Compressed Texture Factory

2 files changed, 88 insertions, 0 deletions

diff --git a/src/utils/TextureUtils.cpp b/src/utils/TextureUtils.cpp
new file mode 100644
index 0000000..7b70f19
--- /dev/null
+++ b/src/utils/TextureUtils.cpp
@@ -0,0 +1,57 @@
+#include "TextureUtils.h"
+#include <vector>
+#include <binarytools/endianness.h>
+
+size_t TextureUtils::CalculateTextureSize(TextureType type, uint32_t width, uint32_t height) {
+    switch (type) {
+        // 4 bytes per pixel
+        case TextureType::RGBA32bpp:
+            return width * height * 4;
+        // 2 bytes per pixel
+        case TextureType::TLUT:
+        case TextureType::RGBA16bpp:
+        case TextureType::GrayscaleAlpha16bpp:
+            return width * height * 2;
+        // 1 byte per pixel
+        case TextureType::Grayscale8bpp:
+        case TextureType::Palette8bpp:
+        case TextureType::GrayscaleAlpha8bpp:
+        // TODO: We need to validate this MegaMech
+        case TextureType::GrayscaleAlpha1bpp:
+            return width * height;
+        // 1/2 byte per pixel
+        case TextureType::Palette4bpp:
+        case TextureType::Grayscale4bpp:
+        case TextureType::GrayscaleAlpha4bpp:
+            return (width * height) / 2;
+        default:
+            return 0;
+    }
+}
+
+std::vector<uint8_t> TextureUtils::alloc_ia8_text_from_i1(uint16_t *in, int16_t width, int16_t height) {
+    int32_t inPos;
+    uint16_t bitMask;
+    int16_t outPos = 0;
+    const auto out = new uint8_t[width * height];
+
+    for (int32_t inPos = 0; inPos < (width * height) / 16; inPos++) {
+        uint16_t bitMask = 0x8000;
+
+        while (bitMask != 0) {
+            if (BSWAP16(in[inPos]) & bitMask) {
+                out[outPos] = 0xFF;
+            } else {
+                out[outPos] = 0x00;
+            }
+
+            bitMask /= 2;
+            outPos++;
+        }
+    }
+
+    auto result = std::vector(out, out + width * height);
+    delete[] out;
+
+    return result;
+}
\ No newline at end of file
diff --git a/src/utils/TextureUtils.h b/src/utils/TextureUtils.h
new file mode 100644
index 0000000..90501c6
--- /dev/null
+++ b/src/utils/TextureUtils.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+#include <cstddef>
+
+enum class TextureType {
+    Error,
+    RGBA32bpp,
+    RGBA16bpp,
+    Palette4bpp,
+    Palette8bpp,
+    Grayscale4bpp,
+    Grayscale8bpp,
+    GrayscaleAlpha4bpp,
+    GrayscaleAlpha8bpp,
+    GrayscaleAlpha16bpp,
+    GrayscaleAlpha1bpp,
+    TLUT
+};
+
+struct TextureFormat {
+    TextureType type;
+    uint32_t depth;
+};
+
+class TextureUtils {
+  public:
+    static size_t CalculateTextureSize(TextureType type, uint32_t width, uint32_t height);
+    static std::vector<uint8_t> alloc_ia8_text_from_i1(uint16_t *in, int16_t width, int16_t height);
+};