rotating triangle

Makefile.dreamcast.mk

@@ -50,8 +50,5 @@ LIBGCC_OBJ = \
 
 include classpath.mk
 
-CLASS_FILES = \
-	example/DreamcastVideo2.class.o
-
 main.elf: LDSCRIPT = $(LIB)/main.lds
-main.elf: $(START_OBJ) $(OBJ) $(MAIN_OBJ) $(MAIN_DREAMCAST_OBJ) $(LIBGCC_OBJ) $(CLASS_FILES) $(CLASS_PATH)
+main.elf: $(START_OBJ) $(OBJ) $(MAIN_OBJ) $(MAIN_DREAMCAST_OBJ) $(LIBGCC_OBJ) $(CLASS_PATH)

c/assert_dreamcast.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "printf.h"
+#include "class_file.h"
 
 #define assert(b)                                                       \
   do {                                                                  \
@@ -9,3 +10,32 @@
       while (1);                                                        \
     }                                                                   \
   } while (0);
+
+static inline void assert_print_string(struct constant * constant)
+{
+  for (int i = 0; i < constant->utf8.length; i++) {
+    printc(constant->utf8.bytes[i]);
+  }
+  printc('\n');
+}
+
+#define assertvm(vm, b) \
+do { \
+  if (!(b)) { \
+    printf("%s:%d %s: vm assertion `%s` failed\n", __FILE__, __LINE__, __func__, #b); \
+ \
+    struct class_entry * class_entry = vm->current_frame->class_entry; \
+    struct constant * class_constant = &class_entry->class_file->constant_pool[class_entry->class_file->this_class - 1]; \
+    assert(class_constant->tag == CONSTANT_Class); \
+    struct constant * class_name_constant = &class_entry->class_file->constant_pool[class_constant->class.name_index - 1]; \
+    assert(class_name_constant->tag == CONSTANT_Utf8); \
+    assert_print_string(class_name_constant); \
+ \
+    struct method_info * method_info = vm->current_frame->method; \
+    struct constant * method_name_constant = &class_entry->class_file->constant_pool[method_info->name_index - 1]; \
+    assert(method_name_constant->tag == CONSTANT_Utf8); \
+    assert_print_string(method_name_constant);               \
+ \
+    while (1); \
+  } \
+   } while (0);

c/classpath.h

@@ -1,3 +1,6 @@
+#include "example/DreamcastVideo2.class.h"
+#include "example/DreamcastVideo.class.h"
+#include "example/Vec2.class.h"
 #include "java/io/PrintStream.class.h"
 #include "java/lang/Integer.class.h"
 #include "java/lang/Math.class.h"

c/classpath.inc.c

@@ -1,3 +1,6 @@
+(const uint8_t *)&_binary_example_DreamcastVideo2_class_start,
+(const uint8_t *)&_binary_example_DreamcastVideo_class_start,
+(const uint8_t *)&_binary_example_Vec2_class_start,
 (const uint8_t *)&_binary_java_io_PrintStream_class_start,
 (const uint8_t *)&_binary_java_lang_Integer_class_start,
 (const uint8_t *)&_binary_java_lang_Math_class_start,

c/main_dreamcast.c

@@ -8,7 +8,6 @@
 #include "sh7091_scif.h"
 
 #include "classpath.h"
-#include "example/DreamcastVideo2.class.h"
 
 void main()
 {
@@ -16,7 +15,6 @@ void main()
 
   const uint8_t * class_file_buffers[] = {
     #include "classpath.inc.c"
-    (const uint8_t *)&_binary_example_DreamcastVideo2_class_start,
   };
   int class_file_buffers_length = (sizeof (class_file_buffers)) / (sizeof (class_file_buffers[0]));
 

c/printf.h

@@ -25,6 +25,8 @@ void print_cstring(const char * s);
 void _printf(const char * format, ...);
 
 #define printf(...) _printf(__VA_ARGS__)
+#define printc(c) print_char(c)
+#define prints(s) print_cstring(s)
 
 #if defined(DEBUG_PRINT)
 #define debugf(...) _printf(__VA_ARGS__)

classpath.mk

@@ -1,4 +1,7 @@
 CLASS_PATH = \
+	example/DreamcastVideo2.class.o \
+	example/DreamcastVideo.class.o \
+	example/Vec2.class.o \
 	java/io/PrintStream.class.o \
 	java/lang/Integer.class.o \
 	java/lang/Math.class.o \

example/DreamcastVideo.class.h

@@ -3,7 +3,7 @@
 #include <stdint.h>
 
 #ifdef __cplusplus
-extern "C" {
+extern C {
 #endif
 
 extern uint32_t _binary_example_DreamcastVideo_class_start __asm("_binary_example_DreamcastVideo_class_start");

example/DreamcastVideo2.class.h

@@ -3,7 +3,7 @@
 #include <stdint.h>
 
 #ifdef __cplusplus
-extern "C" {
+extern C {
 #endif
 
 extern uint32_t _binary_example_DreamcastVideo2_class_start __asm("_binary_example_DreamcastVideo2_class_start");

example/DreamcastVideo2.java

@@ -17,10 +17,22 @@ import sega.dreamcast.systembus.SystembusBits;
 import sega.dreamcast.MemoryMap;
 import java.misc.Memory;
 
+class Vec2 {
+    float x;
+    float y;
+}
+
 class DreamcastVideo2 {
-    public static TAGlobalParameter.polygon_type_0 gt0;
+    static final int framebuffer_width = 640;
-    public static TAVertexParameter.polygon_type_0 vt0;
+    static final int framebuffer_height = 480;
-    public static TAGlobalParameter.end_of_list eol;
+
+    static TAGlobalParameter.polygon_type_0 gt0;
+    static TAVertexParameter.polygon_type_0 vt0;
+    static TAGlobalParameter.end_of_list eol;
+
+    static Vec2[] vtx;
+
+    static float theta;
 
     static {
         int parameter_control_word = TAParameter.para_control__para_type__polygon_or_modifier_volume
@@ -52,6 +64,31 @@ class DreamcastVideo2 {
                                                    0xff00ff00); // color (green)
 
         eol = new TAGlobalParameter.end_of_list(TAParameter.para_control__para_type__end_of_list);
+
+        vtx = new Vec2[3];
+        for (int i = 0; i < 3; i++)
+            vtx[i] = new Vec2();
+        vtx[0].x =  0.0f;
+        vtx[0].y =  1.0f;
+        vtx[1].x =  0.866025f;
+        vtx[1].y = -0.5f;
+        vtx[2].x = -0.866025f;
+        vtx[2].y = -0.5f;
+    }
+
+    public static void transform_vertex(Vec2 v, boolean end_of_strip) {
+        DreamcastVideo2.vt0.parameter_control_word = TAParameter.para_control__para_type__vertex_parameter;
+        if (end_of_strip)
+            DreamcastVideo2.vt0.parameter_control_word |= TAParameter.para_control__end_of_strip;
+
+        float x0 = v.x * Math.cos(theta) - v.y * Math.sin(theta);
+        float y0 = v.x * Math.sin(theta) + v.y * Math.cos(theta);
+        float x = x0 * 240 + 320;
+        float y = -y0 * 240 + 240;
+
+        DreamcastVideo2.vt0.x = x;
+        DreamcastVideo2.vt0.y = y;
+        Memory.putSQ1(DreamcastVideo2.vt0, MemoryMap.ta_fifo_polygon_converter);
     }
 
     public static void transfer_scene() {
@@ -59,21 +96,9 @@ class DreamcastVideo2 {
         Memory.putSQ1(DreamcastVideo2.gt0, MemoryMap.ta_fifo_polygon_converter);
 
         // vertex parameters
-        DreamcastVideo2.vt0.parameter_control_word = TAParameter.para_control__para_type__vertex_parameter;
+        for (int i = 0; i < 3; i++) {
-        DreamcastVideo2.vt0.x = 10.0f;
+            transform_vertex(vtx[i], (i == 2));
-        DreamcastVideo2.vt0.y = 10.0f;
+        }
-        Memory.putSQ1(DreamcastVideo2.vt0, MemoryMap.ta_fifo_polygon_converter);
-
-        DreamcastVideo2.vt0.parameter_control_word = TAParameter.para_control__para_type__vertex_parameter;
-        DreamcastVideo2.vt0.x = 100.0f;
-        DreamcastVideo2.vt0.y = 10.0f;
-        Memory.putSQ1(DreamcastVideo2.vt0, MemoryMap.ta_fifo_polygon_converter);
-
-        DreamcastVideo2.vt0.parameter_control_word = TAParameter.para_control__para_type__vertex_parameter
-                                                   | TAParameter.para_control__end_of_strip;
-        DreamcastVideo2.vt0.x = 100.0f;
-        DreamcastVideo2.vt0.y = 100.0f;
-        Memory.putSQ1(DreamcastVideo2.vt0, MemoryMap.ta_fifo_polygon_converter);
 
         // end of list
         Memory.putSQ1(DreamcastVideo2.eol, MemoryMap.ta_fifo_polygon_converter);
@@ -100,9 +125,6 @@ class DreamcastVideo2 {
         };
 
         int opb_size_total = opb_size[0].total();
-
-        int framebuffer_width = 640;
-        int framebuffer_height = 480;
         int num_render_passes = opb_size.length;
 
         Core.fb_init(framebuffer_width, framebuffer_height);
@@ -126,11 +148,10 @@ class DreamcastVideo2 {
         Background.background(TextureMemoryAllocation.background_start[1],
                               background_color);
 
-        //int ta = -1;
-        //int core = -2;
         int core = 0;
         int ta = 0;
         while (true) {
+            // unpipelined render loop
             TAFIFOPolygonConverter.init(TextureMemoryAllocation.isp_tsp_parameters_start[ta],
                                         TextureMemoryAllocation.isp_tsp_parameters_end[ta],
                                         TextureMemoryAllocation.object_list_start[ta],
@@ -141,6 +162,7 @@ class DreamcastVideo2 {
                                         framebuffer_height / 32);
             transfer_scene();
             TAFIFOPolygonConverter.wait_opaque_list();
+
             Core.start_render(TextureMemoryAllocation.region_array_start[ta],
                               TextureMemoryAllocation.isp_tsp_parameters_start[ta],
                               TextureMemoryAllocation.background_start[ta],
@@ -149,6 +171,8 @@ class DreamcastVideo2 {
             Core.wait_end_of_render_tsp();
             Memory.putU4(Holly.FB_R_SOF1, TextureMemoryAllocation.framebuffer_start[core]);
             core = (core + 1) % 1;
+
+            theta += Math.DEGREES_TO_RADIANS;
         }
     }
 }

example/Vec2.class.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern C {
+#endif
+
+extern uint32_t _binary_example_Vec2_class_start __asm("_binary_example_Vec2_class_start");
+extern uint32_t _binary_example_Vec2_class_end __asm("_binary_example_Vec2_class_end");
+extern uint32_t _binary_example_Vec2_class_size __asm("_binary_example_Vec2_class_size");
+
+#ifdef __cplusplus
+}
+#endif

generate_classpath.sh

@@ -66,10 +66,12 @@ function classpath_h () {
     done
 }
 
+set -e
+
 find sega/ java/ -name '*.class' -exec rm -f {} \;
 find example/ sega/ java/ -name '*.java' | sort | make_class
-find sega/ java/ -name '*.class' | sort | rename_class_files
+find example/ sega/ java/ -name '*.class' | sort | rename_class_files
-find sega/ java/ -name '*.class' | sort | classpath_mk
+find example/ sega/ java/ -name '*.class' | sort | classpath_mk
-find sega/ java/ -name '*.class' | sort | classpath_inc_c
+find example/ sega/ java/ -name '*.class' | sort | classpath_inc_c
-find sega/ java/ -name '*.class' | sort | make_header
+find example/ sega/ java/ -name '*.class' | sort | make_header
-find sega/ java/ -name '*.class' | sort | classpath_h
+find example/ sega/ java/ -name '*.class' | sort | classpath_h

p/VecTest.java

@@ -0,0 +1,30 @@
+package p;
+
+class Vec2 {
+    float x;
+    float y;
+}
+
+class VecTest {
+    static Vec2[] vtx;
+
+    static {
+        vtx = new Vec2[3];
+        for (int i = 0; i < 3; i++)
+            vtx[i] = new Vec2();
+        vtx[0].x =  0.0f;
+        vtx[0].y =  1.0f;
+        vtx[1].x =  0.866025f;
+        vtx[1].y = -0.5f;
+        vtx[2].x = -0.866025f;
+        vtx[2].y = -0.5f;
+    }
+
+    public static float test() {
+        return vtx[0].y;
+    }
+
+    public static void main(String[] args) {
+        System.out.println(test());
+    }
+}