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gsk: Add GL driver API to create render targets

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It's going to be used by the GL renderer to safely create and bind
FBOs when needed.
This commit is contained in:
Emmanuele Bassi 2016-07-12 15:41:31 +01:00
parent 9836d2259f
commit e2a43a8701
2 changed files with 91 additions and 15 deletions
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104
gsk/gskgldriver.c
View File

@ -13,6 +13,7 @@ typedef struct {
int height;
GLuint min_filter;
GLuint mag_filter;
GArray *fbos;
} Texture;
typedef struct {
@ -28,12 +29,15 @@ struct _GskGLDriver
GdkGLContext *gl_context;
GLuint default_fbo;
GHashTable *textures;
GArray *vaos;
Texture *bound_source_texture;
Texture *bound_mask_texture;
Vao *bound_vao;
GLuint bound_fbo;
gboolean in_frame : 1;
};
@ -60,10 +64,19 @@ texture_free (gpointer data)
{
Texture *t = data;
g_clear_pointer (&t->fbos, g_array_unref);
glDeleteTextures (1, &t->texture_id);
g_slice_free (Texture, t);
}
static void
fbo_clear (gpointer data)
{
GLuint fbo_id = GPOINTER_TO_UINT (data);
glDeleteFramebuffers (1, &fbo_id);
}
static void
vao_clear (gpointer data)
{
@ -168,6 +181,9 @@ gsk_gl_driver_begin_frame (GskGLDriver *driver)
driver->in_frame = TRUE;
glGetIntegerv (GL_FRAMEBUFFER_BINDING, (GLint *) &driver->default_fbo);
driver->bound_fbo = driver->default_fbo;
glActiveTexture (GL_TEXTURE0);
glBindTexture (GL_TEXTURE_2D, 0);
@ -193,6 +209,7 @@ gsk_gl_driver_end_frame (GskGLDriver *driver)
driver->bound_source_texture = NULL;
driver->bound_mask_texture = NULL;
driver->bound_vao = NULL;
driver->bound_fbo = driver->default_fbo;
g_hash_table_remove_all (driver->textures);
g_array_set_size (driver->vaos, 0);
@ -200,6 +217,29 @@ gsk_gl_driver_end_frame (GskGLDriver *driver)
driver->in_frame = FALSE;
}
static Texture *
gsk_gl_driver_get_texture (GskGLDriver *driver,
int texture_id)
{
return g_hash_table_lookup (driver->textures, GINT_TO_POINTER (texture_id));
}
static Vao *
gsk_gl_driver_get_vao (GskGLDriver *driver,
int vao_id)
{
int i;
for (i = 0; i < driver->vaos->len; i++)
{
Vao *v = &g_array_index (driver->vaos, Vao, i);
if (v->vao_id == vao_id)
return v;
}
return NULL;
}
int
gsk_gl_driver_create_texture (GskGLDriver *driver,
int width,
@ -273,27 +313,34 @@ gsk_gl_driver_create_vao_for_quad (GskGLDriver *driver,
return vao_id;
}
static Texture *
gsk_gl_driver_get_texture (GskGLDriver *driver,
int texture_id)
int
gsk_gl_driver_create_render_target (GskGLDriver *driver,
int texture_id)
{
return g_hash_table_lookup (driver->textures, GINT_TO_POINTER (texture_id));
}
Texture *t;
GLuint fbo_id;
static Vao *
gsk_gl_driver_get_vao (GskGLDriver *driver,
int vao_id)
{
int i;
g_return_val_if_fail (GSK_IS_GL_DRIVER (driver), -1);
for (i = 0; i < driver->vaos->len; i++)
t = gsk_gl_driver_get_texture (driver, texture_id);
if (t == NULL)
return -1;
if (t->fbos == NULL)
{
Vao *v = &g_array_index (driver->vaos, Vao, i);
if (v->vao_id == vao_id)
return v;
t->fbos = g_array_new (FALSE, FALSE, sizeof (GLuint));
g_array_set_clear_func (t->fbos, fbo_clear);
}
return NULL;
glGenFramebuffers (1, &fbo_id);
glBindFramebuffer (GL_FRAMEBUFFER, fbo_id);
glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, t->texture_id, 0);
g_array_append_val (t->fbos, fbo_id);
glBindFramebuffer (GL_FRAMEBUFFER, driver->default_fbo);
return fbo_id;
}
void
@ -366,6 +413,33 @@ gsk_gl_driver_bind_vao (GskGLDriver *driver,
}
}
void
gsk_gl_driver_bind_render_target (GskGLDriver *driver,
int texture_id)
{
GLuint fbo_id;
Texture *t;
g_return_if_fail (GSK_IS_GL_DRIVER (driver));
g_return_if_fail (driver->in_frame);
t = gsk_gl_driver_get_texture (driver, texture_id);
if (t == NULL)
return;
if (t->fbos == NULL)
fbo_id = driver->default_fbo;
else
fbo_id = g_array_index (t->fbos, GLuint, 0);
if (fbo_id != driver->bound_fbo)
{
glBindFramebuffer (GL_FRAMEBUFFER, fbo_id);
driver->bound_fbo = fbo_id;
}
}
void
gsk_gl_driver_render_surface_to_texture (GskGLDriver *driver,
cairo_surface_t *surface,

2
gsk/gskgldriverprivate.h
View File

@ -31,6 +31,8 @@ int gsk_gl_driver_create_vao_for_quad (GskGLDriver *driver
int uv_id,
int n_vertices,
GskQuadVertex *vertices);
int gsk_gl_driver_create_render_target (GskGLDriver *driver,
int texture_id);
void gsk_gl_driver_bind_source_texture (GskGLDriver *driver,
int texture_id);