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https://github.com/holub/mame
synced 2025-05-18 11:39:29 +03:00
i8275: Improve and simplify handling of field attributes
This commit is contained in:
AJR
parent
4da41acc0d
commit
0df94f61ef
@ -114,18 +114,14 @@ i8275_device::i8275_device(const machine_config &mconfig, device_type type, cons
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m_dma_last_char(0),
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m_buffer_dma(0),
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m_lpen(0),
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m_hlgt(0),
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m_vsp(0),
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m_gpa(0),
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m_rvv(0),
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m_lten(0),
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m_scanline(0),
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m_dma_stop(false),
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m_end_of_screen(false),
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m_preset(false),
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m_cursor_blink(0),
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m_char_blink(0),
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m_stored_attr(0)
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m_stored_attr(0),
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m_field_attr(0)
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{
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memset(m_param, 0x00, sizeof(m_param));
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}
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@ -175,11 +171,6 @@ void i8275_device::device_start()
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save_item(NAME(m_dma_last_char));
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save_item(NAME(m_buffer_dma));
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save_item(NAME(m_lpen));
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save_item(NAME(m_hlgt));
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save_item(NAME(m_vsp));
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save_item(NAME(m_gpa));
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save_item(NAME(m_rvv));
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save_item(NAME(m_lten));
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save_item(NAME(m_scanline));
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save_item(NAME(m_irq_scanline));
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save_item(NAME(m_vrtc_scanline));
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@ -190,6 +181,7 @@ void i8275_device::device_start()
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save_item(NAME(m_cursor_blink));
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save_item(NAME(m_char_blink));
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save_item(NAME(m_stored_attr));
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save_item(NAME(m_field_attr));
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}
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@ -220,11 +212,7 @@ void i8275_device::vrtc_start()
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if (m_status & ST_VE)
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{
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// reset field attributes
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m_hlgt = 0;
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m_vsp = 0;
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m_gpa = 0;
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m_rvv = 0;
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m_lten = 0;
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m_field_attr = 0;
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m_buffer_idx = CHARACTERS_PER_ROW;
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m_dma_stop = false;
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@ -347,122 +335,104 @@ void i8275_device::device_timer(emu_timer &timer, device_timer_id id, int param,
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bool end_of_row = false;
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bool blank_row = (UNDERLINE >= 8) && ((lc == 0) || (lc == SCANLINES_PER_ROW - 1));
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int fifo_idx = 0;
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m_hlgt = (m_stored_attr & FAC_H) ? 1 : 0;
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m_vsp = (m_stored_attr & FAC_B) ? 1 : 0;
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m_gpa = (m_stored_attr & FAC_GG) >> 2;
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m_rvv = (m_stored_attr & FAC_R) ? 1 : 0;
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m_lten = ((m_stored_attr & FAC_U) != 0) && (lc == UNDERLINE) ? 1 : 0;
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m_field_attr = m_stored_attr;
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for (int sx = 0; sx < CHARACTERS_PER_ROW; sx++)
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{
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int m_lineattr = 0;
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int lten = 0;
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int vsp = 0;
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int rvv = 0;
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int lineattr = 0;
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uint8_t data = (end_of_row || m_end_of_screen) ? 0 : m_buffer[!m_buffer_dma][sx];
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uint8_t attr = m_field_attr;
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if (data & 0x80)
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if ((data & 0xc0) == 0x80)
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{
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if ((data & 0xc0) == 0x80)
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// field attribute code
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m_field_attr = data & (FAC_H | FAC_B | FAC_GG | FAC_R | FAC_U);
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if (!VISIBLE_FIELD_ATTRIBUTE)
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{
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// field attribute code
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m_hlgt = (data & FAC_H) ? 1 : 0;
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m_vsp = (data & FAC_B) ? 1 : 0;
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m_gpa = (data & FAC_GG) >> 2;
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m_rvv = (data & FAC_R) ? 1 : 0;
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m_lten = ((data & FAC_U) != 0) && (lc == UNDERLINE) ? 1 : 0;
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if ((SCANLINES_PER_ROW - lc)==1)
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m_stored_attr = data;
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attr = m_field_attr;
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data = m_fifo[!m_buffer_dma][fifo_idx];
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if (!VISIBLE_FIELD_ATTRIBUTE)
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{
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data = m_fifo[!m_buffer_dma][fifo_idx];
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fifo_idx++;
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fifo_idx &= 0xf;
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fifo_idx++;
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fifo_idx &= 0xf;
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}
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else
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{
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vsp = 1;
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rvv = m_rvv; // cancel out reverse video for attribute character itself
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}
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if (blank_row)
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attr |= FAC_B;
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else if (!(m_char_blink < 32))
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attr &= ~FAC_B;
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if (lc != UNDERLINE)
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attr &= ~FAC_U;
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}
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else
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{
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if ((data & 0xf0) == 0xf0)
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{
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// special control character
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switch (data)
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{
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case SCC_END_OF_ROW:
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case SCC_END_OF_ROW_DMA:
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end_of_row = true;
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break;
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case SCC_END_OF_SCREEN:
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case SCC_END_OF_SCREEN_DMA:
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m_end_of_screen = true;
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break;
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}
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//vsp = 1;
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}
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else
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{
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// character attribute code
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m_hlgt = (data & CA_H) ? 1 : 0;
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m_vsp = (data & CA_B) ? 1 : 0;
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uint8_t ca;
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int cccc = (data >> 2) & 0x0f;
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if (line_counter < UNDERLINE)
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{
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ca = character_attribute[0][cccc];
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}
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else if (line_counter == UNDERLINE)
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{
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ca = character_attribute[1][cccc];
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}
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else
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{
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ca = character_attribute[2][cccc];
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}
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m_lten = (ca & CA_LTEN) ? 1 : 0;
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m_vsp = (ca & CA_VSP) ? 1 : 0;
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m_lineattr = ca >> 2;
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}
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// simply blank the attribute character itself
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attr = FAC_B;
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}
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}
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if (!vsp && m_vsp)
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else if (data >= 0xf0 || end_of_row || m_end_of_screen)
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{
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vsp = (m_char_blink < 32) ? 1 : 0;
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// special control character
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switch (data)
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{
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case SCC_END_OF_ROW:
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case SCC_END_OF_ROW_DMA:
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end_of_row = true;
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break;
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case SCC_END_OF_SCREEN:
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case SCC_END_OF_SCREEN_DMA:
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m_end_of_screen = true;
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break;
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}
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attr = FAC_B;
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}
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else if (data >= 0xc0)
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{
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// character attribute code
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attr = data & (m_char_blink < 32 ? (CA_H | CA_B) : CA_H);
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uint8_t ca;
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int cccc = (data >> 2) & 0x0f;
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if (lc < UNDERLINE)
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{
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ca = character_attribute[0][cccc];
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}
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else if (lc == UNDERLINE)
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{
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ca = character_attribute[1][cccc];
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}
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else
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{
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ca = character_attribute[2][cccc];
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}
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if (ca & CA_LTEN)
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attr |= FAC_U;
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if (ca & CA_VSP)
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attr |= FAC_B;
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lineattr = ca >> 2;
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}
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else
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{
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if (blank_row)
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attr |= FAC_B;
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else if (!(m_char_blink < 32))
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attr &= ~FAC_B;
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if (lc != UNDERLINE)
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attr &= ~FAC_U;
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}
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if ((rc == m_param[REG_CUR_ROW]) && (sx == m_param[REG_CUR_COL]))
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{
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int vis = 1;
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if (!(CURSOR_FORMAT & 0x02))
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if ((CURSOR_FORMAT & 0x02) || (m_cursor_blink < 16))
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{
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vis = (m_cursor_blink < 16) ? 1 : 0;
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if (CURSOR_FORMAT & 0x01)
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attr |= (lc == UNDERLINE) ? FAC_U : 0;
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else
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attr ^= FAC_R;
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}
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if (CURSOR_FORMAT & 0x01)
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{
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lten = (lc == UNDERLINE) ? vis : 0;
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}
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else
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{
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rvv = vis;
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}
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}
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if (blank_row || end_of_row || m_end_of_screen)
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{
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vsp = 1;
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}
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if (!m_display_cb.isnull())
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@ -471,14 +441,17 @@ void i8275_device::device_timer(emu_timer &timer, device_timer_id id, int param,
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m_scanline, // y position on screen
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line_counter, // current line of char
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(data & 0x7f), // char code to be displayed
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m_lineattr, // line attribute code
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lten | m_lten, // light enable signal
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rvv ^ m_rvv, // reverse video signal
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vsp, // video suppression
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m_gpa, // general purpose attribute code
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m_hlgt // highlight
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lineattr, // line attribute code
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(attr & FAC_U) ? 1 : 0, // light enable signal
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(attr & FAC_R) ? 1 : 0, // reverse video signal
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(attr & FAC_B) ? 1 : 0, // video suppression
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(attr & FAC_GG) >> 2, // general purpose attribute code
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(attr & FAC_H) ? 1 : 0 // highlight
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);
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}
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if ((SCANLINES_PER_ROW - lc) == 1)
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m_stored_attr = m_field_attr;
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}
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m_scanline++;
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@ -202,12 +202,6 @@ protected:
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int m_lpen;
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int m_hlgt;
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int m_vsp;
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int m_gpa;
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int m_rvv;
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int m_lten;
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int m_scanline;
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int m_irq_scanline;
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int m_vrtc_scanline;
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@ -219,6 +213,7 @@ protected:
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int m_cursor_blink;
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int m_char_blink;
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uint8_t m_stored_attr;
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uint8_t m_field_attr;
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// timers
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emu_timer *m_hrtc_on_timer;
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