker_background (GstGLVideoMixer * video_mixer) { GstGLMixer *mixer = GST_GL_MIXER (video_mixer); const GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable; gint attr_position_loc = 0; const GLushort indices[] = { 0, 1, 2, 0, 2, 3 }; /* *INDENT-OFF* */ gfloat v_vertices[] = { -1.0,-1.0,-1.0f, 1.0,-1.0,-1.0f, 1.0, 1.0,-1.0f, -1.0, 1.0,-1.0f, }; /* *INDENT-ON* */ if (!video_mixer->checker) { if (!gst_gl_context_gen_shader (GST_GL_BASE_MIXER (mixer)->context, checker_v_src, checker_f_src, &video_mixer->checker)) return FALSE; } gst_gl_shader_use (video_mixer->checker); attr_position_loc = gst_gl_shader_get_attribute_location (video_mixer->checker, "a_position"); if (!video_mixer->checker_vbo) { gl->GenBuffers (1, &video_mixer->checker_vbo); gl->BindBuffer (GL_ARRAY_BUFFER, video_mixer->checker_vbo); gl->BufferData (GL_ARRAY_BUFFER, 4 * 3 * sizeof (GLfloat), v_vertices, GL_STATIC_DRAW); } else { gl->BindBuffer (GL_ARRAY_BUFFER, video_mixer->checker_vbo); } gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT, GL_FALSE, 3 * sizeof (GLfloat), (void *) 0); gl->EnableVertexAttribArray (attr_position_loc); gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices); gl->DisableVertexAttribArray (attr_position_loc); gl->BindBuffer (GL_ARRAY_BUFFER, 0); return TRUE; } static gboolean _draw_background (GstGLVideoMixer * video_mixer) { GstGLMixer *mixer = GST_GL_MIXER (video_mixer); const GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable; switch (video_mixer->background) { case GST_GL_VIDEO_MIXER_BACKGROUND_BLACK: gl->ClearColor (0.0, 0.0, 0.0, 1.0); gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); break; case GST_GL_VIDEO_MIXER_BACKGROUND_WHITE: gl->ClearColor (1.0, 1.0, 1.0, 1.0); gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); break; case GST_GL_VIDEO_MIXER_BACKGROUND_TRANSPARENT: gl->ClearColor (0.0, 0.0, 0.0, 0.0); gl->Clear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); break; case GST_GL_VIDEO_MIXER_BACKGROUND_CHECKER: return _draw_checker_background (video_mixer); break; default: break; } return TRUE; } /* opengl scene, params: input texture (not the output mixer->texture) */ static void gst_gl_video_mixer_callback (gpointer stuff) { GstGLVideoMixer *video_mixer = GST_GL_VIDEO_MIXER (stuff); GstGLMixer *mixer = GST_GL_MIXER (video_mixer); GstGLFuncs *gl = GST_GL_BASE_MIXER (mixer)->context->gl_vtable; GLint attr_position_loc = 0; GLint attr_texture_loc = 0; guint out_width, out_height; const GLushort indices[] = { 0, 1, 2, 0, 2, 3 }; guint count = 0; out_width = GST_VIDEO_INFO_WIDTH (&GST_VIDEO_AGGREGATOR (stuff)->info); out_height = GST_VIDEO_INFO_HEIGHT (&GST_VIDEO_AGGREGATOR (stuff)->info); gst_gl_context_clear_shader (GST_GL_BASE_MIXER (mixer)->context); gl->BindTexture (GL_TEXTURE_2D, 0); if (gst_gl_context_get_gl_api (GST_GL_BASE_MIXER (mixer)->context) & GST_GL_API_OPENGL) gl->Disable (GL_TEXTURE_2D); gl->Disable (GL_DEPTH_TEST); gl->Disable (GL_CULL_FACE); if (gl->GenVertexArrays) { if (!video_mixer->vao) gl->GenVertexArrays (1, &video_mixer->vao); gl->BindVertexArray (video_mixer->vao); } if (!_draw_background (video_mixer)) return; gst_gl_shader_use (video_mixer->shader); attr_position_loc = gst_gl_shader_get_attribute_location (video_mixer->shader, "a_position"); attr_texture_loc = gst_gl_shader_get_attribute_location (video_mixer->shader, "a_texCoord"); gl->Enable (GL_BLEND); while (count < video_mixer->input_frames->len) { GstGLMixerFrameData *frame; GstGLVideoMixerPad *pad; guint in_tex; guint in_width, in_height; /* *INDENT-OFF* */ gfloat v_vertices[] = { -1.0,-1.0,-1.0f, 0.0f, 0.0f, 1.0,-1.0,-1.0f, 1.0f, 0.0f, 1.0, 1.0,-1.0f, 1.0f, 1.0f, -1.0, 1.0,-1.0f, 0.0f, 1.0f, }; /* *INDENT-ON* */ frame = g_ptr_array_index (video_mixer->input_frames, count); if (!frame) { GST_DEBUG ("skipping texture, null frame"); count++; continue; } pad = (GstGLVideoMixerPad *) frame->pad; in_width = GST_VIDEO_INFO_WIDTH (&GST_VIDEO_AGGREGATOR_PAD (pad)->info); in_height = GST_VIDEO_INFO_HEIGHT (&GST_VIDEO_AGGREGATOR_PAD (pad)->info); if (!frame->texture || in_width <= 0 || in_height <= 0 || pad->alpha == 0.0f) { GST_DEBUG ("skipping texture:%u frame:%p width:%u height:%u alpha:%f", frame->texture, frame, in_width, in_height, pad->alpha); count++; continue; } in_tex = frame->texture; if (pad->geometry_change || !pad->vertex_buffer) { guint pad_width, pad_height; gfloat w, h; pad_width = pad->width <= 0 ? in_width : pad->width; pad_height = pad->height <= 0 ? in_height : pad->height; w = ((gfloat) pad_width / (gfloat) out_width); h = ((gfloat) pad_height / (gfloat) out_height); /* top-left */ v_vertices[0] = v_vertices[15] = 2.0f * (gfloat) pad->xpos / (gfloat) out_width - 1.0f; /* bottom-left */ v_vertices[1] = v_vertices[6] = 2.0f * (gfloat) pad->ypos / (gfloat) out_height - 1.0f; /* top-right */ v_vertices[5] = v_vertices[10] = v_vertices[0] + 2.0f * w; /* bottom-right */ v_vertices[11] = v_vertices[16] = v_vertices[1] + 2.0f * h; GST_TRACE ("processing texture:%u dimensions:%ux%u, at %f,%f %fx%f with " "alpha:%f", in_tex, in_width, in_height, v_vertices[0], v_vertices[1], v_vertices[5], v_vertices[11], pad->alpha); if (!pad->vertex_buffer) gl->GenBuffers (1, &pad->vertex_buffer); gl->BindBuffer (GL_ARRAY_BUFFER, pad->vertex_buffer); gl->BufferData (GL_ARRAY_BUFFER, 4 * 5 * sizeof (GLfloat), v_vertices, GL_STATIC_DRAW); } else { gl->BindBuffer (GL_ARRAY_BUFFER, pad->vertex_buffer); } gl->BlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); gl->BlendEquation (GL_FUNC_ADD); gl->ActiveTexture (GL_TEXTURE0); gl->BindTexture (GL_TEXTURE_2D, in_tex); gst_gl_shader_set_uniform_1i (video_mixer->shader, "texture", 0); gst_gl_shader_set_uniform_1f (video_mixer->shader, "alpha", pad->alpha); gl->EnableVertexAttribArray (attr_position_loc); gl->EnableVertexAttribArray (attr_texture_loc); gl->VertexAttribPointer (attr_position_loc, 3, GL_FLOAT, GL_FALSE, 5 * sizeof (GLfloat), (void *) 0); gl->VertexAttribPointer (attr_texture_loc, 2, GL_FLOAT, GL_FALSE, 5 * sizeof (GLfloat), (void *) (3 * sizeof (GLfloat))); gl->DrawElements (GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices); ++count; } gl->DisableVertexAttribArray (attr_position_loc); gl->DisableVertexAttribArray (attr_texture_loc); if (gl->GenVertexArrays) gl->BindVertexArray (0); gl->BindBuffer (GL_ARRAY_BUFFER, 0); gl->BindTexture (GL_TEXTURE_2D, 0); gl->Disable (GL_BLEND); gst_gl_context_clear_shader (GST_GL_BASE_MIXER (mixer)->context); }