static gboolean
gst_gl_alpha_gl_start (GstGLBaseFilter * base_filter)
{
GstGLAlpha *alpha = GST_GL_ALPHA (base_filter);
if (!_create_shader (alpha))
return FALSE;
return GST_GL_BASE_FILTER_CLASS (parent_class)->gl_start (base_filter);
}
static GLuint _shader_init(const char *vs_path, const char *fs_path) {
GLuint vertex_shader, fragment_shader;
vertex_shader = _create_shader(GL_VERTEX_SHADER, vs_path);
fragment_shader = _create_shader(GL_FRAGMENT_SHADER, fs_path);
GLuint shader_program = glCreateProgram();
glAttachShader(shader_program, vertex_shader);
glAttachShader(shader_program, fragment_shader);
glLinkProgram(shader_program);
GLint status;
glGetProgramiv(shader_program, GL_LINK_STATUS, &status);
if (status == GL_FALSE) {
puts("Shader linker failure!");
GLint infoLogLength;
glGetProgramiv(shader_program, GL_INFO_LOG_LENGTH, &infoLogLength);
GLchar strInfoLog[infoLogLength];
glGetProgramInfoLog(shader_program, infoLogLength, NULL, strInfoLog);
printf("\nGLSL error: %s", strInfoLog);
return -1;
} else {
printf("Shader program linked: %d\n", shader_program);
}
glDetachShader(shader_program, vertex_shader);
glDetachShader(shader_program, fragment_shader);
return shader_program;
}
static gboolean
gst_gl_alpha_filter_texture (GstGLFilter * filter, GstGLMemory * in_tex,
GstGLMemory * out_tex)
{
GstGLAlpha *alpha = GST_GL_ALPHA (filter);
GstGLShader *shader;
if (!alpha->alpha_shader)
_create_shader (alpha);
GST_OBJECT_LOCK (alpha);
if (alpha->method == ALPHA_METHOD_SET) {
shader = alpha->alpha_shader;
gst_gl_shader_use (shader);
gst_gl_shader_set_uniform_1f (shader, "alpha", alpha->alpha);
} else {
shader = alpha->chroma_key_shader;
gst_gl_shader_use (shader);
gst_gl_shader_set_uniform_1f (shader, "cb", alpha->cb);
gst_gl_shader_set_uniform_1f (shader, "cr", alpha->cr);
gst_gl_shader_set_uniform_1f (shader, "kg", alpha->kg);
gst_gl_shader_set_uniform_1f (shader, "accept_angle_tg",
alpha->accept_angle_tg);
gst_gl_shader_set_uniform_1f (shader, "accept_angle_ctg",
alpha->accept_angle_ctg);
gst_gl_shader_set_uniform_1f (shader, "one_over_kc", alpha->one_over_kc);
gst_gl_shader_set_uniform_1f (shader, "kfgy_scale", alpha->kfgy_scale);
gst_gl_shader_set_uniform_1f (shader, "noise_level2", alpha->noise_level2);
gst_gl_shader_set_uniform_1f (shader, "smin",
0.5 - alpha->black_sensitivity / 255.0);
gst_gl_shader_set_uniform_1f (shader, "smax",
0.5 + alpha->white_sensitivity / 255.0);
}
GST_OBJECT_UNLOCK (alpha);
gst_gl_filter_render_to_target_with_shader (filter, in_tex, out_tex, shader);
return TRUE;
}