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dreamcast/dreamcast2/example/cube_ta_fullscreen_textured.cpp

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#include "memorymap.hpp"
#include "holly/core/object_list_bits.hpp"
#include "holly/core/region_array.hpp"
#include "holly/core/region_array_bits.hpp"
#include "holly/core/parameter_bits.hpp"
#include "holly/core/parameter.hpp"
#include "holly/ta/global_parameter.hpp"
#include "holly/ta/vertex_parameter.hpp"
#include "holly/ta/parameter_bits.hpp"
#include "holly/holly.hpp"
#include "holly/holly_bits.hpp"
#include "sh7091/sh7091.hpp"
#include "sh7091/pref.hpp"
#include "sh7091/store_queue_transfer.hpp"
void transfer_background_polygon(uint32_t isp_tsp_parameter_start)
{
using namespace holly::core::parameter;
using parameter = isp_tsp_parameter<3>;
volatile parameter * polygon = (volatile parameter *)&texture_memory32[isp_tsp_parameter_start];
polygon->isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::always
| isp_tsp_instruction_word::culling_mode::no_culling;
polygon->tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
| tsp_instruction_word::dst_alpha_instr::zero
| tsp_instruction_word::fog_control::no_fog;
polygon->texture_control_word = 0;
polygon->vertex[0].x = 0.0f;
polygon->vertex[0].y = 0.0f;
polygon->vertex[0].z = 0.00001f;
polygon->vertex[0].base_color = 0xff00ff;
polygon->vertex[1].x = 32.0f;
polygon->vertex[1].y = 0.0f;
polygon->vertex[1].z = 0.00001f;
polygon->vertex[1].base_color = 0xff00ff;
polygon->vertex[2].x = 32.0f;
polygon->vertex[2].y = 32.0f;
polygon->vertex[2].z = 0.00001f;
polygon->vertex[2].base_color = 0xff00ff;
}
static inline uint32_t transfer_ta_global_end_of_list(uint32_t store_queue_ix)
{
using namespace holly::ta;
using namespace holly::ta::parameter;
//
// TA "end of list" global transfer
//
volatile global_parameter::end_of_list * end_of_list = (volatile global_parameter::end_of_list *)&store_queue[store_queue_ix];
store_queue_ix += (sizeof (global_parameter::end_of_list));
end_of_list->parameter_control_word = parameter_control_word::para_type::end_of_list;
// start store queue transfer of `end_of_list` to the TA
pref(end_of_list);
return store_queue_ix;
}
static inline uint32_t transfer_ta_global_polygon(uint32_t store_queue_ix, uint32_t texture_address)
{
using namespace holly::core::parameter;
using namespace holly::ta;
using namespace holly::ta::parameter;
//
// TA polygon global transfer
//
volatile global_parameter::polygon_type_0 * polygon = (volatile global_parameter::polygon_type_0 *)&store_queue[store_queue_ix];
store_queue_ix += (sizeof (global_parameter::polygon_type_0));
polygon->parameter_control_word = parameter_control_word::para_type::polygon_or_modifier_volume
| parameter_control_word::list_type::opaque
| parameter_control_word::col_type::packed_color
| parameter_control_word::texture;
polygon->isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::greater
| isp_tsp_instruction_word::culling_mode::no_culling;
// Note that it is not possible to use
// ISP_TSP_INSTRUCTION_WORD::GOURAUD_SHADING in this isp_tsp_instruction_word,
// because `gouraud` is one of the bits overwritten by the value in
// parameter_control_word. See DCDBSysArc990907E.pdf page 200.
polygon->tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
| tsp_instruction_word::dst_alpha_instr::zero
| tsp_instruction_word::fog_control::no_fog
| tsp_instruction_word::filter_mode::point_sampled
| tsp_instruction_word::texture_shading_instruction::decal
| tsp_instruction_word::texture_u_size::_256
| tsp_instruction_word::texture_v_size::_256;
polygon->texture_control_word = texture_control_word::pixel_format::rgb565
| texture_control_word::scan_order::non_twiddled
| texture_control_word::texture_address(texture_address / 8);
// start store queue transfer of `polygon` to the TA
pref(polygon);
return store_queue_ix;
}
static inline uint32_t transfer_ta_vertex_triangle(uint32_t store_queue_ix,
float ax, float ay, float az, float au, float av, uint32_t ac,
float bx, float by, float bz, float bu, float bv, uint32_t bc,
float cx, float cy, float cz, float cu, float cv, uint32_t cc)
{
using namespace holly::ta;
using namespace holly::ta::parameter;
//
// TA polygon vertex transfer
//
volatile vertex_parameter::polygon_type_3 * vertex = (volatile vertex_parameter::polygon_type_3 *)&store_queue[store_queue_ix];
store_queue_ix += (sizeof (vertex_parameter::polygon_type_3)) * 3;
// bottom left
vertex[0].parameter_control_word = parameter_control_word::para_type::vertex_parameter;
vertex[0].x = ax;
vertex[0].y = ay;
vertex[0].z = az;
vertex[0].u = au;
vertex[0].v = av;
vertex[0].base_color = ac;
vertex[0].offset_color = 0;
// start store queue transfer of `vertex[0]` to the TA
pref(&vertex[0]);
// top center
vertex[1].parameter_control_word = parameter_control_word::para_type::vertex_parameter;
vertex[1].x = bx;
vertex[1].y = by;
vertex[1].z = bz;
vertex[1].u = bu;
vertex[1].v = bv;
vertex[1].base_color = bc;
vertex[1].offset_color = 0;
// start store queue transfer of `vertex[1]` to the TA
pref(&vertex[1]);
// bottom right
vertex[2].parameter_control_word = parameter_control_word::para_type::vertex_parameter
| parameter_control_word::end_of_strip;
vertex[2].x = cx;
vertex[2].y = cy;
vertex[2].z = cz;
vertex[2].u = cu;
vertex[2].v = cv;
vertex[2].base_color = cc;
vertex[2].offset_color = 0;
// start store queue transfer of `params[2]` to the TA
pref(&vertex[2]);
return store_queue_ix;
}
/*
These vertex and face definitions are a trivial transformation of the default
Blender cube, as exported by the .obj exporter (with triangulation enabled).
*/
struct vec3 {
float x;
float y;
float z;
};
struct vec2 {
float u;
float v;
};
static const vec3 cube_vertex_position[] = {
{ 1.0f, 1.0f, -1.0f },
{ 1.0f, -1.0f, -1.0f },
{ 1.0f, 1.0f, 1.0f },
{ 1.0f, -1.0f, 1.0f },
{ -1.0f, 1.0f, -1.0f },
{ -1.0f, -1.0f, -1.0f },
{ -1.0f, 1.0f, 1.0f },
{ -1.0f, -1.0f, 1.0f },
};
static const vec2 cube_vertex_texture[] = {
{ 1.0f, 0.0f },
{ 0.0f, 1.0f },
{ 0.0f, 0.0f },
{ 1.0f, 1.0f },
};
struct position_texture {
int position;
int texture;
};
struct face {
position_texture a;
position_texture b;
position_texture c;
};
/*
It is also possible to submit each cube face as a 4-vertex triangle strip, or
submit the entire cube as a single triangle strip.
Separate 3-vertex triangles are chosen to make this example more
straightforward, but this is not the best approach if high performance is
desired.
*/
static const face cube_faces[] = {
{{4, 0}, {2, 1}, {0, 2}},
{{2, 0}, {7, 1}, {3, 2}},
{{6, 0}, {5, 1}, {7, 2}},
{{1, 0}, {7, 1}, {5, 2}},
{{0, 0}, {3, 1}, {1, 2}},
{{4, 0}, {1, 1}, {5, 2}},
{{4, 0}, {6, 3}, {2, 1}},
{{2, 0}, {6, 3}, {7, 1}},
{{6, 0}, {4, 3}, {5, 1}},
{{1, 0}, {3, 3}, {7, 1}},
{{0, 0}, {2, 3}, {3, 1}},
{{4, 0}, {0, 3}, {1, 1}},
};
static const int cube_faces_length = (sizeof (cube_faces)) / (sizeof (cube_faces[0]));
#define cos(n) __builtin_cosf(n)
#define sin(n) __builtin_sinf(n)
static float theta = 0;
static inline vec3 vertex_rotate(vec3 v)
{
// to make the cube's appearance more interesting, rotate the vertex on two
// axes
float x0 = v.x;
float y0 = v.y;
float z0 = v.z;
float x1 = x0 * cos(theta) - z0 * sin(theta);
float y1 = y0;
float z1 = x0 * sin(theta) + z0 * cos(theta);
float x2 = x1;
float y2 = y1 * cos(theta) - z1 * sin(theta);
float z2 = y1 * sin(theta) + z1 * cos(theta);
return (vec3){x2, y2, z2};
}
static inline vec3 vertex_perspective_divide(vec3 v)
{
float w = 1.0f / (v.z + 3.0f);
return (vec3){v.x * w, v.y * w, w};
}
static inline vec3 vertex_screen_space(vec3 v)
{
return (vec3){
v.x * 240.f + 320.f,
v.y * 240.f + 240.f,
v.z,
};
}
void transfer_ta_cube(uint32_t texture_address)
{
{
using namespace sh7091;
using sh7091::sh7091;
// set the store queue destination address to the TA Polygon Converter FIFO
sh7091.CCN.QACR0 = sh7091::ccn::qacr0::address(ta_fifo_polygon_converter);
sh7091.CCN.QACR1 = sh7091::ccn::qacr1::address(ta_fifo_polygon_converter);
}
uint32_t store_queue_ix = 0;
store_queue_ix = transfer_ta_global_polygon(store_queue_ix, texture_address);
for (int face_ix = 0; face_ix < cube_faces_length; face_ix++) {
int ipa = cube_faces[face_ix].a.position;
int ipb = cube_faces[face_ix].b.position;
int ipc = cube_faces[face_ix].c.position;
vec3 vpa = vertex_screen_space(
vertex_perspective_divide(
vertex_rotate(cube_vertex_position[ipa])));
vec3 vpb = vertex_screen_space(
vertex_perspective_divide(
vertex_rotate(cube_vertex_position[ipb])));
vec3 vpc = vertex_screen_space(
vertex_perspective_divide(
vertex_rotate(cube_vertex_position[ipc])));
int ita = cube_faces[face_ix].a.texture;
int itb = cube_faces[face_ix].b.texture;
int itc = cube_faces[face_ix].c.texture;
vec2 vta = cube_vertex_texture[ita];
vec2 vtb = cube_vertex_texture[itb];
vec2 vtc = cube_vertex_texture[itc];
// vertex color is irrelevant in "decal" mode
uint32_t va_color = 0;
uint32_t vb_color = 0;
uint32_t vc_color = 0;
store_queue_ix = transfer_ta_vertex_triangle(store_queue_ix,
vpa.x, vpa.y, vpa.z, vta.u, vta.v, va_color,
vpb.x, vpb.y, vpb.z, vtb.u, vtb.v, vb_color,
vpc.x, vpc.y, vpc.z, vtc.u, vtc.v, vc_color);
}
store_queue_ix = transfer_ta_global_end_of_list(store_queue_ix);
}
const uint8_t texture[] __attribute__((aligned(4))) = {
#embed "texture/pavement_256x256.rgb565"
};
void transfer_texture(uint32_t texture_start)
{
// use 4-byte transfers to texture memory, for slightly increased transfer
// speed
//
// It would be even faster to use the SH4 store queue for this operation, or
// SH4 DMA.
sh7091::store_queue_transfer::copy((void *)&texture_memory64[texture_start], texture, (sizeof (texture)));
}
void main()
{
/*
a very simple memory map:
the ordering within texture memory is not significant, and could be
anything
*/
uint32_t framebuffer_start = 0x200000; // intentionally the same address that the boot rom used to draw the SEGA logo
uint32_t isp_tsp_parameter_start = 0x400000;
uint32_t region_array_start = 0x500000;
uint32_t object_list_start = 0x100000;
// these addresses are in "64-bit" texture memory address space:
uint32_t texture_start = 0x700000;
const int tile_y_num = 480 / 32;
const int tile_x_num = 640 / 32;
using namespace holly::core;
region_array::list_block_size list_block_size = {
.opaque = 8 * 4,
};
region_array::transfer(tile_x_num,
tile_y_num,
list_block_size,
region_array_start,
object_list_start);
transfer_background_polygon(isp_tsp_parameter_start);
//////////////////////////////////////////////////////////////////////////////
// transfer the texture image to texture ram
//////////////////////////////////////////////////////////////////////////////
transfer_texture(texture_start);
//////////////////////////////////////////////////////////////////////////////
// configure the TA
//////////////////////////////////////////////////////////////////////////////
using namespace holly;
using holly::holly;
// TA_GLOB_TILE_CLIP restricts which "object pointer blocks" are written
// to.
//
// This can also be used to implement "windowing", as long as the desired
// window size happens to be a multiple of 32 pixels. The "User Tile Clip" TA
// control parameter can also ~equivalently be used as many times as desired
// within a single TA initialization to produce an identical effect.
//
// See DCDBSysArc990907E.pdf page 183.
holly.TA_GLOB_TILE_CLIP = ta_glob_tile_clip::tile_y_num(tile_y_num - 1)
| ta_glob_tile_clip::tile_x_num(tile_x_num - 1);
// While CORE supports arbitrary-length object lists, the TA uses "object
// pointer blocks" as a memory allocation strategy. These fixed-length blocks
// can still have infinite length via "object pointer block links". This
// mechanism is illustrated in DCDBSysArc990907E.pdf page 188.
holly.TA_ALLOC_CTRL = ta_alloc_ctrl::opb_mode::increasing_addresses
| ta_alloc_ctrl::o_opb::_8x4byte;
// While building object lists, the TA contains an internal index (exposed as
// the read-only TA_ITP_CURRENT) for the next address that new ISP/TSP will be
// stored at. The initial value of this index is TA_ISP_BASE.
// reserve space in ISP/TSP parameters for the background parameter
using polygon = holly::core::parameter::isp_tsp_parameter<3>;
uint32_t ta_isp_base_offset = (sizeof (polygon)) * 1;
holly.TA_ISP_BASE = isp_tsp_parameter_start + ta_isp_base_offset;
holly.TA_ISP_LIMIT = isp_tsp_parameter_start + 0x100000;
// Similarly, the TA also contains, for up to 600 tiles, an internal index for
// the next address that an object list entry will be stored for each
// tile. These internal indicies are partially exposed via the read-only
// TA_OL_POINTERS.
holly.TA_OL_BASE = object_list_start;
// TA_OL_LIMIT, DCDBSysArc990907E.pdf page 385:
//
// > Because the TA may automatically store data in the address that is
// > specified by this register, it must not be used for other data. For
// > example, the address specified here must not be the same as the address
// > in the TA_ISP_BASE register.
holly.TA_OL_LIMIT = object_list_start + 0x100000 - 32;
//////////////////////////////////////////////////////////////////////////////
// configure CORE
//////////////////////////////////////////////////////////////////////////////
// REGION_BASE is the (texture memory-relative) address of the region array.
holly.REGION_BASE = region_array_start;
// PARAM_BASE is the (texture memory-relative) address of ISP/TSP parameters.
// Anything that references an ISP/TSP parameter does so relative to this
// address (and not relative to the beginning of texture memory).
holly.PARAM_BASE = isp_tsp_parameter_start;
// Set the offset of the background ISP/TSP parameter, relative to PARAM_BASE
// SKIP is related to the size of each vertex
uint32_t background_offset = 0;
holly.ISP_BACKGND_T = isp_backgnd_t::tag_address(background_offset / 4)
| isp_backgnd_t::tag_offset(0)
| isp_backgnd_t::skip(1);
// FB_W_SOF1 is the (texture memory-relative) address of the framebuffer that
// will be written to when a tile is rendered/flushed.
holly.FB_W_SOF1 = framebuffer_start;
// without waiting for rendering to actually complete, immediately display the
// framebuffer.
holly.FB_R_SOF1 = framebuffer_start;
// draw 500 frames of cube rotation
for (int i = 0; i < 500; i++) {
//////////////////////////////////////////////////////////////////////////////
// transfer cube to texture memory via the TA polygon converter FIFO
//////////////////////////////////////////////////////////////////////////////
// TA_LIST_INIT needs to be written (every frame) prior to the first FIFO
// write.
holly.TA_LIST_INIT = ta_list_init::list_init;
// dummy TA_LIST_INIT read; DCDBSysArc990907E.pdf in multiple places says this
// step is required.
(void)holly.TA_LIST_INIT;
transfer_ta_cube(texture_start);
//////////////////////////////////////////////////////////////////////////////
// wait for vertical synchronization (and the TA)
//////////////////////////////////////////////////////////////////////////////
while (!(spg_status::vsync(holly.SPG_STATUS)));
while (spg_status::vsync(holly.SPG_STATUS));
//////////////////////////////////////////////////////////////////////////////
// start the actual rasterization
//////////////////////////////////////////////////////////////////////////////
// start the actual render--the rendering process begins by interpreting the
// region array
holly.STARTRENDER = 1;
// increment theta for the cube rotation animation
// (used by the `vertex_rotate` function)
theta += 0.01f;
}
// return from main; this will effectively jump back to the serial loader
}
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