texture-tower: Remove CPU codepath for mipmap generation
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
parent
797c46ba7d
commit
99ad5c00a7
1 changed files with 2 additions and 139 deletions
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@ -373,7 +373,7 @@ texture_tower_create_texture (MetaTextureTower *tower,
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tower->invalid[level].y2 = height;
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}
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static gboolean
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static void
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texture_tower_revalidate_fbo (MetaTextureTower *tower,
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int level)
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{
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@ -408,150 +408,13 @@ texture_tower_revalidate_fbo (MetaTextureTower *tower,
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(2. * invalid->y2) / source_texture_height);
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cogl_pop_framebuffer ();
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return TRUE;
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}
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static void
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fill_copy (guchar *buf,
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const guchar *source,
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int width)
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{
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memcpy (buf, source, width * 4);
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}
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static void
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fill_scale_down (guchar *buf,
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const guchar *source,
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int width)
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{
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while (width > 1)
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{
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buf[0] = (source[0] + source[4]) / 2;
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buf[1] = (source[1] + source[5]) / 2;
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buf[2] = (source[2] + source[6]) / 2;
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buf[3] = (source[3] + source[7]) / 2;
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buf += 4;
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source += 8;
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width -= 2;
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}
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if (width > 0)
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{
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buf[0] = source[0] / 2;
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buf[1] = source[1] / 2;
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buf[2] = source[2] / 2;
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buf[3] = source[3] / 2;
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}
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}
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static void
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texture_tower_revalidate_client (MetaTextureTower *tower,
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int level)
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{
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CoglTexture *source_texture = tower->textures[level - 1];
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int source_texture_width = cogl_texture_get_width (source_texture);
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int source_texture_height = cogl_texture_get_height (source_texture);
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guint source_rowstride;
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guchar *source_data;
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CoglTexture *dest_texture = tower->textures[level];
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int dest_texture_width = cogl_texture_get_width (dest_texture);
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int dest_texture_height = cogl_texture_get_height (dest_texture);
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int dest_x = tower->invalid[level].x1;
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int dest_y = tower->invalid[level].y1;
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int dest_width = tower->invalid[level].x2 - tower->invalid[level].x1;
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int dest_height = tower->invalid[level].y2 - tower->invalid[level].y1;
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guchar *dest_data;
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guchar *source_tmp1 = NULL, *source_tmp2 = NULL;
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int i, j;
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source_rowstride = source_texture_width * 4;
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source_data = g_malloc (source_texture_height * source_rowstride);
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cogl_texture_get_data (source_texture, TEXTURE_FORMAT, source_rowstride,
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source_data);
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dest_data = g_malloc (dest_height * dest_width * 4);
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if (dest_texture_height < source_texture_height)
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{
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source_tmp1 = g_malloc (dest_width * 4);
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source_tmp2 = g_malloc (dest_width * 4);
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}
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for (i = 0; i < dest_height; i++)
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{
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guchar *dest_row = dest_data + i * dest_width * 4;
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if (dest_texture_height < source_texture_height)
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{
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guchar *source1, *source2;
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guchar *dest;
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if (dest_texture_width < source_texture_width)
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{
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fill_scale_down (source_tmp1,
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source_data + ((i + dest_y) * 2) * source_rowstride + dest_x * 2 * 4,
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dest_width * 2);
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fill_scale_down (source_tmp2,
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source_data + ((i + dest_y) * 2 + 1) * source_rowstride + dest_x * 2 * 4,
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dest_width * 2);
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}
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else
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{
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fill_copy (source_tmp1,
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source_data + ((i + dest_y) * 2) * source_rowstride + dest_x * 4,
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dest_width);
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fill_copy (source_tmp2,
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source_data + ((i + dest_y) * 2 + 1) * source_rowstride + dest_x * 4,
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dest_width);
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}
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source1 = source_tmp1;
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source2 = source_tmp2;
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dest = dest_row;
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for (j = 0; j < dest_width * 4; j++)
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*(dest++) = (*(source1++) + *(source2++)) / 2;
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}
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else
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{
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if (dest_texture_width < source_texture_width)
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fill_scale_down (dest_row,
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source_data + (i + dest_y) * source_rowstride + dest_x * 2 * 4,
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dest_width * 2);
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else
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fill_copy (dest_row,
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source_data + (i + dest_y) * source_rowstride,
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dest_width);
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}
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}
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cogl_texture_set_region (dest_texture,
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0, 0,
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dest_x, dest_y,
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dest_width, dest_height,
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dest_width, dest_height,
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TEXTURE_FORMAT,
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4 * dest_width,
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dest_data);
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if (dest_texture_height < source_texture_height)
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{
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g_free (source_tmp1);
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g_free (source_tmp2);
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}
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g_free (source_data);
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g_free (dest_data);
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}
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static void
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texture_tower_revalidate (MetaTextureTower *tower,
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int level)
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{
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if (!texture_tower_revalidate_fbo (tower, level))
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texture_tower_revalidate_client (tower, level);
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texture_tower_revalidate_fbo (tower, level);
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}
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/**
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