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devilutionX/Source/render.cpp

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/**
* @file render.cpp
*
* Implementation of functionality for rendering the level tiles.
*/
#include "render.h"
#include <climits>
#include "lighting.h"
#include "options.h"
namespace devilution {
#define NO_OVERDRAW
namespace {
enum {
RT_SQUARE,
RT_TRANSPARENT,
RT_LTRIANGLE,
RT_RTRIANGLE,
RT_LTRAPEZOID,
RT_RTRAPEZOID
};
/** Fully transparent variant of WallMask. */
const DWORD WallMask_FullyTrasparent[TILE_HEIGHT] = {
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000
};
/** Transparent variant of RightMask. */
const DWORD RightMask_Transparent[TILE_HEIGHT] = {
0xC0000000,
0xF0000000,
0xFC000000,
0xFF000000,
0xFFC00000,
0xFFF00000,
0xFFFC0000,
0xFFFF0000,
0xFFFFC000,
0xFFFFF000,
0xFFFFFC00,
0xFFFFFF00,
0xFFFFFFC0,
0xFFFFFFF0,
0xFFFFFFFC,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF
};
/** Transparent variant of LeftMask. */
const DWORD LeftMask_Transparent[TILE_HEIGHT] = {
0x00000003,
0x0000000F,
0x0000003F,
0x000000FF,
0x000003FF,
0x00000FFF,
0x00003FFF,
0x0000FFFF,
0x0003FFFF,
0x000FFFFF,
0x003FFFFF,
0x00FFFFFF,
0x03FFFFFF,
0x0FFFFFFF,
0x3FFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF
};
/** Specifies the draw masks used to render transparency of the right side of tiles. */
const DWORD RightMask[TILE_HEIGHT] = {
0xEAAAAAAA,
0xF5555555,
0xFEAAAAAA,
0xFF555555,
0xFFEAAAAA,
0xFFF55555,
0xFFFEAAAA,
0xFFFF5555,
0xFFFFEAAA,
0xFFFFF555,
0xFFFFFEAA,
0xFFFFFF55,
0xFFFFFFEA,
0xFFFFFFF5,
0xFFFFFFFE,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF
};
/** Specifies the draw masks used to render transparency of the left side of tiles. */
const DWORD LeftMask[TILE_HEIGHT] = {
0xAAAAAAAB,
0x5555555F,
0xAAAAAABF,
0x555555FF,
0xAAAAABFF,
0x55555FFF,
0xAAAABFFF,
0x5555FFFF,
0xAAABFFFF,
0x555FFFFF,
0xAABFFFFF,
0x55FFFFFF,
0xABFFFFFF,
0x5FFFFFFF,
0xBFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF
};
/** Specifies the draw masks used to render transparency of wall tiles. */
const DWORD WallMask[TILE_HEIGHT] = {
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555,
0xAAAAAAAA,
0x55555555
};
/** Fully opaque mask */
const DWORD SolidMask[TILE_HEIGHT] = {
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF,
0xFFFFFFFF
};
/** Used to mask out the left half of the tile diamond and only render additional content */
const DWORD RightFoliageMask[TILE_HEIGHT] = {
0xFFFFFFFF,
0x3FFFFFFF,
0x0FFFFFFF,
0x03FFFFFF,
0x00FFFFFF,
0x003FFFFF,
0x000FFFFF,
0x0003FFFF,
0x0000FFFF,
0x00003FFF,
0x00000FFF,
0x000003FF,
0x000000FF,
0x0000003F,
0x0000000F,
0x00000003,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
};
/** Used to mask out the left half of the tile diamond and only render additional content */
const DWORD LeftFoliageMask[TILE_HEIGHT] = {
0xFFFFFFFF,
0xFFFFFFFC,
0xFFFFFFF0,
0xFFFFFFC0,
0xFFFFFF00,
0xFFFFFC00,
0xFFFFF000,
0xFFFFC000,
0xFFFF0000,
0xFFFC0000,
0xFFF00000,
0xFFC00000,
0xFF000000,
0xFC000000,
0xF0000000,
0xC0000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0x00000000,
};
inline int count_leading_zeros(DWORD mask)
{
// Note: This function assumes that the argument is not zero,
// which means there is at least one bit set.
static_assert(
sizeof(DWORD) == sizeof(uint32_t),
"count_leading_zeros: DWORD must be 32bits");
#if defined(__GNUC__) || defined(__clang__)
return __builtin_clz(mask);
#else
// Count the number of leading zeros using binary search.
int n = 0;
if ((mask & 0xFFFF0000) == 0)
n += 16, mask <<= 16;
if ((mask & 0xFF000000) == 0)
n += 8, mask <<= 8;
if ((mask & 0xF0000000) == 0)
n += 4, mask <<= 4;
if ((mask & 0xC0000000) == 0)
n += 2, mask <<= 2;
if ((mask & 0x80000000) == 0)
n += 1;
return n;
#endif
}
template <typename F>
void foreach_set_bit(DWORD mask, const F &f)
{
int i = 0;
while (mask != 0) {
int z = count_leading_zeros(mask);
i += z, mask <<= z;
for (; mask & 0x80000000; i++, mask <<= 1)
f(i);
}
}
inline void DoRenderLine(BYTE *dst, BYTE *src, size_t n, BYTE *tbl, DWORD mask)
{
if (mask == 0xFFFFFFFF) { // Opaque line
if (light_table_index == lightmax) { // Complete darkness
memset(dst, 0, n);
} else if (light_table_index == 0) { // Fully lit
memcpy(dst, src, n);
} else { // Partially lit
for (size_t i = 0; i < n; i++) {
dst[i] = tbl[src[i]];
}
}
} else {
// The number of iterations is anyway limited by the size of the mask.
// So we can limit it by ANDing the mask with another mask that only keeps
// iterations that are lower than n. We can now avoid testing if i < n
// at every loop iteration.
assert(n != 0 && n <= sizeof(DWORD) * CHAR_BIT);
mask &= DWORD(-1) << ((sizeof(DWORD) * CHAR_BIT) - n);
if (sgOptions.Graphics.bBlendedTransparancy) { // Blended transparancy
if (light_table_index == lightmax) { // Complete darkness
for (size_t i = 0; i < n; i++, mask <<= 1) {
if ((mask & 0x80000000) != 0)
dst[i] = 0;
else
dst[i] = paletteTransparencyLookup[0][dst[i]];
}
} else if (light_table_index == 0) { // Fully lit
for (size_t i = 0; i < n; i++, mask <<= 1) {
if ((mask & 0x80000000) != 0)
dst[i] = src[i];
else
dst[i] = paletteTransparencyLookup[dst[i]][src[i]];
}
} else { // Partially lit
for (size_t i = 0; i < n; i++, mask <<= 1) {
if ((mask & 0x80000000) != 0)
dst[i] = tbl[src[i]];
else
dst[i] = paletteTransparencyLookup[dst[i]][tbl[src[i]]];
}
}
} else { // Stippled transparancy
if (light_table_index == lightmax) { // Complete darkness
foreach_set_bit(mask, [=](int i) { dst[i] = 0; });
} else if (light_table_index == 0) { // Fully lit
foreach_set_bit(mask, [=](int i) { dst[i] = src[i]; });
} else { // Partially lit
foreach_set_bit(mask, [=](int i) { dst[i] = tbl[src[i]]; });
}
}
}
}
#if DVL_HAVE_ATTRIBUTE(always_inline) || (defined(__GNUC__) && !defined(__clang__))
__attribute__((always_inline))
#endif
inline void
RenderLine(BYTE *dst_begin, BYTE *dst_end, BYTE **dst, BYTE **src, int n, BYTE *tbl, DWORD mask)
{
#ifdef NO_OVERDRAW
if (*dst >= dst_begin && *dst <= dst_end)
#endif
DoRenderLine(*dst, *src, n, tbl, mask);
(*src) += n;
(*dst) += n;
}
} // namespace
#if defined(__clang__) || defined(__GNUC__)
__attribute__((no_sanitize("shift-base")))
#endif
void
RenderTile(CelOutputBuffer out, int x, int y)
{
int i, j;
char c, v, tile;
BYTE *src, *tbl;
DWORD m, *pFrameTable;
const DWORD *mask;
// TODO: Get rid of overdraw by rendering edge tiles separately.
out.region.x -= BUFFER_BORDER_LEFT;
out.region.y -= BUFFER_BORDER_TOP;
out.region.w += BUFFER_BORDER_LEFT;
out.region.h += BUFFER_BORDER_TOP;
x += BUFFER_BORDER_LEFT;
y += BUFFER_BORDER_TOP;
pFrameTable = (DWORD *)pDungeonCels;
src = &pDungeonCels[SDL_SwapLE32(pFrameTable[level_cel_block & 0xFFF])];
tile = (level_cel_block & 0x7000) >> 12;
tbl = &pLightTbl[256 * light_table_index];
// The mask defines what parts of the tile is opaque
mask = &SolidMask[TILE_HEIGHT - 1];
if (cel_transparency_active) {
if (arch_draw_type == 0) {
if (sgOptions.Graphics.bBlendedTransparancy) // Use a fully transparent mask
mask = &WallMask_FullyTrasparent[TILE_HEIGHT - 1];
else
mask = &WallMask[TILE_HEIGHT - 1];
}
if (arch_draw_type == 1 && tile != RT_LTRIANGLE) {
c = block_lvid[level_piece_id];
if (c == 1 || c == 3) {
if (sgOptions.Graphics.bBlendedTransparancy) // Use a fully transparent mask
mask = &LeftMask_Transparent[TILE_HEIGHT - 1];
else
mask = &LeftMask[TILE_HEIGHT - 1];
}
}
if (arch_draw_type == 2 && tile != RT_RTRIANGLE) {
c = block_lvid[level_piece_id];
if (c == 2 || c == 3) {
if (sgOptions.Graphics.bBlendedTransparancy) // Use a fully transparent mask
mask = &RightMask_Transparent[TILE_HEIGHT - 1];
else
mask = &RightMask[TILE_HEIGHT - 1];
}
}
} else if (arch_draw_type && cel_foliage_active) {
if (tile != RT_TRANSPARENT) {
return;
}
if (arch_draw_type == 1) {
mask = &LeftFoliageMask[TILE_HEIGHT - 1];
}
if (arch_draw_type == 2) {
mask = &RightFoliageMask[TILE_HEIGHT - 1];
}
}
#ifdef _DEBUG
if ((GetAsyncKeyState(DVL_VK_MENU) & 0x8000) != 0) {
mask = &SolidMask[TILE_HEIGHT - 1];
}
#endif
BYTE *dst_begin = out.at(0, BUFFER_BORDER_TOP);
BYTE *dst_end = out.end();
BYTE *dst = out.at(x, y);
const int dst_pitch = out.pitch();
switch (tile) {
case RT_SQUARE:
for (i = TILE_HEIGHT; i != 0; i--, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
RenderLine(dst_begin, dst_end, &dst, &src, TILE_WIDTH / 2, tbl, *mask);
}
break;
case RT_TRANSPARENT:
for (i = TILE_HEIGHT; i != 0; i--, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
m = *mask;
for (j = TILE_WIDTH / 2; j != 0; j -= v, v == TILE_WIDTH / 2 ? m = 0 : m <<= v) {
v = *src++;
if (v >= 0) {
RenderLine(dst_begin, dst_end, &dst, &src, v, tbl, m);
} else {
v = -v;
dst += v;
}
}
}
break;
case RT_LTRIANGLE:
for (i = TILE_HEIGHT - 2; i >= 0; i -= 2, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
src += i & 2;
dst += i;
RenderLine(dst_begin, dst_end, &dst, &src, TILE_WIDTH / 2 - i, tbl, *mask);
}
for (i = 2; i != TILE_WIDTH / 2; i += 2, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
src += i & 2;
dst += i;
RenderLine(dst_begin, dst_end, &dst, &src, TILE_WIDTH / 2 - i, tbl, *mask);
}
break;
case RT_RTRIANGLE:
for (i = TILE_HEIGHT - 2; i >= 0; i -= 2, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
RenderLine(dst_begin, dst_end, &dst, &src, TILE_WIDTH / 2 - i, tbl, *mask);
src += i & 2;
dst += i;
}
for (i = 2; i != TILE_HEIGHT; i += 2, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
RenderLine(dst_begin, dst_end, &dst, &src, TILE_WIDTH / 2 - i, tbl, *mask);
src += i & 2;
dst += i;
}
break;
case RT_LTRAPEZOID:
for (i = TILE_HEIGHT - 2; i >= 0; i -= 2, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
src += i & 2;
dst += i;
RenderLine(dst_begin, dst_end, &dst, &src, TILE_WIDTH / 2 - i, tbl, *mask);
}
for (i = TILE_HEIGHT / 2; i != 0; i--, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
RenderLine(dst_begin, dst_end, &dst, &src, TILE_WIDTH / 2, tbl, *mask);
}
break;
case RT_RTRAPEZOID:
for (i = TILE_HEIGHT - 2; i >= 0; i -= 2, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
RenderLine(dst_begin, dst_end, &dst, &src, TILE_WIDTH / 2 - i, tbl, *mask);
src += i & 2;
dst += i;
}
for (i = TILE_HEIGHT / 2; i != 0; i--, dst -= dst_pitch + TILE_WIDTH / 2, mask--) {
RenderLine(dst_begin, dst_end, &dst, &src, TILE_WIDTH / 2, tbl, *mask);
}
break;
}
}
namespace {
// A tile is a diamond shape consisting of 2 triangles, upper and lower.
// The tile's bounding box is 64 by 31 px.
//
// Heights of the upper and lower triangles of the tile:
constexpr int UpperHeight = TILE_HEIGHT / 2 - 1;
constexpr int LowerHeight = TILE_HEIGHT / 2;
constexpr int Height = LowerHeight + LowerHeight;
constexpr int XStep = 2;
// Blit with left and vertical clipping.
void BlitBlackTileClipLeftY(BYTE *dst, int dst_pitch, int sx, int skip_lower_bottom, int skip_lower_top, int skip_upper_bottom, int skip_upper_top)
{
// Lower triangle (drawn bottom to top):
for (int i = skip_lower_bottom + 1; i <= LowerHeight - skip_lower_top; ++i, dst -= dst_pitch + XStep) {
const int w = 2 * XStep * i;
const int cur_x = sx + TILE_WIDTH / 2 - XStep * i;
if (cur_x >= 0) {
memset(dst, 0, w);
} else if (-cur_x <= w) {
memset(dst - cur_x, 0, w + cur_x);
}
}
dst += 2 * XStep;
// Upper triangle (drawn bottom to top):
for (int i = skip_upper_bottom, j = UpperHeight - skip_upper_bottom; i < UpperHeight - skip_upper_top; ++i, --j, dst -= dst_pitch - XStep) {
const int w = 2 * XStep * j;
const int cur_x = sx + TILE_WIDTH / 2 - XStep * j;
if (cur_x >= 0) {
memset(dst, 0, w);
} else if (-cur_x <= w) {
memset(dst - cur_x, 0, w + cur_x);
} else {
break;
}
}
}
// Blit with right and vertical clipping.
void BlitBlackTileClipWidthY(BYTE *dst, int dst_pitch, int max_w, int skip_lower_bottom, int skip_lower_top, int skip_upper_bottom, int skip_upper_top)
{
// Lower triangle (drawn bottom to top):
for (int i = skip_lower_bottom + 1; i <= LowerHeight - skip_lower_top; ++i, dst -= dst_pitch + XStep) {
if (max_w > 0)
memset(dst, 0, std::min(2 * XStep * i, max_w));
max_w += 2 * XStep * i;
}
dst += 2 * XStep;
// Upper triangle (drawn bottom to top):
for (int i = skip_upper_bottom, j = UpperHeight - skip_upper_bottom; i < UpperHeight - skip_upper_top; ++i, --j, dst -= dst_pitch - XStep) {
max_w -= 2 * XStep;
if (max_w <= 0)
break;
memset(dst, 0, std::min(2 * XStep * j, max_w));
}
}
// Blit with vertical clipping only.
void BlitBlackTileClipY(BYTE *dst, int dst_pitch, int skip_lower_bottom, int skip_lower_top, int skip_upper_bottom, int skip_upper_top)
{
// Lower triangle (drawn bottom to top):
for (int i = skip_lower_bottom + 1; i <= LowerHeight - skip_lower_top; ++i, dst -= dst_pitch + XStep) {
memset(dst, 0, 2 * XStep * i);
}
dst += 2 * XStep;
// Upper triangle (drawn bottom to top):
for (int i = skip_upper_bottom, j = UpperHeight - skip_upper_bottom; i < UpperHeight - skip_upper_top; ++i, --j, dst -= dst_pitch - XStep) {
memset(dst, 0, 2 * XStep * j);
}
}
// Blit a black tile without clipping (must be fully in bounds).
void BlitBlackTileFull(BYTE *dst, int dst_pitch)
{
// Tile is fully in bounds, can use constant loop boundaries.
// Lower triangle (drawn bottom to top):
for (int i = 1; i <= LowerHeight; ++i, dst -= dst_pitch + XStep) {
memset(dst, 0, 2 * XStep * i);
}
dst += 2 * XStep;
// Upper triangle (drawn bottom to to top):
for (int i = 0, j = UpperHeight; i < UpperHeight; ++i, --j, dst -= dst_pitch - XStep) {
memset(dst, 0, 2 * XStep * j);
}
}
} // namespace
void world_draw_black_tile(CelOutputBuffer out, int sx, int sy)
{
if (sx <= -TILE_WIDTH || sx >= out.region.w || sy < 0 || sy + 1 > out.region.h + Height)
return;
// Initial out position: the bottom corner of the lower triangle.
int out_x = sx + TILE_WIDTH / 2 - XStep;
int out_y = sy;
// How many lines to skip for the lower and upper triangles:
int skip_lower_bottom = 0;
int skip_lower_top = 0;
int skip_upper_bottom = 0;
int skip_upper_top = 0;
if (sy >= out.region.h) {
skip_lower_bottom = sy - out.region.h + 1;
out_y -= skip_lower_bottom;
if (skip_lower_bottom > LowerHeight) {
skip_upper_bottom = skip_lower_bottom - LowerHeight;
skip_lower_bottom = LowerHeight;
}
out_x += XStep * (skip_upper_bottom - skip_lower_bottom);
} else if (sy + 1 < Height) {
skip_upper_top = Height - (sy + 1) - 1;
if (skip_upper_top > UpperHeight) {
skip_lower_top = skip_upper_top - UpperHeight;
skip_upper_top = UpperHeight;
}
}
BYTE *dst = out.at(out_x, out_y);
if (out_x < TILE_WIDTH / 2 - XStep) {
BlitBlackTileClipLeftY(dst, out.pitch(), sx, skip_lower_bottom, skip_lower_top, skip_upper_bottom, skip_upper_top);
} else if (sx > out.region.w - TILE_WIDTH) {
BlitBlackTileClipWidthY(dst, out.pitch(), out.region.w - out_x, skip_lower_bottom, skip_lower_top, skip_upper_bottom, skip_upper_top);
} else if (skip_upper_top != 0 || skip_lower_bottom != 0) {
BlitBlackTileClipY(dst, out.pitch(), skip_lower_bottom, skip_lower_top, skip_upper_bottom, skip_upper_top);
} else {
BlitBlackTileFull(dst, out.pitch());
}
}
} // namespace devilution