[Mesa-dev] [PATCH] gbm: Add gbm_bo_write entry point
Kristian Høgsberg
krh at bitplanet.net
Thu May 3 07:56:01 PDT 2012
On Thu, May 3, 2012 at 7:47 AM, Jakob Bornecrantz <jakob at vmware.com> wrote:
> Hi Kristian,
>
> s/gbm_bo_write/gbm_bo_write_to_cursor/g and make fail on anything
> other then cursors and I'm happy. Not making it just happen
> to work on some hardware really sucks for those that it doesn't
> work on because people will expect it to work.
I think we have a good compromise the way the patch is. I don't want
to restrict the write entrypoint to only cursors. Not because I think
it should work with generic gbm bos, but becase I don't want to
preclude gbm_bo_write from working with a future similar restricted,
special case bo type.
Kristian
> Cheers, Jakob.
>
> ----- Original Message -----
>> This new gbm entry point allows writing data into a gbm bo. The bo
>> has to be created with the GBM_BO_USE_WRITE flag, and it's only
>> required to work for GBM_BO_USE_CURSOR_64X64 bos.
>>
>> The gbm API is designed to be the glue layer between EGL and KMS, but
>> there was never a mechanism initialize a buffer suitable for use with
>> KMS hw cursors. The hw cursor bo is typically not compatible with
>> anything EGL can render to, and thus there's no way to get data into
>> such a bo.
>>
>> gbm_bo_write() fills that gap while staying out of the efficient
>> cpu->gpu pixel transfer business.
>> ---
>> include/GL/internal/dri_interface.h | 10 +++++++++-
>> src/gbm/backends/dri/gbm_dri.c | 18 ++++++++++++++++++
>> src/gbm/main/gbm.c | 19 +++++++++++++++++++
>> src/gbm/main/gbm.h | 9 +++++++++
>> src/gbm/main/gbmint.h | 1 +
>> src/mesa/drivers/dri/intel/intel_screen.c | 24
>> ++++++++++++++++++++++--
>> 6 files changed, 78 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/GL/internal/dri_interface.h
>> b/include/GL/internal/dri_interface.h
>> index eafbe10..e37917e 100644
>> --- a/include/GL/internal/dri_interface.h
>> +++ b/include/GL/internal/dri_interface.h
>> @@ -894,7 +894,7 @@ struct __DRIdri2ExtensionRec {
>> * extensions.
>> */
>> #define __DRI_IMAGE "DRI_IMAGE"
>> -#define __DRI_IMAGE_VERSION 3
>> +#define __DRI_IMAGE_VERSION 4
>>
>> /**
>> * These formats correspond to the similarly named MESA_FORMAT_*
>> @@ -911,6 +911,7 @@ struct __DRIdri2ExtensionRec {
>> #define __DRI_IMAGE_USE_SHARE 0x0001
>> #define __DRI_IMAGE_USE_SCANOUT 0x0002
>> #define __DRI_IMAGE_USE_CURSOR 0x0004
>> +#define __DRI_IMAGE_USE_WRITE 0x0008
>>
>> /**
>> * queryImage attributes
>> @@ -955,6 +956,13 @@ struct __DRIimageExtensionRec {
>> * \since 2
>> */
>> GLboolean (*validateUsage)(__DRIimage *image, unsigned int use);
>> +
>> + /**
>> + * Write data into image.
>> + *
>> + * \since 4
>> + */
>> + int (*write)(__DRIimage *image, const void *buf, size_t count);
>> };
>>
>>
>> diff --git a/src/gbm/backends/dri/gbm_dri.c
>> b/src/gbm/backends/dri/gbm_dri.c
>> index 4df6e8f..e5ddfb6 100644
>> --- a/src/gbm/backends/dri/gbm_dri.c
>> +++ b/src/gbm/backends/dri/gbm_dri.c
>> @@ -291,6 +291,18 @@ gbm_dri_is_format_supported(struct gbm_device
>> *gbm,
>> return 1;
>> }
>>
>> +static int
>> +gbm_dri_bo_write(struct gbm_bo *_bo, const void *buf, size_t count)
>> +{
>> + struct gbm_dri_device *dri = gbm_dri_device(_bo->gbm);
>> + struct gbm_dri_bo *bo = gbm_dri_bo(_bo);
>> +
>> + if (dri->image->base.version < 4)
>> + return -1;
>> +
>> + return dri->image->write(bo->image, buf, count);
>> +}
>> +
>> static void
>> gbm_dri_bo_destroy(struct gbm_bo *_bo)
>> {
>> @@ -390,6 +402,9 @@ gbm_dri_bo_create(struct gbm_device *gbm,
>> int dri_format;
>> unsigned dri_use = 0;
>>
>> + if (dri->image->base.version < 4 && (usage & GBM_BO_USE_WRITE))
>> + return NULL;
>> +
>> bo = calloc(1, sizeof *bo);
>> if (bo == NULL)
>> return NULL;
>> @@ -421,6 +436,8 @@ gbm_dri_bo_create(struct gbm_device *gbm,
>> dri_use |= __DRI_IMAGE_USE_SCANOUT;
>> if (usage & GBM_BO_USE_CURSOR_64X64)
>> dri_use |= __DRI_IMAGE_USE_CURSOR;
>> + if (usage & GBM_BO_USE_WRITE)
>> + dri_use |= __DRI_IMAGE_USE_WRITE;
>>
>> bo->image =
>> dri->image->createImage(dri->screen,
>> @@ -491,6 +508,7 @@ dri_device_create(int fd)
>> dri->base.base.bo_create = gbm_dri_bo_create;
>> dri->base.base.bo_create_from_egl_image =
>> gbm_dri_bo_create_from_egl_image;
>> dri->base.base.is_format_supported = gbm_dri_is_format_supported;
>> + dri->base.base.bo_write = gbm_dri_bo_write;
>> dri->base.base.bo_destroy = gbm_dri_bo_destroy;
>> dri->base.base.destroy = dri_destroy;
>> dri->base.base.surface_create = gbm_dri_surface_create;
>> diff --git a/src/gbm/main/gbm.c b/src/gbm/main/gbm.c
>> index 987e965..3994f86 100644
>> --- a/src/gbm/main/gbm.c
>> +++ b/src/gbm/main/gbm.c
>> @@ -231,6 +231,25 @@ gbm_bo_get_handle(struct gbm_bo *bo)
>> return bo->handle;
>> }
>>
>> +/** Write data into the buffer object
>> + *
>> + * If the buffer object was created with the GBM_BO_USE_WRITE flag,
>> + * this function can used to write data into the buffer object. The
>> + * data is copied directly into the object and it's the
>> responsiblity
>> + * of the caller to make sure the data represents valid pixel data,
>> + * according to the width, height, stride and format of the buffer
>> object.
>> + *
>> + * \param bo The buffer object
>> + * \param buf The data to write
>> + * \param count The number of bytes to write
>> + * \return Returns -1 on error, 0 otherwise
>> + */
>> +GBM_EXPORT int
>> +gbm_bo_write(struct gbm_bo *bo, const void *buf, size_t count)
>> +{
>> + return bo->gbm->bo_write(bo, buf, count);
>> +}
>> +
>> /** Get the gbm device used to create the buffer object
>> *
>> * \param bo The buffer object
>> diff --git a/src/gbm/main/gbm.h b/src/gbm/main/gbm.h
>> index cf3d475..af5dc5a 100644
>> --- a/src/gbm/main/gbm.h
>> +++ b/src/gbm/main/gbm.h
>> @@ -201,6 +201,12 @@ enum gbm_bo_flags {
>> * as the storage for a color buffer
>> */
>> GBM_BO_USE_RENDERING = (1 << 2),
>> + /**
>> + * Buffer can be used for gbm_bo_write. This is guaranteed to
>> work
>> + * with GBM_BO_USE_CURSOR_64X64. but may not work for other
>> + * combinations.
>> + */
>> + GBM_BO_USE_WRITE = (1 << 3),
>> };
>>
>> int
>> @@ -248,6 +254,9 @@ gbm_bo_get_device(struct gbm_bo *bo);
>> union gbm_bo_handle
>> gbm_bo_get_handle(struct gbm_bo *bo);
>>
>> +int
>> +gbm_bo_write(struct gbm_bo *bo, const void *buf, size_t count);
>> +
>> void
>> gbm_bo_set_user_data(struct gbm_bo *bo, void *data,
>> void (*destroy_user_data)(struct gbm_bo *, void *));
>> diff --git a/src/gbm/main/gbmint.h b/src/gbm/main/gbmint.h
>> index 0e98bdf..8eb8671 100644
>> --- a/src/gbm/main/gbmint.h
>> +++ b/src/gbm/main/gbmint.h
>> @@ -70,6 +70,7 @@ struct gbm_device {
>> void *egl_dpy, void
>> *egl_img,
>> uint32_t width,
>> uint32_t height,
>> uint32_t usage);
>> + int (*bo_write)(struct gbm_bo *bo, const void *buf, size_t data);
>> void (*bo_destroy)(struct gbm_bo *bo);
>>
>> struct gbm_surface *(*surface_create)(struct gbm_device *gbm,
>> diff --git a/src/mesa/drivers/dri/intel/intel_screen.c
>> b/src/mesa/drivers/dri/intel/intel_screen.c
>> index 9db5606..e945d14 100644
>> --- a/src/mesa/drivers/dri/intel/intel_screen.c
>> +++ b/src/mesa/drivers/dri/intel/intel_screen.c
>> @@ -305,6 +305,11 @@ intel_create_image(__DRIscreen *screen,
>> tiling = I915_TILING_NONE;
>> }
>>
>> + /* We only support write for cursor drm images */
>> + if ((use & __DRI_IMAGE_USE_WRITE) &&
>> + use != (__DRI_IMAGE_USE_WRITE | __DRI_IMAGE_USE_CURSOR))
>> + return NULL;
>> +
>> image = CALLOC(sizeof *image);
>> if (image == NULL)
>> return NULL;
>> @@ -411,15 +416,30 @@ intel_validate_usage(__DRIimage *image,
>> unsigned int use)
>> return GL_TRUE;
>> }
>>
>> +static int
>> +intel_image_write(__DRIimage *image, const void *buf, size_t count)
>> +{
>> + if (image->region->map_refcount)
>> + return -1;
>> + /* if use != WRITE || region->map_refcount; return -1; */
>> +
>> + drm_intel_bo_map(image->region->bo, true);
>> + memcpy(image->region->bo->virtual, buf, count);
>> + drm_intel_bo_unmap(image->region->bo);
>> +
>> + return 0;
>> +}
>> +
>> static struct __DRIimageExtensionRec intelImageExtension = {
>> - { __DRI_IMAGE, 3 },
>> + { __DRI_IMAGE, 4 },
>> intel_create_image_from_name,
>> intel_create_image_from_renderbuffer,
>> intel_destroy_image,
>> intel_create_image,
>> intel_query_image,
>> intel_dup_image,
>> - intel_validate_usage
>> + intel_validate_usage,
>> + intel_image_write
>> };
>>
>> static const __DRIextension *intelScreenExtensions[] = {
>> --
>> 1.7.10
>>
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>>
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