glamor_pixmap_fbo *
glamor_es2_pixmap_read_prepare(PixmapPtr source, int x, int y, int w, int h,
GLenum format, GLenum type, int no_alpha,
int revert, int swap_rb)
{
glamor_pixmap_private *source_priv;
glamor_screen_private *glamor_priv;
ScreenPtr screen;
glamor_pixmap_fbo *temp_fbo;
float temp_xscale, temp_yscale, source_xscale, source_yscale;
static float vertices[8];
static float texcoords[8];
screen = source->drawable.pScreen;
glamor_priv = glamor_get_screen_private(screen);
source_priv = glamor_get_pixmap_private(source);
temp_fbo = glamor_create_fbo(glamor_priv, w, h, format, 0);
if (temp_fbo == NULL)
return NULL;
glamor_make_current(glamor_priv);
temp_xscale = 1.0 / w;
temp_yscale = 1.0 / h;
glamor_set_normalize_vcoords((struct glamor_pixmap_private *) NULL,
temp_xscale, temp_yscale, 0, 0, w, h,
vertices);
glVertexAttribPointer(GLAMOR_VERTEX_POS, 2, GL_FLOAT, GL_FALSE,
2 * sizeof(float), vertices);
glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
pixmap_priv_get_scale(source_priv, &source_xscale, &source_yscale);
glamor_set_normalize_tcoords(source_priv, source_xscale,
source_yscale,
x, y,
x + w, y + h,
texcoords);
glVertexAttribPointer(GLAMOR_VERTEX_SOURCE, 2, GL_FLOAT, GL_FALSE,
2 * sizeof(float), texcoords);
glEnableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, source_priv->base.fbo->tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glamor_set_destination_pixmap_fbo(temp_fbo, 0, 0, w, h);
glUseProgram(glamor_priv->finish_access_prog[no_alpha]);
glUniform1i(glamor_priv->finish_access_revert[no_alpha], revert);
glUniform1i(glamor_priv->finish_access_swap_rb[no_alpha], swap_rb);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
glDisableVertexAttribArray(GLAMOR_VERTEX_SOURCE);
return temp_fbo;
}
void
glamor_set_destination_pixmap_priv_nc(glamor_pixmap_private *pixmap_priv)
{
int w, h;
PIXMAP_PRIV_GET_ACTUAL_SIZE(pixmap_priv, w, h);
glamor_set_destination_pixmap_fbo(pixmap_priv->base.fbo, 0, 0, w, h);
}
void
glamor_set_destination_drawable(DrawablePtr drawable,
int box_index,
Bool do_drawable_translate,
Bool center_offset,
GLint matrix_uniform_location,
int *p_off_x,
int *p_off_y)
{
ScreenPtr screen = drawable->pScreen;
glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
glamor_pixmap_private *pixmap_priv = glamor_get_pixmap_private(pixmap);
int off_x, off_y;
BoxPtr box = glamor_pixmap_box_at(pixmap_priv, box_index);
int w = box->x2 - box->x1;
int h = box->y2 - box->y1;
float scale_x = 2.0f / (float) w;
float scale_y = 2.0f / (float) h;
float center_adjust = 0.0f;
glamor_get_drawable_deltas(drawable, pixmap, &off_x, &off_y);
off_x -= box->x1;
off_y -= box->y1;
if (p_off_x) {
*p_off_x = off_x;
*p_off_y = off_y;
}
/* A tricky computation to find the right value for the two linear functions
* that transform rendering coordinates to pixmap coordinates
*
* pixmap_x = render_x + drawable->x + off_x
* pixmap_y = render_y + drawable->y + off_y
*
* gl_x = pixmap_x * 2 / width - 1
* gl_y = pixmap_y * 2 / height - 1
*
* gl_x = (render_x + drawable->x + off_x) * 2 / width - 1
*
* gl_x = (render_x) * 2 / width + (drawable->x + off_x) * 2 / width - 1
*/
if (do_drawable_translate) {
off_x += drawable->x;
off_y += drawable->y;
}
/*
* To get GL_POINTS drawn in the right spot, we need to adjust the
* coordinates by 1/2 a pixel.
*/
if (center_offset)
center_adjust = 0.5f;
glUniform4f(matrix_uniform_location,
scale_x, (off_x + center_adjust) * scale_x - 1.0f,
scale_y, (off_y + center_adjust) * scale_y - 1.0f);
glamor_set_destination_pixmap_fbo(glamor_priv, glamor_pixmap_fbo_at(pixmap_priv, box_index),
0, 0, w, h);
}
