void post_process(
const safe_ptr<device_buffer>& background, bool straighten_alpha)
{
bool should_post_process =
supports_texture_barrier_
&& straighten_alpha
&& post_processing_;
if (!should_post_process)
return;
if (!blend_modes_)
ogl_->disable(GL_BLEND);
ogl_->disable(GL_POLYGON_STIPPLE);
ogl_->attach(*background);
background->bind(texture_id::background);
ogl_->use(*shader_);
shader_->set("background", texture_id::background);
shader_->set("post_processing", should_post_process);
shader_->set("straighten_alpha", straighten_alpha);
ogl_->viewport(0, 0, background->width(), background->height());
glBegin(GL_QUADS);
glMultiTexCoord2d(GL_TEXTURE0, 0.0, 0.0); glVertex2d(-1.0, -1.0);
glMultiTexCoord2d(GL_TEXTURE0, 1.0, 0.0); glVertex2d( 1.0, -1.0);
glMultiTexCoord2d(GL_TEXTURE0, 1.0, 1.0); glVertex2d( 1.0, 1.0);
glMultiTexCoord2d(GL_TEXTURE0, 0.0, 1.0); glVertex2d(-1.0, 1.0);
glEnd();
glTextureBarrierNV();
if (!blend_modes_)
ogl_->enable(GL_BLEND);
}
void draw(draw_params&& params)
{
static const double epsilon = 0.001;
CASPAR_ASSERT(params.pix_desc.planes.size() == params.textures.size());
if(params.textures.empty() || !params.background)
return;
if(params.transform.opacity < epsilon)
return;
if(!std::all_of(params.textures.begin(), params.textures.end(), std::mem_fn(&device_buffer::ready)))
{
CASPAR_LOG(trace) << L"[image_mixer] Performance warning. Host to device transfer not complete, GPU will be stalled";
ogl_->yield(); // Try to give it some more time.
}
// Bind textures
for(size_t n = 0; n < params.textures.size(); ++n)
params.textures[n]->bind(n);
if(params.local_key)
params.local_key->bind(texture_id::local_key);
if(params.layer_key)
params.layer_key->bind(texture_id::layer_key);
// Setup shader
ogl_->use(*shader_);
shader_->set("plane[0]", texture_id::plane0);
shader_->set("plane[1]", texture_id::plane1);
shader_->set("plane[2]", texture_id::plane2);
shader_->set("plane[3]", texture_id::plane3);
shader_->set("local_key", texture_id::local_key);
shader_->set("layer_key", texture_id::layer_key);
shader_->set("is_hd", params.pix_desc.planes.at(0).height > 700 ? 1 : 0);
shader_->set("has_local_key", bool(params.local_key));
shader_->set("has_layer_key", bool(params.layer_key));
shader_->set("pixel_format", params.pix_desc.pix_fmt);
shader_->set("opacity", params.transform.is_key ? 1.0 : params.transform.opacity);
shader_->set("post_processing", false);
shader_->set("chroma_mode", params.blend_mode.chroma.key == chroma::green ? 1 : (params.blend_mode.chroma.key == chroma::blue ? 2 : 0));
shader_->set("chroma_blend", params.blend_mode.chroma.threshold, params.blend_mode.chroma.softness);
shader_->set("chroma_spill", params.blend_mode.chroma.spill);
// shader_->set("chroma.key", ((params.blend_mode.chroma.key >> 24) && 0xff)/255.0f,
// ((params.blend_mode.chroma.key >> 16) && 0xff)/255.0f,
// (params.blend_mode.chroma.key & 0xff)/255.0f);
// if (params.blend_mode.chroma.key != chroma::none)
// {
// shader_->set("chroma.threshold", params.blend_mode.chroma.threshold);
// shader_->set("chroma.softness", params.blend_mode.chroma.softness);
// shader_->set("chroma.blur", params.blend_mode.chroma.blur);
// shader_->set("chroma.spill", params.blend_mode.chroma.spill);
// shader_->set("chroma.show_mask", params.blend_mode.chroma.show_mask);
// }
// Setup blend_func
if(params.transform.is_key)
params.blend_mode = blend_mode::normal;
if(blend_modes_)
{
params.background->bind(texture_id::background);
shader_->set("background", texture_id::background);
shader_->set("blend_mode", params.blend_mode.mode);
shader_->set("keyer", params.keyer);
}
else
{
switch(params.keyer)
{
case keyer::additive:
ogl_->blend_func(GL_ONE, GL_ONE);
break;
case keyer::linear:
default:
ogl_->blend_func(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
}
}
// Setup image-adjustements
if(params.transform.levels.min_input > epsilon ||
params.transform.levels.max_input < 1.0-epsilon ||
params.transform.levels.min_output > epsilon ||
params.transform.levels.max_output < 1.0-epsilon ||
std::abs(params.transform.levels.gamma - 1.0) > epsilon)
{
shader_->set("levels", true);
shader_->set("min_input", params.transform.levels.min_input);
shader_->set("max_input", params.transform.levels.max_input);
shader_->set("min_output", params.transform.levels.min_output);
shader_->set("max_output", params.transform.levels.max_output);
shader_->set("gamma", params.transform.levels.gamma);
}
else
shader_->set("levels", false);
if(std::abs(params.transform.brightness - 1.0) > epsilon ||
std::abs(params.transform.saturation - 1.0) > epsilon ||
std::abs(params.transform.contrast - 1.0) > epsilon)
{
shader_->set("csb", true);
shader_->set("brt", params.transform.brightness);
shader_->set("sat", params.transform.saturation);
shader_->set("con", params.transform.contrast);
}
else
shader_->set("csb", false);
// Setup interlacing
if(params.transform.field_mode == core::field_mode::progressive)
ogl_->disable(GL_POLYGON_STIPPLE);
else
{
ogl_->enable(GL_POLYGON_STIPPLE);
if(params.transform.field_mode == core::field_mode::upper)
ogl_->stipple_pattern(upper_pattern);
else if(params.transform.field_mode == core::field_mode::lower)
ogl_->stipple_pattern(lower_pattern);
}
// Setup drawing area
ogl_->viewport(0, 0, params.background->width(), params.background->height());
auto m_p = params.transform.clip_translation;
auto m_s = params.transform.clip_scale;
bool scissor = m_p[0] > std::numeric_limits<double>::epsilon() || m_p[1] > std::numeric_limits<double>::epsilon() ||
m_s[0] < (1.0 - std::numeric_limits<double>::epsilon()) || m_s[1] < (1.0 - std::numeric_limits<double>::epsilon());
if(scissor)
{
double w = static_cast<double>(params.background->width());
double h = static_cast<double>(params.background->height());
ogl_->enable(GL_SCISSOR_TEST);
ogl_->scissor(static_cast<size_t>(m_p[0]*w), static_cast<size_t>(m_p[1]*h), static_cast<size_t>(m_s[0]*w), static_cast<size_t>(m_s[1]*h));
}
auto f_p = params.transform.fill_translation;
auto f_s = params.transform.fill_scale;
// Set render target
ogl_->attach(*params.background);
// Draw
/*
GL_TEXTURE0 are texture coordinates to the source material, what will be rendered with this call. These are always set to the whole thing.
GL_TEXTURE1 are texture coordinates to background- / key-material, that which will have to be taken in consideration when blending. These are set to the rectangle over which the source will be rendered
*/
glBegin(GL_QUADS);
glMultiTexCoord2d(GL_TEXTURE0, 0.0, 0.0); glMultiTexCoord2d(GL_TEXTURE1, f_p[0] , f_p[1] ); glVertex2d( f_p[0] *2.0-1.0, f_p[1] *2.0-1.0);
glMultiTexCoord2d(GL_TEXTURE0, 1.0, 0.0); glMultiTexCoord2d(GL_TEXTURE1, (f_p[0]+f_s[0]), f_p[1] ); glVertex2d((f_p[0]+f_s[0])*2.0-1.0, f_p[1] *2.0-1.0);
glMultiTexCoord2d(GL_TEXTURE0, 1.0, 1.0); glMultiTexCoord2d(GL_TEXTURE1, (f_p[0]+f_s[0]), (f_p[1]+f_s[1])); glVertex2d((f_p[0]+f_s[0])*2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);
glMultiTexCoord2d(GL_TEXTURE0, 0.0, 1.0); glMultiTexCoord2d(GL_TEXTURE1, f_p[0] , (f_p[1]+f_s[1])); glVertex2d( f_p[0] *2.0-1.0, (f_p[1]+f_s[1])*2.0-1.0);
glEnd();
// Cleanup
ogl_->disable(GL_SCISSOR_TEST);
params.textures.clear();
ogl_->yield(); // Return resources to pool as early as possible.
if(blend_modes_)
{
// http://www.opengl.org/registry/specs/NV/texture_barrier.txt
// This allows us to use framebuffer (background) both as source and target while blending.
glTextureBarrierNV();
}
}