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/*
* gulkan
* Copyright 2020 Collabora Ltd.
* Author: Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
* SPDX-License-Identifier: MIT
*/
#define _GNU_SOURCE
#include <math.h>
#include <cairo.h>
#include "common/plane-example.h"
struct _Example
{
PlaneExample parent;
};
G_DEFINE_TYPE (Example, gulkan_example, PLANE_TYPE_EXAMPLE)
static void
gulkan_example_init (Example *self)
{
(void) self;
}
static void
draw_gradient_quad (cairo_t *cr, double w, double h)
{
cairo_pattern_t *pat = cairo_pattern_create_linear (0.0, 0.0, 0.0, h);
cairo_pattern_add_color_stop_rgba (pat, 1, 0, 0, 0, 1);
cairo_pattern_add_color_stop_rgba (pat, 0, 1, 1, 1, 1);
cairo_rectangle (cr, 0, 0, w, h);
cairo_set_source (cr, pat);
cairo_fill (cr);
cairo_pattern_destroy (pat);
}
static void
draw_gradient_circle (cairo_t *cr, double w, double h)
{
double r0;
if (w < h)
r0 = w / 10.0;
else
r0 = h / 10.0;
double radius = r0 * 3.0;
double r1 = r0 * 5.0;
double center_x = w / 2.0;
double center_y = h / 2.0;
double cx0 = center_x - r0 / 2.0;
double cy0 = center_y - r0;
double cx1 = center_x - r0;
double cy1 = center_y - r0;
cairo_pattern_t *pat = cairo_pattern_create_radial (cx0, cy0, r0,
cx1, cy1, r1);
cairo_pattern_add_color_stop_rgba (pat, 0, 1, 1, 1, 1);
cairo_pattern_add_color_stop_rgba (pat, 1, 0, 0, 0, 1);
cairo_set_source (cr, pat);
cairo_arc (cr, center_x, center_y, radius, 0, 2 * M_PI);
cairo_fill (cr);
cairo_pattern_destroy (pat);
cairo_select_font_face (cr, "Sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size (cr, 52.0);
cairo_text_extents_t extents;
cairo_text_extents (cr, "R", &extents);
cairo_move_to (cr, center_x, center_y);
cairo_set_source_rgb (cr, 0.8, 0.3, 0.3);
cairo_show_text (cr, "R");
double x_offset = extents.width;
cairo_move_to (cr, center_x + x_offset, center_y);
cairo_set_source_rgb (cr, 0.3, 0.8, 0.3);
cairo_show_text (cr, "G");
cairo_text_extents (cr, "G", &extents);
x_offset += extents.width;
cairo_move_to (cr, center_x + x_offset, center_y);
cairo_set_source_rgb (cr, 0.3, 0.3, 0.8);
cairo_show_text (cr, "B");
}
static void
draw_cairo (cairo_t *cr, double w, double h)
{
draw_gradient_quad (cr, w, h);
draw_gradient_circle (cr, w, h);
}
static cairo_surface_t*
create_cairo_surface (unsigned char *image, int w, int h)
{
cairo_surface_t *surface =
cairo_image_surface_create_for_data (image,
CAIRO_FORMAT_ARGB32,
w, h,
w * 4);
cairo_t *cr = cairo_create (surface);
cairo_rectangle (cr, 0, 0, w, h);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_fill (cr);
draw_cairo (cr, w, h);
cairo_destroy (cr);
return surface;
}
static GulkanTexture*
_init_texture (PlaneExample *example,
GulkanClient *client,
GdkPixbuf *pixbuf)
{
(void) pixbuf;
(void) example;
int w = gdk_pixbuf_get_width (pixbuf);
int h = gdk_pixbuf_get_height (pixbuf);
unsigned char * image =
g_malloc (sizeof(unsigned char) * (unsigned long) (w * h) * 4);
cairo_surface_t* surface = create_cairo_surface (image, w, h);
if (surface == NULL) {
fprintf (stderr, "Could not create cairo surface.\n");
return NULL;
}
GulkanTexture *texture =
gulkan_texture_new_from_cairo_surface (client, surface,
VK_FORMAT_R8G8B8A8_SRGB,
VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
g_free (image);
return texture;
}
static void
gulkan_example_class_init (ExampleClass *klass)
{
PlaneExampleClass *parent_class = PLANE_EXAMPLE_CLASS (klass);
parent_class->init_texture = _init_texture;
}
int
main () {
Example *self = (Example *) g_object_new (GULKAN_TYPE_EXAMPLE, 0);
if (!plane_example_initialize (PLANE_EXAMPLE (self),
"/res/cat_srgb.jpg",
NULL, NULL))
return EXIT_FAILURE;
plane_example_run (PLANE_EXAMPLE (self));
g_object_unref (self);
return EXIT_SUCCESS;
}
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