kwin/src/backends/drm/shadowbuffer.cpp

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/*
KWin - the KDE window manager
This file is part of the KDE project.
SPDX-FileCopyrightText: 2021 Xaver Hugl <xaver.hugl@gmail.com>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "shadowbuffer.h"
#include "logging.h"
#include "drm_output.h"
namespace KWin
{
static const float vertices[] = {
-1.0f, 1.0f,
-1.0f, -1.0f,
1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f,
};
static const float texCoords[] = {
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
1.0f, 1.0f
};
ShadowBuffer::ShadowBuffer(const QSize &size, const GbmFormat &format)
: m_size(size)
{
glGenFramebuffers(1, &m_framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, m_framebuffer);
GLRenderTarget::setKWinFramebuffer(m_framebuffer);
glGenTextures(1, &m_texture);
glBindTexture(GL_TEXTURE_2D, m_texture);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat(format), size.width(), size.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_texture, 0);
if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
qCCritical(KWIN_DRM) << "Error: framebuffer not complete!";
return;
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
GLRenderTarget::setKWinFramebuffer(0);
m_vbo.reset(new GLVertexBuffer(KWin::GLVertexBuffer::Static));
m_vbo->setData(6, 2, vertices, texCoords);
}
ShadowBuffer::~ShadowBuffer()
{
glDeleteTextures(1, &m_texture);
glDeleteFramebuffers(1, &m_framebuffer);
}
void ShadowBuffer::render(DrmAbstractOutput *output)
{
const auto size = output->modeSize();
glViewport(0, 0, size.width(), size.height());
auto shader = ShaderManager::instance()->pushShader(ShaderTrait::MapTexture);
QMatrix4x4 mvpMatrix;
switch (output->transform()) {
case DrmOutput::Transform::Normal:
case DrmOutput::Transform::Flipped:
break;
case DrmOutput::Transform::Rotated90:
case DrmOutput::Transform::Flipped90:
mvpMatrix.rotate(90, 0, 0, 1);
break;
case DrmOutput::Transform::Rotated180:
case DrmOutput::Transform::Flipped180:
mvpMatrix.rotate(180, 0, 0, 1);
break;
case DrmOutput::Transform::Rotated270:
case DrmOutput::Transform::Flipped270:
mvpMatrix.rotate(270, 0, 0, 1);
break;
}
switch (output->transform()) {
case DrmOutput::Transform::Flipped:
case DrmOutput::Transform::Flipped90:
case DrmOutput::Transform::Flipped180:
case DrmOutput::Transform::Flipped270:
mvpMatrix.scale(-1, 1);
break;
default:
break;
}
shader->setUniform(GLShader::ModelViewProjectionMatrix, mvpMatrix);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
GLRenderTarget::setKWinFramebuffer(0);
glBindTexture(GL_TEXTURE_2D, m_texture);
m_vbo->render(GL_TRIANGLES);
ShaderManager::instance()->popShader();
glBindTexture(GL_TEXTURE_2D, 0);
}
void ShadowBuffer::bind()
{
glBindFramebuffer(GL_FRAMEBUFFER, m_framebuffer);
GLRenderTarget::setKWinFramebuffer(m_framebuffer);
}
bool ShadowBuffer::isComplete() const
{
return m_texture && m_framebuffer && m_vbo;
}
int ShadowBuffer::texture() const
{
return m_texture;
}
QSize ShadowBuffer::textureSize() const
{
return m_size;
}
GLint ShadowBuffer::internalFormat(const GbmFormat &format)
{
if (format.redSize <= 8 && format.greenSize <= 8 && format.blueSize <= 8) {
return GL_RGBA8;
} else if (format.redSize <= 10 && format.greenSize <= 10 && format.blueSize <= 10) {
return GL_RGB10_A2;
} else if (format.redSize <= 12 && format.greenSize <= 12 && format.blueSize <= 12) {
return GL_RGBA12;
} else {
return GL_RGBA16;
}
}
}