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Merge pull request #2727 from wwylele/spot-light 

Fragment lighting: implement spot light
This commit is contained in:
Sebastian Valle 2017-06-11 18:23:47 +00:00 committed by GitHub
parent 9a8a90b52b 10906dceec
commit 39c7c1f580
5 changed files with 128 additions and 28 deletions
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63
src/video_core/regs_lighting.h
View File

@ -26,6 +26,16 @@ struct LightingRegs {
DistanceAttenuation = 16,
};
static LightingSampler SpotlightAttenuationSampler(unsigned index) {
return static_cast<LightingSampler>(
static_cast<unsigned>(LightingSampler::SpotlightAttenuation) + index);
}
static LightingSampler DistanceAttenuationSampler(unsigned index) {
return static_cast<LightingSampler>(
static_cast<unsigned>(LightingSampler::DistanceAttenuation) + index);
}
/**
* Pica fragment lighting supports using different LUTs for each lighting component: Reflectance
* R, G, and B channels, distribution function for specular components 0 and 1, fresnel factor,
@ -73,6 +83,8 @@ struct LightingRegs {
VH = 1, // Cosine of the angle between the view and half-angle vectors
NV = 2, // Cosine of the angle between the normal and the view vector
LN = 3, // Cosine of the angle between the light and the normal vectors
SP = 4, // Cosine of the angle between the light and the inverse spotlight vectors
CP = 5, // TODO: document and implement
};
enum class LightingBumpMode : u32 {
@ -104,6 +116,9 @@ struct LightingRegs {
return (config != LightingConfig::Config0) && (config != LightingConfig::Config1) &&
(config != LightingConfig::Config5);
case LightingSampler::SpotlightAttenuation:
return (config != LightingConfig::Config2) && (config != LightingConfig::Config3);
case LightingSampler::Fresnel:
return (config != LightingConfig::Config0) && (config != LightingConfig::Config2) &&
(config != LightingConfig::Config4);
@ -116,11 +131,10 @@ struct LightingRegs {
return (config == LightingConfig::Config4) || (config == LightingConfig::Config5) ||
(config == LightingConfig::Config7);
default:
UNREACHABLE_MSG("Regs::IsLightingSamplerSupported: Reached "
"unreachable section, sampler should be one "
"of Distribution0, Distribution1, Fresnel, "
"ReflectRed, ReflectGreen or ReflectBlue, instead "
"got %i",
UNREACHABLE_MSG("Regs::IsLightingSamplerSupported: Reached unreachable section, "
"sampler should be one of Distribution0, Distribution1, "
"SpotlightAttenuation, Fresnel, ReflectRed, ReflectGreen or "
"ReflectBlue, instead got %i",
static_cast<int>(config));
}
}
@ -140,7 +154,16 @@ struct LightingRegs {
BitField<0, 16, u32> z;
};
INSERT_PADDING_WORDS(0x3);
// inverse spotlight direction vector, encoded as fixed1.1.11
union {
BitField<0, 13, s32> spot_x;
BitField<16, 13, s32> spot_y;
};
union {
BitField<0, 13, s32> spot_z;
};
INSERT_PADDING_WORDS(0x1);
union {
BitField<0, 1, u32> directional;
@ -169,8 +192,16 @@ struct LightingRegs {
} config0;
union {
u32 raw;
// Each bit specifies whether spot light attenuation should be applied for the corresponding
// light.
BitField<8, 8, u32> disable_spot_atten;
BitField<16, 1, u32> disable_lut_d0;
BitField<17, 1, u32> disable_lut_d1;
// Note: by intuition, BitField<18, 1, u32> should be disable_lut_sp, but it is actually a
// dummy bit which is always set as 1.
BitField<19, 1, u32> disable_lut_fr;
BitField<20, 1, u32> disable_lut_rr;
BitField<21, 1, u32> disable_lut_rg;
@ -178,23 +209,15 @@ struct LightingRegs {
// Each bit specifies whether distance attenuation should be applied for the corresponding
// light.
BitField<24, 1, u32> disable_dist_atten_light_0;
BitField<25, 1, u32> disable_dist_atten_light_1;
BitField<26, 1, u32> disable_dist_atten_light_2;
BitField<27, 1, u32> disable_dist_atten_light_3;
BitField<28, 1, u32> disable_dist_atten_light_4;
BitField<29, 1, u32> disable_dist_atten_light_5;
BitField<30, 1, u32> disable_dist_atten_light_6;
BitField<31, 1, u32> disable_dist_atten_light_7;
BitField<24, 8, u32> disable_dist_atten;
} config1;
bool IsDistAttenDisabled(unsigned index) const {
const unsigned disable[] = {
config1.disable_dist_atten_light_0, config1.disable_dist_atten_light_1,
config1.disable_dist_atten_light_2, config1.disable_dist_atten_light_3,
config1.disable_dist_atten_light_4, config1.disable_dist_atten_light_5,
config1.disable_dist_atten_light_6, config1.disable_dist_atten_light_7};
return disable[index] != 0;
return (config1.disable_dist_atten & (1 << index)) != 0;
}
bool IsSpotAttenDisabled(unsigned index) const {
return (config1.disable_spot_atten & (1 << index)) != 0;
}
union {

45
src/video_core/renderer_opengl/gl_rasterizer.cpp
View File

@ -735,6 +735,40 @@ void RasterizerOpenGL::NotifyPicaRegisterChanged(u32 id) {
SyncLightPosition(7);
break;
// Fragment spot lighting direction
case PICA_REG_INDEX_WORKAROUND(lighting.light[0].spot_x, 0x146 + 0 * 0x10):
case PICA_REG_INDEX_WORKAROUND(lighting.light[0].spot_z, 0x147 + 0 * 0x10):
SyncLightSpotDirection(0);
break;
case PICA_REG_INDEX_WORKAROUND(lighting.light[1].spot_x, 0x146 + 1 * 0x10):
case PICA_REG_INDEX_WORKAROUND(lighting.light[1].spot_z, 0x147 + 1 * 0x10):
SyncLightSpotDirection(1);
break;
case PICA_REG_INDEX_WORKAROUND(lighting.light[2].spot_x, 0x146 + 2 * 0x10):
case PICA_REG_INDEX_WORKAROUND(lighting.light[2].spot_z, 0x147 + 2 * 0x10):
SyncLightSpotDirection(2);
break;
case PICA_REG_INDEX_WORKAROUND(lighting.light[3].spot_x, 0x146 + 3 * 0x10):
case PICA_REG_INDEX_WORKAROUND(lighting.light[3].spot_z, 0x147 + 3 * 0x10):
SyncLightSpotDirection(3);
break;
case PICA_REG_INDEX_WORKAROUND(lighting.light[4].spot_x, 0x146 + 4 * 0x10):
case PICA_REG_INDEX_WORKAROUND(lighting.light[4].spot_z, 0x147 + 4 * 0x10):
SyncLightSpotDirection(4);
break;
case PICA_REG_INDEX_WORKAROUND(lighting.light[5].spot_x, 0x146 + 5 * 0x10):
case PICA_REG_INDEX_WORKAROUND(lighting.light[5].spot_z, 0x147 + 5 * 0x10):
SyncLightSpotDirection(5);
break;
case PICA_REG_INDEX_WORKAROUND(lighting.light[6].spot_x, 0x146 + 6 * 0x10):
case PICA_REG_INDEX_WORKAROUND(lighting.light[6].spot_z, 0x147 + 6 * 0x10):
SyncLightSpotDirection(6);
break;
case PICA_REG_INDEX_WORKAROUND(lighting.light[7].spot_x, 0x146 + 7 * 0x10):
case PICA_REG_INDEX_WORKAROUND(lighting.light[7].spot_z, 0x147 + 7 * 0x10):
SyncLightSpotDirection(7);
break;
// Fragment lighting light source config
case PICA_REG_INDEX_WORKAROUND(lighting.light[0].config, 0x149 + 0 * 0x10):
case PICA_REG_INDEX_WORKAROUND(lighting.light[1].config, 0x149 + 1 * 0x10):
@ -1595,6 +1629,17 @@ void RasterizerOpenGL::SyncLightPosition(int light_index) {
}
}
void RasterizerOpenGL::SyncLightSpotDirection(int light_index) {
const auto& light = Pica::g_state.regs.lighting.light[light_index];
GLvec3 spot_direction = {light.spot_x / 2047.0f, light.spot_y / 2047.0f,
light.spot_z / 2047.0f};
if (spot_direction != uniform_block_data.data.light_src[light_index].spot_direction) {
uniform_block_data.data.light_src[light_index].spot_direction = spot_direction;
uniform_block_data.dirty = true;
}
}
void RasterizerOpenGL::SyncLightDistanceAttenuationBias(int light_index) {
GLfloat dist_atten_bias =
Pica::float20::FromRaw(Pica::g_state.regs.lighting.light[light_index].dist_atten_bias)

6
src/video_core/renderer_opengl/gl_rasterizer.h
View File

@ -125,6 +125,7 @@ private:
alignas(16) GLvec3 diffuse;
alignas(16) GLvec3 ambient;
alignas(16) GLvec3 position;
alignas(16) GLvec3 spot_direction; // negated
GLfloat dist_atten_bias;
GLfloat dist_atten_scale;
};
@ -153,7 +154,7 @@ private:
};
static_assert(
sizeof(UniformData) == 0x3E0,
sizeof(UniformData) == 0x460,
"The size of the UniformData structure has changed, update the structure in the shader");
static_assert(sizeof(UniformData) < 16384,
"UniformData structure must be less than 16kb as per the OpenGL spec");
@ -241,6 +242,9 @@ private:
/// Syncs the specified light's position to match the PICA register
void SyncLightPosition(int light_index);
/// Syncs the specified spot light direcition to match the PICA register
void SyncLightSpotDirection(int light_index);
/// Syncs the specified light's distance attenuation bias to match the PICA register
void SyncLightDistanceAttenuationBias(int light_index);

39
src/video_core/renderer_opengl/gl_shader_gen.cpp
View File

@ -75,6 +75,8 @@ PicaShaderConfig PicaShaderConfig::BuildFromRegs(const Pica::Regs& regs) {
state.lighting.light[light_index].two_sided_diffuse = light.config.two_sided_diffuse != 0;
state.lighting.light[light_index].dist_atten_enable =
!regs.lighting.IsDistAttenDisabled(num);
state.lighting.light[light_index].spot_atten_enable =
!regs.lighting.IsSpotAttenDisabled(num);
}
state.lighting.lut_d0.enable = regs.lighting.config1.disable_lut_d0 == 0;
@ -87,6 +89,12 @@ PicaShaderConfig PicaShaderConfig::BuildFromRegs(const Pica::Regs& regs) {
state.lighting.lut_d1.type = regs.lighting.lut_input.d1.Value();
state.lighting.lut_d1.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.d1);
// this is a dummy field due to lack of the corresponding register
state.lighting.lut_sp.enable = true;
state.lighting.lut_sp.abs_input = regs.lighting.abs_lut_input.disable_sp == 0;
state.lighting.lut_sp.type = regs.lighting.lut_input.sp.Value();
state.lighting.lut_sp.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.sp);
state.lighting.lut_fr.enable = regs.lighting.config1.disable_lut_fr == 0;
state.lighting.lut_fr.abs_input = regs.lighting.abs_lut_input.disable_fr == 0;
state.lighting.lut_fr.type = regs.lighting.lut_input.fr.Value();
@ -509,7 +517,8 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
out += "vec4 diffuse_sum = vec4(0.0, 0.0, 0.0, 1.0);\n"
"vec4 specular_sum = vec4(0.0, 0.0, 0.0, 1.0);\n"
"vec3 light_vector = vec3(0.0);\n"
"vec3 refl_value = vec3(0.0);\n";
"vec3 refl_value = vec3(0.0);\n"
"vec3 spot_dir = vec3(0.0);\n;";
// Compute fragment normals
if (lighting.bump_mode == LightingRegs::LightingBumpMode::NormalMap) {
@ -560,6 +569,10 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
index = std::string("dot(light_vector, normal)");
break;
case LightingRegs::LightingLutInput::SP:
index = std::string("dot(light_vector, spot_dir)");
break;
default:
LOG_CRITICAL(HW_GPU, "Unknown lighting LUT input %d\n", (int)input);
UNIMPLEMENTED();
@ -596,21 +609,34 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
else
out += "light_vector = normalize(" + light_src + ".position + view);\n";
out += "spot_dir = " + light_src + ".spot_direction;\n";
// Compute dot product of light_vector and normal, adjust if lighting is one-sided or
// two-sided
std::string dot_product = light_config.two_sided_diffuse
? "abs(dot(light_vector, normal))"
: "max(dot(light_vector, normal), 0.0)";
// If enabled, compute spot light attenuation value
std::string spot_atten = "1.0";
if (light_config.spot_atten_enable &&
LightingRegs::IsLightingSamplerSupported(
lighting.config, LightingRegs::LightingSampler::SpotlightAttenuation)) {
std::string index =
GetLutIndex(light_config.num, lighting.lut_sp.type, lighting.lut_sp.abs_input);
auto sampler = LightingRegs::SpotlightAttenuationSampler(light_config.num);
spot_atten = "(" + std::to_string(lighting.lut_sp.scale) + " * " +
GetLutValue(sampler, index) + ")";
}
// If enabled, compute distance attenuation value
std::string dist_atten = "1.0";
if (light_config.dist_atten_enable) {
std::string index = "(" + light_src + ".dist_atten_scale * length(-view - " +
light_src + ".position) + " + light_src + ".dist_atten_bias)";
index = "(OFFSET_256 + SCALE_256 * clamp(" + index + ", 0.0, 1.0))";
const unsigned lut_num =
((unsigned)LightingRegs::LightingSampler::DistanceAttenuation + light_config.num);
dist_atten = GetLutValue((LightingRegs::LightingSampler)lut_num, index);
auto sampler = LightingRegs::DistanceAttenuationSampler(light_config.num);
dist_atten = GetLutValue(sampler, index);
}
// If enabled, clamp specular component if lighting result is negative
@ -711,11 +737,11 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
// Compute primary fragment color (diffuse lighting) function
out += "diffuse_sum.rgb += ((" + light_src + ".diffuse * " + dot_product + ") + " +
light_src + ".ambient) * " + dist_atten + ";\n";
light_src + ".ambient) * " + dist_atten + " * " + spot_atten + ";\n";
// Compute secondary fragment color (specular lighting) function
out += "specular_sum.rgb += (" + specular_0 + " + " + specular_1 + ") * " +
clamp_highlights + " * " + dist_atten + ";\n";
clamp_highlights + " * " + dist_atten + " * " + spot_atten + ";\n";
}
// Sum final lighting result
@ -967,6 +993,7 @@ struct LightSrc {
vec3 diffuse;
vec3 ambient;
vec3 position;
vec3 spot_direction;
float dist_atten_bias;
float dist_atten_scale;
};

3
src/video_core/renderer_opengl/gl_shader_gen.h
View File

@ -93,6 +93,7 @@ union PicaShaderConfig {
bool directional;
bool two_sided_diffuse;
bool dist_atten_enable;
bool spot_atten_enable;
} light[8];
bool enable;
@ -110,7 +111,7 @@ union PicaShaderConfig {
bool abs_input;
Pica::LightingRegs::LightingLutInput type;
float scale;
} lut_d0, lut_d1, lut_fr, lut_rr, lut_rg, lut_rb;
} lut_d0, lut_d1, lut_sp, lut_fr, lut_rr, lut_rg, lut_rb;
} lighting;
struct {