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cogl-journal: Defer expanding the vertices until uploading

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When logging a quad we now only store the 2 vertices representing the
top left and bottom right of the quad. The color is only stored once
per entry. Once we come to upload the data we expand the 2 vertices
into four and copy the color to each vertex. We do this by mapping the
buffer and directly expanding into it. We have to copy the data before
we can render it anyway so it doesn't make much sense to expand the
vertices before uploading and this way should save some space in the
size of the journal. It also makes it slightly easier if we later want
to do pre-processing on the journal entries before uploading such as
doing software clipping.

The modelview matrix is now always copied to the journal entry whereas
before it would only be copied if we aren't doing software
transform. The journal entry struct always has the space for the
modelview matrix so hopefully it's only a small cost to copy the
matrix.

The transform for the four entries is now done using
cogl_matrix_transform_points which may be slightly faster than
transforming them each individually with a call to
cogl_matrix_transfom.
This commit is contained in:
Neil Roberts 2010-11-25 21:08:45 +00:00 committed by Robert Bragg
parent a7d88e1527
commit 22be07c3b5
2 changed files with 172 additions and 100 deletions
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1
clutter/cogl/cogl/cogl-context.h
View File

@ -102,6 +102,7 @@ typedef struct
GArray *journal;
GArray *logged_vertices;
GArray *journal_flush_attributes_array;
size_t journal_needed_vbo_len;
GArray *polygon_vertices;

271
clutter/cogl/cogl/cogl-journal.c
View File

@ -43,7 +43,20 @@
#include <math.h>
/* XXX NB:
* Our journal's vertex data is arranged as follows:
* The data logged in logged_vertices is formatted as follows:
*
* Per entry:
* 4 RGBA GLubytes for the color
* 2 floats for the top left position
* 2 * n_layers floats for the top left texture coordinates
* 2 floats for the bottom right position
* 2 * n_layers floats for the bottom right texture coordinates
*/
#define GET_JOURNAL_ARRAY_STRIDE_FOR_N_LAYERS(N_LAYERS) \
(N_LAYERS * 2 + 2)
/* XXX NB:
* Once in the vertex array, the journal's vertex data is arranged as follows:
* 4 vertices per quad:
* 2 or 3 GLfloats per position (3 when doing software transforms)
* 4 RGBA GLubytes,
@ -54,6 +67,8 @@
* To avoid frequent changes in the stride of our vertex data we always pad
* n_layers to be >= 2
*
* There will be four vertices per quad in the vertex array
*
* When we are transforming quads in software we need to also track the z
* coordinate of transformed vertices.
*
@ -95,7 +110,36 @@ typedef void (*CoglJournalBatchCallback) (CoglJournalEntry *start,
typedef gboolean (*CoglJournalBatchTest) (CoglJournalEntry *entry0,
CoglJournalEntry *entry1);
void
static void
_cogl_journal_dump_logged_quad (guint8 *data, int n_layers)
{
gsize stride = GET_JOURNAL_ARRAY_STRIDE_FOR_N_LAYERS (n_layers);
int i;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
g_print ("n_layers = %d; rgba=0x%02X%02X%02X%02X\n",
n_layers, data[0], data[1], data[2], data[3]);
data += 4;
for (i = 0; i < 2; i++)
{
float *v = (float *)data + (i * stride);
int j;
g_print ("v%d: x = %f, y = %f", i, v[0], v[1]);
for (j = 0; j < n_layers; j++)
{
float *t = v + 2 + TEX_STRIDE * j;
g_print (", tx%d = %f, ty%d = %f", j, t[0], j, t[1]);
}
g_print ("\n");
}
}
static void
_cogl_journal_dump_quad_vertices (guint8 *data, int n_layers)
{
gsize stride = GET_JOURNAL_VB_STRIDE_FOR_N_LAYERS (n_layers);
@ -130,7 +174,7 @@ _cogl_journal_dump_quad_vertices (guint8 *data, int n_layers)
}
}
void
static void
_cogl_journal_dump_quad_batch (guint8 *data, int n_layers, int n_quads)
{
gsize byte_stride = GET_JOURNAL_VB_STRIDE_FOR_N_LAYERS (n_layers) * 4;
@ -139,7 +183,7 @@ _cogl_journal_dump_quad_batch (guint8 *data, int n_layers, int n_quads)
g_print ("_cogl_journal_dump_quad_batch: n_layers = %d, n_quads = %d\n",
n_layers, n_quads);
for (i = 0; i < n_quads; i++)
_cogl_journal_dump_quad_vertices (data + byte_stride * 4 * i, n_layers);
_cogl_journal_dump_quad_vertices (data + byte_stride * 2 * i, n_layers);
}
static void
@ -540,14 +584,18 @@ _cogl_journal_flush_vbo_offsets_and_entries (CoglJournalEntry *batch_start,
{
guint8 *verts;
if (cogl_get_features () & COGL_FEATURE_VBOS)
verts = ((guint8 *)ctx->logged_vertices->data) +
(size_t)state->array_offset;
else
verts = (guint8 *)state->array_offset;
/* Mapping a buffer for read is probably a really bad thing to
do but this will only happen during debugging so it probably
doesn't matter */
verts = (cogl_buffer_map (COGL_BUFFER (state->vertex_array),
COGL_BUFFER_ACCESS_READ, 0) +
state->array_offset);
_cogl_journal_dump_quad_batch (verts,
batch_start->n_layers,
batch_len);
cogl_buffer_unmap (COGL_BUFFER (state->vertex_array));
}
batch_and_call (batch_start,
@ -644,25 +692,95 @@ compare_entry_clip_stacks (CoglJournalEntry *entry0, CoglJournalEntry *entry1)
}
static CoglVertexArray *
upload_vertices (GArray *vertices, CoglJournalFlushState *state)
upload_vertices (const CoglJournalEntry *entries,
int n_entries,
size_t needed_vbo_len,
GArray *vertices)
{
gsize needed_vbo_len;
CoglVertexArray *array;
CoglBuffer *buffer;
const float *vin;
float *vout;
int entry_num;
int i;
_COGL_GET_CONTEXT (ctx, 0);
needed_vbo_len = vertices->len * sizeof (float);
g_assert (needed_vbo_len);
array = cogl_vertex_array_new (needed_vbo_len, NULL);
array = cogl_vertex_array_new (needed_vbo_len * 4, NULL);
buffer = COGL_BUFFER (array);
cogl_buffer_set_update_hint (buffer, COGL_BUFFER_UPDATE_HINT_STATIC);
cogl_buffer_set_data (buffer, 0, vertices->data, needed_vbo_len);
/* As we flush the journal entries in batches we walk forward through the
* above VBO starting at offset 0... */
state->array_offset = 0;
vout = cogl_buffer_map (buffer, COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
vin = &g_array_index (vertices, float, 0);
/* Expand the number of vertices from 2 to 4 while uploading */
for (entry_num = 0; entry_num < n_entries; entry_num++)
{
const CoglJournalEntry *entry = entries + entry_num;
size_t vb_stride = GET_JOURNAL_VB_STRIDE_FOR_N_LAYERS (entry->n_layers);
size_t array_stride =
GET_JOURNAL_ARRAY_STRIDE_FOR_N_LAYERS (entry->n_layers);
/* Copy the color to all four of the vertices */
for (i = 0; i < 4; i++)
memcpy (vout + vb_stride * i + POS_STRIDE, vin, 4);
vin++;
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_SOFTWARE_TRANSFORM))
{
vout[vb_stride * 0] = vin[0];
vout[vb_stride * 0 + 1] = vin[1];
vout[vb_stride * 1] = vin[0];
vout[vb_stride * 1 + 1] = vin[array_stride + 1];
vout[vb_stride * 2] = vin[array_stride];
vout[vb_stride * 2 + 1] = vin[array_stride + 1];
vout[vb_stride * 3] = vin[array_stride];
vout[vb_stride * 3 + 1] = vin[1];
}
else
{
float v[8];
v[0] = vin[0];
v[1] = vin[1];
v[2] = vin[0];
v[3] = vin[array_stride + 1];
v[4] = vin[array_stride];
v[5] = vin[array_stride + 1];
v[6] = vin[array_stride];
v[7] = vin[1];
cogl_matrix_transform_points (&entry->model_view,
2, /* n_components */
sizeof (float) * 2, /* stride_in */
v, /* points_in */
/* strideout */
vb_stride * sizeof (float),
vout, /* points_out */
4 /* n_points */);
}
for (i = 0; i < entry->n_layers; i++)
{
const float *tin = vin + 2;
float *tout = vout + POS_STRIDE + COLOR_STRIDE;
tout[vb_stride * 0 + i * 2] = tin[i * 2];
tout[vb_stride * 0 + 1 + i * 2] = tin[i * 2 + 1];
tout[vb_stride * 1 + i * 2] = tin[i * 2];
tout[vb_stride * 1 + 1 + i * 2] = tin[array_stride + i * 2 + 1];
tout[vb_stride * 2 + i * 2] = tin[array_stride + i * 2];
tout[vb_stride * 2 + 1 + i * 2] = tin[array_stride + i * 2 + 1];
tout[vb_stride * 3 + i * 2] = tin[array_stride + i * 2];
tout[vb_stride * 3 + 1 + i * 2] = tin[i * 2 + 1];
}
vin += array_stride * 2;
vout += vb_stride * 4;
}
cogl_buffer_unmap (buffer);
return array;
}
@ -694,8 +812,13 @@ _cogl_journal_flush (void)
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_BATCHING))
g_print ("BATCHING: journal len = %d\n", ctx->journal->len);
state.vertex_array = upload_vertices (ctx->logged_vertices, &state);
state.vertex_array = upload_vertices (&g_array_index (ctx->journal,
CoglJournalEntry, 0),
ctx->journal->len,
ctx->journal_needed_vbo_len,
ctx->logged_vertices);
state.attributes = ctx->journal_flush_attributes_array;
state.array_offset = 0;
framebuffer = _cogl_get_framebuffer ();
modelview_stack = _cogl_framebuffer_get_modelview_stack (framebuffer);
@ -755,6 +878,8 @@ _cogl_journal_flush (void)
static void
_cogl_journal_init (void)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Here we flush anything that we know must remain constant until the
* next the the journal is flushed. Note: This lets up flush things
* that themselves depend on the journal, such as clip state. */
@ -764,6 +889,8 @@ _cogl_journal_init (void)
_cogl_framebuffer_flush_state (_cogl_get_framebuffer (),
COGL_FRAMEBUFFER_FLUSH_SKIP_MODELVIEW |
COGL_FRAMEBUFFER_FLUSH_SKIP_CLIP_STATE);
ctx->journal_needed_vbo_len = 0;
}
void
@ -775,11 +902,8 @@ _cogl_journal_log_quad (const float *position,
unsigned int tex_coords_len)
{
gsize stride;
gsize byte_stride;
int next_vert;
GLfloat *v;
GLubyte *c;
GLubyte *src_c;
int i;
int next_entry;
guint32 disable_layers;
@ -799,103 +923,51 @@ _cogl_journal_log_quad (const float *position,
if (ctx->logged_vertices->len == 0)
_cogl_journal_init ();
/* The vertex data is logged into a separate array in a layout that can be
* directly passed to OpenGL
*/
/* The vertex data is logged into a separate array. The data needs
to be copied into a vertex array before it's given to GL so we
only store two vertices per quad and expand it to four while
uploading. */
/* XXX: See definition of GET_JOURNAL_VB_STRIDE_FOR_N_LAYERS for details
/* XXX: See definition of GET_JOURNAL_ARRAY_STRIDE_FOR_N_LAYERS for details
* about how we pack our vertex data */
stride = GET_JOURNAL_VB_STRIDE_FOR_N_LAYERS (n_layers);
/* NB: stride is in 32bit words */
byte_stride = stride * 4;
stride = GET_JOURNAL_ARRAY_STRIDE_FOR_N_LAYERS (n_layers);
next_vert = ctx->logged_vertices->len;
g_array_set_size (ctx->logged_vertices, next_vert + 4 * stride);
g_array_set_size (ctx->logged_vertices, next_vert + 2 * stride + 1);
v = &g_array_index (ctx->logged_vertices, GLfloat, next_vert);
c = (GLubyte *)(v + POS_STRIDE);
/* We calculate the needed size of the vbo as we go because it
depends on the number of layers in each entry and it's not easy
calculate based on the length of the logged vertices array */
ctx->journal_needed_vbo_len +=
GET_JOURNAL_VB_STRIDE_FOR_N_LAYERS (n_layers) * 4;
/* XXX: All the jumping around to fill in this strided buffer doesn't
* seem ideal. */
/* XXX: we could defer expanding the vertex data for GL until we come
* to flushing the journal. */
/* FIXME: This is a hacky optimization, since it will break if we
* change the definition of CoglColor: */
_cogl_pipeline_get_colorubv (pipeline, c);
src_c = c;
for (i = 0; i < 3; i++)
{
c += byte_stride;
memcpy (c, src_c, 4);
}
_cogl_pipeline_get_colorubv (pipeline, (guint8 *) v);
v++;
#define X0 0
#define Y0 1
#define X1 2
#define Y1 3
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_SOFTWARE_TRANSFORM))
{
v[0] = position[X0]; v[1] = position[Y0];
v += stride;
v[0] = position[X0]; v[1] = position[Y1];
v += stride;
v[0] = position[X1]; v[1] = position[Y1];
v += stride;
v[0] = position[X1]; v[1] = position[Y0];
}
else
{
CoglMatrix mv;
float x, y, z, w;
cogl_get_modelview_matrix (&mv);
x = position[X0], y = position[Y0], z = 0; w = 1;
cogl_matrix_transform_point (&mv, &x, &y, &z, &w);
v[0] = x; v[1] = y; v[2] = z;
v += stride;
x = position[X0], y = position[Y1], z = 0; w = 1;
cogl_matrix_transform_point (&mv, &x, &y, &z, &w);
v[0] = x; v[1] = y; v[2] = z;
v += stride;
x = position[X1], y = position[Y1], z = 0; w = 1;
cogl_matrix_transform_point (&mv, &x, &y, &z, &w);
v[0] = x; v[1] = y; v[2] = z;
v += stride;
x = position[X1], y = position[Y0], z = 0; w = 1;
cogl_matrix_transform_point (&mv, &x, &y, &z, &w);
v[0] = x; v[1] = y; v[2] = z;
}
#undef X0
#undef Y0
#undef X1
#undef Y1
memcpy (v, position, sizeof (float) * 2);
memcpy (v + stride, position + 2, sizeof (float) * 2);
for (i = 0; i < n_layers; i++)
{
/* XXX: See definition of GET_JOURNAL_VB_STRIDE_FOR_N_LAYERS for details
* about how we pack our vertex data */
GLfloat *t = &g_array_index (ctx->logged_vertices, GLfloat,
next_vert + POS_STRIDE +
COLOR_STRIDE + TEX_STRIDE * i);
/* XXX: See definition of GET_JOURNAL_ARRAY_STRIDE_FOR_N_LAYERS
* for details about how we pack our vertex data */
GLfloat *t = v + 2 + i * 2;
t[0] = tex_coords[i * 4 + 0]; t[1] = tex_coords[i * 4 + 1];
t += stride;
t[0] = tex_coords[i * 4 + 0]; t[1] = tex_coords[i * 4 + 3];
t += stride;
t[0] = tex_coords[i * 4 + 2]; t[1] = tex_coords[i * 4 + 3];
t += stride;
t[0] = tex_coords[i * 4 + 2]; t[1] = tex_coords[i * 4 + 1];
memcpy (t, tex_coords + i * 4, sizeof (float) * 2);
memcpy (t + stride, tex_coords + i * 4 + 2, sizeof (float) * 2);
}
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_JOURNAL))
{
g_print ("Logged new quad:\n");
v = &g_array_index (ctx->logged_vertices, GLfloat, next_vert);
_cogl_journal_dump_quad_vertices ((guint8 *)v, n_layers);
_cogl_journal_dump_logged_quad ((guint8 *)v, n_layers);
}
next_entry = ctx->journal->len;
@ -940,8 +1012,7 @@ _cogl_journal_log_quad (const float *position,
if (G_UNLIKELY (source != pipeline))
cogl_handle_unref (source);
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_SOFTWARE_TRANSFORM))
cogl_get_modelview_matrix (&entry->model_view);
cogl_get_modelview_matrix (&entry->model_view);
if (G_UNLIKELY (cogl_debug_flags & COGL_DEBUG_DISABLE_BATCHING))
_cogl_journal_flush ();