diff options
Diffstat (limited to 'src/panfrost/encoder/pan_texture.c')
| -rw-r--r-- | src/panfrost/encoder/pan_texture.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/src/panfrost/encoder/pan_texture.c b/src/panfrost/encoder/pan_texture.c index 8e4b00e9055..0c92464af08 100644 --- a/src/panfrost/encoder/pan_texture.c +++ b/src/panfrost/encoder/pan_texture.c @@ -26,8 +26,222 @@ */ #include "util/macros.h" +#include "util/u_math.h" #include "pan_texture.h" +/* Generates a texture descriptor. Ideally, descriptors are immutable after the + * texture is created, so we can keep these hanging around in GPU memory in a + * dedicated BO and not have to worry. In practice there are some minor gotchas + * with this (the driver sometimes will change the format of a texture on the + * fly for compression) but it's fast enough to just regenerate the descriptor + * in those cases, rather than monkeypatching at drawtime. + * + * A texture descriptor consists of a 32-byte mali_texture_descriptor structure + * followed by a variable number of pointers. Due to this variance and + * potentially large size, we actually upload directly rather than returning + * the descriptor. Whether the user does a copy themselves or not is irrelevant + * to us here. + */ + +/* Check if we need to set a custom stride by computing the "expected" + * stride and comparing it to what the user actually wants. Only applies + * to linear textures, since tiled/compressed textures have strict + * alignment requirements for their strides as it is */ + +static bool +panfrost_needs_explicit_stride( + struct panfrost_slice *slices, + uint16_t width, + unsigned first_level, unsigned last_level, + unsigned bytes_per_pixel) +{ + for (unsigned l = first_level; l <= last_level; ++l) { + unsigned actual = slices[l].stride; + unsigned expected = u_minify(width, l) * bytes_per_pixel; + + if (actual != expected) + return true; + } + + return false; +} + +/* A Scalable Texture Compression (ASTC) corresponds to just a few texture type + * in the hardware, but in fact can be parametrized to have various widths and + * heights for the so-called "stretch factor". It turns out these parameters + * are stuffed in the bottom bits of the payload pointers. This functions + * computes these magic stuffing constants based on the ASTC format in use. The + * constant in a given dimension is 3-bits, and two are stored side-by-side for + * each active dimension. + */ + +static unsigned +panfrost_astc_stretch(unsigned dim) +{ + assert(dim >= 4 && dim <= 12); + return MIN2(dim, 11) - 4; +} + +/* Texture addresses are tagged with information about AFBC (colour AFBC?) xor + * ASTC (stretch factor) if in use. */ + +static unsigned +panfrost_compression_tag( + const struct util_format_description *desc, + enum mali_format format, enum mali_texture_layout layout) +{ + if (layout == MALI_TEXTURE_AFBC) + return util_format_has_depth(desc) ? 0x0 : 0x1; + else if (format == MALI_ASTC_HDR_SUPP || format == MALI_ASTC_SRGB_SUPP) + return (panfrost_astc_stretch(desc->block.height) << 3) | + panfrost_astc_stretch(desc->block.width); + else + return 0; +} + + +/* Cubemaps have 6 faces as "layers" in between each actual layer. We + * need to fix this up. TODO: logic wrong in the asserted out cases ... + * can they happen, perhaps from cubemap arrays? */ + +static void +panfrost_adjust_cube_dimensions( + unsigned *first_face, unsigned *last_face, + unsigned *first_layer, unsigned *last_layer) +{ + *first_face = *first_layer % 6; + *last_face = *last_layer % 6; + *first_layer /= 6; + *last_layer /= 6; + + assert((*first_layer == *last_layer) || (*first_face == 0 && *last_face == 5)); +} + +/* Following the texture descriptor is a number of pointers. How many? */ + +static unsigned +panfrost_texture_num_elements( + unsigned first_level, unsigned last_level, + unsigned first_layer, unsigned last_layer, + bool is_cube, bool manual_stride) +{ + unsigned first_face = 0, last_face = 0; + + if (is_cube) { + panfrost_adjust_cube_dimensions(&first_face, &last_face, + &first_layer, &last_layer); + } + + unsigned levels = 1 + last_level - first_level; + unsigned layers = 1 + last_layer - first_layer; + unsigned faces = 1 + last_face - first_face; + unsigned num_elements = levels * layers * faces; + + if (manual_stride) + num_elements *= 2; + + return num_elements; +} + +/* Conservative estimate of the size of the texture descriptor a priori. + * Average case, size equal to the actual size. Worst case, off by 2x (if + * a manual stride is not needed on a linear texture). Returned value + * must be greater than or equal to the actual size, so it's safe to use + * as an allocation amount */ + +unsigned +panfrost_estimate_texture_size( + unsigned first_level, unsigned last_level, + unsigned first_layer, unsigned last_layer, + enum mali_texture_type type, enum mali_texture_layout layout) +{ + /* Assume worst case */ + unsigned manual_stride = (layout == MALI_TEXTURE_LINEAR); + + unsigned elements = panfrost_texture_num_elements( + first_level, last_level, + first_layer, last_layer, + type == MALI_TEX_CUBE, manual_stride); + + return sizeof(struct mali_texture_descriptor) + + sizeof(mali_ptr) * elements; +} + +void +panfrost_new_texture( + void *out, + uint16_t width, uint16_t height, + uint16_t depth, uint16_t array_size, + enum pipe_format format, + enum mali_texture_type type, + enum mali_texture_layout layout, + unsigned first_level, unsigned last_level, + unsigned first_layer, unsigned last_layer, + unsigned cube_stride, + unsigned swizzle, + mali_ptr base, + struct panfrost_slice *slices) +{ + const struct util_format_description *desc = + util_format_description(format); + + unsigned bytes_per_pixel = util_format_get_blocksize(format); + + enum mali_format mali_format = panfrost_find_format(desc); + + bool manual_stride = (layout == MALI_TEXTURE_LINEAR) + && panfrost_needs_explicit_stride(slices, width, + first_level, last_level, bytes_per_pixel); + + struct mali_texture_descriptor descriptor = { + .width = MALI_POSITIVE(u_minify(width, first_level)), + .height = MALI_POSITIVE(u_minify(height, first_level)), + .depth = MALI_POSITIVE(u_minify(depth, first_level)), + .array_size = MALI_POSITIVE(array_size), + .format = { + .swizzle = panfrost_translate_swizzle_4(desc->swizzle), + .format = mali_format, + .srgb = (desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB), + .type = type, + .layout = layout, + .manual_stride = manual_stride, + .unknown2 = 1, + }, + .levels = last_level - first_level, + .swizzle = swizzle + }; + + memcpy(out, &descriptor, sizeof(descriptor)); + + base |= panfrost_compression_tag(desc, mali_format, layout); + + /* Inject the addresses in, interleaving array indices, mip levels, + * cube faces, and strides in that order */ + + unsigned first_face = 0, last_face = 0, face_mult = 1; + + if (type == MALI_TEX_CUBE) { + face_mult = 6; + panfrost_adjust_cube_dimensions(&first_face, &last_face, &first_layer, &last_layer); + } + + mali_ptr *payload = (mali_ptr *) (out + sizeof(struct mali_texture_descriptor)); + unsigned idx = 0; + + for (unsigned w = first_layer; w <= last_layer; ++w) { + for (unsigned l = first_level; l <= last_level; ++l) { + for (unsigned f = first_face; f <= last_face; ++f) { + payload[idx++] = base + panfrost_texture_offset( + slices, type == MALI_TEX_3D, + cube_stride, l, w * face_mult + f); + + if (manual_stride) + payload[idx++] = slices[l].stride; + } + } + } +} + /* Computes sizes for checksumming, which is 8 bytes per 16x16 tile. * Checksumming is believed to be a CRC variant (CRC64 based on the size?). * This feature is also known as "transaction elimination". */ @@ -52,3 +266,19 @@ panfrost_compute_checksum_size( return slice->checksum_stride * tile_count_y; } + +unsigned +panfrost_get_layer_stride(struct panfrost_slice *slices, bool is_3d, unsigned cube_stride, unsigned level) +{ + return is_3d ? slices[level].size0 : cube_stride; +} + +/* Computes the offset into a texture at a particular level/face. Add to + * the base address of a texture to get the address to that level/face */ + +unsigned +panfrost_texture_offset(struct panfrost_slice *slices, bool is_3d, unsigned cube_stride, unsigned level, unsigned face) +{ + unsigned layer_stride = panfrost_get_layer_stride(slices, is_3d, cube_stride, level); + return slices[level].offset + (face * layer_stride); +} |