/**
* Generate a set of unique array object IDs and store them in \c arrays.
* Helper for _mesa_GenVertexArrays[APPLE]() functions below.
* \param n Number of IDs to generate.
* \param arrays Array of \c n locations to store the IDs.
* \param vboOnly Will arrays have to reside in VBOs?
*/
static void
gen_vertex_arrays(struct gl_context *ctx, GLsizei n, GLuint *arrays)
{
GLuint first;
GLint i;
ASSERT_OUTSIDE_BEGIN_END(ctx);
if (n < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "glGenVertexArraysAPPLE");
return;
}
if (!arrays) {
return;
}
first = _mesa_HashFindFreeKeyBlock(ctx->Array.Objects, n);
/* Allocate new, empty array objects and return identifiers */
for (i = 0; i < n; i++) {
struct gl_array_object *obj;
GLuint name = first + i;
obj = (*ctx->Driver.NewArrayObject)( ctx, name );
if (!obj) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenVertexArraysAPPLE");
return;
}
save_array_object(ctx, obj);
arrays[i] = first + i;
}
}
/**
* Helper for _mesa_BindVertexArray() and _mesa_BindVertexArrayAPPLE().
* \param genRequired specifies behavour when id was not generated with
* glGenVertexArrays().
*/
static void
bind_vertex_array(struct gl_context *ctx, GLuint id, GLboolean genRequired)
{
struct gl_array_object * const oldObj = ctx->Array.ArrayObj;
struct gl_array_object *newObj = NULL;
ASSERT_OUTSIDE_BEGIN_END(ctx);
ASSERT(oldObj != NULL);
if ( oldObj->Name == id )
return; /* rebinding the same array object- no change */
/*
* Get pointer to new array object (newObj)
*/
if (id == 0) {
/* The spec says there is no array object named 0, but we use
* one internally because it simplifies things.
*/
newObj = ctx->Array.DefaultArrayObj;
}
else {
/* non-default array object */
newObj = lookup_arrayobj(ctx, id);
if (!newObj) {
if (genRequired) {
_mesa_error(ctx, GL_INVALID_OPERATION, "glBindVertexArray(id)");
return;
}
/* For APPLE version, generate a new array object now */
newObj = (*ctx->Driver.NewArrayObject)(ctx, id);
if (!newObj) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindVertexArrayAPPLE");
return;
}
save_array_object(ctx, newObj);
}
if (!newObj->_Used) {
/* The "Interactions with APPLE_vertex_array_object" section of the
* GL_ARB_vertex_array_object spec says:
*
* "The first bind call, either BindVertexArray or
* BindVertexArrayAPPLE, determines the semantic of the object."
*/
newObj->ARBsemantics = genRequired;
newObj->_Used = GL_TRUE;
}
}
ctx->NewState |= _NEW_ARRAY;
ctx->Array.NewState |= VERT_BIT_ALL;
_mesa_reference_array_object(ctx, &ctx->Array.ArrayObj, newObj);
/* Pass BindVertexArray call to device driver */
if (ctx->Driver.BindArrayObject && newObj)
ctx->Driver.BindArrayObject(ctx, newObj);
}
/**
* Generate a set of unique array object IDs and store them in \c arrays.
* Helper for _mesa_GenVertexArrays[APPLE]() and _mesa_CreateVertexArrays()
* below.
*
* \param n Number of IDs to generate.
* \param arrays Array of \c n locations to store the IDs.
* \param create Indicates that the objects should also be created.
* \param func The name of the GL entry point.
*/
static void
gen_vertex_arrays(struct gl_context *ctx, GLsizei n, GLuint *arrays,
bool create, const char *func)
{
GLuint first;
GLint i;
if (n < 0) {
_mesa_error(ctx, GL_INVALID_VALUE, "%s(n < 0)", func);
return;
}
if (!arrays) {
return;
}
first = _mesa_HashFindFreeKeyBlock(ctx->Array.Objects, n);
/* For the sake of simplicity we create the array objects in both
* the Gen* and Create* cases. The only difference is the value of
* EverBound, which is set to true in the Create* case.
*/
for (i = 0; i < n; i++) {
struct gl_vertex_array_object *obj;
GLuint name = first + i;
obj = _mesa_new_vao(ctx, name);
if (!obj) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", func);
return;
}
obj->EverBound = create;
save_array_object(ctx, obj);
arrays[i] = first + i;
}
}
/**
* Helper for _mesa_BindVertexArray() and _mesa_BindVertexArrayAPPLE().
* \param genRequired specifies behavour when id was not generated with
* glGenVertexArrays().
*/
static void
bind_vertex_array(struct gl_context *ctx, GLuint id, GLboolean genRequired)
{
struct gl_vertex_array_object * const oldObj = ctx->Array.VAO;
struct gl_vertex_array_object *newObj = NULL;
assert(oldObj != NULL);
if ( oldObj->Name == id )
return; /* rebinding the same array object- no change */
/*
* Get pointer to new array object (newObj)
*/
if (id == 0) {
/* The spec says there is no array object named 0, but we use
* one internally because it simplifies things.
*/
newObj = ctx->Array.DefaultVAO;
}
else {
/* non-default array object */
newObj = _mesa_lookup_vao(ctx, id);
if (!newObj) {
if (genRequired) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glBindVertexArray(non-gen name)");
return;
}
/* For APPLE version, generate a new array object now */
newObj = _mesa_new_vao(ctx, id);
if (!newObj) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindVertexArrayAPPLE");
return;
}
save_array_object(ctx, newObj);
}
if (!newObj->EverBound) {
/* The "Interactions with APPLE_vertex_array_object" section of the
* GL_ARB_vertex_array_object spec says:
*
* "The first bind call, either BindVertexArray or
* BindVertexArrayAPPLE, determines the semantic of the object."
*/
newObj->ARBsemantics = genRequired;
newObj->EverBound = GL_TRUE;
}
}
if (ctx->Array.DrawMethod == DRAW_ARRAYS) {
/* The _DrawArrays pointer is pointing at the VAO being unbound and
* that VAO may be in the process of being deleted. If it's not going
* to be deleted, this will have no effect, because the pointer needs
* to be updated by the VBO module anyway.
*
* Before the VBO module can update the pointer, we have to set it
* to NULL for drivers not to set up arrays which are not bound,
* or to prevent a crash if the VAO being unbound is going to be
* deleted.
*/
ctx->Array._DrawArrays = NULL;
ctx->Array.DrawMethod = DRAW_NONE;
}
ctx->NewState |= _NEW_ARRAY;
_mesa_reference_vao(ctx, &ctx->Array.VAO, newObj);
}
