wmesa.c

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

	default:
	    break;
	}
    }
    else {
        /* front buffer (actual Windows window) */
	rb->PutRow = write_rgba_span_front;
	rb->PutRowRGB = write_rgb_span_front;
	rb->PutMonoRow = write_mono_rgba_span_front;
	rb->PutValues = write_rgba_pixels_front;
	rb->PutMonoValues = write_mono_rgba_pixels_front;
	rb->GetRow = read_rgba_span_front;
	rb->GetValues = read_rgba_pixels_front;
        rb->RedBits = 8; /* XXX fix these (565?) */
        rb->GreenBits = 8;
        rb->BlueBits = 8;
    }
}

/**
 * Called by ctx->Driver.ResizeBuffers()
 * Resize the front/back colorbuffers to match the latest window size.
 */
static void
wmesa_resize_buffers(GLcontext *ctx, GLframebuffer *buffer,
                     GLuint width, GLuint height)
{
    WMesaContext pwc = wmesa_context(ctx);
    WMesaFramebuffer pwfb = wmesa_framebuffer(buffer);

    if (pwfb->Base.Width != width || pwfb->Base.Height != height) {
	/* Realloc back buffer */
	if (ctx->Visual.doubleBufferMode == 1) {
	    wmDeleteBackingStore(pwfb);
	    wmCreateBackingStore(pwfb, width, height);
	}
    }
    _mesa_resize_framebuffer(ctx, buffer, width, height);
}


/**
 * Called by glViewport.
 * This is a good time for us to poll the current window size and adjust
 * our renderbuffers to match the current window size.
 * Remember, we have no opportunity to respond to conventional
 * resize events since the driver has no event loop.
 * Thus, we poll.
 * MakeCurrent also ends up making a call here, so that ensures
 * we get the viewport set correctly, even if the app does not call
 * glViewport and relies on the defaults.
 */
static void wmesa_viewport(GLcontext *ctx, 
			   GLint x, GLint y, 
			   GLsizei width, GLsizei height)
{
    WMesaContext pwc = wmesa_context(ctx);
    GLuint new_width, new_height;

    wmesa_get_buffer_size(ctx->WinSysDrawBuffer, &new_width, &new_height);

    /**
     * Resize buffers if the window size changed.
     */
    wmesa_resize_buffers(ctx, ctx->WinSysDrawBuffer, new_width, new_height);
    ctx->NewState |= _NEW_BUFFERS;  /* to update scissor / window bounds */
}




/**
 * Called when the driver should update it's state, based on the new_state
 * flags.
 */
static void wmesa_update_state(GLcontext *ctx, GLuint new_state)
{
    _swrast_InvalidateState(ctx, new_state);
    _swsetup_InvalidateState(ctx, new_state);
    _vbo_InvalidateState(ctx, new_state);
    _tnl_InvalidateState(ctx, new_state);

    /* TODO - This code is not complete yet because I 
     * don't know what to do for all state updates.
     */

    if (new_state & _NEW_BUFFERS) {
    }
}





/**********************************************************************/
/*****                   WMESA Functions                          *****/
/**********************************************************************/

WMesaContext WMesaCreateContext(HDC hDC, 
				HPALETTE* Pal,
				GLboolean rgb_flag,
				GLboolean db_flag,
				GLboolean alpha_flag)
{
    WMesaContext c;
    struct dd_function_table functions;
    GLint red_bits, green_bits, blue_bits, alpha_bits;
    GLcontext *ctx;
    GLvisual *visual;

    (void) Pal;
    
    /* Indexed mode not supported */
    if (!rgb_flag)
	return NULL;

    /* Allocate wmesa context */
    c = CALLOC_STRUCT(wmesa_context);
    if (!c)
	return NULL;

#if 0
    /* I do not understand this contributed code */
    /* Support memory and device contexts */
    if(WindowFromDC(hDC) != NULL) {
	c->hDC = GetDC(WindowFromDC(hDC)); /* huh ???? */
    }
    else {
	c->hDC = hDC;
    }
#else
    c->hDC = hDC;
#endif

    /* Get data for visual */
    /* Dealing with this is actually a bit of overkill because Mesa will end
     * up treating all color component size requests less than 8 by using 
     * a single byte per channel.  In addition, the interface to the span
     * routines passes colors as an entire byte per channel anyway, so there
     * is nothing to be saved by telling the visual to be 16 bits if the device
     * is 16 bits.  That is, Mesa is going to compute colors down to 8 bits per
     * channel anyway.
     * But we go through the motions here anyway.
     */
    switch (GetDeviceCaps(c->hDC, BITSPIXEL)) {
    case 16:
	red_bits = green_bits = blue_bits = 5;
	alpha_bits = 0;
	break;
    default:
	red_bits = green_bits = blue_bits = 8;
	alpha_bits = 8;
	break;
    }
    /* Create visual based on flags */
    visual = _mesa_create_visual(rgb_flag,
                                 db_flag,    /* db_flag */
                                 GL_FALSE,   /* stereo */
                                 red_bits, green_bits, blue_bits, /* color RGB */
                                 alpha_flag ? alpha_bits : 0, /* color A */
                                 0,          /* index bits */
                                 DEFAULT_SOFTWARE_DEPTH_BITS, /* depth_bits */
                                 8,          /* stencil_bits */
                                 16,16,16,   /* accum RGB */
                                 alpha_flag ? 16 : 0, /* accum A */
                                 1);         /* num samples */
    
    if (!visual) {
	_mesa_free(c);
	return NULL;
    }

    /* Set up driver functions */
    _mesa_init_driver_functions(&functions);
    functions.GetString = wmesa_get_string;
    functions.UpdateState = wmesa_update_state;
    functions.GetBufferSize = wmesa_get_buffer_size;
    functions.Flush = wmesa_flush;
    functions.Clear = clear;
    functions.ClearIndex = clear_index;
    functions.ClearColor = clear_color;
    functions.ResizeBuffers = wmesa_resize_buffers;
    functions.Viewport = wmesa_viewport;

    /* initialize the Mesa context data */
    ctx = &c->gl_ctx;
    _mesa_initialize_context(ctx, visual, NULL, &functions, (void *)c);

    _mesa_enable_sw_extensions(ctx);
    _mesa_enable_1_3_extensions(ctx);
    _mesa_enable_1_4_extensions(ctx);
    _mesa_enable_1_5_extensions(ctx);
    _mesa_enable_2_0_extensions(ctx);
    _mesa_enable_2_1_extensions(ctx);
  
    /* Initialize the software rasterizer and helper modules. */
    if (!_swrast_CreateContext(ctx) ||
        !_vbo_CreateContext(ctx) ||
        !_tnl_CreateContext(ctx) ||
	!_swsetup_CreateContext(ctx)) {
	_mesa_free_context_data(ctx);
	_mesa_free(c);
	return NULL;
    }
    _swsetup_Wakeup(ctx);
    TNL_CONTEXT(ctx)->Driver.RunPipeline = _tnl_run_pipeline;

    return c;
}


void WMesaDestroyContext( WMesaContext pwc )
{
    GLcontext *ctx = &pwc->gl_ctx;
    WMesaFramebuffer pwfb;
    GET_CURRENT_CONTEXT(cur_ctx);

    if (cur_ctx == ctx) {
        /* unbind current if deleting current context */
        WMesaMakeCurrent(NULL, NULL);
    }

    /* clean up frame buffer resources */
    pwfb = wmesa_lookup_framebuffer(pwc->hDC);
    if (pwfb) {
	if (ctx->Visual.doubleBufferMode == 1)
	    wmDeleteBackingStore(pwfb);
	wmesa_free_framebuffer(pwc->hDC);
    }

    /* Release for device, not memory contexts */
    if (WindowFromDC(pwc->hDC) != NULL)
    {
      ReleaseDC(WindowFromDC(pwc->hDC), pwc->hDC);
    }
    DeleteObject(pwc->clearPen); 
    DeleteObject(pwc->clearBrush); 
    
    _swsetup_DestroyContext(ctx);
    _tnl_DestroyContext(ctx);
    _vbo_DestroyContext(ctx);
    _swrast_DestroyContext(ctx);
    
    _mesa_free_context_data(ctx);
    _mesa_free(pwc);
}


/**
 * Create a new color renderbuffer.
 */
struct gl_renderbuffer *
wmesa_new_renderbuffer(void)
{
    struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
    if (!rb)
        return NULL;

    _mesa_init_renderbuffer(rb, (GLuint)0);
    
    rb->_BaseFormat = GL_RGBA;
    rb->InternalFormat = GL_RGBA;
    rb->DataType = CHAN_TYPE;
    rb->Delete = wmesa_delete_renderbuffer;
    rb->AllocStorage = wmesa_renderbuffer_storage;
    return rb;
}


void WMesaMakeCurrent(WMesaContext c, HDC hdc)
{
    WMesaFramebuffer pwfb;

    {
        /* return if already current */
        GET_CURRENT_CONTEXT(ctx);
        WMesaContext pwc = wmesa_context(ctx);
        if (pwc && c == pwc && pwc->hDC == hdc)
            return;
    }

    pwfb = wmesa_lookup_framebuffer(hdc);

    /* Lazy creation of framebuffers */
    if (c && !pwfb && hdc) {
        struct gl_renderbuffer *rb;
        GLvisual *visual = &c->gl_ctx.Visual;
        GLuint width, height;

        get_window_size(hdc, &width, &height);

	c->clearPen = CreatePen(PS_SOLID, 1, 0); 
	c->clearBrush = CreateSolidBrush(0); 

        pwfb = wmesa_new_framebuffer(hdc, visual);

	/* Create back buffer if double buffered */
	if (visual->doubleBufferMode == 1) {
	    wmCreateBackingStore(pwfb, width, height);
	}
	
        /* make render buffers */
        if (visual->doubleBufferMode == 1) {
            rb = wmesa_new_renderbuffer();
            _mesa_add_renderbuffer(&pwfb->Base, BUFFER_BACK_LEFT, rb);
            wmesa_set_renderbuffer_funcs(rb, pwfb->pixelformat, pwfb->cColorBits, 1);
	}
        rb = wmesa_new_renderbuffer();
        _mesa_add_renderbuffer(&pwfb->Base, BUFFER_FRONT_LEFT, rb);
        wmesa_set_renderbuffer_funcs(rb, pwfb->pixelformat, pwfb->cColorBits, 0);

	/* Let Mesa own the Depth, Stencil, and Accum buffers */
        _mesa_add_soft_renderbuffers(&pwfb->Base,
                                     GL_FALSE, /* color */
                                     visual->depthBits > 0,
                                     visual->stencilBits > 0,
                                     visual->accumRedBits > 0,
                                     visual->alphaBits >0, 
                                     GL_FALSE);
    }

    if (c && pwfb)
	_mesa_make_current(&c->gl_ctx, &pwfb->Base, &pwfb->Base);
    else
        _mesa_make_current(NULL, NULL, NULL);
}


void WMesaSwapBuffers( HDC hdc )
{
    GET_CURRENT_CONTEXT(ctx);
    WMesaContext pwc = wmesa_context(ctx);
    WMesaFramebuffer pwfb = wmesa_lookup_framebuffer(hdc);

    if (!pwfb) {
        _mesa_problem(NULL, "wmesa: swapbuffers on unknown hdc");
        return;
    }

    /* If we're swapping the buffer associated with the current context
     * we have to flush any pending rendering commands first.
     */
    if (pwc->hDC == hdc) {
	_mesa_notifySwapBuffers(ctx);

	BitBlt(pwfb->hDC, 0, 0, pwfb->Base.Width, pwfb->Base.Height,
	       pwfb->dib_hDC, 0, 0, SRCCOPY);
    }
    else {
        /* XXX for now only allow swapping current window */
        _mesa_problem(NULL, "wmesa: can't swap non-current window");
    }
}

void WMesaShareLists(WMesaContext ctx_to_share, WMesaContext ctx)
{
	_mesa_share_state(&ctx->gl_ctx, &ctx_to_share->gl_ctx);	
}

/* This is hopefully a temporary hack to define some needed dispatch
 * table entries.  Hopefully, I'll find a better solution.  The
 * dispatch table generation scripts ought to be making these dummy
 * stubs as well. */
#if !defined(__MINGW32__) || !defined(GL_NO_STDCALL)
void gl_dispatch_stub_543(void){}
void gl_dispatch_stub_544(void){}
void gl_dispatch_stub_545(void){}
void gl_dispatch_stub_546(void){}
void gl_dispatch_stub_547(void){}
void gl_dispatch_stub_548(void){}
void gl_dispatch_stub_549(void){}
void gl_dispatch_stub_550(void){}
void gl_dispatch_stub_551(void){}
void gl_dispatch_stub_552(void){}
void gl_dispatch_stub_553(void){}
void gl_dispatch_stub_554(void){}
void gl_dispatch_stub_555(void){}
void gl_dispatch_stub_556(void){}
void gl_dispatch_stub_557(void){}
void gl_dispatch_stub_558(void){}
void gl_dispatch_stub_559(void){}
void gl_dispatch_stub_560(void){}
void gl_dispatch_stub_561(void){}
void gl_dispatch_stub_565(void){}
void gl_dispatch_stub_566(void){}
void gl_dispatch_stub_577(void){}
void gl_dispatch_stub_578(void){}
void gl_dispatch_stub_603(void){}
void gl_dispatch_stub_645(void){}
void gl_dispatch_stub_646(void){}
void gl_dispatch_stub_647(void){}
void gl_dispatch_stub_648(void){}
void gl_dispatch_stub_649(void){}
void gl_dispatch_stub_650(void){}
void gl_dispatch_stub_651(void){}
void gl_dispatch_stub_652(void){}
void gl_dispatch_stub_653(void){}
void gl_dispatch_stub_733(void){}
void gl_dispatch_stub_734(void){}
void gl_dispatch_stub_735(void){}
void gl_dispatch_stub_736(void){}
void gl_dispatch_stub_737(void){}
void gl_dispatch_stub_738(void){}
void gl_dispatch_stub_744(void){}
void gl_dispatch_stub_745(void){}
void gl_dispatch_stub_746(void){}
void gl_dispatch_stub_760(void){}
void gl_dispatch_stub_761(void){}
void gl_dispatch_stub_763(void){}
void gl_dispatch_stub_765(void){}
void gl_dispatch_stub_766(void){}
void gl_dispatch_stub_767(void){}
void gl_dispatch_stub_768(void){}

void gl_dispatch_stub_562(void){}
void gl_dispatch_stub_563(void){}
void gl_dispatch_stub_564(void){}
void gl_dispatch_stub_567(void){}
void gl_dispatch_stub_568(void){}
void gl_dispatch_stub_569(void){}
void gl_dispatch_stub_580(void){}
void gl_dispatch_stub_581(void){}
void gl_dispatch_stub_606(void){}
void gl_dispatch_stub_654(void){}
void gl_dispatch_stub_655(void){}
void gl_dispatch_stub_656(void){}
void gl_dispatch_stub_739(void){}
void gl_dispatch_stub_740(void){}
void gl_dispatch_stub_741(void){}
void gl_dispatch_stub_748(void){}
void gl_dispatch_stub_749(void){}
void gl_dispatch_stub_769(void){}
void gl_dispatch_stub_770(void){}
void gl_dispatch_stub_771(void){}

#endif