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[client] egl: force DMA copy into texture in on_frame

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This commit forces the DMA'd memory to be copied into the texture in
the EGL on_frame handler. This avoids tearing when the LG host inevitably
updates the underlying memory. We need an additional copy inside the GPU,
but this is cheap compared to copying from system memory.

We could have used logic to lock the memory buffer, but that would require
performing DMA on every frame, which wastes memory bandwidth. This
manifests as reduced frame rate when moving the mouse compared to the
non-DMA implementation.

We also keep multiple EGLImages, one for each DMA fd, to avoid issues
with the OpenGL driver.
This commit is contained in:
Quantum 2021-02-05 01:37:48 -05:00 committed by Geoffrey McRae
parent 62b27760ea
commit 30a888711b
1 changed files with 102 additions and 26 deletions
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88
client/renderers/EGL/texture.c
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@ -79,6 +79,18 @@ struct EGL_Texture
int bufferCount;
GLuint tex;
struct Buffer buf[BUFFER_COUNT];
size_t dmaImageCount;
size_t dmaImageUsed;
struct
{
int fd;
EGLImage image;
}
* dmaImages;
GLuint dmaFBO;
GLuint dmaTex;
};
bool egl_texture_init(EGL_Texture ** texture, EGLDisplay * display)
@ -121,6 +133,10 @@ void egl_texture_free(EGL_Texture ** texture)
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glDeleteTextures(1, &(*texture)->tex);
for (size_t i = 0; i < (*texture)->dmaImageUsed; ++i)
eglDestroyImage((*texture)->display, (*texture)->dmaImages[i].image);
free((*texture)->dmaImages);
free(*texture);
*texture = NULL;
}
@ -248,7 +264,15 @@ bool egl_texture_setup(EGL_Texture * texture, enum EGL_PixelFormat pixFmt, size_
}
if (useDMA)
{
if (texture->dmaFBO)
glDeleteFramebuffers(1, &texture->dmaFBO);
if (texture->dmaTex)
glDeleteTextures(1, &texture->dmaTex);
glGenFramebuffers(1, &texture->dmaFBO);
glGenTextures(1, &texture->dmaTex);
return true;
}
glBindTexture(GL_TEXTURE_2D, texture->tex);
glTexImage2D(GL_TEXTURE_2D, 0, texture->intFormat, texture->width,
@ -365,6 +389,19 @@ bool egl_texture_update_from_dma(EGL_Texture * texture, const FrameBuffer * fram
return true;
}
EGLImage image = EGL_NO_IMAGE;
for (int i = 0; i < texture->dmaImageUsed; ++i)
{
if (texture->dmaImages[i].fd == dmaFd)
{
image = texture->dmaImages[i].image;
break;
}
}
if (image == EGL_NO_IMAGE)
{
EGLAttrib const attribs[] =
{
EGL_WIDTH , texture->width,
@ -377,7 +414,7 @@ bool egl_texture_update_from_dma(EGL_Texture * texture, const FrameBuffer * fram
};
/* create the image backed by the dma buffer */
EGLImage image = eglCreateImage(
image = eglCreateImage(
texture->display,
EGL_NO_CONTEXT,
EGL_LINUX_DMA_BUF_EXT,
@ -391,15 +428,54 @@ bool egl_texture_update_from_dma(EGL_Texture * texture, const FrameBuffer * fram
return false;
}
/* bind the texture and initiate the transfer */
glBindTexture(GL_TEXTURE_2D, texture->tex);
g_egl_dynProcs.glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image);
if (texture->dmaImageUsed == texture->dmaImageCount)
{
size_t newCount = texture->dmaImageCount * 2 + 2;
void * new = realloc(texture->dmaImages, newCount * sizeof *texture->dmaImages);
if (!new)
{
DEBUG_EGL_ERROR("Failed to allocate memory");
eglDestroyImage(texture->display, image);
return false;
}
texture->dmaImageCount = newCount;
texture->dmaImages = new;
}
const size_t index = texture->dmaImageUsed++;
texture->dmaImages[index].fd = dmaFd;
texture->dmaImages[index].image = image;
}
/* wait for completion */
framebuffer_wait(frame, texture->height * texture->stride);
/* destroy the image to prevent future writes corrupting the display image */
eglDestroyImage(texture->display, image);
glBindTexture(GL_TEXTURE_2D, texture->dmaTex);
g_egl_dynProcs.glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image);
glBindFramebuffer(GL_FRAMEBUFFER, texture->dmaFBO);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture->dmaTex, 0);
glBindTexture(GL_TEXTURE_2D, texture->tex);
glCopyTexImage2D(GL_TEXTURE_2D, 0, texture->intFormat, 0, 0, texture->width, texture->height, 0);
GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
glFlush();
switch (glClientWaitSync(fence, 0, 10000000)) // 10ms
{
case GL_ALREADY_SIGNALED:
case GL_CONDITION_SATISFIED:
break;
case GL_TIMEOUT_EXPIRED:
egl_warn_slow();
break;
case GL_WAIT_FAILED:
case GL_INVALID_VALUE:
DEBUG_EGL_ERROR("glClientWaitSync failed");
}
atomic_fetch_add_explicit(&texture->state.w, 1, memory_order_release);
return true;