From d3b25501b5dd521e3844a07c47db023e48ad35dd Mon Sep 17 00:00:00 2001
From: Samuel Walker <swalker@piwalker.net>
Date: Thu, 27 Mar 2025 20:07:27 -0600
Subject: [PATCH] GS init and ISO packaging

---
 CMakeLists.txt       |  9 ++++++++-
 ISO/Assets/asset.txt |  1 +
 ISO/SYSTEM.CNF       |  3 +++
 main.c               | 38 +++++++++++++++++++++++++++++++++++---
 4 files changed, 47 insertions(+), 4 deletions(-)
 create mode 100644 ISO/Assets/asset.txt
 create mode 100644 ISO/SYSTEM.CNF

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 080f915..0f144a5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,4 +3,11 @@ set(MAKE_TOOLCHAIN_FILE $PS2SDK/ps2dev.cmake)
 set(CMAKE_C_FLAGS_DEBUG -DDEBUG)
 project(helloworld)
 add_executable(helloworld.elf main.c)
-target_link_libraries(helloworld.elf debug -ldebug)
\ No newline at end of file
+target_link_libraries(helloworld.elf debug -ldebug -lgraph -ldma -ldraw)
+add_custom_command(
+    TARGET helloworld.elf
+    POST_BUILD
+    COMMAND mkisofs -l -o helloworld.iso helloworld.elf ${CMAKE_CURRENT_SOURCE_DIR}/ISO
+    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/SYSTEM.CNF ${CMAKE_CURRENT_BUILD_DIR}/helloworld.elf
+    VERBATIM
+)
\ No newline at end of file
diff --git a/ISO/Assets/asset.txt b/ISO/Assets/asset.txt
new file mode 100644
index 0000000..327c066
--- /dev/null
+++ b/ISO/Assets/asset.txt
@@ -0,0 +1 @@
+Some asset
\ No newline at end of file
diff --git a/ISO/SYSTEM.CNF b/ISO/SYSTEM.CNF
new file mode 100644
index 0000000..ea11c33
--- /dev/null
+++ b/ISO/SYSTEM.CNF
@@ -0,0 +1,3 @@
+BOOT2 = cdrom0:\HELLOWORLD.ELF;1
+VER = 0.0
+VMODE = NTSC
\ No newline at end of file
diff --git a/main.c b/main.c
index 55b6ebd..ac5db37 100644
--- a/main.c
+++ b/main.c
@@ -1,7 +1,13 @@
+#include "draw_primitives.h"
+#include "graph_vram.h"
+#include "gs_psm.h"
 #include <tamtypes.h>
 #include <sifrpc.h>
 #include <debug.h>
 #include <unistd.h>
+#include <dma.h>
+#include <graph.h>
+#include <draw.h>
 
 #ifdef DEBUG
 #define DEBUG_MSG(...) scr_printf(__VA_ARGS__)
@@ -9,15 +15,41 @@
 #define DEBUG_MSG(...)
 #endif
 
+#define OFFSET_X 0
+#define OFFSET_Y 0
 
+int gs_init(int width, int height, int psm, int psmz, int vmode, int gmode) {
+    int fb_address = graph_vram_allocate(width, height, psm, GRAPH_ALIGN_PAGE);
+    graph_set_mode(gmode, vmode, GRAPH_MODE_FIELD, GRAPH_DISABLE);
+    graph_set_screen(OFFSET_X, OFFSET_Y, width, height);
+    graph_set_bgcolor(0, 0, 0);
+    graph_set_framebuffer_filtered(fb_address, width, psm, 0, 0);
+    graph_enable_output();
+    
+    qword_t buff[20];
+    qword_t *q = buff;
+    q = draw_primitive_xyoffset(q, 0, 0, 0);
+    q = draw_finish(q);
+    dma_channel_send_normal(DMA_CHANNEL_GIF, buff, q-buff, 0, 0);
+    dma_wait_fast();
+    return 0;
+}
 
 int main() {
 #ifdef DEBUG
     sceSifInitRpc(0);
     init_scr();
 #endif
-    DEBUG_MSG("Hello PS2!!!\n");
-    sleep(5);
+    DEBUG_MSG("PS2 Initialized\n");
+    // initialize DMAC
+    dma_channel_initialize(DMA_CHANNEL_GIF, 0, 0);
+    dma_channel_fast_waits(DMA_CHANNEL_GIF);
+    DEBUG_MSG("DMA Initialized...");
+    // initialize graphics mode
+    gs_init(664, 480, GS_PSM_32, GS_PSMZ_32, GRAPH_MODE_NTSC, GRAPH_MODE_FIELD);
+    DEBUG_MSG("GS Initialized...");
+    // clear screen
+    // build buffer with triangle data
 
-    return 0;
+    sleep(5);
 }
\ No newline at end of file