skia / external / github.com / KhronosGroup / OpenGL-Registry / 2ba128b63ad6b6e7138e963762a3a6b76f5e1598 / . / extensions / ARB / ARB_matrix_palette.txt

Name | |

ARB_matrix_palette | |

Name Strings | |

GL_ARB_matrix_palette | |

Contact | |

Jon Paul Schelter (jschelte 'at' matrox.com) | |

Notice | |

Copyright (c) 2000-2013 The Khronos Group Inc. Copyright terms at | |

http://www.khronos.org/registry/speccopyright.html | |

Specification Update Policy | |

Khronos-approved extension specifications are updated in response to | |

issues and bugs prioritized by the Khronos OpenGL Working Group. For | |

extensions which have been promoted to a core Specification, fixes will | |

first appear in the latest version of that core Specification, and will | |

eventually be backported to the extension document. This policy is | |

described in more detail at | |

https://www.khronos.org/registry/OpenGL/docs/update_policy.php | |

Status | |

Complete. Approved by ARB on December 5, 2000. | |

Version | |

Date: 2004/04/02 | |

Revision: 0.7 | |

Number | |

ARB Extension #16 | |

Dependencies | |

ARB_vertex_blend and OpenGL 1.0 are required. | |

This extension is written against the ARB_vertex_blend extended | |

OpenGL 1.2.1 Specification. | |

Overview | |

This extension extends the abilities of ARB_vertex_blend to include | |

a palette of modelview matrices. The n vertex units use a palette | |

of m modelview matrices. (Where n and m are constrained to | |

implementation defined maxima.) Each vertex has a set of n | |

indices into the palette, and a corresponding set of n weights. | |

Matrix indices can be changed for each vertex (between Begin and | |

End). | |

When this extension is utilized, the enabled units transform each | |

vertex by the modelview matrices specified by the vertices' | |

respective indices. These results are subsequently scaled by the | |

weights of the respective units and then summed to create the | |

eyespace vertex. | |

A similar procedure is followed for normals. Normals, however, | |

are transformed by the inverse transpose of the modelview matrix. | |

IP Status | |

Unknown, but believed to be none. | |

Issues | |

Should the matrix palette be loaded by adding MODELVIEWm tokens | |

for MatrixMode? | |

No, this method is too difficult to extend to an arbitrary | |

(implementation defined) size palette, | |

and would imply having a 32 entry (minimum) stack per | |

matrix. | |

Should the Matrix palette be loaded with a new LoadMatrixPalette | |

command? | |

No, although this provides an easy way to support arbitrary | |

palette sizes, the method loses the current (MultMatrix, | |

Rotate, Translate, Scale..) matrix functionality. | |

Matrices will be Loaded into the palette with current | |

functions when MATRIX_MODE is MATRIX_PALETTE_ARB. The current | |

palette index is set by an explicit command: | |

CurrentPaletteMatrixARB(). | |

Should the Matrix Palette have a stack? | |

Not required, this wastes a lot of space. Define the min | |

stack depth for the MATRIX_PALETTE_ARB MatrixMode to be 1. | |

This alows some implementations to add a stack if desired. | |

The stacks established in ARB_vertex_blend for | |

MODELVIEW_MATRIXn are still present. | |

Should the matrix palette be gettable? | |

Yes, CurrentPaletteMatrixARB() and | |

GetIntegerv(CURRENT_PALETTE_MATRIX_ARB, *data) define which | |

matrix in the palette is returned by | |

GetFloatv(MATRIX_PALETTE_ARB, *data). | |

Should MatrixIndexARB be changed to imply LoadMatrix calls to the | |

applicable MODELVIEW_MATRIXn stacks? | |

No, the MODELVIEW_MATRIXn matrices are unused when | |

MATRIX_PALETTE is enabled. | |

Should there be a way to specify that the modelview matrices | |

for two different vertex units are identical? | |

Not explicitely, but indexing the matrix palette provides this | |

functionality. (Both units will have the same matrix index.) | |

Currently, the MATRIX_PALETTE_ARB enum is used to enable the | |

extension, to set the Matrix Mode, and to get the current matrix. | |

Is this confusing? Should more enums be added? | |

No. | |

New Procedures and Functions | |

void CurrentPaletteMatrixARB(int index) | |

void MatrixIndex{ubusui}vARB(int size, T *indices) | |

void MatrixIndexPointerARB(int size, enum type, sizei stride, | |

void *pointer) | |

New Tokens | |

Accepted by the <pname> parameters of GetFloatv, GetDoublev, | |

and IsEnabled, by the <mode> parameter of MatrixMode, and by the | |

<cap> parameters of Enable and Disable: | |

MATRIX_PALETTE_ARB: 0x8840 | |

Accepted by the <pname> parameters of GetIntegerv, GetFloatv, and | |

GetDoublev: | |

MAX_MATRIX_PALETTE_STACK_DEPTH_ARB 0x8841 | |

MAX_PALETTE_MATRICES_ARB 0x8842 | |

CURRENT_PALETTE_MATRIX_ARB 0x8843 | |

Accepted by the <cap> parameters of EnableClientState and | |

DisableClientState and by the <pname> parameter of IsEnabled: | |

MATRIX_INDEX_ARRAY_ARB: 0x8844 | |

Accepted by the <pname> parameter of GetFloatv: | |

CURRENT_MATRIX_INDEX_ARB 0x8845 | |

Accepted by the <pname> parameter of GetIntegerv: | |

MATRIX_INDEX_ARRAY_SIZE_ARB 0x8846 | |

MATRIX_INDEX_ARRAY_TYPE_ARB 0x8847 | |

MATRIX_INDEX_ARRAY_STRIDE_ARB 0x8848 | |

Accepted by the <pname> parameter of GetPointerv: | |

MATRIX_INDEX_ARRAY_POINTER_ARB 0x8849 | |

Additions to Chapter 2 of the OpenGL 1.2.1 Specification (Operation) | |

- (2.6, p. 12) Second paragraph changed to: | |

"Each vertex is specified with two, three, or four | |

coordinates. In addition, a current normal, current texture | |

coordinates, current color, current matrix indices, and | |

current weights may be used in processing each vertex. Normals | |

are used by the GL in lighting calculations; the current | |

normal is a three- dimensional vector that may be set by | |

sending three coordinates that specify it. Texture coordinates | |

determine how a texture image is mapped onto a | |

primitive. Indices are used to select modelview matrices | |

from the palette when blending is enabled. Weights are used | |

as blending factors when vertex blending is enabled. One | |

weight and one index exists for each enabled vertex blend | |

unit. Vertex units are enabled with Enable, and disabled | |

with Disable. Enabling or Disabling a vertex unit not | |

supported in the implementation results in the error | |

INVALID_OPERATION." | |

- (2.6.3, p. 19) First paragraph changed to: | |

"The only GL commands that are allowed within Begin/End | |

pairs are the commands for specifying vertex coordinates, | |

vertex color, normal coordinates, texture coordinates, matrix | |

indices, and weights (Vertex, Color, Index, Normal, TexCoord, | |

MatrixIndexARB, WeightARB), the ArrayElement command (see | |

section 2.8), the EvalCoord and EvalPoint commands (see | |

section 5.1), commands for specifying lighting material | |

parameters (Material commands; see section 2.13.2), display | |

list invocation commands (CallList and CallLists; see section | |

5.4), and the EdgeFlag command. Executing any other GL command | |

between the execution of Begin and the corresponding execution | |

of End results in the error INVALID_OPERATION. Executing Begin | |

after Begin has already been executed but before an End is | |

executed generates the INVALID_OPERATION error, as does | |

executing End without a previous corresponding Begin." | |

- (2.7, p. 20) Added after the third paragraph: | |

"The current weights are set using | |

void Weight{bsifd ubusui}vARB(int size, T *weights); | |

the floating point values are assigned to the current | |

weight vector. The first <size> current weights are | |

replaced with <weights> such that: | |

CURRENT_WEIGHT_ARB[i] = <weights>[i] | |

When WEIGHT_SUM_UNITY_ARB is enabled, | |

<size>-1 | |

CURRENT_WEIGHT_ARB[<size>] = 1 - SUM <weights>[i] | |

i=0 | |

otherwise the rest of the current weights are set to 0. If | |

<size> is greater than MAX_VERTEX_UNITS_ARB or if | |

WEIGHTS_SUM_UNITY_ARB is enabled and <size> equals | |

MAX_VERTEX_UNITS_ARB, then the error INVALID_VALUE is | |

generated. When the values are supplied as byte, short, or | |

int, they are converted to floating-point values as | |

indicated for the corresponting type in Table 2.6. | |

The current matrix indices are set using | |

void MatrixIndex{ubusui}vARB(int size, T *indices); | |

The specified indices are set to the first <size> Vertex | |

Unit index values. <size> indicates the count of matrix | |

indices in the <indices> array. | |

Note that vertex units which are disabled can still receive | |

weights and indices." | |

- (2.8, p. 21) First paragraph changed to read: | |

"The vertex specification commands described in section 2.7 | |

accept data in almost any format, but their use requires | |

many command executions to specify even simple geometry. | |

Vertex data may also be placed into arrays that are stored | |

in the client's address space. Blocks of data in these | |

arrays may then be used to specify multiple geometric | |

primitives through the execution of a single GL command. | |

The client may specify an implementation dependent set of | |

arrays: one each to store edge flags, texture coordinates, | |

colors, color indices, normals, and vertices, weights, and | |

matrix indices. The commands | |

void EdgeFlagPointer( sizei stride, void *pointer); | |

void TexCoordPointer( int size, enum type, sizei stride, | |

void *pointer ); | |

void ColorPointer( int size, enum type, sizei stride, | |

void *pointer ); | |

void IndexPointer( enum type, sizei stride, void | |

*pointer ); | |

void NormalPointer( enum type, sizei stride, void | |

*pointer ); | |

void VertexPointer( int size, enum type, sizei stride, | |

void *pointer ); | |

void WeightPointerARB(int size, enum type, | |

sizei stride, void *pointer) | |

void MatrixIndexPointerARB(int size, enum type, | |

sizei stride, void *pointer) | |

describe the locations and organizations of these arrays. | |

For each command, type specifies the data type of the | |

values stored in the array. Because edge flags are always | |

type boolean, EdgeFlagPointer has no type argument. Size, | |

when present, indicates the number of values per vertex | |

that are stored in the array. Because normals are always | |

specified with three values, NormalPointer has no size | |

argument. Likewise, because color indices, and edge flags | |

are always specified with a single value, IndexPointer, and | |

EdgeFlagPointer also have no size argument. Table 2.4 | |

indicates the allowable values for size and type (when | |

present). For type the values BYTE, SHORT, INT, FLOAT, and | |

DOUBLE indicates types byte, short, int, float, and double, | |

respectively; and the values UNSIGNED_BYTE, UNSIGNED_SHORT, | |

and UNSIGNED_INT indicate types ubyte, ushort, and uint, | |

respectively. The error INVALID_VALUE is generated if size | |

is specified with a value other than that indicated in the | |

table. For implementations supporting vertex blending, note | |

that <size> values for WeightPointerARB and | |

MatrixIndexPointerARB must be less than the implementation | |

defined value MAX_VERTEX_UNITS_ARB." | |

- (2.8, p. 22) Change table 2.4 to read: | |

Command Sizes Types | |

------- ----- ----- | |

VertexPointer 2,3,4 short, int, float, | |

double | |

NormalPointer 3 byte, short, int, float, | |

double | |

ColorPointer 3,4 byte, ubyte, short, | |

ushort, int, uint, | |

float, double | |

IndexPointer 1 ubyte, short, int, | |

float, double | |

TexCoordPointer 1,2,3,4 short, int, float, | |

double | |

EdgeFlagPointer 1 boolean | |

WeightPointerARB 1..MAX_VERTEX byte, ubyte, short, | |

_UNITS_ARB ushort, int, uint, | |

float, double | |

MatrixIndexPointerARB 1..MAX_VERTEX unsigned byte, unsigned | |

_UNITS_ARB short, unsigned int | |

- (2.8 p. 23) Change paragraph two to: | |

"An individual array is enabled or disabled by calling one | |

of | |

void EnableClientState( enum array ); | |

void DisableClientState( enum array ); | |

with array set to EDGE_FLAG_ARRAY, TEXTURE_COORD_ARRAY, | |

COLOR_ARRAY, INDEX_ARRAY, NORMAL_ARRAY, VERTEX_ARRAY, | |

MATRIX_INDEX_ARRAY_ARB, or WEIGHT_ARRAY_ARB, for the edge | |

flag, texture coordinate, color, color index, normal, vertex, | |

matrix index, or weight array, respectively. " | |

- (2.8 p. 23) Change paragraph three to: | |

"The ith element of every enabled array is transferred to | |

the GL by calling | |

void ArrayElement( int i ); | |

For each enabled array, it is as though the corresponding | |

command from section 2.7 or 2.6.2 were called with a | |

pointer to element i. For the vertex array, the | |

corresponding command is Vertex[size][type]v, where size is | |

one of [2,3,4], and type is one of [s,i,f,d], corresponding | |

to array types short, int, float, and double respectively. | |

The corresponding commands for the edge flag, texture | |

coordinate, color, color index, normal, and weight arrays | |

are EdgeFlagv, TexCoord[size][type]v, Color[size][type]v, | |

Index[type]v, Normal[type]v, MatrixIndex[type]vARB, and | |

Weight[type]vARB, respectively. If the vertex array is | |

enabled, it is as though Vertex[size][type]v is executed last, | |

after the executions of the other corresponding commands." | |

- (2.10 p. 28) Edit to the last paragraph: | |

"Figure 2.6 diagrams the sequence of transformations that are | |

applied to vertices. The vertex coordinates that are | |

presented to the GL are termed object coordinates. The | |

model-view matrix is applied to these coordinates to yield eye | |

coordinates. In implementations with vertex blending, all | |

enabled modelview matrices are applied to these coordinates, | |

and the weighted sum of the results are the eye coordinates. | |

Then another matrix, called the projection matrix, is applied | |

to eye coordinates to yield clip coordinates. A perspective | |

division is carried out on clip coordinates to yield | |

normalized device coordinates. A final viewport | |

transformation is applied to convert these coordinates into | |

window coordinates." | |

- (2.10 p. 29) Edit to the second paragraph: | |

"... the vertex's eye coordinates are found as: | |

(xe) n-1 (xo) | |

(ye) = SUM w_i * M_i * (yo) | |

(ze) i=0 (zo) | |

(we) (wo) | |

where M_i is the palette matrix associated with the i'th | |

Vertex unit: | |

M_i = MatrixPalette[MatrixIndex[i]], if VERTEX_BLEND_ARB, | |

MATRIX_PALETTE_ARB and VERTEX_UNIT_ARB<i> are enabled, and | |

M_i = MODELVIEW_MATRIX, otherwise. | |

w_i is the Vertex's associated weight for vertex unit i: | |

w_i = weight_i, if VERTEX_BLEND_ARB, MATRIX_PALETTE_ARB | |

and VERTEX_UNIT_ARB<i> are enabled, | |

1, if MATRIX_PALETTE_ARB is disabled, | |

and, | |

n = ACTIVE_VERTEX_UNITS_ARB." | |

- (2.10.2 p. 31) Change the first paragraph to: | |

"The projection matrix and model-view matrices are set | |

with a variety of commands. The affected matrix is | |

determined by the current matrix mode. The current | |

matrix mode is set with | |

void MatrixMode( enum mode ); | |

which takes one of the pre-defined constants TEXTURE, | |

MODELVIEW, COLOR, PROJECTION, MODELVIEWn_ARB, | |

MATRIX_PALETTE_ARB. TEXTURE is described later in section | |

2.10.2, and COLOR is described in section 3.6.3. If the | |

current matrix mode is MODELVIEW, the matrix operations | |

apply to the model-view matrix; if PROJECTION, then they | |

apply to the projection matrix. | |

In implementations supporting ARB_matrix_palette, | |

void CurrentPaletteMatrixARB(int index); | |

defines which of the palette's matrices is affected by | |

subsequent matrix operations when the current matrix mode is | |

MATRIX_PALETTE_ARB. CurrentBlendMatrixARB generates the | |

error INVALID_VALUE if the <index> parameter is not between | |

0 and MAX_PALETTE_MATRICES_ARB. | |

The CURRENT_PALETTE_MATRIX_ARB enum can be used to query the | |

last value set by CurrentPaletteMatrixARB." | |

- (2.10.2 p. 34) Change to the fourth paragraph: | |

"The state required to implement transformations consists of a | |

four-valued integer indicating the current matrix mode, a | |

stack of at least two 4 x 4 matrices for each of COLOR, | |

PROJECTION, and TEXTURE with associated stack pointers, a | |

stack of at least 32 4 x 4 matrices with an associated stack | |

pointer for MODELVIEW, and a set of MAX_PALETTE_MATRICES_ARB | |

stacks of at least 1 4 x 4 matrices each for the matrix palette. | |

Initially, there is only one matrix on each stack, and all | |

matrices are set to the identity. The initial matrix mode | |

is MODELVIEW. | |

- (2.10.3 p. 35) Added after the second paragraph: | |

"When vertex blending is enabled, the normal is transformed | |

to eye space by: | |

n-1 | |

(nx' ny' nz') = (nx ny nz) Inv ( SUM w_i * Mu_i) | |

i=0 | |

Alternatively implementations may choose to transform the | |

normal to eye-space by: | |

n-1 | |

(nx' ny' nz') = SUM w_i * (nx ny nz) Inv(Mu_i) | |

i=0 | |

where Mu_i is the upper leftmost 3x3 matrix taken from the | |

modelview for vertex unit i (M_i), | |

M_i = MatrixPalette[MatrixIndex[i]] | |

if VERTEX_BLEND_ARB, MATRIX_PALETTE_ARB and VERTEX_UNIT_ARB<i> | |

are enabled, and | |

M_i = MODELVIEW_MATRIX | |

otherwise. | |

weight_i is the vertex's associated weight for vertex unit i, | |

w_i = weight_i | |

and | |

n = ACTIVE_VERTEX_UNITS_ARB" | |

Additions to Chapter 3: | |

None | |

Additions to Chapter 4: | |

None | |

Additions to Chapter 5: | |

None | |

Additions to Chapter 6: | |

None | |

Additions to the GLX Specification | |

In progress. | |

Additions to the GLX Stream Protocol: | |

Four new GL rendering commandsl are added. The following commands | |

are sent to the server as part of a glXRender request: | |

MatrixIndexubvARB | |

2 8+n+p rendering command length | |

2 4326 rendering command opcode | |

4 INT32 size | |

1*n CARD8 weights | |

p pad(n) | |

MatrixIndexusvARB | |

2 8+2*n rendering command length | |

2 4327 rendering command opcode | |

4 INT32 size | |

2*n CARD16 weights | |

p pad(2*n) | |

MatrixIndexuivARB | |

2 8+4*n rendering command length | |

2 4328 rendering command opcode | |

4 INT32 size | |

4*n CARD32 weights | |

CurrentPaletteMatrixARB | |

2 8 rendering command length | |

2 4329 rendering command opcode | |

4 INT32 count | |

Errors | |

INVALID_VALUE is generated if the <size> parameter for | |

MatrixIndexARB or MatrixIndexPointerARB is greater than | |

MAX_VERTEX_UNITS_ARB, or if WEIGHT_SUM_UNITY_ARB is enabled | |

and <size> is equal to MAX_VERTEX_UNITS_ARB. | |

INVALID_VALUE is generated if the <count> parameter to | |

CurrentPaletteMatrixARB is greater than MAX_PALETTE_MATRICES_ARB | |

or if <count> is equal to zero. | |

New State | |

Modified State in Table 6.5 (p. 195): | |

Initial | |

Get Value Get Command Type Value Attribute Description | |

--------- ----------- ---- ------- --------- ----------- | |

CURRENT_MATRIX_INDEX_ARB GetIntegerv n*Z+ 0 current array of current matrix indices | |

Modified State in Table 6.6 (p. 196): | |

Initial | |

Get Value Type Get Command Value Description Sec. Attribute | |

--------- ---- ----------- ------- ----------- ---- --------- | |

MATRIX_INDEX_ARRAY_ARB B IsEnabled False Matrix indices enable 2.8 vertex-array | |

MATRIX_INDEX_ARRAY_SIZE_ARB Z+ GetIntegerv 0 Indices per element 2.8 vertex-array | |

MATRIX_INDEX_ARRAY_TYPE_ARB Z_3 GetIntegerv UBYTE Type of indices 2.8 vertex-array | |

MATRIX_INDEX_ARRAY_POINTER_ARB Y GetPointerv False Pointer to the Matrix 2.8 vertex-array | |

indices array | |

Modified state in Table 6.7 (p. 197) Transformation State: | |

Initial | |

Get Value Get Command Type Value Attribute Description | |

--------- ----------- ---- --------- --------- ----------- | |

MATRIX_PALETTE_ARB GetFloatv 2*x1*xM4 Identity - stack of current modelview matrix in the palette | |

MATRIX_PALETTE_ARB IsEnabled B FALSE transform Enable for ARB_matrix_palette | |

CURRENT_PALETTE_ GetIntegerv Z+ 0 transform index of current modelview matrix in the | |

MATRIX_ARB palette, as set by CurrentPaletteMatrixARB() | |

New Implementation Dependent State | |

Modified state in Table 6.24 (p. 214) Implementation Dependant Values: | |

Get Value Get Command Type Min Value Description | |

--------- ----------- ---- --------- ----------- | |

MAX_MATRIX_PALETTE_ GetIntegerv Z+ 1 Max matrix palette stack depth | |

STACK_DEPTH_ARB | |

Modified state in Table 6.25 (p. 215): | |

Get Value Get Command Type Min Value Description | |

--------- ----------- ---- --------- ----------- | |

MAX_PALETTE_MATRICES_ARB GetIntegerv Z+ MAX_VERTEX_ Max size of the matrix palette | |

UNITS_ARB | |

Additions to Appendix A: | |

None | |

Revision History | |

2000/10/17 v 0.3 jschelte - added Usage example. | |

2000/11/09 v 0.4 jschelte - cleaned up some "issues". | |

2000/11/27 v 0.5 jschelte - closed last issue, fixed typo in Usage | |

2000/11/30 v 0.6 jschelte - replaced "blend matrices" with | |

"palette matrices" | |

- cleared up some confusion in the | |

naming of the enum for the current | |

indices and the current palette | |

matrix for load/get. | |

2004/04/02 v 0.7 Thomas Roell - added GLX protocol | |

Addendum: Using this extension. | |

// Get the implementation's capabilities | |

glGetIntegerv(MAX_VERTEX_UNITS_ARB, *max_blends); | |

glGetIntegerv(MAX_PALETTE_MATRICES_ARB, *max_matrices); | |

//validate that max_blends and max_matrices are sufficient here. | |

// enable the units | |

glEnable(VERTEX_UNIT_0_ARB); | |

glEnable(VERTEX_UNIT_1_ARB); | |

glEnable(VERTEX_UNIT_2_ARB); | |

glEnable(VERTEX_UNIT_3_ARB); | |

// Load the matrix Palette | |

glMatrixMode(MATRIX_PALETTE_ARB); | |

for (i=0; i<palette_size; i++) | |

{ | |

glCurrentPaletteMatrix(i); | |

glLoadMatrix(mat[i]); | |

// N.B. | |

// glGetIntegerv(CURRENT_PALETTE_MATRIX_ARB, &index); | |

// .. will return index==i. | |

// glGetFloatv(MATRIX_PALETTE_ARB, &matrix); | |

// .. will return matrix==mat[i]. | |

} | |

// Per vertex array | |

// Enable and define the Vertex Arrays: | |

// e.g. V3F C4UB N3F W4F MI4UB T4F | |

glEnableClientState(VERTEX_ARRAY); | |

glEnableClientState(NORMAL_ARRAY); | |

glEnableClientState(COLOR_ARRAY); | |

glEnableClientState(TEXTURE_COORD_ARRAY); | |

glEnableClientState(WEIGHT_ARRAY_ARB); | |

glEnableClientState(MATRIX_INDEX_ARRAY_ARB); | |

glVertexPointer(3, FLOAT, 3, vertices); | |

glNormalPointer(FLOAT, 3, normals); | |

glColorPointer(4, UNSIGNED_BYTE, 4, colors); | |

glTexCoordPointer(4, FLOAT, 4, texcoords); | |

glWeightPointerARB(4, FLOAT, 4, weights); | |

glMatrixIndexPointerARB(4, UNSIGNED_BYTE, 4, indices); | |

// Draw Primitives from the array | |

glDrawArrays(TRIANGLES, 0, vert_array_size); | |

// **alternatively** | |

typdef struct st_interleaved_vertex { | |

FLOAT position[4]; | |

FLOAT weights[4]; | |

UNSIGNED_BYTE indices[4]; | |

FLOAT normal[3]; | |

FLOAT color[4]; | |

FLOAT texcoord[4]; | |

} interleaved_vertex; | |

interleaved_vertex vertices[NUM_VERTS]; | |

// the rest as above, except the Array Pointer definition: | |

int stride = sizeof(interleaved_vertex); | |

glVertexPointer( 3, FLOAT, stride, &(vertices[0].position) ); | |

glNormalPointer( FLOAT, stride, &(vertices[0].normal) ); | |

glColorPointer( 4, UNSIGNED_BYTE, stride, &(vertices[0].color) ); | |

glTexCoordPointer( 4, FLOAT, stride, &(vertices[0].texcoords) ); | |

glWeightPointerARB( 4, FLOAT, stride, &(vertices[0].weights) ); | |

glMatrixIndexPointerARB( 4, UNSIGNED_BYTE, stride, | |

&(vertices[0].indices) ); | |