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GPU/Internal Registers: Difference between revisions

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| Parameter mask
| Parameter mask
|-
|-
| 20-30
| 20-27
| Number of extra parameters (may be zero)
| Number of extra parameters (may be zero)
|-
| 28-30
| Unused
|-
|-
| 31
| 31
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These registers map components of the corresponding vertex shader output register to specific fixed-function semantics.
These registers map components of the corresponding vertex shader output register to specific fixed-function semantics.
Semantics that have not been mapped to a component of an output register have a value of 1


Semantic values:
Semantic values:
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| unsigned, Minification filter
| unsigned, Minification filter
|-
|-
| 3-10
| 3-6
| 0x60
| Min LOD (usually 0)
|-
| 7-10
| Max LOD (usually 6)
|-
|-
| 11-18
| 11-18
Line 5,037: Line 5,045:
|-
|-
| 0-7
| 0-7
| unsigned, Texture offset
| unsigned, Texture offset (Mipmap level 0 / base level)
|-
| 8-15
| unsigned, mipmap level 1 offset (usually 0x80)
|-
| 16-23
| unsigned, mipmap level 2 offset (usually 0xC0)
|-
|-
| 8-31
| 24-31
| 0xE0C080
| unsigned, mipmap level 3 offset (usually 0xE0)
|}
|}


This register is used to set the procedural texture unit's offset.
This register is used to set the procedural texture unit's offset. Mipmap level 4-7 seems to be hardcoded at offset 0xF0, 0xF8, 0xFC and 0xFE .


=== GPUREG_PROCTEX_LUT ===
=== GPUREG_PROCTEX_LUT ===
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|-
|-
| 12-23
| 12-23
| fixed1.0.11, Difference from next element
| fixed0.0.12 with two's complement ( [0.5,1.0) mapped to [-1.0,0) ), Difference from next element
|}
|}


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|-
|-
| 12-23
| 12-23
| fixed1.0.11, Difference from next element
| fixed0.0.12 with two's complement, Difference from next element
|}
|}


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|-
|-
| 12-23
| 12-23
| fixed1.0.11, Difference from next element
| fixed0.0.12 with two's complement, Difference from next element
|}
|}


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|-
|-
| 0-7
| 0-7
| fixed1.0.7, Red difference between current and next color table elements
| signed, Half of red difference between current and next color table elements
|-
|-
| 8-15
| 8-15
| fixed1.0.7, Green difference between current and next color table elements
| signed, Half of green difference between current and next color table elements
|-
|-
| 16-23
| 16-23
| fixed1.0.7, Blue difference between current and next color table elements
| signed, Half of blue difference between current and next color table elements
|-
|-
| 24-31
| 24-31
| fixed1.0.7, Alpha difference between current and next color table elements
| signed, Half of alpha difference between current and next color table elements
|}
|}


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| Previous
| Previous
|}
|}
Using Previous (15) as a source in the first TEV stage returns the value of source 3. If source 3 has Previous it returns zero. Previous buffer (13) always returns zero.


=== GPUREG_TEXENV''i''_OPERAND ===
=== GPUREG_TEXENV''i''_OPERAND ===
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This register is used to configure the blending function.
This register is used to configure the blending function.


Equation values:
'''Equation values:'''


{| class="wikitable" border="1"
{| class="wikitable" border="1"
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|}
|}


Function values:
Blend equations 5, 6, 7 appear to behave the same as blend equation 0 (Add)
 
'''Function values:'''


{| class="wikitable" border="1"
{| class="wikitable" border="1"
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|-
|-
| 24
| 24
| 0x1
| unsigned, Vertical flip? (0 = enable, 1 = disable)
|}
|}


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| 0-23
| 0-23
| fixed0.16.8, Depth direction attenuation proportion
| fixed0.16.8, Depth direction attenuation proportion
|-
| 24-25
| unsigned, Depth function
|}
|}


This register is used to configure the gas depth direction attenuation proportion.
This register is used to configure the gas depth direction attenuation proportion, as well as the gas depth function.
 
Gas depth function values:
 
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| Never
|-
| 1
| Always
|-
| 2
| Greater than/Greater than or equal
|-
| 3
| Less than/Less than or equal/Equal/Not equal
|}


=== GPUREG_FRAGOP_SHADOW ===
=== GPUREG_FRAGOP_SHADOW ===
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| unsigned, Fresnel FR LUT disabled (0 = enabled, 1 = disabled)
| unsigned, Fresnel FR LUT disabled (0 = enabled, 1 = disabled)
|-
|-
| 20-22
| 20
| unsigned, Term 1 reflection component RB LUT disabled (0 = enabled, 7 = disabled)
| unsigned, Term 1 reflection component RB LUT disabled (0 = enabled, 1 = disabled)
|-
|-
| 21
| 21
| unsigned, Term 1 reflection component RG LUT disabled (0 = enabled, 7 = disabled)
| unsigned, Term 1 reflection component RG LUT disabled (0 = enabled, 1 = disabled)
|-
|-
| 22
| 22
| unsigned, Term 1 reflection component RR LUT disabled (0 = enabled, 7 = disabled)
| unsigned, Term 1 reflection component RR LUT disabled (0 = enabled, 1 = disabled)
|-
|-
| 24
| 24
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This register sets whether to use the geometry shader configuration or reuse the vertex shader configuration for the geometry shader shading unit.
This register sets whether to use the geometry shader configuration or reuse the vertex shader configuration for the geometry shader shading unit.
When disabled and the geometry unit is not in use, as configured by GPUREG_GEOSTAGE_CONFIG, uniforms, outmap mask, program code and swizzle data are propagated to the geometry shader unit.


=== GPUREG_START_DRAW_FUNC0 ===
=== GPUREG_START_DRAW_FUNC0 ===
Retrieved from "https://www.3dbrew.org/wiki/GPU/Internal_Registers"