#include "config.h"

#include "gskgpuboxshadowopprivate.h"

#include "gskgpuframeprivate.h"
#include "gskgpuprintprivate.h"
#include "gskgpushaderopprivate.h"
#include "gskrectprivate.h"
#include "gsk/gskroundedrectprivate.h"

#include "gpu/shaders/gskgpuboxshadowinstance.h"

#define VARIATION_INSET 1

typedef struct _GskGpuBoxShadowOp GskGpuBoxShadowOp;

struct _GskGpuBoxShadowOp
{
  GskGpuShaderOp op;
};

static void
gsk_gpu_box_shadow_op_print_instance (GskGpuShaderOp *shader,
                                      gpointer        instance_,
                                      GString        *string)
{
  GskGpuBoxshadowInstance *instance = (GskGpuBoxshadowInstance *) instance_;

  gsk_gpu_print_rounded_rect (string, instance->outline);
  gsk_gpu_print_rgba (string, instance->color);
  g_string_append_printf (string, "%g %g %g %g ",
                          instance->shadow_offset[0], instance->shadow_offset[1],
                          instance->blur_radius, instance->shadow_spread);
}

#ifdef GDK_RENDERING_VULKAN
static GskGpuOp *
gsk_gpu_box_shadow_op_vk_command (GskGpuOp              *op,
                                  GskGpuFrame           *frame,
                                  GskVulkanCommandState *state)
{
  return gsk_gpu_shader_op_vk_command_n (op, frame, state, 8);
}
#endif

static GskGpuOp *
gsk_gpu_box_shadow_op_gl_command (GskGpuOp          *op,
                                  GskGpuFrame       *frame,
                                  GskGLCommandState *state)
{
  return gsk_gpu_shader_op_gl_command_n (op, frame, state, 8);
}

static const GskGpuShaderOpClass GSK_GPU_BOX_SHADOW_OP_CLASS = {
  {
    GSK_GPU_OP_SIZE (GskGpuBoxShadowOp),
    GSK_GPU_STAGE_SHADER,
    gsk_gpu_shader_op_finish,
    gsk_gpu_shader_op_print,
#ifdef GDK_RENDERING_VULKAN
    gsk_gpu_box_shadow_op_vk_command,
#endif
    gsk_gpu_box_shadow_op_gl_command
  },
  "gskgpuboxshadow",
  gsk_gpu_boxshadow_n_textures,
  sizeof (GskGpuBoxshadowInstance),
#ifdef GDK_RENDERING_VULKAN
  &gsk_gpu_boxshadow_info,
#endif
  gsk_gpu_box_shadow_op_print_instance,
  gsk_gpu_boxshadow_setup_attrib_locations,
  gsk_gpu_boxshadow_setup_vao
};

void
gsk_gpu_box_shadow_op (GskGpuFrame            *frame,
                       GskGpuShaderClip        clip,
                       GdkColorState          *ccs,
                       float                   opacity,
                       const graphene_point_t *offset,
                       gboolean                inset,
                       const graphene_rect_t  *bounds,
                       const GskRoundedRect   *outline,
                       const graphene_point_t *shadow_offset,
                       float                   spread,
                       float                   blur_radius,
                       const GdkColor         *color)
{
  GskGpuBoxshadowInstance *instance;
  GdkColorState *alt;

  /* Use border shader for no blurring */
  g_return_if_fail (blur_radius > 0.0f);

  alt = gsk_gpu_color_states_find (ccs, color);

  gsk_gpu_shader_op_alloc (frame,
                           &GSK_GPU_BOX_SHADOW_OP_CLASS,
                           gsk_gpu_color_states_create (ccs, TRUE, alt, FALSE),
                           inset ? VARIATION_INSET : 0,
                           clip,
                           NULL,
                           NULL,
                           &instance);

  gsk_gpu_rect_to_float (bounds, offset, instance->bounds);
  gsk_rounded_rect_to_float (outline, offset, instance->outline);
  gsk_gpu_color_to_float (color, alt, opacity, instance->color);
  instance->shadow_offset[0] = shadow_offset->x;
  instance->shadow_offset[1] = shadow_offset->y;
  instance->shadow_spread = spread;
  instance->blur_radius = blur_radius;
}

