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Add attenuated point lights

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This commit is contained in:
Magnus Norddahl 2017-01-02 06:52:50 +01:00
parent c0e91086ce
commit c61e9c7fe2
9 changed files with 80 additions and 14 deletions
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1
src/swrenderer/drawers/r_draw.cpp
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@ -102,6 +102,7 @@ namespace swrenderer
uint8_t *dc_destorg;
int dc_destheight;
int dc_count;
FVector3 dc_normal;
FVector3 dc_viewpos;
FVector3 dc_viewpos_step;
TriLight *dc_lights;

1
src/swrenderer/drawers/r_draw.h
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@ -66,6 +66,7 @@ namespace swrenderer
extern uint8_t *dc_destorg;
extern int dc_destheight;
extern int dc_count;
extern FVector3 dc_normal;
extern FVector3 dc_viewpos;
extern FVector3 dc_viewpos_step;
extern TriLight *dc_lights;

28
src/swrenderer/drawers/r_draw_pal.cpp
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@ -128,12 +128,21 @@ namespace swrenderer
// L = light-pos
// dist = sqrt(dot(L, L))
// attenuation = 1 - MIN(dist * (1/radius), 1)
// distance_attenuation = 1 - MIN(dist * (1/radius), 1)
float Lxy2 = lights[i].x; // L.x*L.x + L.y*L.y
float Lz = lights[i].z - viewpos_z;
float dist2 = Lxy2 + Lz * Lz;
float dist = dist2 * _mm_cvtss_f32(_mm_rsqrt_ss(_mm_load_ss(&dist2)));
uint32_t attenuation = (uint32_t)(256.0f - MIN(dist * lights[i].radius, 256.0f));
float rcp_dist = _mm_cvtss_f32(_mm_rsqrt_ss(_mm_load_ss(&dist2)));
float dist = dist2 * rcp_dist;
float distance_attenuation = (256.0f - MIN(dist * lights[i].radius, 256.0f));
// The simple light type
float simple_attenuation = distance_attenuation;
// The point light type
// diffuse = dot(N,L) * attenuation
float point_attenuation = lights[i].y * rcp_dist * distance_attenuation;
uint32_t attenuation = (uint32_t)(lights[i].y == 0.0f ? simple_attenuation : point_attenuation);
lit_r += (light_color_r * material_r * attenuation) >> 16;
lit_g += (light_color_g * material_g * attenuation) >> 16;
@ -1733,8 +1742,17 @@ namespace swrenderer
float Lyz2 = lights[i].y; // L.y*L.y + L.z*L.z
float Lx = lights[i].x - viewpos_x;
float dist2 = Lyz2 + Lx * Lx;
float dist = dist2 * _mm_cvtss_f32(_mm_rsqrt_ss(_mm_load_ss(&dist2)));
uint32_t attenuation = (uint32_t)(256.0f - MIN(dist * lights[i].radius, 256.0f));
float rcp_dist = _mm_cvtss_f32(_mm_rsqrt_ss(_mm_load_ss(&dist2)));
float dist = dist2 * rcp_dist;
float distance_attenuation = (256.0f - MIN(dist * lights[i].radius, 256.0f));
// The simple light type
float simple_attenuation = distance_attenuation;
// The point light type
// diffuse = dot(N,L) * attenuation
float point_attenuation = lights[i].z * rcp_dist * distance_attenuation;
uint32_t attenuation = (uint32_t)(lights[i].z == 0.0f ? simple_attenuation : point_attenuation);
lit_r += (light_color_r * material_r * attenuation) >> 16;
lit_g += (light_color_g * material_g * attenuation) >> 16;

12
src/swrenderer/line/r_walldraw.cpp
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@ -227,11 +227,13 @@ namespace swrenderer
float lz = (float)lightZ;
// Precalculate the constant part of the dot here so the drawer doesn't have to.
bool is_point_light = (cur_node->lightsource->flags4 & MF4_ATTENUATE) != 0;
float lconstant = lx * lx + ly * ly;
float nlconstant = is_point_light ? lx * dc_normal.X + ly * dc_normal.Y : 0.0f;
// Include light only if it touches this column
float radius = cur_node->lightsource->GetRadius();
if (radius * radius >= lconstant)
if (radius * radius >= lconstant && nlconstant >= 0.0f)
{
uint32_t red = cur_node->lightsource->GetRed();
uint32_t green = cur_node->lightsource->GetGreen();
@ -240,6 +242,7 @@ namespace swrenderer
nextlightindex++;
auto &light = dc_lights[dc_num_lights++];
light.x = lconstant;
light.y = nlconstant;
light.z = lz;
light.radius = 256.0f / cur_node->lightsource->GetRadius();
light.color = (red << 16) | (green << 8) | blue;
@ -365,6 +368,13 @@ namespace swrenderer
else
R_SetColorMapLight(basecolormap, 0, 0);
float dx = WallC.tright.X - WallC.tleft.X;
float dy = WallC.tright.Y - WallC.tleft.Y;
float length = sqrt(dx * dx + dy * dy);
dc_normal.X = dy / length;
dc_normal.Y = -dx / length;
dc_normal.Z = 0.0f;
float light = rw_light;
double xmagnitude = 1.0;

12
src/swrenderer/plane/r_flatplane.cpp
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@ -256,7 +256,12 @@ namespace swrenderer
static TriLight lightbuffer[64 * 1024];
static int nextlightindex = 0;
// Setup lights for column
// Plane normal
dc_normal.X = 0.0f;
dc_normal.Y = 0.0f;
dc_normal.Z = (y >= CenterY) ? 1.0f : -1.0f;
// Setup lights for row
dc_num_lights = 0;
dc_lights = lightbuffer + nextlightindex;
visplane_light *cur_node = ds_light_list;
@ -271,11 +276,13 @@ namespace swrenderer
float lz = (float)lightZ - dc_viewpos.Z;
// Precalculate the constant part of the dot here so the drawer doesn't have to.
bool is_point_light = (cur_node->lightsource->flags4 & MF4_ATTENUATE) != 0;
float lconstant = ly * ly + lz * lz;
float nlconstant = is_point_light ? lz * dc_normal.Z : 0.0f;
// Include light only if it touches this row
float radius = cur_node->lightsource->GetRadius();
if (radius * radius >= lconstant)
if (radius * radius >= lconstant && nlconstant >= 0.0f)
{
uint32_t red = cur_node->lightsource->GetRed();
uint32_t green = cur_node->lightsource->GetGreen();
@ -285,6 +292,7 @@ namespace swrenderer
auto &light = dc_lights[dc_num_lights++];
light.x = lx;
light.y = lconstant;
light.z = nlconstant;
light.radius = 256.0f / radius;
light.color = (red << 16) | (green << 8) | blue;
}

17
tools/drawergen/fixedfunction/drawspancodegen.cpp
View file

@ -248,7 +248,7 @@ SSAVec4i DrawSpanCodegen::Shade(SSAVec4i fg, bool isSimpleShade)
SSAVec4i light_color = SSAUBytePtr(SSAValue(dynlights[light_index][0]).v).load_vec4ub(true);
SSAFloat light_x = dynlights[light_index][1].load(true);
SSAFloat light_y = dynlights[light_index][2].load(true);
//SSAFloat light_z = dynlights[light_index][3].load(true);
SSAFloat light_z = dynlights[light_index][3].load(true);
SSAFloat light_rcp_radius = dynlights[light_index][4].load(true);
// L = light-pos
@ -256,8 +256,19 @@ SSAVec4i DrawSpanCodegen::Shade(SSAVec4i fg, bool isSimpleShade)
// attenuation = 1 - MIN(dist * (1/radius), 1)
SSAFloat Lyz2 = light_y; // L.y*L.y + L.z*L.z
SSAFloat Lx = light_x - viewpos_x;
SSAFloat dist = SSAFloat::fastsqrt(Lyz2 + Lx * Lx);
SSAInt attenuation = SSAInt(SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f)), true);
SSAFloat dist2 = Lyz2 + Lx * Lx;
SSAFloat rcp_dist = SSAFloat::rsqrt(dist2);
SSAFloat dist = dist2 * rcp_dist;
SSAFloat distance_attenuation = SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f));
// The simple light type
SSAFloat simple_attenuation = distance_attenuation;
// The point light type
// diffuse = dot(N,L) * attenuation
SSAFloat point_attenuation = light_z * rcp_dist * distance_attenuation;
SSAInt attenuation = SSAInt((light_z == SSAFloat(0.0f)).select(simple_attenuation, point_attenuation), true);
SSAVec4i contribution = (light_color * fg * attenuation) >> 16;
stack_lit_color.store(lit_color + contribution);

17
tools/drawergen/fixedfunction/drawwallcodegen.cpp
View file

@ -179,7 +179,7 @@ SSAVec4i DrawWallCodegen::Shade(SSAVec4i fg, bool isSimpleShade)
{
SSAVec4i light_color = SSAUBytePtr(SSAValue(dynlights[light_index][0]).v).load_vec4ub(true);
SSAFloat light_x = dynlights[light_index][1].load(true);
//SSAFloat light_y = dynlights[light_index][2].load(true);
SSAFloat light_y = dynlights[light_index][2].load(true);
SSAFloat light_z = dynlights[light_index][3].load(true);
SSAFloat light_rcp_radius = dynlights[light_index][4].load(true);
@ -188,8 +188,19 @@ SSAVec4i DrawWallCodegen::Shade(SSAVec4i fg, bool isSimpleShade)
// attenuation = 1 - MIN(dist * (1/radius), 1)
SSAFloat Lxy2 = light_x; // L.x*L.x + L.y*L.y
SSAFloat Lz = light_z - z;
SSAFloat dist = SSAFloat::fastsqrt(Lxy2 + Lz * Lz);
SSAInt attenuation = SSAInt(SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f)), true);
SSAFloat dist2 = Lxy2 + Lz * Lz;
SSAFloat rcp_dist = SSAFloat::rsqrt(dist2);
SSAFloat dist = dist2 * rcp_dist;
SSAFloat distance_attenuation = SSAFloat(256.0f) - SSAFloat::MIN(dist * light_rcp_radius, SSAFloat(256.0f));
// The simple light type
SSAFloat simple_attenuation = distance_attenuation;
// The point light type
// diffuse = dot(N,L) * attenuation
SSAFloat point_attenuation = light_y * rcp_dist * distance_attenuation;
SSAInt attenuation = SSAInt((light_y == SSAFloat(0.0f)).select(simple_attenuation, point_attenuation), true);
SSAVec4i contribution = (light_color * fg * attenuation) >> 16;
stack_lit_color.store(lit_color + contribution);

5
tools/drawergen/ssa/ssa_bool.cpp
View file

@ -58,6 +58,11 @@ SSAInt SSABool::select(SSAInt a, SSAInt b)
return SSAValue::from_llvm(SSAScope::builder().CreateSelect(v, a.v, b.v, SSAScope::hint()));
}
SSAFloat SSABool::select(SSAFloat a, SSAFloat b)
{
return SSAValue::from_llvm(SSAScope::builder().CreateSelect(v, a.v, b.v, SSAScope::hint()));
}
SSAUByte SSABool::select(SSAUByte a, SSAUByte b)
{
return SSAValue::from_llvm(SSAScope::builder().CreateSelect(v, a.v, b.v, SSAScope::hint()));

1
tools/drawergen/ssa/ssa_bool.h
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@ -42,6 +42,7 @@ public:
SSAInt zext_int();
SSAInt select(SSAInt a, SSAInt b);
SSAFloat select(SSAFloat a, SSAFloat b);
SSAUByte select(SSAUByte a, SSAUByte b);
SSAVec4i select(SSAVec4i a, SSAVec4i b);