From 6d97cc4e74978b16b61d82a6d65d7bca0aa277c3 Mon Sep 17 00:00:00 2001
From: Jaby Blubb <fenir50@web.de>
Date: Sat, 16 Dec 2023 23:10:24 +0100
Subject: [PATCH] Test load ABCD

---
 src/Library/src/BootLoader/gpu_boot.cpp | 42 +++++++++++++++++++++----
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/src/Library/src/BootLoader/gpu_boot.cpp b/src/Library/src/BootLoader/gpu_boot.cpp
index 65250187..4b1842fd 100644
--- a/src/Library/src/BootLoader/gpu_boot.cpp
+++ b/src/Library/src/BootLoader/gpu_boot.cpp
@@ -39,6 +39,36 @@ namespace JabyEngine {
             using namespace JabyEngine::GPU;
 
             namespace SJIS {
+                struct FontBuffer {
+                    static constexpr auto FontSize      = SizeU16::create(16, 16);
+                    static constexpr auto AmountOfChars = 4;
+
+                    struct Line {
+                        Color pixel[FontSize.width];
+
+                        void load(uint16_t bit_pattern) {
+                            size_t px_idx = 0;
+                            for(uint16_t shift = 1 << 15; shift; shift = shift >> 1) {
+                                this->pixel[px_idx++] = bit_pattern & shift ? Color::from_rgb(0xFF, 0xFF, 0xFF) : Color::from_rgb(0x0, 0x0, 0x0);
+                            }
+                        }
+                    };
+
+                    struct Row {
+                        Line character[AmountOfChars];
+                    };
+
+                    Row rows[FontSize.height];
+                    
+                    void load_char(int32_t chr_idx, const uint16_t* bit_map) {
+                        for(auto& cur_row : this->rows) {
+                            auto& cur_line = cur_row.character[chr_idx];
+
+                            cur_line.load(__builtin_bswap16(*bit_map++));
+                        }
+                    }
+                };
+
                 struct SpecialChar {
                     uint8_t base_offset;
                     uint8_t tile_id;
@@ -70,17 +100,17 @@ namespace JabyEngine {
                 static const auto LowerCaseLetter = RangeChar{{0x81, 64}, 26};
 
                 void load() {
-                    alignas(uint32_t) Color test[16*16];
+                    FontBuffer buffer;
 
-                    for(auto& color : test) {
-                        color = Color::from_rgb(0, 0xFF, 0xFF);
+                    for(size_t n = 0; n < 4; n++) {
+                        buffer.load_char(n, SysCall::Krom2RawAdd(0x8200 | (UpperCaseLetter.start_char.base_offset + n)));
                     }
 
                     GPU::internal::DMA::Receive::prepare();
-                    GPU::internal::DMA::Receive::set_dst(PositionU16::create(0, 0), SizeU16::create(16, 16)); 
-                    GPU::internal::DMA::Receive::set_src(reinterpret_cast<const uintptr_t>(test));
+                    GPU::internal::DMA::Receive::set_dst(PositionU16::create(0, 0), SizeU16::create(16*4, 16)); 
+                    GPU::internal::DMA::Receive::set_src(reinterpret_cast<const uintptr_t>(&buffer.rows));
                     printf("Sending...\n");
-                    GPU::internal::DMA::Receive::start(sizeof(test)/4/16);
+                    GPU::internal::DMA::Receive::start(sizeof(buffer)/4/16);
                     GPU::internal::DMA::wait();
                     GPU::internal::DMA::end();
                     printf("Done!\n");