love/src/modules/graphics/Video.cpp

/**
 * Copyright (c) 2006-2017 LOVE Development Team
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 **/

#include "Video.h"

// LOVE
#include "Shader.h"
#include "Graphics.h"

namespace love
{
namespace graphics
{

love::Type Video::type("Video", &Drawable::type);

Video::Video(Graphics *gfx, love::video::VideoStream *stream, float pixeldensity)
	: stream(stream)
	, width(stream->getWidth() / pixeldensity)
	, height(stream->getHeight() / pixeldensity)
	, filter(Texture::defaultFilter)
{
	filter.mipmap = Texture::FILTER_NONE;

	stream->fillBackBuffer();

	for (int i = 0; i < 4; i++)
		vertices[i].color = Color(255, 255, 255, 255);

	// Vertices are ordered for use with triangle strips:
	// 0---2
	// | / |
	// 1---3
	vertices[0].x = 0.0f;
	vertices[0].y = 0.0f;
	vertices[1].x = 0.0f;
	vertices[1].y = (float) height;
	vertices[2].x = (float) width;
	vertices[2].y = 0.0f;
	vertices[3].x = (float) width;
	vertices[3].y = (float) height;

	vertices[0].s = 0.0f;
	vertices[0].t = 0.0f;
	vertices[1].s = 0.0f;
	vertices[1].t = 1.0f;
	vertices[2].s = 1.0f;
	vertices[2].t = 0.0f;
	vertices[3].s = 1.0f;
	vertices[3].t = 1.0f;

	// Create the textures using the initial frame data.
	auto frame = (const love::video::VideoStream::Frame*) stream->getFrontBuffer();

	int widths[3]  = {frame->yw, frame->cw, frame->cw};
	int heights[3] = {frame->yh, frame->ch, frame->ch};

	const unsigned char *data[3] = {frame->yplane, frame->cbplane, frame->crplane};

	Texture::Wrap wrap; // Clamp wrap mode.
	Image::Settings settings;

	for (int i = 0; i < 3; i++)
	{
		Image *img = gfx->newImage(TEXTURE_2D, PIXELFORMAT_R8, widths[i], heights[i], 1, settings);

		img->setFilter(filter);
		img->setWrap(wrap);

		size_t bpp = getPixelFormatSize(PIXELFORMAT_R8);
		size_t size = bpp * widths[i] * heights[i];

		Rect rect = {0, 0, widths[i], heights[i]};
		img->replacePixels(data[i], size, rect, 0, 0, false);

		images[i].set(img, Acquire::NORETAIN);
	}
}

Video::~Video()
{
}

love::video::VideoStream *Video::getStream()
{
	return stream;
}

void Video::draw(Graphics *gfx, const Matrix4 &m)
{
	update();

	gfx->flushStreamDraws();

	bool usingdefaultshader = Shader::isDefaultActive();
	Shader *prevdefaultshader = nullptr;

	// If we're using the default shader, substitute the video version.
	if (usingdefaultshader)
	{
		prevdefaultshader = Shader::current;
		Shader::standardShaders[Shader::STANDARD_VIDEO]->attach();
	}

	if (Shader::current != nullptr)
		Shader::current->setVideoTextures(images[0], images[1], images[2]);

	Graphics::StreamDrawRequest req;
	req.formats[0] = vertex::CommonFormat::XYf_STf_RGBAub;
	req.indexMode = vertex::TriangleIndexMode::QUADS;
	req.vertexCount = 4;

	Graphics::StreamVertexData data = gfx->requestStreamDraw(req);
	Vertex *verts = (Vertex *) data.stream[0];

	Matrix4 t(gfx->getTransform(), m);
	t.transform(verts, vertices, 4);

	Color c = toColor(gfx->getColor());

	for (int i = 0; i < 4; i++)
	{
		verts[i].s = vertices[i].s;
		verts[i].t = vertices[i].t;
		verts[i].color = c;
	}

	gfx->flushStreamDraws();

	if (usingdefaultshader && prevdefaultshader != nullptr)
		prevdefaultshader->attach();
}

void Video::update()
{
	bool bufferschanged = stream->swapBuffers();
	stream->fillBackBuffer();

	if (bufferschanged)
	{
		auto frame = (const love::video::VideoStream::Frame*) stream->getFrontBuffer();

		int widths[3]  = {frame->yw, frame->cw, frame->cw};
		int heights[3] = {frame->yh, frame->ch, frame->ch};

		const unsigned char *data[3] = {frame->yplane, frame->cbplane, frame->crplane};

		for (int i = 0; i < 3; i++)
		{
			size_t bpp = getPixelFormatSize(PIXELFORMAT_R8);
			size_t size = bpp * widths[i] * heights[i];

			Rect rect = {0, 0, widths[i], heights[i]};
			images[i]->replacePixels(data[i], size, rect, 0, 0, false);
		}
	}
}

love::audio::Source *Video::getSource()
{
	return source;
}

void Video::setSource(love::audio::Source *source)
{
	this->source = source;
}

int Video::getWidth() const
{
	return width;
}

int Video::getHeight() const
{
	return height;
}

int Video::getPixelWidth() const
{
	return stream->getWidth();
}

int Video::getPixelHeight() const
{
	return stream->getHeight();
}

void Video::setFilter(const Texture::Filter &f)
{
	for (const auto &image : images)
		image->setFilter(f);

	filter = f;
}

const Texture::Filter &Video::getFilter() const
{
	return filter;
}

} // graphics
} // love