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ngl: Reserve a pixel in texture atlases

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This will be used for coloring from the texture.
This commit is contained in:
Matthias Clasen 2021-04-08 22:28:40 -04:00
parent e7963945bb
commit d8ba4b4114
1 changed files with 48 additions and 0 deletions
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48
gsk/ngl/gskngltexturelibrary.c
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@ -20,6 +20,7 @@
#include "config.h"
#include <gdk/gdkglcontextprivate.h>
#include <gsk/gskdebugprivate.h>
#include "gsknglcommandqueueprivate.h"
@ -239,6 +240,51 @@ gsk_ngl_texture_atlas_pack (GskNglTextureAtlas *self,
return rect.was_packed;
}
static void
gsk_ngl_texture_atlas_initialize (GskNglDriver *driver,
GskNglTextureAtlas *atlas)
{
/* Insert a single pixel at 0,0 for use in coloring */
gboolean packed;
int x, y;
guint gl_format;
guint gl_type;
guint8 pixel_data[4 * 3 * 3];
gdk_gl_context_push_debug_group_printf (gdk_gl_context_get_current (),
"Initializing Atlas");
packed = gsk_ngl_texture_atlas_pack (atlas, 3, 3, &x, &y);
g_assert (packed);
g_assert (x == 0 && y == 0);
memset (pixel_data, 255, sizeof pixel_data);
if (gdk_gl_context_get_use_es (gdk_gl_context_get_current ()))
{
gl_format = GL_RGBA;
gl_type = GL_UNSIGNED_BYTE;
}
else
{
gl_format = GL_BGRA;
gl_type = GL_UNSIGNED_INT_8_8_8_8_REV;
}
glBindTexture (GL_TEXTURE_2D, atlas->texture_id);
glTexSubImage2D (GL_TEXTURE_2D, 0,
0, 0,
3, 3,
gl_format, gl_type,
pixel_data);
gdk_gl_context_pop_debug_group (gdk_gl_context_get_current ());
driver->command_queue->n_uploads++;
}
static void
gsk_ngl_texture_atlases_pack (GskNglDriver *driver,
int width,
@ -265,6 +311,8 @@ gsk_ngl_texture_atlases_pack (GskNglDriver *driver,
/* No atlas has enough space, so create a new one... */
atlas = gsk_ngl_driver_create_atlas (driver);
gsk_ngl_texture_atlas_initialize (driver, atlas);
/* Pack it onto that one, which surely has enough space... */
if (!gsk_ngl_texture_atlas_pack (atlas, width, height, &x, &y))
g_assert_not_reached ();