/**
* Set up for drawing interleaved arrays that all live in one VBO
* or all live in user space.
* \param vbuffer returns vertex buffer info
* \param velements returns vertex element info
*/
static boolean
setup_interleaved_attribs(const struct st_vertex_program *vp,
const struct st_vp_variant *vpv,
const struct gl_client_array **arrays,
struct pipe_vertex_buffer *vbuffer,
struct pipe_vertex_element velements[])
{
GLuint attr;
const GLubyte *low_addr = NULL;
GLboolean usingVBO; /* all arrays in a VBO? */
struct gl_buffer_object *bufobj;
GLsizei stride;
/* Find the lowest address of the arrays we're drawing,
* Init bufobj and stride.
*/
if (vpv->num_inputs) {
const GLuint mesaAttr0 = vp->index_to_input[0];
const struct gl_client_array *array = arrays[mesaAttr0];
/* Since we're doing interleaved arrays, we know there'll be at most
* one buffer object and the stride will be the same for all arrays.
* Grab them now.
*/
bufobj = array->BufferObj;
stride = array->StrideB;
low_addr = arrays[vp->index_to_input[0]]->Ptr;
for (attr = 1; attr < vpv->num_inputs; attr++) {
const GLubyte *start = arrays[vp->index_to_input[attr]]->Ptr;
low_addr = MIN2(low_addr, start);
}
}
else {
/* not sure we'll ever have zero inputs, but play it safe */
bufobj = NULL;
stride = 0;
low_addr = 0;
}
/* are the arrays in user space? */
usingVBO = _mesa_is_bufferobj(bufobj);
for (attr = 0; attr < vpv->num_inputs; attr++) {
const GLuint mesaAttr = vp->index_to_input[attr];
const struct gl_client_array *array = arrays[mesaAttr];
unsigned src_offset = (unsigned) (array->Ptr - low_addr);
assert(array->_ElementSize ==
_mesa_bytes_per_vertex_attrib(array->Size, array->Type));
velements[attr].src_offset = src_offset;
velements[attr].instance_divisor = array->InstanceDivisor;
velements[attr].vertex_buffer_index = 0;
velements[attr].src_format = st_pipe_vertex_format(array->Type,
array->Size,
array->Format,
array->Normalized,
array->Integer);
assert(velements[attr].src_format);
}
/*
* Return the vbuffer info and setup user-space attrib info, if needed.
*/
if (vpv->num_inputs == 0) {
/* just defensive coding here */
vbuffer->buffer = NULL;
vbuffer->user_buffer = NULL;
vbuffer->buffer_offset = 0;
vbuffer->stride = 0;
}
else if (usingVBO) {
/* all interleaved arrays in a VBO */
struct st_buffer_object *stobj = st_buffer_object(bufobj);
if (!stobj || !stobj->buffer) {
return FALSE; /* out-of-memory error probably */
}
vbuffer->buffer = stobj->buffer;
vbuffer->user_buffer = NULL;
vbuffer->buffer_offset = pointer_to_offset(low_addr);
vbuffer->stride = stride;
}
else {
/* all interleaved arrays in user memory */
vbuffer->buffer = NULL;
vbuffer->user_buffer = low_addr;
vbuffer->buffer_offset = 0;
vbuffer->stride = stride;
}
return TRUE;
}
/**
* Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
* vertex attribute.
* \param vbuffer returns vertex buffer info
* \param velements returns vertex element info
*/
static boolean
setup_non_interleaved_attribs(struct st_context *st,
const struct st_vertex_program *vp,
const struct st_vp_variant *vpv,
const struct gl_client_array **arrays,
struct pipe_vertex_buffer vbuffer[],
struct pipe_vertex_element velements[])
{
struct gl_context *ctx = st->ctx;
GLuint attr;
for (attr = 0; attr < vpv->num_inputs; attr++) {
const GLuint mesaAttr = vp->index_to_input[attr];
const struct gl_client_array *array = arrays[mesaAttr];
struct gl_buffer_object *bufobj = array->BufferObj;
GLsizei stride = array->StrideB;
assert(array->_ElementSize ==
_mesa_bytes_per_vertex_attrib(array->Size, array->Type));
if (_mesa_is_bufferobj(bufobj)) {
/* Attribute data is in a VBO.
* Recall that for VBOs, the gl_client_array->Ptr field is
* really an offset from the start of the VBO, not a pointer.
*/
struct st_buffer_object *stobj = st_buffer_object(bufobj);
if (!stobj || !stobj->buffer) {
return FALSE; /* out-of-memory error probably */
}
vbuffer[attr].buffer = stobj->buffer;
vbuffer[attr].user_buffer = NULL;
vbuffer[attr].buffer_offset = pointer_to_offset(array->Ptr);
}
else {
/* wrap user data */
void *ptr;
if (array->Ptr) {
ptr = (void *) array->Ptr;
}
else {
/* no array, use ctx->Current.Attrib[] value */
ptr = (void *) ctx->Current.Attrib[mesaAttr];
stride = 0;
}
assert(ptr);
vbuffer[attr].buffer = NULL;
vbuffer[attr].user_buffer = ptr;
vbuffer[attr].buffer_offset = 0;
}
/* common-case setup */
vbuffer[attr].stride = stride; /* in bytes */
velements[attr].src_offset = 0;
velements[attr].instance_divisor = array->InstanceDivisor;
velements[attr].vertex_buffer_index = attr;
velements[attr].src_format = st_pipe_vertex_format(array->Type,
array->Size,
array->Format,
array->Normalized,
array->Integer);
assert(velements[attr].src_format);
}
return TRUE;
}
/**
* Return a PIPE_FORMAT_x for the given GL datatype and size.
*/
static enum pipe_format
st_pipe_vertex_format(const struct gl_vertex_format *vformat)
{
const GLubyte size = vformat->Size;
const GLenum16 format = vformat->Format;
const bool normalized = vformat->Normalized;
const bool integer = vformat->Integer;
GLenum16 type = vformat->Type;
unsigned index;
assert(size >= 1 && size <= 4);
assert(format == GL_RGBA || format == GL_BGRA);
assert(vformat->_ElementSize == _mesa_bytes_per_vertex_attrib(size, type));
switch (type) {
case GL_HALF_FLOAT_OES:
type = GL_HALF_FLOAT;
break;
case GL_INT_2_10_10_10_REV:
assert(size == 4 && !integer);
if (format == GL_BGRA) {
if (normalized)
return PIPE_FORMAT_B10G10R10A2_SNORM;
else
return PIPE_FORMAT_B10G10R10A2_SSCALED;
} else {
if (normalized)
return PIPE_FORMAT_R10G10B10A2_SNORM;
else
return PIPE_FORMAT_R10G10B10A2_SSCALED;
}
break;
case GL_UNSIGNED_INT_2_10_10_10_REV:
assert(size == 4 && !integer);
if (format == GL_BGRA) {
if (normalized)
return PIPE_FORMAT_B10G10R10A2_UNORM;
else
return PIPE_FORMAT_B10G10R10A2_USCALED;
} else {
if (normalized)
return PIPE_FORMAT_R10G10B10A2_UNORM;
else
return PIPE_FORMAT_R10G10B10A2_USCALED;
}
break;
case GL_UNSIGNED_INT_10F_11F_11F_REV:
assert(size == 3 && !integer && format == GL_RGBA);
return PIPE_FORMAT_R11G11B10_FLOAT;
case GL_UNSIGNED_BYTE:
if (format == GL_BGRA) {
/* this is an odd-ball case */
assert(normalized);
return PIPE_FORMAT_B8G8R8A8_UNORM;
}
break;
}
index = integer*2 + normalized;
assert(index <= 2);
assert(type >= GL_BYTE && type <= GL_FIXED);
return vertex_formats[type - GL_BYTE][index][size-1];
}
