512 lines
17 KiB
C++
512 lines
17 KiB
C++
#include "memorymap.hpp"
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#include "holly/core/object_list_bits.hpp"
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#include "holly/core/region_array.hpp"
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#include "holly/core/region_array_bits.hpp"
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#include "holly/core/parameter_bits.hpp"
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#include "holly/core/parameter.hpp"
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#include "holly/ta/global_parameter.hpp"
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#include "holly/ta/vertex_parameter.hpp"
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#include "holly/ta/parameter_bits.hpp"
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#include "holly/holly.hpp"
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#include "holly/holly_bits.hpp"
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#include "sh7091/sh7091.hpp"
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#include "sh7091/sh7091_bits.hpp"
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#include "sh7091/pref.hpp"
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#include "sh7091/store_queue_transfer.hpp"
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#include "systembus/systembus.hpp"
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#include "systembus/systembus_bits.hpp"
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static inline void character(const char c)
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{
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using sh7091::sh7091;
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using namespace sh7091;
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// set the transmit trigger to `1 byte`--this changes the behavior of TDFE
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sh7091.SCIF.SCFCR2 = scif::scfcr2::ttrg::trigger_on_1_bytes;
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// wait for transmit fifo to become partially empty
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while ((sh7091.SCIF.SCFSR2 & scif::scfsr2::tdfe::bit_mask) == 0);
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// unset tdfe bit
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sh7091.SCIF.SCFSR2 = (uint16_t)(~scif::scfsr2::tdfe::bit_mask);
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sh7091.SCIF.SCFTDR2 = c;
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}
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static void string(const char * s)
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{
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while (*s != 0) {
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character(*s++);
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}
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}
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static void print_base16(uint32_t n, int len)
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{
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char buf[len];
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char * bufi = &buf[len - 1];
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while (bufi >= buf) {
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uint32_t nib = n & 0xf;
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n = n >> 4;
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if (nib > 9) {
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nib += (97 - 10);
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} else {
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nib += (48 - 0);
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}
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*bufi = nib;
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bufi -= 1;
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}
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for (int i = 0; i < len; i++) {
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character(buf[i]);
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}
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}
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struct vec3 {
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float x;
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float y;
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float z;
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};
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#include "model/suzanne.h"
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//#include "model/icosphere.h"
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void transfer_background_polygon(uint32_t isp_tsp_parameter_start)
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{
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using namespace holly::core::parameter;
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using parameter = isp_tsp_parameter<3>;
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volatile parameter * polygon = (volatile parameter *)&texture_memory32[isp_tsp_parameter_start];
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polygon->isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::always
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| isp_tsp_instruction_word::culling_mode::no_culling;
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polygon->tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
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| tsp_instruction_word::dst_alpha_instr::zero
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| tsp_instruction_word::fog_control::no_fog;
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polygon->texture_control_word = 0;
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polygon->vertex[0].x = 0.0f;
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polygon->vertex[0].y = 0.0f;
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polygon->vertex[0].z = 0.00001f;
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polygon->vertex[0].base_color = 0x000000;
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polygon->vertex[1].x = 32.0f;
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polygon->vertex[1].y = 0.0f;
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polygon->vertex[1].z = 0.00001f;
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polygon->vertex[1].base_color = 0x000000;
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polygon->vertex[2].x = 32.0f;
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polygon->vertex[2].y = 32.0f;
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polygon->vertex[2].z = 0.00001f;
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polygon->vertex[2].base_color = 0x000000;
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}
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static inline uint32_t transfer_ta_global_end_of_list(uint32_t store_queue_ix)
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{
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using namespace holly::ta;
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using namespace holly::ta::parameter;
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//
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// TA "end of list" global transfer
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//
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volatile global_parameter::end_of_list * end_of_list = (volatile global_parameter::end_of_list *)&store_queue[store_queue_ix];
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store_queue_ix += (sizeof (global_parameter::end_of_list));
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end_of_list->parameter_control_word = parameter_control_word::para_type::end_of_list;
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// start store queue transfer of `end_of_list` to the TA
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pref(end_of_list);
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return store_queue_ix;
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}
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static inline uint32_t transfer_ta_global_polygon(uint32_t store_queue_ix)
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{
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using namespace holly::core::parameter;
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using namespace holly::ta;
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using namespace holly::ta::parameter;
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//
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// TA polygon global transfer
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//
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volatile global_parameter::polygon_type_0 * polygon = (volatile global_parameter::polygon_type_0 *)&store_queue[store_queue_ix];
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store_queue_ix += (sizeof (global_parameter::polygon_type_0));
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polygon->parameter_control_word = parameter_control_word::para_type::polygon_or_modifier_volume
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| parameter_control_word::list_type::opaque
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| parameter_control_word::col_type::floating_color;
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polygon->isp_tsp_instruction_word = isp_tsp_instruction_word::depth_compare_mode::greater
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| isp_tsp_instruction_word::culling_mode::no_culling;
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// Note that it is not possible to use
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// ISP_TSP_INSTRUCTION_WORD::GOURAUD_SHADING in this isp_tsp_instruction_word,
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// because `gouraud` is one of the bits overwritten by the value in
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// parameter_control_word. See DCDBSysArc990907E.pdf page 200.
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polygon->tsp_instruction_word = tsp_instruction_word::src_alpha_instr::one
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| tsp_instruction_word::dst_alpha_instr::zero
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| tsp_instruction_word::fog_control::no_fog;
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polygon->texture_control_word = 0;
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// start store queue transfer of `polygon` to the TA
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pref(polygon);
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return store_queue_ix;
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}
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#define abs(n) __builtin_abs(n)
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#define cos(n) __builtin_cosf(n)
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#define sin(n) __builtin_sinf(n)
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static float theta = 0;
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static inline vec3 vertex_rotate(vec3 v)
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{
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// to make the models's appearance more interesting, rotate the vertex on two
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// axes
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float x0 = v.x;
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float y0 = v.y;
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float z0 = v.z;
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float x1 = x0 * cos(theta) - z0 * sin(theta);
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float y1 = y0;
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float z1 = x0 * sin(theta) + z0 * cos(theta);
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float x2 = x1;
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float y2 = y1 * cos(theta) - z1 * sin(theta);
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float z2 = y1 * sin(theta) + z1 * cos(theta);
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return (vec3){x2, y2, z2};
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}
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static inline vec3 vertex_perspective_divide(vec3 v)
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{
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float w = 1.0f / (v.z + 2.0f);
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return (vec3){v.x * w, v.y * w, w};
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}
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static inline vec3 vertex_screen_space(vec3 v)
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{
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return (vec3){
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v.x * 240.f + 320.f,
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v.y * 240.f + 240.f,
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v.z,
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};
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}
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static inline uint32_t transfer_ta_vertex_triangle(uint32_t store_queue_ix,
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float x, float y, float z,
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float r, float g, float b,
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bool end_of_strip)
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{
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using namespace holly::ta;
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using namespace holly::ta::parameter;
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//
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// TA polygon vertex transfer
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//
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volatile vertex_parameter::polygon_type_1 * vertex = (volatile vertex_parameter::polygon_type_1 *)&store_queue[store_queue_ix];
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store_queue_ix += (sizeof (vertex_parameter::polygon_type_1)) * 1;
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vertex[0].parameter_control_word = parameter_control_word::para_type::vertex_parameter
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| (end_of_strip ? parameter_control_word::end_of_strip : 0);
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vertex[0].x = x;
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vertex[0].y = y;
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vertex[0].z = z;
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vertex[0].base_color_alpha = 1.0;
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vertex[0].base_color_r = r;
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vertex[0].base_color_g = g;
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vertex[0].base_color_b = b;
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pref(vertex);
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return store_queue_ix;
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}
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static const vec3 colors[] = {
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{ 1.0, 0.0, 0.0 },
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{ 1.0, 0.5454545454545454, 0.0 },
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{ 0.9090909090909092, 1.0, 0.0 },
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{ 0.36363636363636376, 1.0, 0.0 },
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{ 0.0, 1.0, 0.18181818181818166 },
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{ 0.0, 1.0, 0.7272727272727271 },
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{ 0.0, 0.7272727272727275, 1.0 },
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{ 0.0, 0.18181818181818166, 1.0 },
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{ 0.3636363636363633, 0.0, 1.0 },
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{ 0.9090909090909092, 0.0, 1.0 },
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{ 1.0, 0.0, 0.5454545454545459 },
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{ 1.0, 0.0, 0.0 },
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{ 0.8500000000000001, 0.0, 0.0 },
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{ 0.8500000000000001, 0.4636363636363636, 0.0 },
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{ 0.7727272727272729, 0.8500000000000001, 0.0 },
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{ 0.30909090909090925, 0.8500000000000001, 0.0 },
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{ 0.0, 0.8500000000000001, 0.15454545454545443 },
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{ 0.0, 0.8500000000000001, 0.618181818181818 },
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{ 0.0, 0.6181818181818185, 0.8500000000000001 },
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{ 0.0, 0.15454545454545443, 0.8500000000000001 },
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{ 0.30909090909090886, 0.0, 0.8500000000000001 },
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{ 0.7727272727272729, 0.0, 0.8500000000000001 },
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{ 0.8500000000000001, 0.0, 0.463636363636364 },
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{ 0.8500000000000001, 0.0, 0.0 },
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{ 0.7, 0.0, 0.0 },
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{ 0.7, 0.3818181818181818, 0.0 },
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{ 0.6363636363636364, 0.7, 0.0 },
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{ 0.25454545454545463, 0.7, 0.0 },
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{ 0.0, 0.7, 0.12727272727272715 },
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{ 0.0, 0.7, 0.5090909090909089 },
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{ 0.0, 0.5090909090909093, 0.7 },
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{ 0.0, 0.12727272727272715, 0.7 },
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{ 0.2545454545454543, 0.0, 0.7 },
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{ 0.6363636363636364, 0.0, 0.7 },
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{ 0.7, 0.0, 0.38181818181818206 },
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{ 0.7, 0.0, 0.0 },
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{ 0.55, 0.0, 0.0 },
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{ 0.55, 0.3, 0.0 },
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{ 0.5000000000000001, 0.55, 0.0 },
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{ 0.2000000000000001, 0.55, 0.0 },
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{ 0.0, 0.55, 0.09999999999999992 },
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{ 0.0, 0.55, 0.3999999999999999 },
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{ 0.0, 0.4000000000000002, 0.55 },
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{ 0.0, 0.09999999999999992, 0.55 },
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{ 0.19999999999999984, 0.0, 0.55 },
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{ 0.5000000000000001, 0.0, 0.55 },
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{ 0.55, 0.0, 0.30000000000000027 },
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{ 0.55, 0.0, 0.0 },
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{ 0.39999999999999997, 0.0, 0.0 },
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{ 0.39999999999999997, 0.21818181818181814, 0.0 },
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{ 0.36363636363636365, 0.39999999999999997, 0.0 },
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{ 0.1454545454545455, 0.39999999999999997, 0.0 },
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{ 0.0, 0.39999999999999997, 0.07272727272727265 },
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{ 0.0, 0.39999999999999997, 0.2909090909090908 },
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{ 0.0, 0.290909090909091, 0.39999999999999997 },
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{ 0.0, 0.07272727272727265, 0.39999999999999997 },
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{ 0.1454545454545453, 0.0, 0.39999999999999997 },
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{ 0.36363636363636365, 0.0, 0.39999999999999997 },
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{ 0.39999999999999997, 0.0, 0.21818181818181834 },
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{ 0.39999999999999997, 0.0, 0.0 },
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{ 0.25, 0.0, 0.0 },
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{ 0.25, 0.13636363636363635, 0.0 },
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{ 0.2272727272727273, 0.25, 0.0 },
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{ 0.09090909090909094, 0.25, 0.0 },
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};
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static const int strips_length = (sizeof (strips)) / (sizeof (strips[0]));
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void transfer_ta_strips()
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{
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{
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using namespace sh7091;
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using sh7091::sh7091;
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// set the store queue destination address to the TA Polygon Converter FIFO
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sh7091.CCN.QACR0 = sh7091::ccn::qacr0::address(ta_fifo_polygon_converter);
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sh7091.CCN.QACR1 = sh7091::ccn::qacr1::address(ta_fifo_polygon_converter);
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}
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uint32_t store_queue_ix = 0;
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store_queue_ix = transfer_ta_global_polygon(store_queue_ix);
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int color_ix = 0;
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for (int strip_ix = 0; strip_ix < strips_length; strip_ix++) {
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int vertex_ix = strips[strip_ix];
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vec3 vp = vertex_screen_space(
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vertex_perspective_divide(
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vertex_rotate(vertices[abs(vertex_ix)])));
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const vec3& c = colors[color_ix];
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bool end_of_strip = vertex_ix < 0;
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store_queue_ix = transfer_ta_vertex_triangle(store_queue_ix,
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vp.x, vp.y, vp.z,
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c.x, c.y, c.z,
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end_of_strip);
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if (end_of_strip) {
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color_ix = (color_ix + 1) % 64;
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}
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}
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store_queue_ix = transfer_ta_global_end_of_list(store_queue_ix);
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}
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void main()
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{
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/*
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a very simple memory map:
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the ordering within texture memory is not significant, and could be
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anything
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*/
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uint32_t framebuffer_start = 0x200000; // intentionally the same address that the boot rom used to draw the SEGA logo
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uint32_t isp_tsp_parameter_start = 0x400000;
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uint32_t region_array_start = 0x500000;
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uint32_t object_list_start = 0x100000;
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const int tile_y_num = 480 / 32;
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const int tile_x_num = 640 / 32;
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using namespace holly::core;
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region_array::list_block_size list_block_size = {
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.opaque = 32 * 4,
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};
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region_array::transfer(tile_x_num,
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tile_y_num,
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list_block_size,
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region_array_start,
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object_list_start);
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transfer_background_polygon(isp_tsp_parameter_start);
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//////////////////////////////////////////////////////////////////////////////
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// configure the TA
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//////////////////////////////////////////////////////////////////////////////
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using namespace holly;
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using holly::holly;
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// TA_GLOB_TILE_CLIP restricts which "object pointer blocks" are written
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// to.
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//
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// This can also be used to implement "windowing", as long as the desired
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// window size happens to be a multiple of 32 pixels. The "User Tile Clip" TA
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// control parameter can also ~equivalently be used as many times as desired
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// within a single TA initialization to produce an identical effect.
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//
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// See DCDBSysArc990907E.pdf page 183.
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holly.TA_GLOB_TILE_CLIP = ta_glob_tile_clip::tile_y_num(tile_y_num - 1)
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| ta_glob_tile_clip::tile_x_num(tile_x_num - 1);
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// While CORE supports arbitrary-length object lists, the TA uses "object
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// pointer blocks" as a memory allocation strategy. These fixed-length blocks
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// can still have infinite length via "object pointer block links". This
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// mechanism is illustrated in DCDBSysArc990907E.pdf page 188.
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holly.TA_ALLOC_CTRL = ta_alloc_ctrl::opb_mode::increasing_addresses
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| ta_alloc_ctrl::o_opb::_32x4byte;
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// While building object lists, the TA contains an internal index (exposed as
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// the read-only TA_ITP_CURRENT) for the next address that new ISP/TSP will be
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// stored at. The initial value of this index is TA_ISP_BASE.
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// reserve space in ISP/TSP parameters for the background parameter
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using polygon = holly::core::parameter::isp_tsp_parameter<3>;
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uint32_t ta_isp_base_offset = (sizeof (polygon)) * 1;
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holly.TA_ISP_BASE = isp_tsp_parameter_start + ta_isp_base_offset;
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holly.TA_ISP_LIMIT = isp_tsp_parameter_start + 0x100000;
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// Similarly, the TA also contains, for up to 600 tiles, an internal index for
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// the next address that an object list entry will be stored for each
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// tile. These internal indicies are partially exposed via the read-only
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// TA_OL_POINTERS.
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holly.TA_OL_BASE = object_list_start;
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// TA_OL_LIMIT, DCDBSysArc990907E.pdf page 385:
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//
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// > Because the TA may automatically store data in the address that is
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// > specified by this register, it must not be used for other data. For
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// > example, the address specified here must not be the same as the address
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// > in the TA_ISP_BASE register.
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holly.TA_OL_LIMIT = object_list_start + 0x100000 - 32;
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holly.TA_NEXT_OPB_INIT = (object_list_start + 32 * 4 * tile_y_num * tile_x_num);
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//////////////////////////////////////////////////////////////////////////////
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// configure CORE
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//////////////////////////////////////////////////////////////////////////////
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// REGION_BASE is the (texture memory-relative) address of the region array.
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holly.REGION_BASE = region_array_start;
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// PARAM_BASE is the (texture memory-relative) address of ISP/TSP parameters.
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// Anything that references an ISP/TSP parameter does so relative to this
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// address (and not relative to the beginning of texture memory).
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holly.PARAM_BASE = isp_tsp_parameter_start;
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// Set the offset of the background ISP/TSP parameter, relative to PARAM_BASE
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// SKIP is related to the size of each vertex
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uint32_t background_offset = 0;
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holly.ISP_BACKGND_T = isp_backgnd_t::tag_address(background_offset / 4)
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| isp_backgnd_t::tag_offset(0)
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| isp_backgnd_t::skip(1);
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|
|
|
// 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 < 5000; 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_strips();
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
// 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
|
|
using systembus::systembus;
|
|
using namespace systembus;
|
|
systembus.ISTERR = 0xffffffff;
|
|
|
|
holly.STARTRENDER = 1;
|
|
|
|
while ((systembus.ISTNRM & istnrm::end_of_render_tsp) == 0) {
|
|
if (systembus.ISTERR) {
|
|
string("ISTERR: ");
|
|
print_base16(systembus.ISTERR, 8);
|
|
string("\n ");
|
|
return;
|
|
}
|
|
}
|
|
systembus.ISTNRM = istnrm::end_of_render_tsp
|
|
| istnrm::end_of_render_isp
|
|
| istnrm::end_of_render_video;
|
|
|
|
// increment theta for the cube rotation animation
|
|
// (used by the `vertex_rotate` function)
|
|
theta += 0.01f;
|
|
}
|
|
|
|
string("return\n ");
|
|
// return from main; this will effectively jump back to the serial loader
|
|
}
|