swrast.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

	xrb->Base.DataType = GL_UNSIGNED_BYTE;
	xrb->Base.RedBits   = 8 * sizeof(GLubyte);
	xrb->Base.GreenBits = 8 * sizeof(GLubyte);
	xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
	xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
	break;
    case PF_R5G6B5:
	xrb->Base.InternalFormat = GL_RGB;
	xrb->Base._BaseFormat = GL_RGB;
	xrb->Base.DataType = GL_UNSIGNED_BYTE;
	xrb->Base.RedBits   = 5 * sizeof(GLubyte);
	xrb->Base.GreenBits = 6 * sizeof(GLubyte);
	xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
	xrb->Base.AlphaBits = 0;
	break;
    case PF_R3G3B2:
	xrb->Base.InternalFormat = GL_RGB;
	xrb->Base._BaseFormat = GL_RGB;
	xrb->Base.DataType = GL_UNSIGNED_BYTE;
	xrb->Base.RedBits   = 3 * sizeof(GLubyte);
	xrb->Base.GreenBits = 3 * sizeof(GLubyte);
	xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
	xrb->Base.AlphaBits = 0;
	break;
    case PF_CI8:
	xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
	xrb->Base._BaseFormat = GL_COLOR_INDEX;
	xrb->Base.DataType = GL_UNSIGNED_BYTE;
	xrb->Base.IndexBits = 8 * sizeof(GLubyte);
	break;
    default:
	return NULL;
    }

    return xrb;
}

static __DRIdrawable *
driCreateNewDrawable(__DRIscreen *screen,
		     const __DRIconfig *config, void *data)
{
    __DRIdrawable *buf;
    struct swrast_renderbuffer *frontrb, *backrb;

    TRACE;

    buf = _mesa_calloc(sizeof *buf);
    if (!buf)
	return NULL;

    buf->loaderPrivate = data;

    buf->driScreenPriv = screen;

    buf->row = _mesa_malloc(MAX_WIDTH * 4);

    /* basic framebuffer setup */
    _mesa_initialize_framebuffer(&buf->Base, &config->modes);

    /* add front renderbuffer */
    frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
    _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);

    /* add back renderbuffer */
    if (config->modes.doubleBufferMode) {
	backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
	_mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
    }

    /* add software renderbuffers */
    _mesa_add_soft_renderbuffers(&buf->Base,
				 GL_FALSE, /* color */
				 config->modes.haveDepthBuffer,
				 config->modes.haveStencilBuffer,
				 config->modes.haveAccumBuffer,
				 GL_FALSE, /* alpha */
				 GL_FALSE /* aux bufs */);

    return buf;
}

static void
driDestroyDrawable(__DRIdrawable *buf)
{
    TRACE;

    if (buf) {
	struct gl_framebuffer *fb = &buf->Base;

	_mesa_free(buf->row);

	fb->DeletePending = GL_TRUE;
	_mesa_unreference_framebuffer(&fb);
    }
}

static void driSwapBuffers(__DRIdrawable *buf)
{
    GET_CURRENT_CONTEXT(ctx);

    struct swrast_renderbuffer *frontrb =
	swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
    struct swrast_renderbuffer *backrb =
	swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);

    __DRIscreen *screen = buf->driScreenPriv;

    TRACE;

    /* check for signle-buffered */
    if (backrb == NULL)
	return;

    /* check if swapping currently bound buffer */
    if (ctx && ctx->DrawBuffer == &(buf->Base)) {
	/* flush pending rendering */
	_mesa_notifySwapBuffers(ctx);
    }

    screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
				    0, 0,
				    frontrb->Base.Width,
				    frontrb->Base.Height,
				    backrb->Base.Data,
				    buf->loaderPrivate);
}


/**
 * General device driver functions.
 */

static void
get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
{
    __DRIdrawable *buf = swrast_drawable(fb);
    __DRIscreen *screen = buf->driScreenPriv;
    int x, y;

    screen->swrast_loader->getDrawableInfo(buf,
					   &x, &y, w, h,
					   buf->loaderPrivate);
}

static void
swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
{
    GLsizei width, height;

    get_window_size(fb, &width, &height);
    if (fb->Width != width || fb->Height != height) {
	_mesa_resize_framebuffer(ctx, fb, width, height);
    }
}

static const GLubyte *
get_string(GLcontext *ctx, GLenum pname)
{
    (void) ctx;
    switch (pname) {
	case GL_VENDOR:
	    return (const GLubyte *) "Mesa Project";
	case GL_RENDERER:
	    return (const GLubyte *) "Software Rasterizer";
	default:
	    return NULL;
    }
}

static void
update_state( GLcontext *ctx, GLuint new_state )
{
    /* not much to do here - pass it on */
    _swrast_InvalidateState( ctx, new_state );
    _swsetup_InvalidateState( ctx, new_state );
    _vbo_InvalidateState( ctx, new_state );
    _tnl_InvalidateState( ctx, new_state );
}

static void
viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
{
    GLframebuffer *draw = ctx->WinSysDrawBuffer;
    GLframebuffer *read = ctx->WinSysReadBuffer;

    swrast_check_and_update_window_size(ctx, draw);
    swrast_check_and_update_window_size(ctx, read);
}

static void
swrast_init_driver_functions(struct dd_function_table *driver)
{
    driver->GetString = get_string;
    driver->UpdateState = update_state;
    driver->GetBufferSize = NULL;
    driver->Viewport = viewport;
}


/**
 * Context-related functions.
 */

static __DRIcontext *
driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
		    __DRIcontext *shared, void *data)
{
    __DRIcontext *ctx;
    GLcontext *mesaCtx;
    struct dd_function_table functions;

    TRACE;

    ctx = _mesa_calloc(sizeof *ctx);
    if (!ctx)
	return NULL;

    ctx->loaderPrivate = data;

    ctx->driScreenPriv = screen;

    /* build table of device driver functions */
    _mesa_init_driver_functions(&functions);
    swrast_init_driver_functions(&functions);

    if (!_mesa_initialize_context(&ctx->Base, &config->modes,
				  shared ? &shared->Base : NULL,
				  &functions, (void *) ctx)) {
      _mesa_free(ctx);
      return NULL;
    }

    mesaCtx = &ctx->Base;

    /* do bounds checking to prevent segfaults and server crashes! */
    mesaCtx->Const.CheckArrayBounds = GL_TRUE;

    /* create module contexts */
    _swrast_CreateContext( mesaCtx );
    _vbo_CreateContext( mesaCtx );
    _tnl_CreateContext( mesaCtx );
    _swsetup_CreateContext( mesaCtx );
    _swsetup_Wakeup( mesaCtx );

    /* use default TCL pipeline */
    {
       TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
       tnl->Driver.RunPipeline = _tnl_run_pipeline;
    }

    _mesa_enable_sw_extensions(mesaCtx);
    _mesa_enable_1_3_extensions(mesaCtx);
    _mesa_enable_1_4_extensions(mesaCtx);
    _mesa_enable_1_5_extensions(mesaCtx);
    _mesa_enable_2_0_extensions(mesaCtx);
    _mesa_enable_2_1_extensions(mesaCtx);

    return ctx;
}

static void
driDestroyContext(__DRIcontext *ctx)
{
    GLcontext *mesaCtx;
    TRACE;

    if (ctx) {
	mesaCtx = &ctx->Base;
	_swsetup_DestroyContext( mesaCtx );
	_swrast_DestroyContext( mesaCtx );
	_tnl_DestroyContext( mesaCtx );
	_vbo_DestroyContext( mesaCtx );
	_mesa_destroy_context( mesaCtx );
    }
}

static int
driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
{
    TRACE;

    _mesa_copy_context(&src->Base, &dst->Base, mask);
    return GL_TRUE;
}

static int driBindContext(__DRIcontext *ctx,
			  __DRIdrawable *draw,
			  __DRIdrawable *read)
{
    GLcontext *mesaCtx;
    GLframebuffer *mesaDraw;
    GLframebuffer *mesaRead;
    TRACE;

    if (ctx) {
	if (!draw || !read)
	    return GL_FALSE;

	mesaCtx = &ctx->Base;
	mesaDraw = &draw->Base;
	mesaRead = &read->Base;

	/* check for same context and buffer */
	if (mesaCtx == _mesa_get_current_context()
	    && mesaCtx->DrawBuffer == mesaDraw
	    && mesaCtx->ReadBuffer == mesaRead) {
	    return GL_TRUE;
	}

	_glapi_check_multithread();

	swrast_check_and_update_window_size(mesaCtx, mesaDraw);
	if (read != draw)
	    swrast_check_and_update_window_size(mesaCtx, mesaRead);

	_mesa_make_current( mesaCtx,
			    mesaDraw,
			    mesaRead );
    }
    else {
	/* unbind */
	_mesa_make_current( NULL, NULL, NULL );
    }

    return GL_TRUE;
}

static int driUnbindContext(__DRIcontext *ctx)
{
    TRACE;
    (void) ctx;
    return GL_TRUE;
}


static const __DRIcoreExtension driCoreExtension = {
    { __DRI_CORE, __DRI_CORE_VERSION },
    NULL, /* driCreateNewScreen */
    driDestroyScreen,
    driGetExtensions,
    driGetConfigAttrib,
    driIndexConfigAttrib,
    NULL, /* driCreateNewDrawable */
    driDestroyDrawable,
    driSwapBuffers,
    driCreateNewContext,
    driCopyContext,
    driDestroyContext,
    driBindContext,
    driUnbindContext
};

static const __DRIswrastExtension driSWRastExtension = {
    { __DRI_SWRAST, __DRI_SWRAST_VERSION },
    driCreateNewScreen,
    driCreateNewDrawable
};

/* This is the table of extensions that the loader will dlsym() for. */
PUBLIC const __DRIextension *__driDriverExtensions[] = {
    &driCoreExtension.base,
    &driSWRastExtension.base,
    NULL
};