example: add standalone "macaw" example

example/example.mk

@@ -1,6 +1,20 @@
+MACAW_OBJ = \
+	example/macaw.o \
+	vga.o \
+	holly/core.o \
+	holly/region_array.o \
+	holly/background.o \
+	holly/ta_fifo_polygon_converter.o \
+	macaw.data.o
+
+example/macaw.elf: LDSCRIPT = $(LIB)/alt.lds
+example/macaw.elf: $(START_OBJ) $(MACAW_OBJ)
+
 CUBE_OBJ = \
 	example/cube.o \
-	vga.o
+	vga.o \
+	holly/core.o \
+	holly/ta_fifo_polygon_converter.o
 
 example/cube.elf: LDSCRIPT = $(LIB)/alt.lds
 example/cube.elf: $(START_OBJ) $(CUBE_OBJ)

example/macaw.cpp

@@ -0,0 +1,119 @@
+#include <cstdint>
+
+#include "align.hpp"
+#include "vga.hpp"
+
+#include "holly/texture_memory_alloc.hpp"
+#include "holly.hpp"
+#include "holly/core.hpp"
+#include "holly/core_bits.hpp"
+#include "holly/ta_fifo_polygon_converter.hpp"
+#include "holly/ta_parameter.hpp"
+
+#include "macaw.hpp"
+
+struct vertex {
+  float x;
+  float y;
+  float z;
+  float u;
+  float v;
+  uint32_t color;
+};
+
+const struct vertex strip_vertices[4] = {
+  // [ position       ]  [ uv coordinates       ]  [color   ]
+  { -0.5f,   0.5f,  0.f, 0.f        , 127.f/128.f, 0x00000000}, // the first two base colors in a
+  { -0.5f,  -0.5f,  0.f, 0.f        , 0.f        , 0x00000000}, // non-Gouraud triangle strip are ignored
+  {  0.5f,   0.5f,  0.f, 127.f/128.f, 127.f/128.f, 0xffff00ff},
+  {  0.5f,  -0.5f,  0.f, 127.f/128.f, 0.f        , 0xffffff00},
+};
+constexpr uint32_t strip_length = (sizeof (strip_vertices)) / (sizeof (struct vertex));
+
+uint32_t _ta_parameter_buf[((32 * (strip_length + 2)) + 32) / 4];
+
+static float theta = 0;
+constexpr float half_degree = 0.01745329f / 2.f;
+
+uint32_t transform(uint32_t * ta_parameter_buf,
+		   const vertex * strip_vertices,
+		   const uint32_t strip_length)
+{
+  auto ta_parameter = reinterpret_cast<union ta_parameter *>(ta_parameter_buf);
+  int ix = 0;
+  uint32_t texture_address = (offsetof (struct texture_memory_alloc, texture));
+  ta_parameter[ix++].global_polygon_type_0 = global_polygon_type_0(texture_address);
+
+  for (uint32_t i = 0; i < strip_length; i++) {
+    bool end_of_strip = i == strip_length - 1;
+
+    float x = strip_vertices[i].x;
+    float y = strip_vertices[i].y;
+    float z = strip_vertices[i].z;
+    float x1;
+
+    x1 = x * __builtin_cosf(theta) - z * __builtin_sinf(theta);
+    z  = x * __builtin_sinf(theta) + z * __builtin_cosf(theta);
+    x  = x1;
+    x *= 240.f;
+    y *= 240.f;
+    x += 320.f;
+    y += 240.f;
+    z = 1.f / (z + 10.f);
+
+    ta_parameter[ix++].vertex_polygon_type_3 =
+      vertex_polygon_type_3(x, y, z,
+			    strip_vertices[i].u,
+			    strip_vertices[i].v,
+			    strip_vertices[i].color,
+			    end_of_strip);
+  }
+
+  ta_parameter[ix++].global_end_of_list = global_end_of_list();
+
+  theta += half_degree;
+
+  return ix * 32;
+}
+
+void main()
+{
+  vga();
+
+  auto src = reinterpret_cast<const uint8_t *>(&_binary_macaw_data_start);
+  auto size  = reinterpret_cast<const uint32_t>(&_binary_macaw_data_size);
+  auto mem = reinterpret_cast<texture_memory_alloc *>(0xa400'0000);
+  for (uint32_t px = 0; px < size / 3; px++) {
+    uint8_t r = src[px * 3 + 0];
+    uint8_t g = src[px * 3 + 1];
+    uint8_t b = src[px * 3 + 2];
+
+    uint16_t rgb565 = ((r / 8) << 11) | ((g / 4) << 5) | ((b / 8) << 0);
+    mem->texture[px] = rgb565;
+  }
+
+  holly.SOFTRESET = softreset::pipeline_soft_reset
+		  | softreset::ta_soft_reset;
+  holly.SOFTRESET = 0;
+
+  core_init();
+  core_init_texture_memory();
+
+  // the address of `scene` must be a multiple of 32 bytes
+  // this is mandatory for ch2-dma to the ta fifo polygon converter
+  uint32_t * ta_parameter_buf = align_32byte(_ta_parameter_buf);
+
+  while (true) {
+    v_sync_out();
+    v_sync_in();
+
+    ta_polygon_converter_init();
+    uint32_t ta_parameter_size = transform(ta_parameter_buf, strip_vertices, strip_length);
+    ta_polygon_converter_transfer(ta_parameter_buf, ta_parameter_size);
+    ta_wait_opaque_list();
+
+    constexpr int frame_ix = 0;
+    constexpr int num_frames = 0;
+    core_start_render(frame_ix, num_frames);
+  }
+}

float_uint32.hpp

@@ -4,7 +4,7 @@
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wstrict-aliasing"
-constexpr uint32_t _i(float f) {
+inline uint32_t _i(float f) {
   return *(reinterpret_cast<uint32_t *>(&f));
 }
 #pragma GCC diagnostic pop

holly/core.cpp

@@ -60,7 +60,7 @@ void core_init_texture_memory()
                );
 }
 
-void core_start_render(int fb)
+void core_start_render(int frame_ix, int num_frames)
 {
   holly.REGION_BASE = (offsetof (struct texture_memory_alloc, region_array));
   holly.PARAM_BASE = (offsetof (struct texture_memory_alloc, isp_tsp_parameters));
@@ -73,11 +73,10 @@ void core_start_render(int fb)
   holly.FB_W_CTRL = 1 << 3 | fb_w_ctrl::fb_packmode::_565_rgb_16bit;
   holly.FB_W_LINESTRIDE = (640 * 2) / 8;
 
-  int w_fb = (!(!fb)) * 0x00096000;
-  int r_fb = (!fb) * 0x00096000;
+  int w_fb = ((frame_ix + 0) & num_frames) * 0x00096000;
+  int r_fb = ((frame_ix + 1) & num_frames) * 0x00096000;
   holly.FB_W_SOF1 = (offsetof (struct texture_memory_alloc, framebuffer)) + w_fb;
-  //holly.FB_R_SOF1 = (offsetof (struct texture_memory_alloc, framebuffer)) + r_fb;
-  holly.FB_R_SOF1 = (offsetof (struct texture_memory_alloc, framebuffer)) + w_fb;
+  holly.FB_R_SOF1 = (offsetof (struct texture_memory_alloc, framebuffer)) + r_fb;
 
   holly.STARTRENDER = 1;
 }

holly/core.hpp

@@ -2,4 +2,4 @@
 
 void core_init();
 void core_init_texture_memory();
-void core_start_render(int fb);
+void core_start_render(int frame_ix, int num_frames);

holly/ta_parameter.hpp

@@ -312,3 +312,13 @@ static_assert((offsetof (struct global_end_of_list, _res3)) == 0x10);
 static_assert((offsetof (struct global_end_of_list, _res4)) == 0x14);
 static_assert((offsetof (struct global_end_of_list, _res5)) == 0x18);
 static_assert((offsetof (struct global_end_of_list, _res6)) == 0x1c);
+
+union ta_parameter {
+  struct global_polygon_type_0 global_polygon_type_0;
+  struct global_sprite global_sprite;
+
+  struct vertex_polygon_type_0 vertex_polygon_type_0;
+  struct vertex_polygon_type_3 vertex_polygon_type_3;
+
+  struct global_end_of_list global_end_of_list;
+};

main.cpp

@@ -77,17 +77,6 @@ void main()
   maple_test();
   //((void(*)(void))0xac010000)();
 
-  /*
-  volatile uint16_t * framebuffer = reinterpret_cast<volatile uint16_t *>(&texture_memory[0]);
-  for (int y = 0; y < 480; y++) {
-    for (int x = 0; x < 640; x++) {
-      struct hsv hsv = {(y * 255) / 480, 255, 255};
-      struct rgb rgb = hsv_to_rgb(hsv);
-      framebuffer[y * 640 + x] = ((rgb.r >> 3) << 11) | ((rgb.g >> 2) << 5) | ((rgb.b >> 3) << 0);
-    }
-  }
-  */
-
   /*
   volatile texture_memory_alloc * mem = reinterpret_cast<volatile texture_memory_alloc *>(0xa400'0000);
 

scene.cpp

@@ -12,22 +12,6 @@
   -0.5,0.5    |  0.5,0.5
  */
 
-struct vertex0 {
-  float x;
-  float y;
-  float z;
-  float u;
-  float v;
-  uint32_t color;
-};
-
-const struct vertex0 scene_triangle[4] = {
-  { -0.5f,   0.5f,  0.f, 0.f        , 128.f/128.f, 0x00000000}, // the first two base colors in a
-  { -0.5f,  -0.5f,  0.f, 0.f        , 0.f        , 0x00000000}, // triangle strip are ignored
-  {  0.5f,   0.5f,  0.f, 128.f/128.f, 128.f/128.f, 0xffff00ff},
-  {  0.5f,  -0.5f,  0.f, 128.f/128.f, 0.f        , 0xffffff00},
-};
-
 struct vertex1 {
   float x;
   float y;
@@ -74,12 +58,6 @@ uint32_t scene_transform_quad(uint32_t * _scene, uint32_t base_color)
 static float theta = 0;
 constexpr float half_degree = 0.01745329f / 2.f;
 
-union ta_parameter {
-  struct global_polygon_type_0 global_polygon_type_0;
-  struct vertex_polygon_type_3 vertex_polygon_type_3;
-  struct global_end_of_list global_end_of_list;
-};
-
 uint32_t scene_transform(uint32_t * _scene)
 {
   ta_parameter * scene = reinterpret_cast<ta_parameter *>(&_scene[0]);