renderbuffer.c

winNT技术操作系统,国外开放的原代码和LIUX一样

   rb->PutMonoRow = NULL;
   rb->PutValues = NULL;
   rb->PutMonoValues = NULL;
}


/**
 * Allocate a new gl_renderbuffer object.  This can be used for user-created
 * renderbuffers or window-system renderbuffers.
 */
struct gl_renderbuffer *
_mesa_new_renderbuffer(GLcontext *ctx, GLuint name)
{
   struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
   if (rb) {
      _mesa_init_renderbuffer(rb, name);
   }
   return rb;
}


/**
 * Delete a gl_framebuffer.
 * This is the default function for framebuffer->Delete().
 */
void
_mesa_delete_renderbuffer(struct gl_renderbuffer *rb)
{
   if (rb->Data) {
      _mesa_free(rb->Data);
   }
   _mesa_free(rb);
}


/**
 * Allocate a software-based renderbuffer.  This is called via the
 * ctx->Driver.NewRenderbuffer() function when the user creates a new
 * renderbuffer.
 */
struct gl_renderbuffer *
_mesa_new_soft_renderbuffer(GLcontext *ctx, GLuint name)
{
   struct gl_renderbuffer *rb = _mesa_new_renderbuffer(ctx, name);
   if (rb) {
      rb->AllocStorage = soft_renderbuffer_storage;
      /* Normally, one would setup the PutRow, GetRow, etc functions here.
       * But we're doing that in the soft_renderbuffer_storage() function
       * instead.
       */
   }
   return rb;
}


/**
 * Add software-based color renderbuffers to the given framebuffer.
 * This is a helper routine for device drivers when creating a
 * window system framebuffer (not a user-created render/framebuffer).
 * Once this function is called, you can basically forget about this
 * renderbuffer; core Mesa will handle all the buffer management and
 * rendering!
 */
GLboolean
_mesa_add_color_renderbuffers(GLcontext *ctx, struct gl_framebuffer *fb,
                              GLuint rgbBits, GLuint alphaBits,
                              GLboolean frontLeft, GLboolean backLeft,
                              GLboolean frontRight, GLboolean backRight)
{
   GLuint b;

   if (rgbBits > 16 || alphaBits > 16) {
      _mesa_problem(ctx,
                    "Unsupported bit depth in _mesa_add_color_renderbuffers");
      return GL_FALSE;
   }

   assert(MAX_COLOR_ATTACHMENTS >= 4);

   for (b = BUFFER_FRONT_LEFT; b <= BUFFER_BACK_RIGHT; b++) {
      struct gl_renderbuffer *rb;

      if (b == BUFFER_FRONT_LEFT && !frontLeft)
         continue;
      else if (b == BUFFER_BACK_LEFT && !backLeft)
         continue;
      else if (b == BUFFER_FRONT_RIGHT && !frontRight)
         continue;
      else if (b == BUFFER_BACK_RIGHT && !backRight)
         continue;

      assert(fb->Attachment[b].Renderbuffer == NULL);

      rb = _mesa_new_renderbuffer(ctx, 0);
      if (!rb) {
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating color buffer");
         return GL_FALSE;
      }

      if (rgbBits <= 8) {
         if (alphaBits)
            rb->InternalFormat = GL_RGBA8;
         else
            rb->InternalFormat = GL_RGB8;
      }
      else {
         assert(rgbBits <= 16);
         if (alphaBits)
            rb->InternalFormat = GL_RGBA16;
         else
            rb->InternalFormat = GL_RGBA16; /* don't really have RGB16 yet */
      }

      rb->AllocStorage = soft_renderbuffer_storage;
      _mesa_add_renderbuffer(fb, b, rb);
   }

   return GL_TRUE;
}


/**
 * Add software-based color index renderbuffers to the given framebuffer.
 * This is a helper routine for device drivers when creating a
 * window system framebuffer (not a user-created render/framebuffer).
 * Once this function is called, you can basically forget about this
 * renderbuffer; core Mesa will handle all the buffer management and
 * rendering!
 */
GLboolean
_mesa_add_color_index_renderbuffers(GLcontext *ctx, struct gl_framebuffer *fb,
                                    GLuint indexBits,
                                    GLboolean frontLeft, GLboolean backLeft,
                                    GLboolean frontRight, GLboolean backRight)
{
   GLuint b;

   if (indexBits > 8) {
      _mesa_problem(ctx,
                    "Unsupported bit depth in _mesa_add_color_renderbuffers");
      return GL_FALSE;
   }

   assert(MAX_COLOR_ATTACHMENTS >= 4);

   for (b = BUFFER_FRONT_LEFT; b <= BUFFER_BACK_RIGHT; b++) {
      struct gl_renderbuffer *rb;

      if (b == BUFFER_FRONT_LEFT && !frontLeft)
         continue;
      else if (b == BUFFER_BACK_LEFT && !backLeft)
         continue;
      else if (b == BUFFER_FRONT_RIGHT && !frontRight)
         continue;
      else if (b == BUFFER_BACK_RIGHT && !backRight)
         continue;

      assert(fb->Attachment[b].Renderbuffer == NULL);

      rb = _mesa_new_renderbuffer(ctx, 0);
      if (!rb) {
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating color buffer");
         return GL_FALSE;
      }

      if (indexBits <= 8) {
         /* only support GLuint for now */
         /*rb->InternalFormat = GL_COLOR_INDEX8_EXT;*/
         rb->InternalFormat = COLOR_INDEX32;
      }
      else {
         rb->InternalFormat = COLOR_INDEX32;
      }
      rb->AllocStorage = soft_renderbuffer_storage;
      _mesa_add_renderbuffer(fb, b, rb);
   }

   return GL_TRUE;
}


/**
 * Add software-based alpha renderbuffers to the given framebuffer.
 * This is a helper routine for device drivers when creating a
 * window system framebuffer (not a user-created render/framebuffer).
 * Once this function is called, you can basically forget about this
 * renderbuffer; core Mesa will handle all the buffer management and
 * rendering!
 */
GLboolean
_mesa_add_alpha_renderbuffers(GLcontext *ctx, struct gl_framebuffer *fb,
                              GLuint alphaBits,
                              GLboolean frontLeft, GLboolean backLeft,
                              GLboolean frontRight, GLboolean backRight)
{
   GLuint b;

   /* for window system framebuffers only! */
   assert(fb->Name == 0);

   if (alphaBits > 8) {
      _mesa_problem(ctx,
                    "Unsupported bit depth in _mesa_add_alpha_renderbuffers");
      return GL_FALSE;
   }

   assert(MAX_COLOR_ATTACHMENTS >= 4);

   /* Wrap each of the RGB color buffers with an alpha renderbuffer.
    */
   for (b = BUFFER_FRONT_LEFT; b <= BUFFER_BACK_RIGHT; b++) {
      struct gl_renderbuffer *arb;

      if (b == BUFFER_FRONT_LEFT && !frontLeft)
         continue;
      else if (b == BUFFER_BACK_LEFT && !backLeft)
         continue;
      else if (b == BUFFER_FRONT_RIGHT && !frontRight)
         continue;
      else if (b == BUFFER_BACK_RIGHT && !backRight)
         continue;

      /* the RGB buffer to wrap must already exist!! */
      assert(fb->Attachment[b].Renderbuffer);

      /* only GLubyte supported for now */
      assert(fb->Attachment[b].Renderbuffer->DataType == GL_UNSIGNED_BYTE);

      /* allocate alpha renderbuffer */
      arb = _mesa_new_renderbuffer(ctx, 0);
      if (!arb) {
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating alpha buffer");
         return GL_FALSE;
      }

      /* wrap the alpha renderbuffer around the RGB renderbuffer */
      arb->Wrapped = fb->Attachment[b].Renderbuffer;

      /* Set up my alphabuffer fields and plug in my functions.
       * The functions will put/get the alpha values from/to RGBA arrays
       * and then call the wrapped buffer's functions to handle the RGB
       * values.
       */
      arb->InternalFormat = arb->Wrapped->InternalFormat;
      arb->_BaseFormat    = arb->Wrapped->_BaseFormat;
      arb->DataType       = arb->Wrapped->DataType;
      arb->AllocStorage   = alloc_storage_alpha8;
      arb->Delete         = delete_renderbuffer_alpha8;
      arb->GetPointer     = get_pointer_alpha8;
      arb->GetRow         = get_row_alpha8;
      arb->GetValues      = get_values_alpha8;
      arb->PutRow         = put_row_alpha8;
      arb->PutRowRGB      = put_row_rgb_alpha8;
      arb->PutMonoRow     = put_mono_row_alpha8;
      arb->PutValues      = put_values_alpha8;
      arb->PutMonoValues  = put_mono_values_alpha8;

      /* clear the pointer to avoid assertion/sanity check failure later */
      fb->Attachment[b].Renderbuffer = NULL;

      /* plug the alpha renderbuffer into the colorbuffer attachment */
      _mesa_add_renderbuffer(fb, b, arb);
   }

   return GL_TRUE;
}


/**
 * Add a software-based depth renderbuffer to the given framebuffer.
 * This is a helper routine for device drivers when creating a
 * window system framebuffer (not a user-created render/framebuffer).
 * Once this function is called, you can basically forget about this
 * renderbuffer; core Mesa will handle all the buffer management and
 * rendering!
 */
GLboolean
_mesa_add_depth_renderbuffer(GLcontext *ctx, struct gl_framebuffer *fb,
                             GLuint depthBits)
{
   struct gl_renderbuffer *rb;

   if (depthBits > 32) {
      _mesa_problem(ctx,
                    "Unsupported depthBits in _mesa_add_depth_renderbuffer");
      return GL_FALSE;
   }

   assert(fb->Attachment[BUFFER_DEPTH].Renderbuffer == NULL);

   rb = _mesa_new_renderbuffer(ctx, 0);
   if (!rb) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating depth buffer");
      return GL_FALSE;
   }

   if (depthBits <= 16) {
      rb->InternalFormat = GL_DEPTH_COMPONENT16;
   }
   else {
      rb->InternalFormat = GL_DEPTH_COMPONENT32;
   }

   rb->AllocStorage = soft_renderbuffer_storage;
   _mesa_add_renderbuffer(fb, BUFFER_DEPTH, rb);

   return GL_TRUE;
}


/**
 * Add a software-based stencil renderbuffer to the given framebuffer.
 * This is a helper routine for device drivers when creating a
 * window system framebuffer (not a user-created render/framebuffer).
 * Once this function is called, you can basically forget about this
 * renderbuffer; core Mesa will handle all the buffer management and
 * rendering!
 */
GLboolean
_mesa_add_stencil_renderbuffer(GLcontext *ctx, struct gl_framebuffer *fb,
                               GLuint stencilBits)
{
   struct gl_renderbuffer *rb;

   if (stencilBits > 16) {
      _mesa_problem(ctx,
                  "Unsupported stencilBits in _mesa_add_stencil_renderbuffer");
      return GL_FALSE;
   }

   assert(fb->Attachment[BUFFER_STENCIL].Renderbuffer == NULL);

   rb = _mesa_new_renderbuffer(ctx, 0);
   if (!rb) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating stencil buffer");
      return GL_FALSE;
   }

   if (stencilBits <= 8) {
      rb->InternalFormat = GL_STENCIL_INDEX8_EXT;
   }
   else {
      /* not really supported (see s_stencil.c code) */
      rb->InternalFormat = GL_STENCIL_INDEX16_EXT;
   }

   rb->AllocStorage = soft_renderbuffer_storage;
   _mesa_add_renderbuffer(fb, BUFFER_STENCIL, rb);

   return GL_TRUE;
}


/**
 * Add a software-based accumulation renderbuffer to the given framebuffer.
 * This is a helper routine for device drivers when creating a
 * window system framebuffer (not a user-created render/framebuffer).
 * Once this function is called, you can basically forget about this
 * renderbuffer; core Mesa will handle all the buffer management and
 * rendering!
 */
GLboolean
_mesa_add_accum_renderbuffer(GLcontext *ctx, struct gl_framebuffer *fb,
                             GLuint redBits, GLuint greenBits,
                             GLuint blueBits, GLuint alphaBits)
{
   struct gl_renderbuffer *rb;

   if (redBits > 16 || greenBits > 16 || blueBits > 16 || alphaBits > 16) {
      _mesa_problem(ctx,
                    "Unsupported accumBits in _mesa_add_accum_renderbuffer");
      return GL_FALSE;
   }

   assert(fb->Attachment[BUFFER_ACCUM].Renderbuffer == NULL);

   rb = _mesa_new_renderbuffer(ctx, 0);
   if (!rb) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating accum buffer");
      return GL_FALSE;
   }

   rb->InternalFormat = GL_RGBA16;
   rb->AllocStorage = soft_renderbuffer_storage;
   _mesa_add_renderbuffer(fb, BUFFER_ACCUM, rb);

   return GL_TRUE;
}



/**
 * Add a software-based accumulation renderbuffer to the given framebuffer.
 * This is a helper routine for device drivers when creating a
 * window system framebuffer (not a user-created render/framebuffer).
 * Once this function is called, you can basically forget about this
 * renderbuffer; core Mesa will handle all the buffer management and
 * rendering!
 *
 * NOTE: color-index aux buffers not supported.
 */
GLboolean
_mesa_add_aux_renderbuffers(GLcontext *ctx, struct gl_framebuffer *fb,
                            GLuint colorBits, GLuint numBuffers)
{
   GLuint i;

   if (colorBits > 16) {
      _mesa_problem(ctx,
                    "Unsupported accumBits in _mesa_add_aux_renderbuffers");
      return GL_FALSE;
   }

   assert(numBuffers < MAX_AUX_BUFFERS);

   for (i = 0; i < numBuffers; i++) {
      struct gl_renderbuffer *rb = _mesa_new_renderbuffer(ctx, 0);

      assert(fb->Attachment[BUFFER_AUX0 + i].Renderbuffer == NULL);

      if (!rb) {
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating accum buffer");
         return GL_FALSE;
      }

      if (colorBits <= 8) {
         rb->InternalFormat = GL_RGBA8;
      }
      else {
         rb->InternalFormat = GL_RGBA16;
      }

      rb->AllocStorage = soft_renderbuffer_storage;
      _mesa_add_renderbuffer(fb, BUFFER_AUX0 + i, rb);
   }
   return GL_TRUE;
}



/**
 * Attach a renderbuffer to a framebuffer.
 */
void
_mesa_add_renderbuffer(struct gl_framebuffer *fb,
                       GLuint bufferName, struct gl_renderbuffer *rb)
{
   assert(fb);
   assert(rb);
   /* there should be no previous renderbuffer on this attachment point! */
   assert(fb->Attachment[bufferName].Renderbuffer == NULL);
   assert(bufferName < BUFFER_COUNT);

   /* winsys vs. user-created buffer cross check */
   if (fb->Name) {
      assert(rb->Name);
   }
   else {
      assert(!rb->Name);
   }

   fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
   fb->Attachment[bufferName].Complete = GL_TRUE;
   fb->Attachment[bufferName].Renderbuffer = rb;
}