/*
 * Copyright (C) 2009 Francisco Jerez.
 * All Rights Reserved.
 *
 * 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 (including the
 * next paragraph) 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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 <stdio.h>
#include "main/mtypes.h"
#include "main/fbobject.h"

#include "nouveau_driver.h"
#include "nouveau_context.h"
#include "nouveau_fbo.h"
#include "nouveau_util.h"

#include "drivers/common/meta.h"

const char * const nouveau_vendor_string = "Nouveau";

const char *
nouveau_get_renderer_string(unsigned chipset)
{
	char hardware_name[32];
	static char buffer[128];

	snprintf(hardware_name, sizeof(hardware_name), "nv%02X", chipset);
	driGetRendererString(buffer, hardware_name, 0);

	return buffer;
}

static const GLubyte *
nouveau_get_string(struct gl_context *ctx, GLenum name)
{
	switch (name) {
		case GL_VENDOR:
			return (GLubyte *)nouveau_vendor_string;

		case GL_RENDERER:
			return (GLubyte *)nouveau_get_renderer_string(context_chipset(ctx));
		default:
			return NULL;
	}
}

static void
nouveau_flush(struct gl_context *ctx)
{
	struct nouveau_context *nctx = to_nouveau_context(ctx);
	struct nouveau_pushbuf *push = context_push(ctx);

	PUSH_KICK(push);

	if (_mesa_is_winsys_fbo(ctx->DrawBuffer) &&
	    ctx->DrawBuffer->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
		__DRIscreen *screen = nctx->screen->dri_screen;
		const __DRIdri2LoaderExtension *dri2 = screen->dri2.loader;
		__DRIdrawable *drawable = nctx->dri_context->driDrawablePriv;

		if (drawable && drawable->loaderPrivate)
			dri2->flushFrontBuffer(drawable, drawable->loaderPrivate);
	}
}

static void
nouveau_finish(struct gl_context *ctx)
{
	struct nouveau_context *nctx = to_nouveau_context(ctx);
	struct nouveau_pushbuf *push = context_push(ctx);
	struct nouveau_pushbuf_refn refn =
		{ nctx->fence, NOUVEAU_BO_VRAM | NOUVEAU_BO_RDWR };

	nouveau_flush(ctx);

	if (!nouveau_pushbuf_space(push, 16, 0, 0) &&
	    !nouveau_pushbuf_refn(push, &refn, 1)) {
		PUSH_DATA(push, 0);
		PUSH_KICK(push);
	}

	nouveau_bo_wait(nctx->fence, NOUVEAU_BO_RDWR, context_client(ctx));
}

void
nouveau_clear(struct gl_context *ctx, GLbitfield buffers)
{
	struct gl_framebuffer *fb = ctx->DrawBuffer;
	int x, y, w, h;
	int i, buf;

	nouveau_validate_framebuffer(ctx);
	get_scissors(fb, &x, &y, &w, &h);

	for (i = 0; i < BUFFER_COUNT; i++) {
		struct nouveau_surface *s;
		unsigned mask, value;

		buf = buffers & (1 << i);
		if (!buf)
			continue;

		s = &to_nouveau_renderbuffer(
			fb->Attachment[i].Renderbuffer)->surface;

		if (buf & BUFFER_BITS_COLOR) {
			const float *color = ctx->Color.ClearColor.f;

			if (fb->Attachment[i].Renderbuffer->_BaseFormat ==
			    GL_LUMINANCE_ALPHA)
				value = pack_la_clamp_f(
						s->format, color[0], color[3]);
			else
				value = pack_rgba_clamp_f(s->format, color);

			const uint8_t colormask[4] = {
				GET_COLORMASK_BIT(ctx->Color.ColorMask, 0, 0) ? 0xff : 0,
				GET_COLORMASK_BIT(ctx->Color.ColorMask, 0, 1) ? 0xff : 0,
				GET_COLORMASK_BIT(ctx->Color.ColorMask, 0, 2) ? 0xff : 0,
				GET_COLORMASK_BIT(ctx->Color.ColorMask, 0, 3) ? 0xff : 0,
			};
			mask = pack_rgba_i(s->format, colormask);

			if (mask)
				context_drv(ctx)->surface_fill(
					ctx, s, mask, value, x, y, w, h);

			buffers &= ~buf;

		} else if (buf & (BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL)) {
			mask = pack_zs_i(s->format,
					 (buffers & BUFFER_BIT_DEPTH &&
					  ctx->Depth.Mask) ? ~0 : 0,
					 (buffers & BUFFER_BIT_STENCIL ?
					  ctx->Stencil.WriteMask[0] : 0));
			value = pack_zs_f(s->format,
					  ctx->Depth.Clear,
					  ctx->Stencil.Clear);

			if (mask)
				context_drv(ctx)->surface_fill(
					ctx, s, mask, value, x, y, w, h);

			buffers &= ~(BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
		}
	}

	if (buffers)
		_mesa_meta_Clear(ctx, buffers);
}

void
nouveau_driver_functions_init(struct dd_function_table *functions)
{
	functions->GetString = nouveau_get_string;
	functions->Flush = nouveau_flush;
	functions->Finish = nouveau_finish;
	functions->Clear = nouveau_clear;
	functions->DrawPixels = _mesa_meta_DrawPixels;
	functions->CopyPixels = _mesa_meta_CopyPixels;
	functions->Bitmap = _mesa_meta_Bitmap;
	functions->BlitFramebuffer = _mesa_meta_and_swrast_BlitFramebuffer;
}
