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shm: ensure we use right gl unpack alignment (#12975)

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gl defaults to 4 and not all formats is divisible with 4 meaning its
going to pad out ouf bounds and cause issues. check if the stride is
divisible with 4 otherwise set it to 1, aka disable it.

GL_UNPACK_ALIGNMENT only takes 1,2,4,8 but formats like RGB888 has
bytesPerBlock 3.
This commit is contained in:
Tom Englund
2026-01-13 16:42:31 +01:00
committed by GitHub
parent 8d03fcc8d7
commit e43f949f8a
1 changed files with 23 additions and 2 deletions
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25
src/render/Texture.cpp
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@ -76,9 +76,19 @@ void CTexture::createFromShm(uint32_t drmFormat, uint8_t* pixels, uint32_t strid
if (format->swizzle.has_value())
swizzle(format->swizzle.value());
bool alignmentChanged = false;
if (format->bytesPerBlock != 4) {
const GLint alignment = (stride % 4 == 0) ? 4 : 1;
GLCALL(glPixelStorei(GL_UNPACK_ALIGNMENT, alignment));
alignmentChanged = true;
}
GLCALL(glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, stride / format->bytesPerBlock));
GLCALL(glTexImage2D(GL_TEXTURE_2D, 0, format->glInternalFormat ? format->glInternalFormat : format->glFormat, size_.x, size_.y, 0, format->glFormat, format->glType, pixels));
GLCALL(glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, 0));
if (alignmentChanged)
GLCALL(glPixelStorei(GL_UNPACK_ALIGNMENT, 4));
unbind();
if (m_keepDataCopy) {
@ -130,8 +140,16 @@ void CTexture::update(uint32_t drmFormat, uint8_t* pixels, uint32_t stride, cons
if (format->swizzle.has_value())
swizzle(format->swizzle.value());
damage.copy().intersect(CBox{{}, m_size}).forEachRect([&format, &stride, &pixels](const auto& rect) {
GLCALL(glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, stride / format->bytesPerBlock));
bool alignmentChanged = false;
if (format->bytesPerBlock != 4) {
const GLint alignment = (stride % 4 == 0) ? 4 : 1;
GLCALL(glPixelStorei(GL_UNPACK_ALIGNMENT, alignment));
alignmentChanged = true;
}
GLCALL(glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, stride / format->bytesPerBlock));
damage.copy().intersect(CBox{{}, m_size}).forEachRect([&format, &pixels](const auto& rect) {
GLCALL(glPixelStorei(GL_UNPACK_SKIP_PIXELS_EXT, rect.x1));
GLCALL(glPixelStorei(GL_UNPACK_SKIP_ROWS_EXT, rect.y1));
@ -140,6 +158,9 @@ void CTexture::update(uint32_t drmFormat, uint8_t* pixels, uint32_t stride, cons
GLCALL(glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x1, rect.y1, width, height, format->glFormat, format->glType, pixels));
});
if (alignmentChanged)
GLCALL(glPixelStorei(GL_UNPACK_ALIGNMENT, 4));
GLCALL(glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, 0));
GLCALL(glPixelStorei(GL_UNPACK_SKIP_PIXELS_EXT, 0));
GLCALL(glPixelStorei(GL_UNPACK_SKIP_ROWS_EXT, 0));