dreamcast/holly/background.cpp

124 lines
3.6 KiB
C++

#include <cstdint>
#include "isp_tsp.hpp"
#include "texture_memory_alloc.hpp"
#include "memorymap.hpp"
struct vertex_parameter {
float x;
float y;
float z;
uint32_t base_color;
}; // ISP_BACKGND_T skip(1)
struct textured_vertex_parameter {
float x;
float y;
float z;
float u;
float v;
uint32_t base_color;
}; // ISP_BACKGND_T skip(3)
template<typename T>
struct isp_tsp_parameter {
uint32_t isp_tsp_instruction_word;
uint32_t tsp_instruction_word;
uint32_t texture_control_word;
T vertex[3];
};
static_assert((sizeof (isp_tsp_parameter<vertex_parameter>)) == (4 * 3 + 3) * 4);
void background_parameter_textured(const uint32_t background_start,
const int texture_u_size,
const int texture_v_size,
const uint32_t texture_address)
{
auto parameter = reinterpret_cast<volatile isp_tsp_parameter<textured_vertex_parameter> *>
(&texture_memory32[background_start / 4]);
parameter->isp_tsp_instruction_word
= isp_tsp_instruction_word::texture
| isp_tsp_instruction_word::depth_compare_mode::always
| isp_tsp_instruction_word::culling_mode::no_culling
;
parameter->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::bilinear_filter
| tsp_instruction_word::texture_shading_instruction::decal
| tsp_instruction_word::texture_u_size::from_int(texture_u_size)
| tsp_instruction_word::texture_v_size::from_int(texture_v_size)
;
parameter->texture_control_word
= texture_control_word::pixel_format::_565
| texture_control_word::scan_order::twiddled
| texture_control_word::texture_address(texture_address / 8);
parameter->vertex[0].x = 0.f;
parameter->vertex[0].y = 480.f;
parameter->vertex[0].z = 1.f/100000;
parameter->vertex[0].u = 0.0;
parameter->vertex[0].v = 1.0;
parameter->vertex[0].base_color = 0xffffffff;
parameter->vertex[1].x = 0.f;
parameter->vertex[1].y = 0.f;
parameter->vertex[1].z = 1.f/100000;
parameter->vertex[1].u = 0.0;
parameter->vertex[1].v = 0.0;
parameter->vertex[1].base_color = 0xffffffff;
parameter->vertex[2].x = 639.f;
parameter->vertex[2].y = 479.f;
parameter->vertex[2].z = 1.f/100000;
parameter->vertex[2].u = 1.0;
parameter->vertex[2].v = 1.0;
parameter->vertex[2].base_color = 0xffffffff;
}
void background_parameter2(const uint32_t background_start,
const uint32_t color)
{
auto parameter = reinterpret_cast<volatile isp_tsp_parameter<vertex_parameter> *>
(&texture_memory32[background_start / 4]);
parameter->isp_tsp_instruction_word
= isp_tsp_instruction_word::depth_compare_mode::always
| isp_tsp_instruction_word::culling_mode::no_culling;
parameter->tsp_instruction_word
= tsp_instruction_word::src_alpha_instr::one
| tsp_instruction_word::dst_alpha_instr::zero
| tsp_instruction_word::fog_control::no_fog;
parameter->texture_control_word
= 0;
parameter->vertex[0].x = 0.f;
parameter->vertex[0].y = 0.f;
parameter->vertex[0].z = 1.f/100000;
parameter->vertex[0].base_color = color;
parameter->vertex[1].x = 639.f;
parameter->vertex[1].y = 0.f;
parameter->vertex[1].z = 1.f/100000;
parameter->vertex[1].base_color = color;
parameter->vertex[2].x = 639.f;
parameter->vertex[2].y = 479.f;
parameter->vertex[2].z = 1.f/100000;
parameter->vertex[2].base_color = color;
}
void background_parameter(const uint32_t color)
{
background_parameter2(texture_memory_alloc::background.start,
color);
}