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glvideomixer: add support for the affine transformation meta

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This commit is contained in:
Matthew Waters 2016-03-23 03:16:11 +00:00
parent 71877db25f
commit f2c2717ac7
1 changed files with 28 additions and 13 deletions
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41
ext/gl/gstglvideomixer.c
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@ -43,6 +43,8 @@
#include "config.h"
#endif
#include <gst/video/gstvideoaffinetransformationmeta.h>
#include "gstglvideomixer.h"
#include "gstglmixerbin.h"
@ -472,15 +474,6 @@ static gboolean gst_gl_video_mixer_process_textures (GstGLMixer * mixer,
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 =
@ -489,10 +482,10 @@ static const gchar *video_mixer_f_src =
"#endif\n"
"uniform sampler2D texture; \n"
"uniform float alpha;\n"
"varying vec2 v_texCoord; \n"
"varying vec2 v_texcoord; \n"
"void main() \n"
"{ \n"
" vec4 rgba = texture2D( texture, v_texCoord );\n"
" vec4 rgba = texture2D(texture, v_texcoord);\n"
" gl_FragColor = vec4(rgba.rgb, rgba.a * alpha);\n"
"} \n";
@ -1141,7 +1134,8 @@ gst_gl_video_mixer_init_shader (GstGLMixer * mixer, GstCaps * outcaps)
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);
gst_gl_shader_string_vertex_mat4_texture_transform,
video_mixer_f_src, &video_mixer->shader);
}
static gboolean
@ -1371,6 +1365,13 @@ _set_blend_state (GstGLVideoMixer * video_mixer, GstGLVideoMixerPad * mix_pad)
return TRUE;
}
static const gfloat identity_matrix[] = {
1.0f, 0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f,
};
/* opengl scene, params: input texture (not the output mixer->texture) */
static void
gst_gl_video_mixer_callback (gpointer stuff)
@ -1407,7 +1408,7 @@ gst_gl_video_mixer_callback (gpointer stuff)
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");
gst_gl_shader_get_attribute_location (video_mixer->shader, "a_texcoord");
gl->Enable (GL_BLEND);
@ -1416,6 +1417,7 @@ gst_gl_video_mixer_callback (gpointer stuff)
while (walk) {
GstGLMixerPad *mix_pad = walk->data;
GstGLVideoMixerPad *pad = walk->data;
GstVideoAggregatorPad *vagg_pad = walk->data;
GstVideoInfo *v_info;
guint in_tex;
guint in_width, in_height;
@ -1495,6 +1497,19 @@ gst_gl_video_mixer_callback (gpointer stuff)
gst_gl_shader_set_uniform_1i (video_mixer->shader, "texture", 0);
gst_gl_shader_set_uniform_1f (video_mixer->shader, "alpha", pad->alpha);
{
GstVideoAffineTransformationMeta *af_meta;
af_meta =
gst_buffer_get_video_affine_transformation_meta (vagg_pad->buffer);
if (af_meta)
gst_gl_shader_set_uniform_matrix_4fv (video_mixer->shader,
"u_transformation", 1, FALSE, af_meta->matrix);
else
gst_gl_shader_set_uniform_matrix_4fv (video_mixer->shader,
"u_transformation", 1, FALSE, identity_matrix);
}
gl->EnableVertexAttribArray (attr_position_loc);
gl->EnableVertexAttribArray (attr_texture_loc);