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example/font_bitmap: remove unintentional padding between characters

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At 4bpp, each 8×8px character only requires (8 * 8 / 2) bytes of
texture ram.
This commit is contained in:
Zack Buhman 2024-04-15 18:16:13 +08:00
parent 1a7a8c4484
commit bd33fbf2e4
1 changed files with 6 additions and 5 deletions
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11
example/font_bitmap.cpp
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@ -110,10 +110,11 @@ uint32_t transform(uint32_t * ta_parameter_buf, const char * s, const uint32_t l
| tsp_instruction_word::texture_u_size::from_int(8) | tsp_instruction_word::texture_u_size::from_int(8)
| tsp_instruction_word::texture_v_size::from_int(8); | tsp_instruction_word::texture_v_size::from_int(8);
const uint32_t character_offset = ((8 * 8) / 2) * (s[string_ix] - ' ');
const uint32_t texture_address = (offsetof (struct texture_memory_alloc, texture)); const uint32_t texture_address = (offsetof (struct texture_memory_alloc, texture));
const uint32_t texture_control_word = texture_control_word::pixel_format::_4bpp_palette const uint32_t texture_control_word = texture_control_word::pixel_format::_4bpp_palette
| texture_control_word::scan_order::twiddled | texture_control_word::scan_order::twiddled
| texture_control_word::texture_address((texture_address + 8 * 8 * (s[string_ix] - ' ')) / 8); | texture_control_word::texture_address((texture_address + character_offset) / 8);
parameter.append<ta_global_parameter::polygon_type_0>() = parameter.append<ta_global_parameter::polygon_type_0>() =
ta_global_parameter::polygon_type_0(parameter_control_word, ta_global_parameter::polygon_type_0(parameter_control_word,
@ -131,9 +132,9 @@ uint32_t transform(uint32_t * ta_parameter_buf, const char * s, const uint32_t l
float y = strip_vertices[i].y; float y = strip_vertices[i].y;
float z = strip_vertices[i].z; float z = strip_vertices[i].z;
x *= 32.f; x *= 8.f;
y *= 32.f; y *= 8.f;
x += 64.f + 32 * string_ix; x += 64.f + 8 * string_ix;
y += 240.f; y += 240.f;
z = 1.f / (z + 10.f); z = 1.f / (z + 10.f);
@ -189,7 +190,7 @@ inline void inflate_character(const uint8_t * src, const uint8_t c)
auto mem = reinterpret_cast<volatile texture_memory_alloc *>(texture_memory64); auto mem = reinterpret_cast<volatile texture_memory_alloc *>(texture_memory64);
auto texture = reinterpret_cast<volatile uint32_t *>(mem->texture); auto texture = reinterpret_cast<volatile uint32_t *>(mem->texture);
uint32_t offset = 8 * 8 * character_index; uint32_t offset = ((8 * 8) / 2) * character_index;
/* /*
union { union {