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texture-tower: Remove CPU codepath for mipmap generation

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The CPU codepath for mipmapping is unusably slow, and we expect modern
graphics cards with modern TFP/FBO support.
This commit is contained in:
Jasper St. Pierre 2013-08-20 16:32:02 -04:00
parent ad159d3ebd
commit f42682711b
1 changed files with 2 additions and 139 deletions
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141
src/compositor/meta-texture-tower.c
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@ -383,7 +383,7 @@ texture_tower_create_texture (MetaTextureTower *tower,
tower->invalid[level].y2 = height;
}
static gboolean
static void
texture_tower_revalidate_fbo (MetaTextureTower *tower,
int level)
{
@ -418,150 +418,13 @@ texture_tower_revalidate_fbo (MetaTextureTower *tower,
(2. * invalid->y2) / source_texture_height);
cogl_pop_framebuffer ();
return TRUE;
}
static void
fill_copy (guchar *buf,
const guchar *source,
int width)
{
memcpy (buf, source, width * 4);
}
static void
fill_scale_down (guchar *buf,
const guchar *source,
int width)
{
while (width > 1)
{
buf[0] = (source[0] + source[4]) / 2;
buf[1] = (source[1] + source[5]) / 2;
buf[2] = (source[2] + source[6]) / 2;
buf[3] = (source[3] + source[7]) / 2;
buf += 4;
source += 8;
width -= 2;
}
if (width > 0)
{
buf[0] = source[0] / 2;
buf[1] = source[1] / 2;
buf[2] = source[2] / 2;
buf[3] = source[3] / 2;
}
}
static void
texture_tower_revalidate_client (MetaTextureTower *tower,
int level)
{
CoglTexture *source_texture = tower->textures[level - 1];
int source_texture_width = cogl_texture_get_width (source_texture);
int source_texture_height = cogl_texture_get_height (source_texture);
guint source_rowstride;
guchar *source_data;
CoglTexture *dest_texture = tower->textures[level];
int dest_texture_width = cogl_texture_get_width (dest_texture);
int dest_texture_height = cogl_texture_get_height (dest_texture);
int dest_x = tower->invalid[level].x1;
int dest_y = tower->invalid[level].y1;
int dest_width = tower->invalid[level].x2 - tower->invalid[level].x1;
int dest_height = tower->invalid[level].y2 - tower->invalid[level].y1;
guchar *dest_data;
guchar *source_tmp1 = NULL, *source_tmp2 = NULL;
int i, j;
source_rowstride = source_texture_width * 4;
source_data = g_malloc (source_texture_height * source_rowstride);
cogl_texture_get_data (source_texture, TEXTURE_FORMAT, source_rowstride,
source_data);
dest_data = g_malloc (dest_height * dest_width * 4);
if (dest_texture_height < source_texture_height)
{
source_tmp1 = g_malloc (dest_width * 4);
source_tmp2 = g_malloc (dest_width * 4);
}
for (i = 0; i < dest_height; i++)
{
guchar *dest_row = dest_data + i * dest_width * 4;
if (dest_texture_height < source_texture_height)
{
guchar *source1, *source2;
guchar *dest;
if (dest_texture_width < source_texture_width)
{
fill_scale_down (source_tmp1,
source_data + ((i + dest_y) * 2) * source_rowstride + dest_x * 2 * 4,
dest_width * 2);
fill_scale_down (source_tmp2,
source_data + ((i + dest_y) * 2 + 1) * source_rowstride + dest_x * 2 * 4,
dest_width * 2);
}
else
{
fill_copy (source_tmp1,
source_data + ((i + dest_y) * 2) * source_rowstride + dest_x * 4,
dest_width);
fill_copy (source_tmp2,
source_data + ((i + dest_y) * 2 + 1) * source_rowstride + dest_x * 4,
dest_width);
}
source1 = source_tmp1;
source2 = source_tmp2;
dest = dest_row;
for (j = 0; j < dest_width * 4; j++)
*(dest++) = (*(source1++) + *(source2++)) / 2;
}
else
{
if (dest_texture_width < source_texture_width)
fill_scale_down (dest_row,
source_data + (i + dest_y) * source_rowstride + dest_x * 2 * 4,
dest_width * 2);
else
fill_copy (dest_row,
source_data + (i + dest_y) * source_rowstride,
dest_width);
}
}
cogl_texture_set_region (dest_texture,
0, 0,
dest_x, dest_y,
dest_width, dest_height,
dest_width, dest_height,
TEXTURE_FORMAT,
4 * dest_width,
dest_data);
if (dest_texture_height < source_texture_height)
{
g_free (source_tmp1);
g_free (source_tmp2);
}
g_free (source_data);
g_free (dest_data);
}
static void
texture_tower_revalidate (MetaTextureTower *tower,
int level)
{
if (!texture_tower_revalidate_fbo (tower, level))
texture_tower_revalidate_client (tower, level);
texture_tower_revalidate_fbo (tower, level);
}
/**