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GPU/Internal Registers: Difference between revisions

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! Description
! Description
|-
|-
| 0-1
| 0
| Enabled (0 = disabled, 1 = enabled)
| Enabled (0 = disabled, 1 = enabled)
|}
|}
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|}
|}


Reference tables:
Reference table values:


{| class="wikitable" border="1"
{| class="wikitable" border="1"
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| Color difference table
| Color difference table
|}
|}
=== GPUREG_PROCTEX_LUT_DATA''i'' ===
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-31
| LUT data
|}
These registers behave as a FIFO queue. Each write to these registers writes the provided value to the table selected with GPUREG_PROCTEX_LUT, starting at the selected index.


==== Noise Table ====
==== Noise Table ====
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|}
|}


=== GPUREG_PROCTEX_LUT_DATA''i'' ===
=== GPUREG_TEXENV''i''_SOURCE ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-3
| RGB source 0
|-
| 4-7
| RGB source 1
|-
| 8-11
| RGB source 2
|-
| 16-19
| Alpha source 0
|-
| 20-23
| Alpha source 1
|-
| 24-27
| Alpha source 2
|}
 
Source values:
 
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| Primary color
|-
| 1
| Fragment primary color
|-
| 2
| Fragment secondary color
|-
| 3
| Texture 0
|-
| 4
| Texture 1
|-
| 5
| Texture 2
|-
| 6
| Texture 3
|-
| 13
| Previous buffer
|-
| 14
| Constant (from GPUREG_TEXENV''i''_COLOR)
|-
| 15
| Previous
|}
 
=== GPUREG_TEXENV''i''_OPERAND ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-3
| RGB operand 0
|-
| 4-7
| RGB operand 1
|-
| 8-11
| RGB operand 2
|-
| 12-14
| Alpha operand 0
|-
| 16-18
| Alpha operand 1
|-
| 20-22
| Alpha operand 2
|}
 
RGB operand values:
 
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| Source color
|-
| 1
| One minus source color
|-
| 2
| Source alpha
|-
| 3
| One minus source alpha
|-
| 4
| Source red
|-
| 5
| One minus source red
|-
| 8
| Source green
|-
| 9
| One minus source green
|-
| 12
| Source blue
|-
| 13
| One minus source blue
|}
 
Alpha operand values:
 
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| Source alpha
|-
| 1
| One minus source alpha
|-
| 2
| Source red
|-
| 3
| One minus source red
|-
| 4
| Source green
|-
| 5
| One minus source green
|-
| 6
| Source blue
|-
| 7
| One minus source blue
|}
 
=== GPUREG_TEXENV''i''_COMBINER ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-3
| RGB combine
|-
| 16-19
| Alpha combine
|}
 
Combine values:
 
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| Replace
|-
| 1
| Modulate
|-
| 2
| Add
|-
| 3
| Add signed
|-
| 4
| Interpolate
|-
| 5
| Subtract
|-
| 6
| Dot3 RGB
|-
| 7
| Dot3 RGBA
|-
| 8
| Multiply then add
|-
| 9
| Add then multiply
|}
 
=== GPUREG_TEXENV''i''_COLOR ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-7
| Red
|-
| 8-15
| Green
|-
| 16-23
| Blue
|-
| 24-31
| Alpha
|}
 
=== GPUREG_TEXENV''i''_SCALE ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-1
| RGB scale
|-
| 16-17
| Alpha scale
|}
 
Scale values:
 
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| 1x
|-
| 1
| 2x
|-
| 2
| 4x
|}
 
=== GPUREG_TEXENV_UPDATE_BUFFER ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-2
| Fog mode
|-
| 3
| Shading density source
|-
| 8
| TexEnv 1 RGB buffer input
|-
| 9
| TexEnv 2 RGB buffer input
|-
| 10
| TexEnv 3 RGB buffer input
|-
| 11
| TexEnv 4 RGB buffer input
|-
| 12
| TexEnv 1 alpha buffer input
|-
| 13
| TexEnv 2 alpha buffer input
|-
| 14
| TexEnv 3 alpha buffer input
|-
| 15
| TexEnv 4 alpha buffer input
|-
| 16
| Z flip (0 = don't flip, 1 = flip)
|}
 
This register is shared between the gas/fog mode configuration and TexEnv buffer inputs. TexEnv buffer inputs are typically written with a mask of 0x2, and the gas/fog mode configuration is typically written with a mask of 0x5.
 
Fog mode values:
 
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| Disabled
|-
| 5
| Fog
|-
| 7
| Gas
|}
 
Shading density source values:
 
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| Plain density
|-
| 1
| Depth density
|}
 
Buffer input values:
 
{| class="wikitable" border="1"
! Value
! Description
|-
| 0
| Previous buffer
|-
| 1
| Previous
|}
 
=== GPUREG_FOG_COLOR ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-7
| Red
|-
| 8-15
| Green
|-
| 16-23
| Blue
|}
 
=== GPUREG_GAS_ATTENUATION ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-15
| float16, Gas density attenuation
|}
 
=== GPUREG_GAS_ACCMAX ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-15
| float16, Gas maximum density accumulation
|}
 
=== GPUREG_FOG_LUT_INDEX ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-31
| Index
|}
 
=== GPUREG_FOG_LUT_DATA''i'' ===


{| class="wikitable" border="1"
{| class="wikitable" border="1"
Line 4,919: Line 5,314:
|}
|}


These registers behave as a FIFO queue. Each write to these registers writes the provided value to the table selected with GPUREG_PROCTEX_LUT, sequentially.
These registers behave as a FIFO queue. Each write to these registers writes the provided value to the fog look-up table, starting at the index selected with GPUREG_FOG_LUT_INDEX.
 
==== Fog Look-Up Table ====
 
128 elements:
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-12
| fixed13 (11 fractional bits), Difference from next element
|-
| 13-23
| unsigned fixed11, Value
|}
 
=== GPUREG_TEXENV_BUFFER_COLOR ===
 
{| class="wikitable" border="1"
! Bits
! Description
|-
| 0-7
| Red
|-
| 8-15
| Green
|-
| 16-23
| Blue
|-
| 24-31
| Alpha
|}


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