#include "pipe/p_screen.h"
#include "pipe/p_inlines.h"
#include "util/u_simple_screen.h"

#include "nv04_context.h"
#include "nv04_screen.h"

static const char *
nv04_screen_get_name(struct pipe_screen *screen)
{
	struct nv04_screen *nv04screen = nv04_screen(screen);
	struct nouveau_device *dev = nv04screen->nvws->channel->device;
	static char buffer[128];

	snprintf(buffer, sizeof(buffer), "NV%02X", dev->chipset);
	return buffer;
}

static const char *
nv04_screen_get_vendor(struct pipe_screen *screen)
{
	return "nouveau";
}

static int
nv04_screen_get_param(struct pipe_screen *screen, int param)
{
	switch (param) {
	case PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS:
		return 1;
	case PIPE_CAP_NPOT_TEXTURES:
		return 0;
	case PIPE_CAP_TWO_SIDED_STENCIL:
		return 0;
	case PIPE_CAP_GLSL:
		return 0;
	case PIPE_CAP_S3TC:
		return 0;
	case PIPE_CAP_ANISOTROPIC_FILTER:
		return 0;
	case PIPE_CAP_POINT_SPRITE:
		return 0;
	case PIPE_CAP_MAX_RENDER_TARGETS:
		return 1;
	case PIPE_CAP_OCCLUSION_QUERY:
		return 0;
	case PIPE_CAP_TEXTURE_SHADOW_MAP:
		return 0;
	case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
		return 10;
	case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
		return 0;
	case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
		return 0;
	case PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS:
		return 0;
	case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
		return 0;
	case PIPE_CAP_TEXTURE_MIRROR_REPEAT:
		return 1;
	case NOUVEAU_CAP_HW_VTXBUF:
	case NOUVEAU_CAP_HW_IDXBUF:
		return 0;
	default:
		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
		return 0;
	}
}

static float
nv04_screen_get_paramf(struct pipe_screen *screen, int param)
{
	switch (param) {
	case PIPE_CAP_MAX_LINE_WIDTH:
	case PIPE_CAP_MAX_LINE_WIDTH_AA:
		return 0.0;
	case PIPE_CAP_MAX_POINT_WIDTH:
	case PIPE_CAP_MAX_POINT_WIDTH_AA:
		return 0.0;
	case PIPE_CAP_MAX_TEXTURE_ANISOTROPY:
		return 0.0;
	case PIPE_CAP_MAX_TEXTURE_LOD_BIAS:
		return 0.0;
	default:
		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
		return 0.0;
	}
}

static boolean
nv04_screen_is_format_supported(struct pipe_screen *screen,
				enum pipe_format format,
				enum pipe_texture_target target,
				unsigned tex_usage, unsigned geom_flags)
{
	if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET) {
		switch (format) {
		case PIPE_FORMAT_A8R8G8B8_UNORM:
		case PIPE_FORMAT_R5G6B5_UNORM: 
		case PIPE_FORMAT_Z16_UNORM:
			return TRUE;
		default:
			break;
		}
	} else {
		switch (format) {
		case PIPE_FORMAT_A8R8G8B8_UNORM:
		case PIPE_FORMAT_X8R8G8B8_UNORM:
		case PIPE_FORMAT_A1R5G5B5_UNORM:
		case PIPE_FORMAT_R5G6B5_UNORM: 
		case PIPE_FORMAT_L8_UNORM:
		case PIPE_FORMAT_A8_UNORM:
			return TRUE;
		default:
			break;
		}
	}

	return FALSE;
}

static void
nv04_screen_destroy(struct pipe_screen *pscreen)
{
	struct nv04_screen *screen = nv04_screen(pscreen);
	struct nouveau_winsys *nvws = screen->nvws;

	nvws->notifier_free(&screen->sync);
	nvws->grobj_free(&screen->fahrenheit);
	nv04_surface_2d_takedown(&screen->eng2d);

	FREE(pscreen);
}

static struct pipe_buffer *
nv04_surface_buffer(struct pipe_surface *surf)
{
	struct nv04_miptree *mt = (struct nv04_miptree *)surf->texture;

	return mt->buffer;
}

struct pipe_screen *
nv04_screen_create(struct pipe_winsys *ws, struct nouveau_winsys *nvws)
{
	struct nv04_screen *screen = CALLOC_STRUCT(nv04_screen);
	unsigned fahrenheit_class = 0, sub3d_class = 0;
	unsigned chipset = nvws->channel->device->chipset;
	int ret;

	if (!screen)
		return NULL;
	screen->nvws = nvws;

	if (chipset>=0x20) {
		fahrenheit_class = 0;
		sub3d_class = 0;
	} else if (chipset>=0x10) {
		fahrenheit_class = NV10_DX5_TEXTURED_TRIANGLE;
		sub3d_class = NV10_CONTEXT_SURFACES_3D;
	} else {
		fahrenheit_class=NV04_DX5_TEXTURED_TRIANGLE;
		sub3d_class = NV04_CONTEXT_SURFACES_3D;
	}

	if (!fahrenheit_class) {
		NOUVEAU_ERR("Unknown nv04 chipset: nv%02x\n", chipset);
		return NULL;
	}

	/* 2D engine setup */
	screen->eng2d = nv04_surface_2d_init(nvws);
	screen->eng2d->buf = nv04_surface_buffer;

	/* 3D object */
	ret = nvws->grobj_alloc(nvws, fahrenheit_class, &screen->fahrenheit);
	if (ret) {
		NOUVEAU_ERR("Error creating 3D object: %d\n", ret);
		return NULL;
	}

	/* 3D surface object */
	ret = nvws->grobj_alloc(nvws, sub3d_class, &screen->context_surfaces_3d);
	if (ret) {
		NOUVEAU_ERR("Error creating 3D surface object: %d\n", ret);
		return NULL;
	}

	/* Notifier for sync purposes */
	ret = nvws->notifier_alloc(nvws, 1, &screen->sync);
	if (ret) {
		NOUVEAU_ERR("Error creating notifier object: %d\n", ret);
		nv04_screen_destroy(&screen->pipe);
		return NULL;
	}

	screen->pipe.winsys = ws;
	screen->pipe.destroy = nv04_screen_destroy;

	screen->pipe.get_name = nv04_screen_get_name;
	screen->pipe.get_vendor = nv04_screen_get_vendor;
	screen->pipe.get_param = nv04_screen_get_param;
	screen->pipe.get_paramf = nv04_screen_get_paramf;

	screen->pipe.is_format_supported = nv04_screen_is_format_supported;

	nv04_screen_init_miptree_functions(&screen->pipe);
	nv04_screen_init_transfer_functions(&screen->pipe);
	u_simple_screen_init(&screen->pipe);

	return &screen->pipe;
}