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/*
* gxr
* Copyright 2018 Collabora Ltd.
* Author: Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
* SPDX-License-Identifier: MIT
*/
#include "scene-background.h"
#include <gulkan.h>
#include "graphene-ext.h"
typedef struct __attribute__((__packed__)) {
float mvp[16];
} SceneBackgroundUniformBuffer;
struct _SceneBackground
{
SceneObject parent;
GulkanVertexBuffer *vertex_buffer;
};
G_DEFINE_TYPE (SceneBackground, scene_background, SCENE_TYPE_OBJECT)
static void
scene_background_finalize (GObject *gobject);
static void
scene_background_class_init (SceneBackgroundClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = scene_background_finalize;
}
static void
scene_background_init (SceneBackground *self)
{
self->vertex_buffer = gulkan_vertex_buffer_new ();
}
static gboolean
_initialize (SceneBackground *self,
GulkanClient *gulkan,
VkDescriptorSetLayout *layout);
SceneBackground *
scene_background_new (GulkanClient *gulkan,
VkDescriptorSetLayout *layout)
{
SceneBackground *self =
(SceneBackground*) g_object_new (SCENE_TYPE_BACKGROUND, 0);
_initialize (self, gulkan, layout);
return self;
}
static void
scene_background_finalize (GObject *gobject)
{
SceneBackground *self = SCENE_BACKGROUND (gobject);
g_clear_object (&self->vertex_buffer);
G_OBJECT_CLASS (scene_background_parent_class)->finalize (gobject);
}
static void
_append_star (GulkanVertexBuffer *self,
float radius,
float y,
uint32_t sections,
graphene_vec3_t *color)
{
graphene_vec4_t *points = g_malloc (sizeof(graphene_vec4_t) * sections);
graphene_vec4_init (&points[0], radius, y, 0, 1);
graphene_vec4_init (&points[1], -radius, y, 0, 1);
graphene_matrix_t rotation;
graphene_matrix_init_identity (&rotation);
graphene_matrix_rotate_y (&rotation, 360.0f / (float) sections);
for (uint32_t i = 0; i < sections / 2 - 1; i++)
{
uint32_t j = i * 2;
graphene_matrix_transform_vec4 (&rotation, &points[j], &points[j + 2]);
graphene_matrix_transform_vec4 (&rotation, &points[j + 1], &points[j + 3]);
}
for (uint32_t i = 0; i < sections; i++)
gulkan_vertex_buffer_append_with_color (self, &points[i], color);
g_free (points);
}
static void
_append_circle (GulkanVertexBuffer *self,
float radius,
float y,
uint32_t edges,
graphene_vec3_t *color)
{
graphene_vec4_t *points = g_malloc (sizeof(graphene_vec4_t) * edges * 2);
graphene_vec4_init (&points[0], radius, y, 0, 1);
graphene_matrix_t rotation;
graphene_matrix_init_identity (&rotation);
graphene_matrix_rotate_y (&rotation, 360.0f / (float) edges);
for (uint32_t i = 0; i < edges; i++)
{
uint32_t j = i * 2;
if (i != 0)
graphene_vec4_init_from_vec4 (&points[j], &points[j - 1]);
graphene_matrix_transform_vec4 (&rotation, &points[j], &points[j + 1]);
}
for (uint32_t i = 0; i < edges * 2; i++)
gulkan_vertex_buffer_append_with_color (self, &points[i], color);
g_free(points);
}
static void
_append_floor (GulkanVertexBuffer *self,
uint32_t radius,
float y,
graphene_vec3_t *color)
{
_append_star (self, (float) radius, y, 8, color);
for (uint32_t i = 1; i <= radius; i++)
_append_circle (self, (float) i, y, 128, color);
}
static gboolean
_initialize (SceneBackground *self,
GulkanClient *gulkan,
VkDescriptorSetLayout *layout)
{
gulkan_vertex_buffer_reset (self->vertex_buffer);
graphene_vec3_t color;
graphene_vec3_init (&color, .6f, .6f, .6f);
_append_floor (self->vertex_buffer, 20, 0.0f, &color);
_append_floor (self->vertex_buffer, 20, 4.0f, &color);
GulkanDevice *device = gulkan_client_get_device (gulkan);
if (!gulkan_vertex_buffer_alloc_empty (self->vertex_buffer, device,
GXR_DEVICE_INDEX_MAX))
return FALSE;
gulkan_vertex_buffer_map_array (self->vertex_buffer);
SceneObject *obj = SCENE_OBJECT (self);
VkDeviceSize ub_size = sizeof (SceneBackgroundUniformBuffer);
if (!scene_object_initialize (obj, gulkan, layout, ub_size))
return FALSE;
scene_object_update_descriptors (obj);
return TRUE;
}
static void
_update_ubo (SceneBackground *self,
GxrEye eye,
graphene_matrix_t *vp)
{
SceneBackgroundUniformBuffer ub;
graphene_matrix_t m_matrix;
scene_object_get_transformation (SCENE_OBJECT (self), &m_matrix);
graphene_matrix_t mvp_matrix;
graphene_matrix_multiply (&m_matrix, vp, &mvp_matrix);
float mvp[16];
graphene_matrix_to_float (&mvp_matrix, mvp);
for (int i = 0; i < 16; i++)
ub.mvp[i] = mvp[i];
scene_object_update_ubo (SCENE_OBJECT (self), eye, &ub);
}
void
scene_background_render (SceneBackground *self,
GxrEye eye,
VkPipeline pipeline,
VkPipelineLayout pipeline_layout,
VkCommandBuffer cmd_buffer,
graphene_matrix_t *vp)
{
if (!gulkan_vertex_buffer_is_initialized (self->vertex_buffer))
return;
SceneObject *obj = SCENE_OBJECT (self);
if (!scene_object_is_visible (obj))
return;
vkCmdBindPipeline (cmd_buffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline);
_update_ubo (self, eye, vp);
scene_object_bind (obj, eye, cmd_buffer, pipeline_layout);
gulkan_vertex_buffer_draw (self->vertex_buffer, cmd_buffer);
}
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