|
|
| Line 1: |
Line 1: |
| This page describes the [[GPU_Commands|GPU commands]] used for textures. | | This page is obsolete, see [[GPU/Internal_Registers|here]] for GPU register information, including that of textures. |
| | |
| == General information ==
| |
| Individual texels in a texture are laid out in memory as a [http://en.wikipedia.org/wiki/Z-order_curve Z-order curve]. Mipmap data is stored directly following the main texture data.
| |
| | |
| == Texture unit setup: Register 0x80 ==
| |
| Register 0x80 is used to enable individual texture units.
| |
| | |
| {| class="wikitable" border="1"
| |
| ! Bit
| |
| ! Description
| |
| |-
| |
| | 0
| |
| | Enable texture unit 0.
| |
| |-
| |
| | 1
| |
| | Enable texture unit 1.
| |
| |-
| |
| | 2
| |
| | Enable texture unit 2.
| |
| |}
| |
| | |
| == Configuration of texture unit 0 ==
| |
| {| class="wikitable" border="1"
| |
| ! Register ID
| |
| ! Description
| |
| |-
| |
| | 0x0081
| |
| | Border color (unverified)
| |
| |-
| |
| | 0x0082
| |
| | Bits 16-31 are the texture width. Bits 0-15 are the texture height. The maximum texture size in either direction is 1024.
| |
| |-
| |
| | 0x0083
| |
| | Texture parameters (filtering, wrapping), see below.
| |
| |-
| |
| | 0x0084
| |
| | LOD setup?
| |
| |-
| |
| | 0x0085
| |
| | Physical address of texture data (divided by 8).
| |
| |-
| |
| | 0x0086
| |
| | Physical address of texture data for cube mapping?
| |
| |-
| |
| | 0x0087
| |
| | Physical address of texture data for cube mapping?
| |
| |-
| |
| | 0x0088
| |
| | Physical address of texture data for cube mapping?
| |
| |-
| |
| | 0x0089
| |
| | Physical address of texture data for cube mapping?
| |
| |-
| |
| | 0x008A
| |
| | Physical address of texture data for cube mapping?
| |
| |-
| |
| | 0x008B
| |
| | Shadow related?
| |
| |-
| |
| | 0x008E
| |
| | Texture format (see below)
| |
| |}
| |
| | |
| == Configuration of texture units 1 and 2 ==
| |
| Texture units 1 and 2 use a configuration block similar to the one of texture unit 0. They are based at registers 0x0091 and 0x0099.
| |
| | |
| {| class="wikitable" border="1"
| |
| ! Index word
| |
| ! Description
| |
| |-
| |
| | 0-4
| |
| | Same as for texture unit 0
| |
| |-
| |
| | 5
| |
| | Texture format (see below)
| |
| |}
| |
| | |
| == Configuration of texture unit 3 ==
| |
| The configuration block for texture unit 3 seems to be vastly different from the other texture units. Instead, registers 0x00A8 through 0x00B7 are used to configure [[GPU/Procedural_Texture_Generation|procedural texturing]] features.
| |
| | |
| == Texture parameters ==
| |
| {| class="wikitable" border="1"
| |
| ! Bit
| |
| ! Description
| |
| ! GL parameter name
| |
| |-
| |
| | 0
| |
| | Normally this is value 0.
| |
| |
| |
| |-
| |
| | 1
| |
| | 0 = point sampling (GL_NEAREST), 1 = linear interpolation (GL_LINEAR)
| |
| | GL_TEXTURE_MAG_FILTER
| |
| |-
| |
| | 2
| |
| | 0 = point sampling (GL_NEAREST*), 1 = linear interpolation (GL_LINEAR*)
| |
| | GL_TEXTURE_MIN_FILTER
| |
| |-
| |
| | 3
| |
| | Unused?
| |
| | ?
| |
| |-
| |
| | 5-4
| |
| | 2 = texture color type 0xC, 0 otherwise.(Enable/disable texture data compression?) 0 = unknown, 1 = unknown, 3 = same effect as value 2.
| |
| |
| |
| |-
| |
| | 7-6
| |
| | Unused
| |
| |-
| |
| | 11-8
| |
| | 0 = GL_CLAMP_TO_EDGE, 1 = GL_CLAMP_TO_BORDER, 2 = GL_REPEAT, 3 = GL_MIRRORED_REPEAT
| |
| | GL_TEXTURE_WRAP_S
| |
| |-
| |
| | 15-12
| |
| | Same values as GL_TEXTURE_WRAP_S.
| |
| | GL_TEXTURE_WRAP_T
| |
| |-
| |
| | 24
| |
| | 0 = no LOD interpolation (GL_*_MIPMAP_NEAREST), 1 = linear LOD interpolation (GL_*_MIPMAP_LINEAR)
| |
| | GL_TEXTURE_MIN_FILTER
| |
| |-
| |
| | 27-25
| |
| | Unused?
| |
| |-
| |
| | 30-28
| |
| | When some flag=1: value1=GL_TEXTURE_2D, value0 when the input parameter is not GL_TEXTURE_2D. When some flag=0: 0=GL_TEXTURE_2D, 1-4=unknown.
| |
| | ?
| |
| |-
| |
| | 31
| |
| | Unused?
| |
| | ?
| |
| |}
| |
| | |
| == Texture color types ==
| |
| {| class="wikitable" border="1"
| |
| ! Value
| |
| ! Description
| |
| ! GL Format
| |
| ! GL Data Type
| |
| |-
| |
| | 0x0
| |
| | RGBA8888
| |
| | GL_RGBA
| |
| | GL_UNSIGNED_BYTE
| |
| |-
| |
| | 0x1
| |
| | RGB888
| |
| | GL_RGB
| |
| | GL_UNSIGNED_BYTE
| |
| |-
| |
| | 0x2
| |
| | RGBA5551
| |
| | GL_RGBA
| |
| | GL_UNSIGNED_SHORT_5_5_5_1
| |
| |-
| |
| | 0x3
| |
| | RGB565
| |
| | GL_RGB
| |
| | GL_UNSIGNED_SHORT_5_6_5
| |
| |-
| |
| | 0x4
| |
| | RGBA4444
| |
| | GL_RGBA
| |
| | GL_UNSIGNED_SHORT_4_4_4_4
| |
| |-
| |
| | 0x5
| |
| | IA8
| |
| | GL_LUMINANCE_ALPHA
| |
| | GL_UNSIGNED_BYTE
| |
| |-
| |
| | 0x6
| |
| | HILO8
| |
| |
| |
| |
| |
| |-
| |
| | 0x7
| |
| | I8
| |
| | GL_LUMINANCE
| |
| | GL_UNSIGNED_BYTE
| |
| |-
| |
| | 0x8
| |
| | A8
| |
| | GL_ALPHA
| |
| | GL_UNSIGNED_BYTE
| |
| |-
| |
| | 0x9
| |
| | IA44
| |
| | GL_LUMINANCE_ALPHA
| |
| | GL_UNSIGNED_BYTE_4_4_EXT
| |
| |-
| |
| | 0xA
| |
| | I4
| |
| |
| |
| |
| |
| |-
| |
| | 0xB
| |
| | A4
| |
| | GL_ALPHA
| |
| | GL_UNSIGNED_NIBBLE_EXT
| |
| |-
| |
| | 0xC
| |
| | ETC1
| |
| | GL_ETC1_RGB8_OES
| |
| |
| |
| |-
| |
| | 0xD
| |
| | ETC1A4
| |
| |
| |
| |
| |
| |}
| |
| | |
| [[Category:GPU]]
| |