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Moved the pad offset and aspect ratio to a matrix so it will be added in view space and not in world space

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=794401
This commit is contained in:
Daniel Klamt 2018-04-25 16:39:34 +02:00 committed by Matthew Waters
parent b342955a64
commit b1bd804cb3
1 changed files with 14 additions and 12 deletions
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26
ext/gl/gstglvideomixer.c
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@ -570,6 +570,7 @@ struct _GstGLVideoMixerPad
gboolean geometry_change;
GLuint vertex_buffer;
gfloat m_matrix[16];
};
struct _GstGLVideoMixerPadClass
@ -616,6 +617,11 @@ gst_gl_video_mixer_pad_init (GstGLVideoMixerPad * pad)
pad->blend_function_src_alpha = DEFAULT_PAD_BLEND_FUNCTION_SRC_ALPHA;
pad->blend_function_dst_rgb = DEFAULT_PAD_BLEND_FUNCTION_DST_RGB;
pad->blend_function_dst_alpha = DEFAULT_PAD_BLEND_FUNCTION_DST_ALPHA;
memset(pad->m_matrix, 0, sizeof(gfloat) * 4 * 4);
pad->m_matrix[0] = 1.0;
pad->m_matrix[5] = 1.0;
pad->m_matrix[10] = 1.0;
pad->m_matrix[15] = 1.0;
}
static void
@ -1547,16 +1553,11 @@ gst_gl_video_mixer_callback (gpointer stuff)
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;
pad->m_matrix[0] = w;
pad->m_matrix[5] = h;
pad->m_matrix[12] = (gfloat) pad->xpos / (gfloat) out_width;
pad->m_matrix[13] = (gfloat) pad->ypos / (gfloat) out_height;
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);
@ -1565,7 +1566,6 @@ gst_gl_video_mixer_callback (gpointer stuff)
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);
@ -1583,11 +1583,13 @@ gst_gl_video_mixer_callback (gpointer stuff)
{
GstVideoAffineTransformationMeta *af_meta;
gfloat matrix[16];
gfloat af_matrix[16];
GstBuffer *buffer =
gst_video_aggregator_pad_get_current_buffer (vagg_pad);
af_meta = gst_buffer_get_video_affine_transformation_meta (buffer);
gst_gl_get_affine_transformation_meta_as_ndc_ext (af_meta, matrix);
gst_gl_get_affine_transformation_meta_as_ndc_ext (af_meta, af_matrix);
gst_gl_multiply_matrix4(af_matrix, pad->m_matrix, matrix);
gst_gl_shader_set_uniform_matrix_4fv (video_mixer->shader,
"u_transformation", 1, FALSE, matrix);
}