From eac46ad7ceca5e35b396a8b80bfc38dc6ef1a4fe Mon Sep 17 00:00:00 2001
From: GPUCode <geoster3d@gmail.com>
Date: Tue, 6 Jun 2023 23:10:06 +0300
Subject: video_core: Add BCn decoding support

---
 src/video_core/texture_cache/decode_bc4.cpp | 96 -----------------------------
 1 file changed, 96 deletions(-)
 delete mode 100644 src/video_core/texture_cache/decode_bc4.cpp

(limited to 'src/video_core/texture_cache/decode_bc4.cpp')

diff --git a/src/video_core/texture_cache/decode_bc4.cpp b/src/video_core/texture_cache/decode_bc4.cpp
deleted file mode 100644
index ef98afdca..000000000
--- a/src/video_core/texture_cache/decode_bc4.cpp
+++ /dev/null
@@ -1,96 +0,0 @@
-// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-#include <algorithm>
-#include <array>
-#include <span>
-
-#include "common/assert.h"
-#include "common/common_types.h"
-#include "video_core/texture_cache/decode_bc4.h"
-#include "video_core/texture_cache/types.h"
-
-namespace VideoCommon {
-
-// https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_texture_compression_rgtc.txt
-[[nodiscard]] constexpr u32 DecompressBlock(u64 bits, u32 x, u32 y) {
-    const u32 code_offset = 16 + 3 * (4 * y + x);
-    const u32 code = (bits >> code_offset) & 7;
-    const u32 red0 = (bits >> 0) & 0xff;
-    const u32 red1 = (bits >> 8) & 0xff;
-    if (red0 > red1) {
-        switch (code) {
-        case 0:
-            return red0;
-        case 1:
-            return red1;
-        case 2:
-            return (6 * red0 + 1 * red1) / 7;
-        case 3:
-            return (5 * red0 + 2 * red1) / 7;
-        case 4:
-            return (4 * red0 + 3 * red1) / 7;
-        case 5:
-            return (3 * red0 + 4 * red1) / 7;
-        case 6:
-            return (2 * red0 + 5 * red1) / 7;
-        case 7:
-            return (1 * red0 + 6 * red1) / 7;
-        }
-    } else {
-        switch (code) {
-        case 0:
-            return red0;
-        case 1:
-            return red1;
-        case 2:
-            return (4 * red0 + 1 * red1) / 5;
-        case 3:
-            return (3 * red0 + 2 * red1) / 5;
-        case 4:
-            return (2 * red0 + 3 * red1) / 5;
-        case 5:
-            return (1 * red0 + 4 * red1) / 5;
-        case 6:
-            return 0;
-        case 7:
-            return 0xff;
-        }
-    }
-    return 0;
-}
-
-void DecompressBC4(std::span<const u8> input, Extent3D extent, std::span<u8> output) {
-    UNIMPLEMENTED_IF_MSG(extent.width % 4 != 0, "Unaligned width={}", extent.width);
-    UNIMPLEMENTED_IF_MSG(extent.height % 4 != 0, "Unaligned height={}", extent.height);
-    static constexpr u32 BLOCK_SIZE = 4;
-    size_t input_offset = 0;
-    for (u32 slice = 0; slice < extent.depth; ++slice) {
-        for (u32 block_y = 0; block_y < extent.height / 4; ++block_y) {
-            for (u32 block_x = 0; block_x < extent.width / 4; ++block_x) {
-                u64 bits;
-                std::memcpy(&bits, &input[input_offset], sizeof(bits));
-                input_offset += sizeof(bits);
-
-                for (u32 y = 0; y < BLOCK_SIZE; ++y) {
-                    for (u32 x = 0; x < BLOCK_SIZE; ++x) {
-                        const u32 linear_z = slice;
-                        const u32 linear_y = block_y * BLOCK_SIZE + y;
-                        const u32 linear_x = block_x * BLOCK_SIZE + x;
-                        const u32 offset_z = linear_z * extent.width * extent.height;
-                        const u32 offset_y = linear_y * extent.width;
-                        const u32 offset_x = linear_x;
-                        const u32 output_offset = (offset_z + offset_y + offset_x) * 4ULL;
-                        const u32 color = DecompressBlock(bits, x, y);
-                        output[output_offset + 0] = static_cast<u8>(color);
-                        output[output_offset + 1] = 0;
-                        output[output_offset + 2] = 0;
-                        output[output_offset + 3] = 0xff;
-                    }
-                }
-            }
-        }
-    }
-}
-
-} // namespace VideoCommon
-- 
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