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video.c
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/* gameplaySP
*
* Copyright (C) 2006 Exophase <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "common.h"
#include "3ds/draw.h"
const u32 video_scale = 1;
#define screen_texture *(u16*)&gfxGetFramebuffer(GFX_TOP, GFX_LEFT, NULL, NULL)[0]
#define current_screen_texture *(u16*)&gfxGetFramebuffer(GFX_TOP, GFX_LEFT, NULL, NULL)[0]
#define screen_pixels *(u16*)&gfxGetFramebuffer(GFX_TOP, GFX_LEFT, NULL, NULL)[0]
static u32 screen_pitch = 240*3;
#define get_screen_pixels() \
screen_pixels \
#define get_screen_pitch() \
screen_pitch
#define FONT_HEIGHT 10
#define color16(red, green, blue) \
((red & 0x1F) << 11) | ((green & 0x1F) << 6) | ((blue & 0x1F) << 1) \
static void render_scanline_conditional_tile(u32 start, u32 end, u16 *scanline,
u32 enable_flags, u32 dispcnt, u32 bldcnt, const tile_layer_render_struct
*layer_renderers);
static void render_scanline_conditional_bitmap(u32 start, u32 end, u16 *scanline,
u32 enable_flags, u32 dispcnt, u32 bldcnt, const bitmap_layer_render_struct
*layer_renderers);
#define no_op \
// This old version is not necessary if the palette is either being converted
// transparently or the ABGR 1555 format is being used natively. The direct
// version (without conversion) is much faster.
#define tile_lookup_palette_full(palette, source) \
current_pixel = palette[source]; \
convert_palette(current_pixel) \
#define tile_lookup_palette(palette, source) \
current_pixel = palette[source]; \
#ifdef RENDER_COLOR16_NORMAL
#define tile_expand_base_normal(index) \
tile_expand_base_color16(index) \
#else
#define tile_expand_base_normal(index) \
tile_lookup_palette(palette, current_pixel); \
dest_ptr[index] = current_pixel \
#endif
#define tile_expand_transparent_normal(index) \
tile_expand_base_normal(index) \
#define tile_expand_copy(index) \
dest_ptr[index] = copy_ptr[index] \
#define advance_dest_ptr_base(delta) \
dest_ptr += delta \
#define advance_dest_ptr_transparent(delta) \
advance_dest_ptr_base(delta) \
#define advance_dest_ptr_copy(delta) \
advance_dest_ptr_base(delta); \
copy_ptr += delta \
#define color_combine_mask_a(layer) \
((io_registers[REG_BLDCNT] >> layer) & 0x01) \
// For color blending operations, will create a mask that has in bit
// 10 if the layer is target B, and bit 9 if the layer is target A.
#define color_combine_mask(layer) \
(color_combine_mask_a(layer) | \
((io_registers[REG_BLDCNT] >> (layer + 7)) & 0x02)) << 9 \
// For alpha blending renderers, draw the palette index (9bpp) and
// layer bits rather than the raw RGB. For the base this should write to
// the 32bit location directly.
#define tile_expand_base_alpha(index) \
dest_ptr[index] = current_pixel | pixel_combine \
#define tile_expand_base_bg(index) \
dest_ptr[index] = bg_combine \
// For layered (transparent) writes this should shift the "stack" and write
// to the bottom. This will preserve the topmost pixel and the most recent
// one.
#define tile_expand_transparent_alpha(index) \
dest_ptr[index] = (dest_ptr[index] << 16) | current_pixel | pixel_combine \
// OBJ should only shift if the top isn't already OBJ
#define tile_expand_transparent_alpha_obj(index) \
dest = dest_ptr[index]; \
if(dest & 0x00000100) \
{ \
dest_ptr[index] = (dest & 0xFFFF0000) | current_pixel | pixel_combine; \
} \
else \
{ \
dest_ptr[index] = (dest << 16) | current_pixel | pixel_combine; \
} \
// For color effects that don't need to preserve the previous layer.
// The color32 version should be used with 32bit wide dest_ptr so as to be
// compatible with alpha combine on top of it.
#define tile_expand_base_color16(index) \
dest_ptr[index] = current_pixel | pixel_combine \
#define tile_expand_transparent_color16(index) \
tile_expand_base_color16(index) \
#define tile_expand_base_color32(index) \
tile_expand_base_color16(index) \
#define tile_expand_transparent_color32(index) \
tile_expand_base_color16(index) \
// Operations for isolation 8bpp pixels within 32bpp pixel blocks.
#define tile_8bpp_pixel_op_mask(op_param) \
current_pixel = current_pixels & 0xFF \
#define tile_8bpp_pixel_op_shift_mask(shift) \
current_pixel = (current_pixels >> shift) & 0xFF \
#define tile_8bpp_pixel_op_shift(shift) \
current_pixel = current_pixels >> shift \
#define tile_8bpp_pixel_op_none(shift) \
// Base should always draw raw in 8bpp mode; color 0 will be drawn where
// color 0 is.
#define tile_8bpp_draw_base_normal(index) \
tile_expand_base_normal(index) \
#define tile_8bpp_draw_base_alpha(index) \
if(current_pixel) \
{ \
tile_expand_base_alpha(index); \
} \
else \
{ \
tile_expand_base_bg(index); \
} \
#define tile_8bpp_draw_base_color16(index) \
tile_8bpp_draw_base_alpha(index) \
#define tile_8bpp_draw_base_color32(index) \
tile_8bpp_draw_base_alpha(index) \
#define tile_8bpp_draw_base(index, op, op_param, alpha_op) \
tile_8bpp_pixel_op_##op(op_param); \
tile_8bpp_draw_base_##alpha_op(index) \
// Transparent (layered) writes should only replace what is there if the
// pixel is not transparent (zero)
#define tile_8bpp_draw_transparent(index, op, op_param, alpha_op) \
tile_8bpp_pixel_op_##op(op_param); \
if(current_pixel) \
{ \
tile_expand_transparent_##alpha_op(index); \
} \
#define tile_8bpp_draw_copy(index, op, op_param, alpha_op) \
tile_8bpp_pixel_op_##op(op_param); \
if(current_pixel) \
{ \
tile_expand_copy(index); \
} \
// Get the current tile from the map in 8bpp mode
#define get_tile_8bpp() \
current_tile = *map_ptr; \
tile_ptr = tile_base + ((current_tile & 0x3FF) * 64) \
// Draw half of a tile in 8bpp mode, for base renderer
#define tile_8bpp_draw_four_noflip(index, combine_op, alpha_op) \
tile_8bpp_draw_##combine_op(index + 0, mask, 0, alpha_op); \
tile_8bpp_draw_##combine_op(index + 1, shift_mask, 8, alpha_op); \
tile_8bpp_draw_##combine_op(index + 2, shift_mask, 16, alpha_op); \
tile_8bpp_draw_##combine_op(index + 3, shift, 24, alpha_op) \
// Like the above, but draws the half-tile horizontally flipped
#define tile_8bpp_draw_four_flip(index, combine_op, alpha_op) \
tile_8bpp_draw_##combine_op(index + 3, mask, 0, alpha_op); \
tile_8bpp_draw_##combine_op(index + 2, shift_mask, 8, alpha_op); \
tile_8bpp_draw_##combine_op(index + 1, shift_mask, 16, alpha_op); \
tile_8bpp_draw_##combine_op(index + 0, shift, 24, alpha_op) \
#define tile_8bpp_draw_four_base(index, alpha_op, flip_op) \
tile_8bpp_draw_four_##flip_op(index, base, alpha_op) \
// Draw half of a tile in 8bpp mode, for transparent renderer; as an
// optimization the entire thing is checked against zero (in transparent
// capable renders it is more likely for the pixels to be transparent than
// opaque)
#define tile_8bpp_draw_four_transparent(index, alpha_op, flip_op) \
if(current_pixels != 0) \
{ \
tile_8bpp_draw_four_##flip_op(index, transparent, alpha_op); \
} \
#define tile_8bpp_draw_four_copy(index, alpha_op, flip_op) \
if(current_pixels != 0) \
{ \
tile_8bpp_draw_four_##flip_op(index, copy, alpha_op); \
} \
// Helper macro for drawing 8bpp tiles clipped against the edge of the screen
#define partial_tile_8bpp(combine_op, alpha_op) \
for(i = 0; i < partial_tile_run; i++) \
{ \
tile_8bpp_draw_##combine_op(0, mask, 0, alpha_op); \
current_pixels >>= 8; \
advance_dest_ptr_##combine_op(1); \
} \
// Draws 8bpp tiles clipped against the left side of the screen,
// partial_tile_offset indicates how much clipped in it is, partial_tile_run
// indicates how much it should draw.
#define partial_tile_right_noflip_8bpp(combine_op, alpha_op) \
if(partial_tile_offset >= 4) \
{ \
current_pixels = *((u32 *)(tile_ptr + 4)) >> \
((partial_tile_offset - 4) * 8); \
partial_tile_8bpp(combine_op, alpha_op); \
} \
else \
{ \
partial_tile_run -= 4; \
current_pixels = *((u32 *)tile_ptr) >> (partial_tile_offset * 8); \
partial_tile_8bpp(combine_op, alpha_op); \
current_pixels = *((u32 *)(tile_ptr + 4)); \
tile_8bpp_draw_four_##combine_op(0, alpha_op, noflip); \
advance_dest_ptr_##combine_op(4); \
} \
// Draws 8bpp tiles clipped against both the left and right side of the
// screen, IE, runs of less than 8 - partial_tile_offset.
#define partial_tile_mid_noflip_8bpp(combine_op, alpha_op) \
if(partial_tile_offset >= 4) \
{ \
current_pixels = *((u32 *)(tile_ptr + 4)) >> \
((partial_tile_offset - 4) * 8); \
partial_tile_8bpp(combine_op, alpha_op); \
} \
else \
{ \
current_pixels = *((u32 *)tile_ptr) >> (partial_tile_offset * 8); \
if((partial_tile_offset + partial_tile_run) > 4) \
{ \
u32 old_run = partial_tile_run; \
partial_tile_run = 4 - partial_tile_offset; \
partial_tile_8bpp(combine_op, alpha_op); \
partial_tile_run = old_run - partial_tile_run; \
current_pixels = *((u32 *)(tile_ptr + 4)); \
partial_tile_8bpp(combine_op, alpha_op); \
} \
else \
{ \
partial_tile_8bpp(combine_op, alpha_op); \
} \
} \
// Draws 8bpp tiles clipped against the right side of the screen,
// partial_tile_run indicates how much there is to draw.
#define partial_tile_left_noflip_8bpp(combine_op, alpha_op) \
if(partial_tile_run >= 4) \
{ \
current_pixels = *((u32 *)tile_ptr); \
tile_8bpp_draw_four_##combine_op(0, alpha_op, noflip); \
advance_dest_ptr_##combine_op(4); \
tile_ptr += 4; \
partial_tile_run -= 4; \
} \
\
current_pixels = *((u32 *)(tile_ptr)); \
partial_tile_8bpp(combine_op, alpha_op) \
// Draws a non-clipped (complete) 8bpp tile.
#define tile_noflip_8bpp(combine_op, alpha_op) \
current_pixels = *((u32 *)tile_ptr); \
tile_8bpp_draw_four_##combine_op(0, alpha_op, noflip); \
current_pixels = *((u32 *)(tile_ptr + 4)); \
tile_8bpp_draw_four_##combine_op(4, alpha_op, noflip) \
// Like the above versions but draws flipped tiles.
#define partial_tile_flip_8bpp(combine_op, alpha_op) \
for(i = 0; i < partial_tile_run; i++) \
{ \
tile_8bpp_draw_##combine_op(0, shift, 24, alpha_op); \
current_pixels <<= 8; \
advance_dest_ptr_##combine_op(1); \
} \
#define partial_tile_right_flip_8bpp(combine_op, alpha_op) \
if(partial_tile_offset >= 4) \
{ \
current_pixels = *((u32 *)tile_ptr) << ((partial_tile_offset - 4) * 8); \
partial_tile_flip_8bpp(combine_op, alpha_op); \
} \
else \
{ \
partial_tile_run -= 4; \
current_pixels = *((u32 *)(tile_ptr + 4)) << \
((partial_tile_offset - 4) * 8); \
partial_tile_flip_8bpp(combine_op, alpha_op); \
current_pixels = *((u32 *)tile_ptr); \
tile_8bpp_draw_four_##combine_op(0, alpha_op, flip); \
advance_dest_ptr_##combine_op(4); \
} \
#define partial_tile_mid_flip_8bpp(combine_op, alpha_op) \
if(partial_tile_offset >= 4) \
{ \
current_pixels = *((u32 *)tile_ptr) << ((partial_tile_offset - 4) * 8); \
partial_tile_flip_8bpp(combine_op, alpha_op); \
} \
else \
{ \
current_pixels = *((u32 *)(tile_ptr + 4)) << \
((partial_tile_offset - 4) * 8); \
\
if((partial_tile_offset + partial_tile_run) > 4) \
{ \
u32 old_run = partial_tile_run; \
partial_tile_run = 4 - partial_tile_offset; \
partial_tile_flip_8bpp(combine_op, alpha_op); \
partial_tile_run = old_run - partial_tile_run; \
current_pixels = *((u32 *)(tile_ptr)); \
partial_tile_flip_8bpp(combine_op, alpha_op); \
} \
else \
{ \
partial_tile_flip_8bpp(combine_op, alpha_op); \
} \
} \
#define partial_tile_left_flip_8bpp(combine_op, alpha_op) \
if(partial_tile_run >= 4) \
{ \
current_pixels = *((u32 *)(tile_ptr + 4)); \
tile_8bpp_draw_four_##combine_op(0, alpha_op, flip); \
advance_dest_ptr_##combine_op(4); \
tile_ptr -= 4; \
partial_tile_run -= 4; \
} \
\
current_pixels = *((u32 *)(tile_ptr + 4)); \
partial_tile_flip_8bpp(combine_op, alpha_op) \
#define tile_flip_8bpp(combine_op, alpha_op) \
current_pixels = *((u32 *)(tile_ptr + 4)); \
tile_8bpp_draw_four_##combine_op(0, alpha_op, flip); \
current_pixels = *((u32 *)tile_ptr); \
tile_8bpp_draw_four_##combine_op(4, alpha_op, flip) \
// Operations for isolating 4bpp tiles in a 32bit block
#define tile_4bpp_pixel_op_mask(op_param) \
current_pixel = current_pixels & 0x0F \
#define tile_4bpp_pixel_op_shift_mask(shift) \
current_pixel = (current_pixels >> shift) & 0x0F \
#define tile_4bpp_pixel_op_shift(shift) \
current_pixel = current_pixels >> shift \
#define tile_4bpp_pixel_op_none(op_param) \
// Draws a single 4bpp pixel as base, normal renderer; checks to see if the
// pixel is zero because if so the current palette should not be applied.
// These ifs can be replaced with a lookup table, may or may not be superior
// this way, should be benchmarked. The lookup table would be from 0-255
// identity map except for multiples of 16, which would map to 0.
#define tile_4bpp_draw_base_normal(index) \
if(current_pixel) \
{ \
current_pixel |= current_palette; \
tile_expand_base_normal(index); \
} \
else \
{ \
tile_expand_base_normal(index); \
} \
#define tile_4bpp_draw_base_alpha(index) \
if(current_pixel) \
{ \
current_pixel |= current_palette; \
tile_expand_base_alpha(index); \
} \
else \
{ \
tile_expand_base_bg(index); \
} \
#define tile_4bpp_draw_base_color16(index) \
tile_4bpp_draw_base_alpha(index) \
#define tile_4bpp_draw_base_color32(index) \
tile_4bpp_draw_base_alpha(index) \
#define tile_4bpp_draw_base(index, op, op_param, alpha_op) \
tile_4bpp_pixel_op_##op(op_param); \
tile_4bpp_draw_base_##alpha_op(index) \
// Draws a single 4bpp pixel as layered, if not transparent.
#define tile_4bpp_draw_transparent(index, op, op_param, alpha_op) \
tile_4bpp_pixel_op_##op(op_param); \
if(current_pixel) \
{ \
current_pixel |= current_palette; \
tile_expand_transparent_##alpha_op(index); \
} \
#define tile_4bpp_draw_copy(index, op, op_param, alpha_op) \
tile_4bpp_pixel_op_##op(op_param); \
if(current_pixel) \
{ \
current_pixel |= current_palette; \
tile_expand_copy(index); \
} \
// Draws eight background pixels in transparent mode, for alpha or normal
// renderers.
#define tile_4bpp_draw_eight_base_zero(value) \
dest_ptr[0] = value; \
dest_ptr[1] = value; \
dest_ptr[2] = value; \
dest_ptr[3] = value; \
dest_ptr[4] = value; \
dest_ptr[5] = value; \
dest_ptr[6] = value; \
dest_ptr[7] = value \
// Draws eight background pixels for the alpha renderer, basically color zero
// with the background flag high.
#define tile_4bpp_draw_eight_base_zero_alpha() \
tile_4bpp_draw_eight_base_zero(bg_combine) \
#define tile_4bpp_draw_eight_base_zero_color16() \
tile_4bpp_draw_eight_base_zero_alpha() \
#define tile_4bpp_draw_eight_base_zero_color32() \
tile_4bpp_draw_eight_base_zero_alpha() \
// Draws eight background pixels for the normal renderer, just a bunch of
// zeros.
#ifdef RENDER_COLOR16_NORMAL
#define tile_4bpp_draw_eight_base_zero_normal() \
current_pixel = 0; \
tile_4bpp_draw_eight_base_zero(current_pixel) \
#else
#define tile_4bpp_draw_eight_base_zero_normal() \
current_pixel = palette[0]; \
tile_4bpp_draw_eight_base_zero(current_pixel) \
#endif
// Draws eight 4bpp pixels.
#define tile_4bpp_draw_eight_noflip(combine_op, alpha_op) \
tile_4bpp_draw_##combine_op(0, mask, 0, alpha_op); \
tile_4bpp_draw_##combine_op(1, shift_mask, 4, alpha_op); \
tile_4bpp_draw_##combine_op(2, shift_mask, 8, alpha_op); \
tile_4bpp_draw_##combine_op(3, shift_mask, 12, alpha_op); \
tile_4bpp_draw_##combine_op(4, shift_mask, 16, alpha_op); \
tile_4bpp_draw_##combine_op(5, shift_mask, 20, alpha_op); \
tile_4bpp_draw_##combine_op(6, shift_mask, 24, alpha_op); \
tile_4bpp_draw_##combine_op(7, shift, 28, alpha_op) \
// Draws eight 4bpp pixels in reverse order (for hflip).
#define tile_4bpp_draw_eight_flip(combine_op, alpha_op) \
tile_4bpp_draw_##combine_op(7, mask, 0, alpha_op); \
tile_4bpp_draw_##combine_op(6, shift_mask, 4, alpha_op); \
tile_4bpp_draw_##combine_op(5, shift_mask, 8, alpha_op); \
tile_4bpp_draw_##combine_op(4, shift_mask, 12, alpha_op); \
tile_4bpp_draw_##combine_op(3, shift_mask, 16, alpha_op); \
tile_4bpp_draw_##combine_op(2, shift_mask, 20, alpha_op); \
tile_4bpp_draw_##combine_op(1, shift_mask, 24, alpha_op); \
tile_4bpp_draw_##combine_op(0, shift, 28, alpha_op) \
// Draws eight 4bpp pixels in base mode, checks if all are zero, if so draws
// the appropriate background pixels.
#define tile_4bpp_draw_eight_base(alpha_op, flip_op) \
if(current_pixels != 0) \
{ \
tile_4bpp_draw_eight_##flip_op(base, alpha_op); \
} \
else \
{ \
tile_4bpp_draw_eight_base_zero_##alpha_op(); \
} \
// Draws eight 4bpp pixels in transparent (layered) mode, checks if all are
// zero and if so draws nothing.
#define tile_4bpp_draw_eight_transparent(alpha_op, flip_op) \
if(current_pixels != 0) \
{ \
tile_4bpp_draw_eight_##flip_op(transparent, alpha_op); \
} \
#define tile_4bpp_draw_eight_copy(alpha_op, flip_op) \
if(current_pixels != 0) \
{ \
tile_4bpp_draw_eight_##flip_op(copy, alpha_op); \
} \
// Gets the current tile in 4bpp mode, also getting the current palette and
// the pixel block.
#define get_tile_4bpp() \
current_tile = *map_ptr; \
current_palette = (current_tile >> 12) << 4; \
tile_ptr = tile_base + ((current_tile & 0x3FF) * 32); \
// Helper macro for drawing clipped 4bpp tiles.
#define partial_tile_4bpp(combine_op, alpha_op) \
for(i = 0; i < partial_tile_run; i++) \
{ \
tile_4bpp_draw_##combine_op(0, mask, 0, alpha_op); \
current_pixels >>= 4; \
advance_dest_ptr_##combine_op(1); \
} \
// Draws a 4bpp tile clipped against the left edge of the screen.
// partial_tile_offset is how far in it's clipped, partial_tile_run is
// how many to draw.
#define partial_tile_right_noflip_4bpp(combine_op, alpha_op) \
current_pixels = *((u32 *)tile_ptr) >> (partial_tile_offset * 4); \
partial_tile_4bpp(combine_op, alpha_op) \
// Draws a 4bpp tile clipped against both edges of the screen, same as right.
#define partial_tile_mid_noflip_4bpp(combine_op, alpha_op) \
partial_tile_right_noflip_4bpp(combine_op, alpha_op) \
// Draws a 4bpp tile clipped against the right edge of the screen.
// partial_tile_offset is how many to draw.
#define partial_tile_left_noflip_4bpp(combine_op, alpha_op) \
current_pixels = *((u32 *)tile_ptr); \
partial_tile_4bpp(combine_op, alpha_op) \
// Draws a complete 4bpp tile row (not clipped)
#define tile_noflip_4bpp(combine_op, alpha_op) \
current_pixels = *((u32 *)tile_ptr); \
tile_4bpp_draw_eight_##combine_op(alpha_op, noflip) \
// Like the above, but draws flipped tiles.
#define partial_tile_flip_4bpp(combine_op, alpha_op) \
for(i = 0; i < partial_tile_run; i++) \
{ \
tile_4bpp_draw_##combine_op(0, shift, 28, alpha_op); \
current_pixels <<= 4; \
advance_dest_ptr_##combine_op(1); \
} \
#define partial_tile_right_flip_4bpp(combine_op, alpha_op) \
current_pixels = *((u32 *)tile_ptr) << (partial_tile_offset * 4); \
partial_tile_flip_4bpp(combine_op, alpha_op) \
#define partial_tile_mid_flip_4bpp(combine_op, alpha_op) \
partial_tile_right_flip_4bpp(combine_op, alpha_op) \
#define partial_tile_left_flip_4bpp(combine_op, alpha_op) \
current_pixels = *((u32 *)tile_ptr); \
partial_tile_flip_4bpp(combine_op, alpha_op) \
#define tile_flip_4bpp(combine_op, alpha_op) \
current_pixels = *((u32 *)tile_ptr); \
tile_4bpp_draw_eight_##combine_op(alpha_op, flip) \
// Draws a single (partial or complete) tile from the tilemap, flipping
// as necessary.
#define single_tile_map(tile_type, combine_op, color_depth, alpha_op) \
get_tile_##color_depth(); \
if(current_tile & 0x800) \
tile_ptr += vertical_pixel_flip; \
\
if(current_tile & 0x400) \
{ \
tile_type##_flip_##color_depth(combine_op, alpha_op); \
} \
else \
{ \
tile_type##_noflip_##color_depth(combine_op, alpha_op); \
} \
// Draws multiple sequential tiles from the tilemap, hflips and vflips as
// necessary.
#define multiple_tile_map(combine_op, color_depth, alpha_op) \
for(i = 0; i < tile_run; i++) \
{ \
single_tile_map(tile, combine_op, color_depth, alpha_op); \
advance_dest_ptr_##combine_op(8); \
map_ptr++; \
} \
// Draws a partial tile from a tilemap clipped against the left edge of the
// screen.
#define partial_tile_right_map(combine_op, color_depth, alpha_op) \
single_tile_map(partial_tile_right, combine_op, color_depth, alpha_op); \
map_ptr++ \
// Draws a partial tile from a tilemap clipped against both edges of the
// screen.
#define partial_tile_mid_map(combine_op, color_depth, alpha_op) \
single_tile_map(partial_tile_mid, combine_op, color_depth, alpha_op) \
// Draws a partial tile from a tilemap clipped against the right edge of the
// screen.
#define partial_tile_left_map(combine_op, color_depth, alpha_op) \
single_tile_map(partial_tile_left, combine_op, color_depth, alpha_op) \
// Advances a non-flipped 4bpp obj to the next tile.
#define obj_advance_noflip_4bpp() \
tile_ptr += 32 \
// Advances a non-flipped 8bpp obj to the next tile.
#define obj_advance_noflip_8bpp() \
tile_ptr += 64 \
// Advances a flipped 4bpp obj to the next tile.
#define obj_advance_flip_4bpp() \
tile_ptr -= 32 \
// Advances a flipped 8bpp obj to the next tile.
#define obj_advance_flip_8bpp() \
tile_ptr -= 64 \
// Draws multiple sequential tiles from an obj, flip_op determines if it should
// be flipped or not (set to flip or noflip)
#define multiple_tile_obj(combine_op, color_depth, alpha_op, flip_op) \
for(i = 0; i < tile_run; i++) \
{ \
tile_##flip_op##_##color_depth(combine_op, alpha_op); \
obj_advance_##flip_op##_##color_depth(); \
advance_dest_ptr_##combine_op(8); \
} \
// Draws an obj's tile clipped against the left side of the screen
#define partial_tile_right_obj(combine_op, color_depth, alpha_op, flip_op) \
partial_tile_right_##flip_op##_##color_depth(combine_op, alpha_op); \
obj_advance_##flip_op##_##color_depth() \
// Draws an obj's tile clipped against both sides of the screen
#define partial_tile_mid_obj(combine_op, color_depth, alpha_op, flip_op) \
partial_tile_mid_##flip_op##_##color_depth(combine_op, alpha_op) \
// Draws an obj's tile clipped against the right side of the screen
#define partial_tile_left_obj(combine_op, color_depth, alpha_op, flip_op) \
partial_tile_left_##flip_op##_##color_depth(combine_op, alpha_op) \
// Extra variables specific for 8bpp/4bpp tile renderers.
#define tile_extra_variables_8bpp() \
#define tile_extra_variables_4bpp() \
u32 current_palette \
// Byte lengths of complete tiles and tile rows in 4bpp and 8bpp.
#define tile_width_4bpp 4
#define tile_size_4bpp 32
#define tile_width_8bpp 8
#define tile_size_8bpp 64
// Render a single scanline of text tiles
#define tile_render(color_depth, combine_op, alpha_op) \
{ \
u32 vertical_pixel_offset = (vertical_offset % 8) * \
tile_width_##color_depth; \
u32 vertical_pixel_flip = \
((tile_size_##color_depth - tile_width_##color_depth) - \
vertical_pixel_offset) - vertical_pixel_offset; \
tile_extra_variables_##color_depth(); \
u8 *tile_base = vram + (((bg_control >> 2) & 0x03) * (1024 * 16)) + \
vertical_pixel_offset; \
u32 pixel_run = 256 - (horizontal_offset % 256); \
u32 current_tile; \
\
map_base += ((vertical_offset % 256) / 8) * 32; \
partial_tile_offset = (horizontal_offset % 8); \
\
if(pixel_run >= end) \
{ \
if(partial_tile_offset) \
{ \
partial_tile_run = 8 - partial_tile_offset; \
if(end < partial_tile_run) \
{ \
partial_tile_run = end; \
partial_tile_mid_map(combine_op, color_depth, alpha_op); \
return; \
} \
else \
{ \
end -= partial_tile_run; \
partial_tile_right_map(combine_op, color_depth, alpha_op); \
} \
} \
\
tile_run = end / 8; \
multiple_tile_map(combine_op, color_depth, alpha_op); \
\
partial_tile_run = end % 8; \
\
if(partial_tile_run) \
{ \
partial_tile_left_map(combine_op, color_depth, alpha_op); \
} \
} \
else \
{ \
if(partial_tile_offset) \
{ \
partial_tile_run = 8 - partial_tile_offset; \
partial_tile_right_map(combine_op, color_depth, alpha_op); \
} \
\
tile_run = (pixel_run - partial_tile_run) / 8; \
multiple_tile_map(combine_op, color_depth, alpha_op); \
map_ptr = second_ptr; \
end -= pixel_run; \
tile_run = end / 8; \
multiple_tile_map(combine_op, color_depth, alpha_op); \
\
partial_tile_run = end % 8; \
if(partial_tile_run) \
{ \
partial_tile_left_map(combine_op, color_depth, alpha_op); \
} \
} \
} \
#define render_scanline_dest_normal u16
#define render_scanline_dest_alpha u32
#define render_scanline_dest_alpha_obj u32
#define render_scanline_dest_color16 u16
#define render_scanline_dest_color32 u32
#define render_scanline_dest_partial_alpha u32
#define render_scanline_dest_copy_tile u16
#define render_scanline_dest_copy_bitmap u16
// If rendering a scanline that is not a target A then there's no point in
// keeping what's underneath it because it can't blend with it.
#define render_scanline_skip_alpha(bg_type, combine_op) \
if((pixel_combine & 0x00000200) == 0) \
{ \
render_scanline_##bg_type##_##combine_op##_color32(layer, \
start, end, scanline); \
return; \
} \
#ifdef RENDER_COLOR16_NORMAL
#define render_scanline_extra_variables_base_normal(bg_type) \
const u32 pixel_combine = 0 \
#else
#define render_scanline_extra_variables_base_normal(bg_type) \
u16 *palette = palette_ram_converted \
#endif
#define render_scanline_extra_variables_base_alpha(bg_type) \
u32 bg_combine = color_combine_mask(5); \
u32 pixel_combine = color_combine_mask(layer) | (bg_combine << 16); \
render_scanline_skip_alpha(bg_type, base) \
#define render_scanline_extra_variables_base_color() \
u32 bg_combine = color_combine_mask(5); \
u32 pixel_combine = color_combine_mask(layer) \
#define render_scanline_extra_variables_base_color16(bg_type) \
render_scanline_extra_variables_base_color() \
#define render_scanline_extra_variables_base_color32(bg_type) \
render_scanline_extra_variables_base_color() \
#define render_scanline_extra_variables_transparent_normal(bg_type) \
render_scanline_extra_variables_base_normal(bg_type) \
#define render_scanline_extra_variables_transparent_alpha(bg_type) \
u32 pixel_combine = color_combine_mask(layer); \
render_scanline_skip_alpha(bg_type, transparent) \
#define render_scanline_extra_variables_transparent_color() \
u32 pixel_combine = color_combine_mask(layer) \
#define render_scanline_extra_variables_transparent_color16(bg_type) \
render_scanline_extra_variables_transparent_color() \
#define render_scanline_extra_variables_transparent_color32(bg_type) \
render_scanline_extra_variables_transparent_color() \
static const u32 map_widths[] = { 256, 512, 256, 512 };
// Build text scanline rendering functions.
#define render_scanline_text_builder(combine_op, alpha_op) \
static void render_scanline_text_##combine_op##_##alpha_op(u32 layer, \
u32 start, u32 end, void *scanline) \
{ \
render_scanline_extra_variables_##combine_op##_##alpha_op(text); \
u32 bg_control = io_registers[REG_BG0CNT + layer]; \
u32 map_size = (bg_control >> 14) & 0x03; \
u32 map_width = map_widths[map_size]; \
u32 horizontal_offset = \
(io_registers[REG_BG0HOFS + (layer * 2)] + start) % 512; \
u32 vertical_offset = (io_registers[REG_VCOUNT] + \
io_registers[REG_BG0VOFS + (layer * 2)]) % 512; \
u32 current_pixel; \
u32 current_pixels; \
u32 partial_tile_run = 0; \
u32 partial_tile_offset; \
u32 tile_run; \
u32 i; \
render_scanline_dest_##alpha_op *dest_ptr = \
((render_scanline_dest_##alpha_op *)scanline) + start; \
\
u16 *map_base = (u16 *)(vram + ((bg_control >> 8) & 0x1F) * (1024 * 2)); \
u16 *map_ptr, *second_ptr; \
u8 *tile_ptr; \
\
end -= start; \
\
if((map_size & 0x02) && (vertical_offset >= 256)) \
{ \
map_base += ((map_width / 8) * 32) + \
(((vertical_offset - 256) / 8) * 32); \
} \
else \
{ \
map_base += (((vertical_offset % 256) / 8) * 32); \
} \
\
if(map_size & 0x01) \
{ \
if(horizontal_offset >= 256) \
{ \
horizontal_offset -= 256; \
map_ptr = map_base + (32 * 32) + (horizontal_offset / 8); \
second_ptr = map_base; \
} \
else \
{ \
map_ptr = map_base + (horizontal_offset / 8); \
second_ptr = map_base + (32 * 32); \
} \
} \
else \
{ \
horizontal_offset %= 256; \
map_ptr = map_base + (horizontal_offset / 8); \
second_ptr = map_base; \
} \
\
if(bg_control & 0x80) \
{ \
tile_render(8bpp, combine_op, alpha_op); \
} \
else \
{ \
tile_render(4bpp, combine_op, alpha_op); \
} \
} \
render_scanline_text_builder(base, normal);
render_scanline_text_builder(transparent, normal);
render_scanline_text_builder(base, color16);
render_scanline_text_builder(transparent, color16);
render_scanline_text_builder(base, color32);
render_scanline_text_builder(transparent, color32);
render_scanline_text_builder(base, alpha);
render_scanline_text_builder(transparent, alpha);