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→Fragment lighting registers
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These registers (along with _Z) represent the light position (for a positional light) or the light direction vector (for a directional light) of the corresponding light.
These registers (along with GPUREG_LIGHT''i''_Z) represent the light position (for a positional light) or the light direction vector (for a directional light) of the corresponding light.
=== GPUREG_LIGHT''i''_Z ===
=== GPUREG_LIGHT''i''_Z ===
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These registers (along with _XY) represent the light position (for a positional light) or the light direction vector (for a directional light) of the corresponding light.
These registers (along with GPUREG_LIGHT''i''_XY) represent the light position (for a positional light) or the light direction vector (for a directional light) of the corresponding light.
=== GPUREG_LIGHT''i''_SPOTDIR_XY ===
=== GPUREG_LIGHT''i''_SPOTDIR_XY ===
|-
|-
| 0-12
| 0-12
| fixed1.1.11, X coordinate (Usually the input value is negated)
| fixed1.1.11, X coordinate (negated)
|-
|-
| 16-28
| 16-28
| fixed1.1.11, Y coordinate (Usually the input value is negated)
| fixed1.1.11, Y coordinate (negated)
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These registers (along with _Z) represent the spot direction (unitary) vector of the corresponding light.
These registers (along with GPUREG_LIGHT''i''_SPOTDIR_Z) represent the spot direction (unitary) vector of the corresponding light.
=== GPUREG_LIGHT''i''_SPOTDIR_Z ===
=== GPUREG_LIGHT''i''_SPOTDIR_Z ===
|-
|-
| 0-12
| 0-12
| fixed1.1.11, Z coordinate (Usually the input value is negated)
| fixed1.1.11, Z coordinate (negated)
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These registers (along with _XY) represent the spot direction (unitary) vector of the corresponding light.
These registers (along with GPUREG_LIGHT''i''_SPOTDIR_XY) represent the spot direction (unitary) vector of the corresponding light.
=== GPUREG_LIGHT''i''_CONFIG ===
=== GPUREG_LIGHT''i''_CONFIG ===
| unsigned, Use geometric factor 1 (0 = don't use, 1 = use)
| unsigned, Use geometric factor 1 (0 = don't use, 1 = use)
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This register configures a light's properties.
=== GPUREG_LIGHT''i''_ATTENUATION_BIAS ===
=== GPUREG_LIGHT''i''_ATTENUATION_BIAS ===
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These registers contain the distance attenuation bias value of the corresponding light. The attenuation factor is lut_DA(clip(bias + scale*distance, 0.0, 1.0)).
These registers contain the distance attenuation bias value of the corresponding light. The attenuation factor is DA(clip(bias + scale*distance, 0.0, 1.0)).
=== GPUREG_LIGHT''i''_ATTENUATION_SCALE ===
=== GPUREG_LIGHT''i''_ATTENUATION_SCALE ===
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These registers contain the distance attenuation scale value of the corresponding light. The attenuation factor is lut_DA(clip(bias + scale*distance, 0.0, 1.0)).
These registers contain the distance attenuation scale value of the corresponding light. The attenuation factor is DA(clip(bias + scale*distance, 0.0, 1.0)).
=== GPUREG_LIGHTING_AMBIENT ===
=== GPUREG_LIGHTING_AMBIENT ===
| unsigned, Number of active lights - 1
| unsigned, Number of active lights - 1
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This register configures the number of active lights.
=== GPUREG_LIGHTING_CONFIG0 ===
=== GPUREG_LIGHTING_CONFIG0 ===
| 0x1
| 0x1
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This register configures the light environment.
Fresnel selector values:
Fresnel selector values:
| unsigned, Fragment light source 7 distance attenuation disabled (0 = enabled, 1 = disabled)
| unsigned, Fragment light source 7 distance attenuation disabled (0 = enabled, 1 = disabled)
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This register is used to disable various aspects of the light environment.
=== GPUREG_LIGHTING_LUT_INDEX ===
=== GPUREG_LIGHTING_LUT_INDEX ===
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This register controls which LUT and what offset into it the LUT_DATA register writes to.
This register controls which LUT and what offset into it the GPUREG_LIGHTING_LUT_DATA''i'' register writes to.
Lookup table values:
Lookup table values:
| unsigned, Input selector for RR
| unsigned, Input selector for RR
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This register selects the input from LUTs.
Input selector values:
Input selector values:
| unsigned, ID of the 8th enabled light
| unsigned, ID of the 8th enabled light
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This register sets the IDs of enabled light sources.
== Geometry pipeline registers ==
== Geometry pipeline registers ==