mesa: Initializes the stencil value masks to 0xFF instead of ~0u

'4.1.4 Stencil Test' section of the GL-ES 3.0 specification says:

    "In the initial state, [...] the front and back stencil mask are both set
    to the value 2^s − 1, where s is greater than or equal to the number of
    bits in the deepest stencil buffer* supported by the GL implementation."

Since the maximum supported precision for stencil buffers is 8 bits, mask
values should be initialized to 2^8 - 1 = 0xFF.

Currently, these masks are initialized to max unsigned integer (~0u), because
in OpenGL 3.0 and before, the initial mask values were:

    "In the initial state, stenciling is disabled, the front and back
    stencil reference value are both zero, the front and back stencil
    comparison functions are both ALWAYS, and the front and back
    stencil mask are both all ones."

The problem is that it causes the mask values to overflow to -1 when converted
to signed integer by glGet* APIs.

Fixes 6 dEQP failing tests:
* dEQP-GLES3.functional.state_query.integers.stencil_value_mask_getfloat
* dEQP-GLES3.functional.state_query.integers.stencil_back_value_mask_getfloat
* dEQP-GLES3.functional.state_query.integers.stencil_value_mask_separate_getfloat
* dEQP-GLES3.functional.state_query.integers.stencil_value_mask_separate_both_getfloat
* dEQP-GLES3.functional.state_query.integers.stencil_back_value_mask_separate_getfloat
* dEQP-GLES3.functional.state_query.integers.stencil_back_value_mask_separate_both_getfloat

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Depth and stencil attachments must be the same in OpenGL ES3

"9.4. FRAMEBUFFER COMPLETENESS
 ...
 Depth and stencil attachments, if present, are the same image."

Notice that this restriction is not included in the OpenGL ES2 spec.

Fixes 18 dEQP tests in:
dEQP-GLES3.functional.fbo.completeness.attachment_combinations.*

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
main: fix return GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL value

Return the proper value for two-dimensional array texture and three-dimensional
textures.

From OpenGL ES 3.0 spec, chapter 6.1.13 "Framebuffer Object Queries",
page 234:

"If pname is FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER and the texture
object named FRAMEBUFFER_ATTACHMENT_OBJECT_NAME is a layer of a
three-dimensional texture or a two-dimensional array texture, then params
will contain the number of the texture layer which contains the attached im-
age. Otherwise params will contain the value zero."

Furthermore, FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER is an alias of
FRAMEBUFFER_ATTACHMENT_TEXTURE_3D_ZOFFSET_EXT.

This patch fixes dEQP test:

dEQP-GLES3.functional.state_query.fbo.framebuffer_attachment_texture_layer

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
main: round floating-point value to nearest integer in glGetTexParameteriv()

Previously, a cast was done to convert from float to int but there
were rounding errors.

The spec specificies in Data Conversion chapter that Floating-point values are
rounded to the nearest integer.

This patch fixes the following 8 dEQP tests:

dEQP-GLES3.functional.state_query.texture.texture_2d_texture_min_lod_gettexparameteri
dEQP-GLES3.functional.state_query.texture.texture_2d_texture_max_lod_gettexparameteri
dEQP-GLES3.functional.state_query.texture.texture_3d_texture_min_lod_gettexparameteri
dEQP-GLES3.functional.state_query.texture.texture_3d_texture_max_lod_gettexparameteri
dEQP-GLES3.functional.state_query.texture.texture_2d_array_texture_min_lod_gettexparameteri
dEQP-GLES3.functional.state_query.texture.texture_2d_array_texture_max_lod_gettexparameteri
dEQP-GLES3.functional.state_query.texture.texture_cube_map_texture_min_lod_gettexparameteri
dEQP-GLES3.functional.state_query.texture.texture_cube_map_texture_max_lod_gettexparameteri

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
main: round floating-point value to nearest integer in glGetSamplerParameteriv()

Previously, a cast was done to convert from float to int but there
were rounding errors.

The spec specificies in Data Conversion chapter that Floating-point values are
rounded to the nearest integer.

This patch fixes the following 2 dEQP tests:

dEQP-GLES3.functional.state_query.sampler.sampler_texture_min_lod_getsamplerparameteri
dEQP-GLES3.functional.state_query.sampler.sampler_texture_max_lod_getsamplerparameteri

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Allows querying GL_SAMPLER_BINDING on GLES3 profile

From GLES3 specification (page 123), "The currently bound sampler may be
queried by calling GetIntegerv with pname set to
SAMPLER_BINDINGGL_SAMPLER_BINDING".

Fixes 4 dEQP tests:
* dEQP-GLES3.functional.state_query.integers.sampler_binding_getboolean
* dEQP-GLES3.functional.state_query.integers.sampler_binding_getinteger
* dEQP-GLES3.functional.state_query.integers.sampler_binding_getinteger64
* dEQP-GLES3.functional.state_query.integers.sampler_binding_getfloat

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Returns a GL_INVALID_VALUE error if num of fbos in glDeleteFramebuffers is negative

Per GLES3 manual for glDeleteFramebuffers
<https://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteFramebuffers.xhtml>,
GL_INVALID_VALUE is generated if n is negative.

Fixes 1 dEQP test:
* dEQP-GLES3.functional.negative_api.buffer.delete_framebuffers

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Returns a GL_INVALID_VALUE error if num of fbos in glDeleteRenderbuffers is negative

Per GLES3 manual for glDeleteRenderbuffers
<https://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteRenderbuffers.xhtml>,
GL_INVALID_VALUE is generated if n is negative.

Fixes 1 dEQP test:
* dEQP-GLES3.functional.negative_api.buffer.delete_renderbuffers

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Fix error reporting for some cases of incomplete FBO attachments

According to the OpenGL and OpenGL ES specs (sections
"FRAMEBUFFER COMPLETENESS" and "Whole Framebuffer Completeness"),
the image for color, depth or stencil attachments must be renderable,
otherwise the attachment is considered incomplete and we should report
GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT. Currently, we detect this
situation properly but report a different error.

This fixes the following 3 piglit tests:
dEQP-GLES3.functional.fbo.completeness.renderable.texture.color0.rgb_unsigned_int_2_10_10_10_rev
dEQP-GLES3.functional.fbo.completeness.renderable.texture.color0.rgba_unsigned_int_2_10_10_10_rev
dEQP-GLES3.functional.fbo.completeness.renderable.texture.color0.rgb16f

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
mesa: Returns a GL_INVALID_VALUE error if num of texs in glDeleteTextures is negative

Per GLES3 manual for glDeleteTextures
<https://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteTextures.xhtml>,
GL_INVALID_VALUE is generated if n is negative.

Fixes 1 dEQP test:
* dEQP-GLES3.functional.negative_api.texture.deletetextures

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>