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https://github.com/ekeeke/Genesis-Plus-GX.git
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[Core/VDP] improved Mode 5 sprites rendering (fixes "Overdrive" demo)
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@ -1172,7 +1172,7 @@ void system_frame_sms(int do_skip)
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/* Sprites are still processed during vertical borders */
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if (reg[1] & 0x40)
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{
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render_obj(bitmap.viewport.w);
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render_obj(1);
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}
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}
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@ -1349,7 +1349,7 @@ void system_frame_sms(int do_skip)
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if ((system_hw < SYSTEM_MD) && (line > (lines_per_frame - 16)))
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{
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/* Sprites are still processed during top border */
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render_obj(bitmap.viewport.w);
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render_obj((line - lines_per_frame) & 1);
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parse_satb(line - lines_per_frame);
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}
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@ -85,6 +85,7 @@ uint8 vdp_pal; /* 1: PAL , 0: NTSC (default) */
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uint16 v_counter; /* Vertical counter */
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uint16 vc_max; /* Vertical counter overflow value */
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uint16 lines_per_frame; /* PAL: 313 lines, NTSC: 262 lines */
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uint16 max_sprite_pixels; /* Max. sprites pixels per line (parsing & rendering) */
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int32 fifo_write_cnt; /* VDP FIFO write count */
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uint32 fifo_slots; /* VDP FIFO access slot count */
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uint32 hvc_latch; /* latched HV counter */
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@ -278,6 +279,9 @@ void vdp_reset(void)
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bitmap.viewport.ow = 256;
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bitmap.viewport.oh = 192;
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/* default sprite pixel width */
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max_sprite_pixels = 256;
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/* default overscan area */
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if ((system_hw == SYSTEM_GG) && !config.gg_extra)
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{
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@ -1575,21 +1579,28 @@ static void vdp_reg_w(unsigned int r, unsigned int d, unsigned int cycles)
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if ((r & 0x40) && (v_counter < bitmap.viewport.h))
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{
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/* Cycle offset vs HBLANK */
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int offset = cycles - mcycles_vdp - 860;
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if (offset <= 0)
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int offset = cycles - mcycles_vdp;
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if (offset <= 860)
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{
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/* If display was disabled during HBLANK (Mickey Mania 3D level), sprite rendering is limited */
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if ((d & 0x40) && (object_count > 5) && (offset >= -500))
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/* Sprite rendering is limited if display was disabled during HBLANK (Mickey Mania 3d level, Overdrive Demo) */
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if (d & 0x40)
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{
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object_count = 5;
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/* NB: This is not 100% accurate. On real hardware, the maximal number of rendered sprites pixels */
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/* for the current line (normally 256 or 320 pixels) but also the maximal number of pre-processed */
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/* sprites for the next line (normally 64 or 80 sprites) are both reduced depending on the amount */
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/* of cycles spent with display disabled. Here we only reduce them by a fixed amount when display */
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/* has been reenabled after a specific point within HBLANK. */
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if (offset > 360)
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{
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max_sprite_pixels = 128;
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}
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}
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/* Redraw entire line (Legend of Galahad, Lemmings 2, Formula One, Kawasaki Super Bike, Deadly Moves,...) */
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render_line(v_counter);
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#ifdef LOGVDP
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error("Line redrawn (%d sprites) \n",object_count);
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#endif
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/* Restore default */
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max_sprite_pixels = 256 + ((reg[12] & 1) << 6);
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}
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else if (system_hw & SYSTEM_MD)
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{
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@ -1597,20 +1608,17 @@ static void vdp_reg_w(unsigned int r, unsigned int d, unsigned int cycles)
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if (reg[12] & 1)
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{
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/* dot clock = MCLK / 8 */
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offset = (offset / 8);
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offset = ((offset - 860) / 8) + 16;
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}
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else
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{
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/* dot clock = MCLK / 10 */
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offset = (offset / 10) + 16;
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offset = ((offset - 860) / 10) + 16;
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}
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/* Line is partially blanked (Nigel Mansell's World Championship Racing , Ren & Stimpy Show, ...) */
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if (offset < bitmap.viewport.w)
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{
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#ifdef LOGVDP
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error("Line %d redrawn from pixel %d\n",v_counter,offset);
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#endif
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if (d & 0x40)
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{
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render_line(v_counter);
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@ -1974,6 +1982,9 @@ static void vdp_reg_w(unsigned int r, unsigned int d, unsigned int cycles)
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/* Update clipping */
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window_clip(reg[17], 1);
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/* Max. sprite pixels per line */
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max_sprite_pixels = 320;
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}
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else
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{
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@ -1988,6 +1999,9 @@ static void vdp_reg_w(unsigned int r, unsigned int d, unsigned int cycles)
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/* Update clipping */
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window_clip(reg[17], 0);
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/* Max. sprite pixels per line */
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max_sprite_pixels = 256;
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}
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/* Active display width modified during HBLANK (Bugs Bunny Double Trouble) */
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@ -74,6 +74,7 @@ extern uint16 v_counter;
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extern uint16 vc_max;
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extern uint16 vscroll;
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extern uint16 lines_per_frame;
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extern uint16 max_sprite_pixels;
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extern int32 fifo_write_cnt;
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extern uint32 fifo_slots;
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extern uint32 hvc_latch;
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File diff suppressed because it is too large
Load Diff
@ -43,7 +43,6 @@
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#define _RENDER_H_
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/* Global variables */
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extern uint8 object_count;
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extern uint16 spr_col;
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/* Function prototypes */
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@ -53,24 +52,24 @@ extern void render_line(int line);
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extern void blank_line(int line, int offset, int width);
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extern void remap_line(int line);
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extern void window_clip(unsigned int data, unsigned int sw);
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extern void render_bg_m0(int line, int width);
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extern void render_bg_m1(int line, int width);
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extern void render_bg_m1x(int line, int width);
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extern void render_bg_m2(int line, int width);
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extern void render_bg_m3(int line, int width);
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extern void render_bg_m3x(int line, int width);
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extern void render_bg_inv(int line, int width);
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extern void render_bg_m4(int line, int width);
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extern void render_bg_m5(int line, int width);
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extern void render_bg_m5_vs(int line, int width);
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extern void render_bg_m5_im2(int line, int width);
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extern void render_bg_m5_im2_vs(int line, int width);
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extern void render_obj_tms(int max_width);
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extern void render_obj_m4(int max_width);
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extern void render_obj_m5(int max_width);
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extern void render_obj_m5_ste(int max_width);
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extern void render_obj_m5_im2(int max_width);
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extern void render_obj_m5_im2_ste(int max_width);
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extern void render_bg_m0(int line);
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extern void render_bg_m1(int line);
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extern void render_bg_m1x(int line);
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extern void render_bg_m2(int line);
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extern void render_bg_m3(int line);
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extern void render_bg_m3x(int line);
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extern void render_bg_inv(int line);
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extern void render_bg_m4(int line);
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extern void render_bg_m5(int line);
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extern void render_bg_m5_vs(int line);
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extern void render_bg_m5_im2(int line);
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extern void render_bg_m5_im2_vs(int line);
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extern void render_obj_tms(int line);
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extern void render_obj_m4(int line);
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extern void render_obj_m5(int line);
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extern void render_obj_m5_ste(int line);
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extern void render_obj_m5_im2(int line);
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extern void render_obj_m5_im2_ste(int line);
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extern void parse_satb_tms(int line);
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extern void parse_satb_m4(int line);
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extern void parse_satb_m5(int line);
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@ -80,8 +79,8 @@ extern void color_update_m4(int index, unsigned int data);
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extern void color_update_m5(int index, unsigned int data);
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/* Function pointers */
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extern void (*render_bg)(int line, int width);
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extern void (*render_obj)(int max_width);
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extern void (*render_bg)(int line);
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extern void (*render_obj)(int line);
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extern void (*parse_satb)(int line);
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extern void (*update_bg_pattern_cache)(int index);
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