On 31 May 2018 at 00:25, Eric Anholt <e...@anholt.net> wrote:
> Tomeu Vizoso <tomeu.viz...@collabora.com> writes:
>
>> Virgl could save a lot of work converting buffers in the host side
>> between formats if Mesa supported a bunch of other formats when reading
>> pixels.
>>
>> This commit adds cases to handle specific formats so that the values
>> reported by the two calls match more closely the underlying native
>> formats.
>>
>> In GLES is important that IMPLEMENTATION_COLOR_READ_* return the native
>> format and data type because the spec only allows reading with those,
>> besides GL_RGBA or GL_RGBA_INTEGER.
>>
>> Additionally, because virgl currently doesn't implement such
>> conversions, this commit fixes several tests in
>> dEQP-GLES3.functional.fbo.color.clear.*, when using virgl in the guest
>> side.
>>
>> The logic is based on knowledge that is shared with
>> _mesa_format_matches_format_and_type() but we cannot assert that the
>> results match as we don't have all the starting information at both
>> points. So leave the assert out and hope CI comes soon to save us all.
>>
>> v2: * Let R10G10B10A2_UINT fall back to GL_RGBA_INTEGER (Eric Anholt)
>> * Assert with _mesa_format_matches_format_and_type (Eric Anholt)
>>
>> v3: * Remove the assert, as it won't be reliable (Eric Anholt)
>>
>> Signed-off-by: Tomeu Vizoso <tomeu.viz...@collabora.com>
>> ---
>> src/mesa/main/framebuffer.c | 68 +++++++++++++++++++++++--------------
>> 1 file changed, 43 insertions(+), 25 deletions(-)
>>
>> diff --git a/src/mesa/main/framebuffer.c b/src/mesa/main/framebuffer.c
>> index 8e751b453b75..b1a544b5646d 100644
>> --- a/src/mesa/main/framebuffer.c
>> +++ b/src/mesa/main/framebuffer.c
>> @@ -834,18 +834,52 @@ _mesa_get_color_read_format(struct gl_context *ctx,
>> }
>> else {
>> const mesa_format format = fb->_ColorReadBuffer->Format;
>> - const GLenum data_type = _mesa_get_format_datatype(format);
>> + GLenum data_type;
>> + GLuint comps;
>>
>> - if (format == MESA_FORMAT_B8G8R8A8_UNORM)
>> + _mesa_uncompressed_format_to_type_and_comps(format, &data_type,
>> &comps);
>> +
>> + switch (format) {
>> + case MESA_FORMAT_RGBA_UINT8:
>> + return GL_RGBA_INTEGER;
>> + case MESA_FORMAT_B8G8R8A8_UNORM:
>> return GL_BGRA;
>> - else if (format == MESA_FORMAT_B5G6R5_UNORM)
>> + case MESA_FORMAT_B5G6R5_UNORM:
>> + case MESA_FORMAT_R11G11B10_FLOAT:
>> return GL_RGB;
>> - else if (format == MESA_FORMAT_R_UNORM8)
>> + case MESA_FORMAT_RG_FLOAT32:
>> + case MESA_FORMAT_RG_FLOAT16:
>> + case MESA_FORMAT_R8G8_UNORM:
>> + return GL_RG;
>> + case MESA_FORMAT_RG_SINT32:
>> + case MESA_FORMAT_RG_UINT32:
>> + case MESA_FORMAT_RG_SINT16:
>> + case MESA_FORMAT_RG_UINT16:
>> + case MESA_FORMAT_RG_SINT8:
>> + case MESA_FORMAT_RG_UINT8:
>> + return GL_RG_INTEGER;
>> + case MESA_FORMAT_R_FLOAT32:
>> + case MESA_FORMAT_R_FLOAT16:
>> + case MESA_FORMAT_R_UNORM8:
>> return GL_RED;
>> + case MESA_FORMAT_R_SINT32:
>> + case MESA_FORMAT_R_UINT32:
>> + case MESA_FORMAT_R_SINT16:
>> + case MESA_FORMAT_R_UINT16:
>> + case MESA_FORMAT_R_SINT8:
>> + case MESA_FORMAT_R_UINT8:
>> + return GL_RED_INTEGER;
>> + default:
>> + break;
>> + }
>>
>> switch (data_type) {
>> case GL_UNSIGNED_INT:
>> + case GL_UNSIGNED_INT_2_10_10_10_REV:
>> + case GL_UNSIGNED_SHORT:
>
> Formats like MESA_FORMAT_R_UNORM16 return GL_UNSIGNED_SHORT, but they
> should be returning GL_RGBA, right? Similar for SNORM, and similar for BYTE
> cases. Maybe _mesa_format_is_integer() could help you here?
You are right that it shouldn't be GL_RGBA_INTEGER as per the current
code, but I think it should be GL_RED and not GL_RGBA.
I will add those Mesa formats to the switch case, as
_mesa_format_is_integer() isn't enough to tell.
Thanks,
Tomeu
>
>> case GL_INT:
>> + case GL_SHORT:
>> + case GL_BYTE:
>> return GL_RGBA_INTEGER;
>> default:
>> return GL_RGBA;
>
>
> _______________________________________________
> mesa-dev mailing list
> mesa-dev@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/mesa-dev
>
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/mesa-dev
