From 2f1bb5523bbd7ad7972ed0a9b518762e7ec72d94 Mon Sep 17 00:00:00 2001
From: Luke Benstead <kazade@gmail.com>
Date: Wed, 7 Apr 2021 21:54:21 +0100
Subject: [PATCH] Start fixing up DC building

---
 CMakeLists.txt             | 24 ++++++++++------
 GL/platforms/sh4.c         |  7 +++++
 samples/polymark/main.c    |  1 +
 samples/zclip/main.c       |  6 ++--
 toolchains/Dreamcast.cmake | 59 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 87 insertions(+), 10 deletions(-)
 create mode 100644 toolchains/Dreamcast.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9fb960f..56a0fee 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,8 +5,10 @@ set(CMAKE_C_STANDARD 99)
 
 include_directories(include)
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
+if(NOT PLATFORM_DREAMCAST)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
+endif()
 
 set(
     SOURCES
@@ -31,15 +33,21 @@ set(
 )
 
 if(PLATFORM_DREAMCAST)
-set(SOURCES ${SOURCES} GL/platforms/sh4.c)
+    set(SOURCES ${SOURCES} GL/platforms/sh4.c)
 else()
-find_package(SDL2 REQUIRED)
-include_directories(${SDL2_INCLUDE_DIRS})
-link_libraries(${SDL2_LIBRARIES})
-set(SOURCES ${SOURCES} GL/platforms/software.c GL/platforms/software/edge_equation.c GL/platforms/software/parameter_equation.c)
+    find_package(SDL2 REQUIRED)
+    include_directories(${SDL2_INCLUDE_DIRS})
+    link_libraries(${SDL2_LIBRARIES})
+    set(
+        SOURCES
+        ${SOURCES}
+        GL/platforms/software.c
+        GL/platforms/software/edge_equation.c
+        GL/platforms/software/parameter_equation.c
+    )
 endif()
 
-add_library(GLdc ${SOURCES})
+add_library(GLdc STATIC ${SOURCES})
 link_libraries(m)
 
 include_directories(include)
diff --git a/GL/platforms/sh4.c b/GL/platforms/sh4.c
index 0dceeb1..23d8c7a 100644
--- a/GL/platforms/sh4.c
+++ b/GL/platforms/sh4.c
@@ -63,3 +63,10 @@ void SceneListFinish() {
 void SceneFinish() {
     pvr_scene_finish();
 }
+
+const VideoMode* GetVideoMode() {
+    static VideoMode mode;
+    mode.width = vid_mode->width;
+    mode.height = vid_mode->height;
+    return &mode;
+}
diff --git a/samples/polymark/main.c b/samples/polymark/main.c
index 2a671fc..d0d6378 100644
--- a/samples/polymark/main.c
+++ b/samples/polymark/main.c
@@ -10,6 +10,7 @@
 #include <kos.h>
 
 #include <GL/gl.h>
+#include <GL/glkos.h>
 
 #include <stdlib.h>
 #include <time.h>
diff --git a/samples/zclip/main.c b/samples/zclip/main.c
index c4acccf..2da470b 100644
--- a/samples/zclip/main.c
+++ b/samples/zclip/main.c
@@ -8,9 +8,11 @@
 #include "GL/glext.h"
 #include "GL/glkos.h"
 
-extern uint8_t romdisk[];
+#ifdef __DREAMCAST__
+#include <kos.h>
+extern uint8 romdisk[];
 KOS_INIT_ROMDISK(romdisk);
-
+#endif
 
 /* Image type - contains height, width, and data */
 typedef struct                                      // Create A Structure
diff --git a/toolchains/Dreamcast.cmake b/toolchains/Dreamcast.cmake
new file mode 100644
index 0000000..e733d6a
--- /dev/null
+++ b/toolchains/Dreamcast.cmake
@@ -0,0 +1,59 @@
+SET(CMAKE_SYSTEM_NAME Generic)
+
+SET(PLATFORM_DREAMCAST TRUE)
+
+SET(CMAKE_SYSTEM_VERSION 1)
+
+set(CMAKE_CROSSCOMPILING TRUE)
+
+set(CMAKE_C_COMPILER $ENV{KOS_CC_BASE}/bin/sh-elf-gcc)
+set(CMAKE_CXX_COMPILER $ENV{KOS_CC_BASE}/bin/sh-elf-g++)
+
+add_compile_options(-ml -m4-single-only -ffunction-sections -fdata-sections)
+
+set(CMAKE_EXE_LINKER_FLAGS " -ml -m4-single-only -Wl,-Ttext=0x8c010000 -Wl,--gc-sections -T$ENV{KOS_BASE}/utils/ldscripts/shlelf.xc -nodefaultlibs" CACHE INTERNAL "" FORCE)
+
+set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+
+set(CMAKE_SYSTEM_INCLUDE_PATH "${CMAKE_SYSTEM_INCLUDE_PATH} $ENV{KOS_BASE}/include $ENV{KOS_BASE}/kernel/arch/dreamcast/include $ENV{KOS_BASE}/addons/include $ENV{KOS_BASE}/../kos-ports/include")
+
+INCLUDE_DIRECTORIES(
+    $ENV{KOS_BASE}/include
+    $ENV{KOS_BASE}/kernel/arch/dreamcast/include
+    $ENV{KOS_BASE}/addons/include
+    $ENV{KOS_BASE}/../kos-ports/include
+)
+
+LINK_DIRECTORIES(
+    $ENV{KOS_BASE}/addons/lib/dreamcast
+    $ENV{KOS_PORTS}/lib
+)
+
+IF(${CMAKE_BUILD_TYPE} MATCHES Debug)
+LINK_DIRECTORIES($ENV{KOS_BASE}/lib/dreamcast/debug)
+ELSE()
+LINK_DIRECTORIES($ENV{KOS_BASE}/lib/dreamcast)
+ENDIF()
+
+
+add_link_options(-L$ENV{KOS_BASE}/lib/dreamcast LINKER:--start-group -lstdc++ -lkallisti -lc -lgcc -Wl,--end-group)
+link_libraries(stdc++ kallisti c gcc m)
+
+SET(CMAKE_EXECUTABLE_SUFFIX ".elf")
+SET(CMAKE_EXECUTABLE_SUFFIX_CXX ".elf")
+
+ADD_DEFINITIONS(
+    -D__DREAMCAST__
+    -DDREAMCAST
+    -D_arch_dreamcast
+    -D__arch_dreamcast
+    -D_arch_sub_pristine
+)
+
+if (NOT CMAKE_BUILD_TYPE MATCHES Debug)
+    ADD_DEFINITIONS(-DNDEBUG)
+endif()
+
+SET(CMAKE_ASM_FLAGS "")
+SET(CMAKE_ASM_FLAGS_RELEASE "")