/*
 * Copyright 2008 Ben Skeggs
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "pipe/p_screen.h"

#include "nv50_context.h"
#include "nv50_screen.h"

#include "nouveau/nouveau_stateobj.h"

#define NV5X_GRCLASS5097_CHIPSETS 0x00000001
#define NV8X_GRCLASS8297_CHIPSETS 0x00000050
#define NV9X_GRCLASS8297_CHIPSETS 0x00000014

static boolean
nv50_screen_is_format_supported(struct pipe_screen *pscreen,
				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_Z24S8_UNORM:
		case PIPE_FORMAT_Z16_UNORM:
			return TRUE;
		default:
			break;
		}
	} else {
		switch (format) {
		case PIPE_FORMAT_A8R8G8B8_UNORM:
		case PIPE_FORMAT_A1R5G5B5_UNORM:
		case PIPE_FORMAT_A4R4G4B4_UNORM:
		case PIPE_FORMAT_R5G6B5_UNORM:
		case PIPE_FORMAT_L8_UNORM:
		case PIPE_FORMAT_A8_UNORM:
		case PIPE_FORMAT_I8_UNORM:
		case PIPE_FORMAT_A8L8_UNORM:
			return TRUE;
		default:
			break;
		}
	}

	return FALSE;
}

static const char *
nv50_screen_get_name(struct pipe_screen *pscreen)
{
	struct nv50_screen *screen = nv50_screen(pscreen);
	struct nouveau_device *dev = screen->nvws->channel->device;
	static char buffer[128];

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

static const char *
nv50_screen_get_vendor(struct pipe_screen *pscreen)
{
	return "nouveau";
}

static int
nv50_screen_get_param(struct pipe_screen *pscreen, int param)
{
	switch (param) {
	case PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS:
		return 32;
	case PIPE_CAP_NPOT_TEXTURES:
		return 1;
	case PIPE_CAP_TWO_SIDED_STENCIL:
		return 1;
	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 8;
	case PIPE_CAP_OCCLUSION_QUERY:
		return 0;
	case PIPE_CAP_TEXTURE_SHADOW_MAP:
		return 0;
	case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
		return 13;
	case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
		return 10;
	case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
		return 13;
	case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
	case PIPE_CAP_TEXTURE_MIRROR_REPEAT:
		return 1;
	case PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS:
		return 0;
	case NOUVEAU_CAP_HW_VTXBUF:	
		return 1;
	case NOUVEAU_CAP_HW_IDXBUF:	
		return 0;
	default:
		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
		return 0;
	}
}

static float
nv50_screen_get_paramf(struct pipe_screen *pscreen, int param)
{
	switch (param) {
	case PIPE_CAP_MAX_LINE_WIDTH:
	case PIPE_CAP_MAX_LINE_WIDTH_AA:
		return 10.0;
	case PIPE_CAP_MAX_POINT_WIDTH:
	case PIPE_CAP_MAX_POINT_WIDTH_AA:
		return 64.0;
	case PIPE_CAP_MAX_TEXTURE_ANISOTROPY:
		return 16.0;
	case PIPE_CAP_MAX_TEXTURE_LOD_BIAS:
		return 4.0;
	default:
		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
		return 0.0;
	}
}

static void
nv50_screen_destroy(struct pipe_screen *pscreen)
{
	FREE(pscreen);
}

struct pipe_screen *
nv50_screen_create(struct pipe_winsys *ws, struct nouveau_winsys *nvws)
{
	struct nv50_screen *screen = CALLOC_STRUCT(nv50_screen);
	struct nouveau_stateobj *so;
	unsigned tesla_class = 0, ret;
	unsigned chipset = nvws->channel->device->chipset;
	int i;

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

	/* 3D object */
	if ((chipset & 0xf0) != 0x50 && (chipset & 0xf0) != 0x80) {
		NOUVEAU_ERR("Not a G8x chipset\n");
		nv50_screen_destroy(&screen->pipe);
		return NULL;
	}

	switch (chipset & 0xf0) {
	case 0x50:
		if (NV5X_GRCLASS5097_CHIPSETS & (1 << (chipset & 0x0f)))
			tesla_class = 0x5097;
		break;
	case 0x80:
		if (NV8X_GRCLASS8297_CHIPSETS & (1 << (chipset & 0x0f)))
			tesla_class = 0x8297;
		break;
	case 0x90:
		if (NV9X_GRCLASS8297_CHIPSETS & (1 << (chipset & 0x0f)))
			tesla_class = 0x8297;
		break;
	default:
		break;
	}

	if (tesla_class == 0) {
		NOUVEAU_ERR("Unknown G8x chipset: NV%02x\n", chipset);
		nv50_screen_destroy(&screen->pipe);
		return NULL;
	}

	ret = nvws->grobj_alloc(nvws, tesla_class, &screen->tesla);
	if (ret) {
		NOUVEAU_ERR("Error creating 3D object: %d\n", ret);
		nv50_screen_destroy(&screen->pipe);
		return NULL;
	}

	/* Sync notifier */
	ret = nvws->notifier_alloc(nvws, 1, &screen->sync);
	if (ret) {
		NOUVEAU_ERR("Error creating notifier object: %d\n", ret);
		nv50_screen_destroy(&screen->pipe);
		return NULL;
	}

	/* Static tesla init */
	so = so_new(256, 20);

	so_method(so, screen->tesla, 0x1558, 1);
	so_data  (so, 1);
	so_method(so, screen->tesla, NV50TCL_DMA_NOTIFY, 1);
	so_data  (so, screen->sync->handle);
	so_method(so, screen->tesla, NV50TCL_DMA_UNK0(0),
				     NV50TCL_DMA_UNK0__SIZE);
	for (i = 0; i < NV50TCL_DMA_UNK0__SIZE; i++)
		so_data(so, nvws->channel->vram->handle);
	so_method(so, screen->tesla, NV50TCL_DMA_UNK1(0),
				     NV50TCL_DMA_UNK1__SIZE);
	for (i = 0; i < NV50TCL_DMA_UNK1__SIZE; i++)
		so_data(so, nvws->channel->vram->handle);
	so_method(so, screen->tesla, 0x121c, 1);
	so_data  (so, 1);

	so_method(so, screen->tesla, 0x13bc, 1);
	so_data  (so, 0x54);
	so_method(so, screen->tesla, 0x13ac, 1);
	so_data  (so, 1);
	so_method(so, screen->tesla, 0x16b8, 1);
	so_data  (so, 8);

	/* Shared constant buffer */
	screen->constbuf = ws->buffer_create(ws, 0, 0, 128 * 4 * 4);
	if (nvws->res_init(&screen->vp_data_heap, 0, 128)) {
		NOUVEAU_ERR("Error initialising constant buffer\n");
		nv50_screen_destroy(&screen->pipe);
		return NULL;
	}

	so_method(so, screen->tesla, 0x1280, 3);
	so_reloc (so, screen->constbuf, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_HIGH, 0, 0);
	so_reloc (so, screen->constbuf, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_LOW, 0, 0);
	so_data  (so, (NV50_CB_PMISC << 16) | 0x00001000);

	/* Texture sampler/image unit setup - we abuse the constant buffer
	 * upload mechanism for the moment to upload data to the tex config
	 * blocks.  At some point we *may* want to go the NVIDIA way of doing
	 * things?
	 */
	screen->tic = ws->buffer_create(ws, 0, 0, 32 * 8 * 4);
	so_method(so, screen->tesla, 0x1280, 3);
	so_reloc (so, screen->tic, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_HIGH, 0, 0);
	so_reloc (so, screen->tic, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_LOW, 0, 0);
	so_data  (so, (NV50_CB_TIC << 16) | 0x0800);
	so_method(so, screen->tesla, 0x1574, 3);
	so_reloc (so, screen->tic, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_HIGH, 0, 0);
	so_reloc (so, screen->tic, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_LOW, 0, 0);
	so_data  (so, 0x00000800);

	screen->tsc = ws->buffer_create(ws, 0, 0, 32 * 8 * 4);
	so_method(so, screen->tesla, 0x1280, 3);
	so_reloc (so, screen->tsc, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_HIGH, 0, 0);
	so_reloc (so, screen->tsc, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_LOW, 0, 0);
	so_data  (so, (NV50_CB_TSC << 16) | 0x0800);
	so_method(so, screen->tesla, 0x155c, 3);
	so_reloc (so, screen->tsc, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_HIGH, 0, 0);
	so_reloc (so, screen->tsc, 0, NOUVEAU_BO_VRAM |
		  NOUVEAU_BO_RD | NOUVEAU_BO_LOW, 0, 0);
	so_data  (so, 0x00000800);


	/* Vertex array limits - max them out */
	for (i = 0; i < 16; i++) {
		so_method(so, screen->tesla, 0x1080 + (i * 8), 2);
		so_data  (so, 0x000000ff);
		so_data  (so, 0xffffffff);
	}

	so_method(so, screen->tesla, NV50TCL_DEPTH_RANGE_NEAR, 2);
	so_data  (so, fui(0.0));
	so_data  (so, fui(1.0));

	so_method(so, screen->tesla, 0x1234, 1);
	so_data  (so, 1);
	so_method(so, screen->tesla, 0x1458, 1);
	so_data  (so, 1);

	so_emit(nvws, so);
	so_ref(so, &screen->static_init);
	nvws->push_flush(nvws, 0, NULL);

	screen->pipe.winsys = ws;

	screen->pipe.destroy = nv50_screen_destroy;

	screen->pipe.get_name = nv50_screen_get_name;
	screen->pipe.get_vendor = nv50_screen_get_vendor;
	screen->pipe.get_param = nv50_screen_get_param;
	screen->pipe.get_paramf = nv50_screen_get_paramf;

	screen->pipe.is_format_supported = nv50_screen_is_format_supported;

	nv50_screen_init_miptree_functions(&screen->pipe);
	nv50_surface_init_screen_functions(&screen->pipe);

	return &screen->pipe;
}