diff options
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 57 |
1 files changed, 52 insertions, 5 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index 49877206fea..4debcc6ecc4 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -1266,6 +1266,42 @@ instructions. If in doubt double check Direct3D documentation. LOAD dst, address, resource e.g. LOAD TEMP[0], TEMP[1], RES[0] + The 'address' is specified as unsigned integers. If the + 'address' is out of range [0...(# texels - 1)] the + result of the fetch is always 0 in all components. + As such the instruction doesn't honor address wrap + modes, in cases where that behavior is desirable + 'sample' instruction should be used. + address.w always provides an unsigned integer mipmap + level. If the value is out of the range then the + instruction always returns 0 in all components. + address.yz are ignored for buffers and 1d textures. + address.z is ignored for 1d texture arrays and 2d + textures. + For 1D texture arrays address.y provides the array + index (also as unsigned integer). If the value is + out of the range of available array indices + [0... (array size - 1)] then the opcode always returns + 0 in all components. + For 2D texture arrays address.z provides the array + index, otherwise it exhibits the same behavior as in + the case for 1D texture arrays. + The exeact semantics of the source address are presented + in the table below: + resource type X Y Z W + ------------- ------------------------ + PIPE_BUFFER x ignored + PIPE_TEXTURE_1D x mpl + PIPE_TEXTURE_2D x y mpl + PIPE_TEXTURE_3D x y z mpl + PIPE_TEXTURE_RECT x y mpl + PIPE_TEXTURE_CUBE not allowed as source + PIPE_TEXTURE_1D_ARRAY x idx mpl + PIPE_TEXTURE_2D_ARRAY x y idx mpl + + Where 'mpl' is a mipmap level and 'idx' is the + array index. + .. opcode:: LOAD_MS - Just like LOAD but allows fetch data from multi-sampled surfaces. @@ -1286,7 +1322,7 @@ instructions. If in doubt double check Direct3D documentation. e.g. SAMPLE_B TEMP[0], TEMP[1], RES[0], SAMP[0], TEMP[2].x -.. opcode:: SAMPLE_C - Similar to the SAMPLE instruction but it +.. opcode:: SAMPLE_C - Similar to the SAMPLE instruction but it performs a comparison filter. The operands to SAMPLE_C are identical to SAMPLE, except that tere is an additional float32 operand, reference value, which must be a register @@ -1337,20 +1373,31 @@ instructions. If in doubt double check Direct3D documentation. the magnitude of the deltas are half a texel. -.. opcode:: RESINFO - query the dimentions of a given input buffer. +.. opcode:: RESINFO - query the dimensions of a given input buffer. dst receives width, height, depth or array size and - total mip count (also can be slected by writemask). + number of mipmap levels. The dst can have a writemask + which will specify what info is the caller interested + in. RESINFO dst, src_mip_level, resource e.g. RESINFO TEMP[0], TEMP[1].x, RES[0] + src_mip_level is an unsigned integer scalar. If it's + out of range then returns 0 for width, height and + depth/array size but the total number of mipmap is + still returned correctly for the given resource. + The returned width, height and depth values are for + the mipmap level selected by the src_mip_level and + are in the number of texels. + For 1d texture array width is in dst.x, array size + is in dst.y and dst.zw are always 0. .. opcode:: SAMPLE_POS - query the position of a given sample. dst receives float4 (x, y, 0, 0) indicated where the sample is located. If the resource is not a multi-sample resource and not a render target, the result is 0. -.. opcode:: SAMPLE_INFO - dst receives number of components in x. - If the resource is not a multi-sample resource and +.. opcode:: SAMPLE_INFO - dst receives number of samples in x. + If the resource is not a multi-sample resource and not a render target, the result is 0. |