fb_dri.c

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

/*
 * Mesa 3-D graphics library
 * Version:  6.3
 *
 * Copyright (C) 1999-2005  Brian Paul   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 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
 * BRIAN PAUL 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.
 */

/* Minimal swrast-based dri loadable driver.
 *
 * Todo:
 *   -- Use malloced (rather than framebuffer) memory for backbuffer
 *   -- 32bpp is hardwared -- fix
 *
 * NOTES:
 *   -- No mechanism for cliprects or resize notification --
 *      assumes this is a fullscreen device.  
 *   -- No locking -- assumes this is the only driver accessing this 
 *      device.
 *   -- Doesn't (yet) make use of any acceleration or other interfaces
 *      provided by fb.  Would be entirely happy working against any 
 *	fullscreen interface.
 *   -- HOWEVER: only a small number of pixelformats are supported, and
 *      the mechanism for choosing between them makes some assumptions
 *      that may not be valid everywhere.
 */

#include "driver.h"
#include "drm.h"
#include "utils.h"
#include "drirenderbuffer.h"

#include "buffers.h"
#include "extensions.h"
#include "framebuffer.h"
#include "renderbuffer.h"
#include "vbo/vbo.h"
#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "tnl/tnl.h"
#include "tnl/t_context.h"
#include "tnl/t_pipeline.h"
#include "drivers/common/driverfuncs.h"

void fbSetSpanFunctions(driRenderbuffer *drb, const GLvisual *vis);

typedef struct {
   GLcontext *glCtx;		/* Mesa context */

   struct {
      __DRIcontextPrivate *context;	
      __DRIscreenPrivate *screen;	
      __DRIdrawablePrivate *drawable; /* drawable bound to this ctx */
   } dri;
   
} fbContext, *fbContextPtr;

#define FB_CONTEXT(ctx)		((fbContextPtr)(ctx->DriverCtx))


static const GLubyte *
get_string(GLcontext *ctx, GLenum pname)
{
   (void) ctx;
   switch (pname) {
      case GL_RENDERER:
         return (const GLubyte *) "Mesa dumb framebuffer";
      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 );
}


/**
 * Called by ctx->Driver.GetBufferSize from in core Mesa to query the
 * current framebuffer size.
 */
static void
get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
{
   GET_CURRENT_CONTEXT(ctx);
   fbContextPtr fbmesa = FB_CONTEXT(ctx);

   *width  = fbmesa->dri.drawable->w;
   *height = fbmesa->dri.drawable->h;
}


static void
updateFramebufferSize(GLcontext *ctx)
{
   fbContextPtr fbmesa = FB_CONTEXT(ctx);
   struct gl_framebuffer *fb = ctx->WinSysDrawBuffer;
   if (fbmesa->dri.drawable->w != fb->Width ||
       fbmesa->dri.drawable->h != fb->Height) {
      driUpdateFramebufferSize(ctx, fbmesa->dri.drawable);
   }
}

static void
viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
{
   /* XXX this should be called after we acquire the DRI lock, not here */
   updateFramebufferSize(ctx);
}


static void
init_core_functions( struct dd_function_table *functions )
{
   functions->GetString = get_string;
   functions->UpdateState = update_state;
   functions->GetBufferSize = get_buffer_size;
   functions->Viewport = viewport;

   functions->Clear = _swrast_Clear;  /* could accelerate with blits */
}


/*
 * Generate code for span functions.
 */

/* 24-bit BGR */
#define NAME(PREFIX) PREFIX##_B8G8R8
#define FORMAT GL_RGBA8
#define SPAN_VARS \
   driRenderbuffer *drb = (driRenderbuffer *) rb;
#define INIT_PIXEL_PTR(P, X, Y) \
   GLubyte *P = (GLubyte *)drb->Base.Data + (drb->Base.Height - (Y)) * drb->pitch + (X) * 3;
#define INC_PIXEL_PTR(P) P += 3
#define STORE_PIXEL(DST, X, Y, VALUE) \
   DST[0] = VALUE[BCOMP]; \
   DST[1] = VALUE[GCOMP]; \
   DST[2] = VALUE[RCOMP]
#define FETCH_PIXEL(DST, SRC) \
   DST[RCOMP] = SRC[2]; \
   DST[GCOMP] = SRC[1]; \
   DST[BCOMP] = SRC[0]; \
   DST[ACOMP] = 0xff

#include "swrast/s_spantemp.h"


/* 32-bit BGRA */
#define NAME(PREFIX) PREFIX##_B8G8R8A8
#define FORMAT GL_RGBA8
#define SPAN_VARS \
   driRenderbuffer *drb = (driRenderbuffer *) rb;
#define INIT_PIXEL_PTR(P, X, Y) \
   GLubyte *P = (GLubyte *)drb->Base.Data + (drb->Base.Height - (Y)) * drb->pitch + (X) * 4;
#define INC_PIXEL_PTR(P) P += 4
#define STORE_PIXEL(DST, X, Y, VALUE) \
   DST[0] = VALUE[BCOMP]; \
   DST[1] = VALUE[GCOMP]; \
   DST[2] = VALUE[RCOMP]; \
   DST[3] = VALUE[ACOMP]
#define STORE_PIXEL_RGB(DST, X, Y, VALUE) \
   DST[0] = VALUE[BCOMP]; \
   DST[1] = VALUE[GCOMP]; \
   DST[2] = VALUE[RCOMP]; \
   DST[3] = 0xff
#define FETCH_PIXEL(DST, SRC) \
   DST[RCOMP] = SRC[2]; \
   DST[GCOMP] = SRC[1]; \
   DST[BCOMP] = SRC[0]; \
   DST[ACOMP] = SRC[3]

#include "swrast/s_spantemp.h"


/* 16-bit BGR (XXX implement dithering someday) */
#define NAME(PREFIX) PREFIX##_B5G6R5
#define FORMAT GL_RGBA8
#define SPAN_VARS \
   driRenderbuffer *drb = (driRenderbuffer *) rb;
#define INIT_PIXEL_PTR(P, X, Y) \
   GLushort *P = (GLushort *)drb->Base.Data + (drb->Base.Height - (Y)) * drb->pitch + (X) * 2;
#define INC_PIXEL_PTR(P) P += 1
#define STORE_PIXEL(DST, X, Y, VALUE) \
   DST[0] = ( (((VALUE[RCOMP]) & 0xf8) << 8) | (((VALUE[GCOMP]) & 0xfc) << 3) | ((VALUE[BCOMP]) >> 3) )
#define FETCH_PIXEL(DST, SRC) \
   DST[RCOMP] = ( (((SRC[0]) >> 8) & 0xf8) | (((SRC[0]) >> 11) & 0x7) ); \
   DST[GCOMP] = ( (((SRC[0]) >> 3) & 0xfc) | (((SRC[0]) >>  5) & 0x3) ); \
   DST[BCOMP] = ( (((SRC[0]) << 3) & 0xf8) | (((SRC[0])      ) & 0x7) ); \
   DST[ACOMP] = 0xff

#include "swrast/s_spantemp.h"


/* 15-bit BGR (XXX implement dithering someday) */
#define NAME(PREFIX) PREFIX##_B5G5R5
#define FORMAT GL_RGBA8
#define SPAN_VARS \
   driRenderbuffer *drb = (driRenderbuffer *) rb;
#define INIT_PIXEL_PTR(P, X, Y) \
   GLushort *P = (GLushort *)drb->Base.Data + (drb->Base.Height - (Y)) * drb->pitch + (X) * 2;
#define INC_PIXEL_PTR(P) P += 1
#define STORE_PIXEL(DST, X, Y, VALUE) \
   DST[0] = ( (((VALUE[RCOMP]) & 0xf8) << 7) | (((VALUE[GCOMP]) & 0xf8) << 2) | ((VALUE[BCOMP]) >> 3) )
#define FETCH_PIXEL(DST, SRC) \
   DST[RCOMP] = ( (((SRC[0]) >> 7) & 0xf8) | (((SRC[0]) >> 10) & 0x7) ); \
   DST[GCOMP] = ( (((SRC[0]) >> 2) & 0xf8) | (((SRC[0]) >>  5) & 0x7) ); \
   DST[BCOMP] = ( (((SRC[0]) << 3) & 0xf8) | (((SRC[0])      ) & 0x7) ); \
   DST[ACOMP] = 0xff

#include "swrast/s_spantemp.h"


/* 8-bit color index */
#define NAME(PREFIX) PREFIX##_CI8
#define FORMAT GL_COLOR_INDEX8_EXT
#define SPAN_VARS \
   driRenderbuffer *drb = (driRenderbuffer *) rb;
#define INIT_PIXEL_PTR(P, X, Y) \
   GLubyte *P = (GLubyte *)drb->Base.Data + (drb->Base.Height - (Y)) * drb->pitch + (X);
#define INC_PIXEL_PTR(P) P += 1
#define STORE_PIXEL(DST, X, Y, VALUE) \
   *DST = VALUE[0]
#define FETCH_PIXEL(DST, SRC) \
   DST = SRC[0]

#include "swrast/s_spantemp.h"



void
fbSetSpanFunctions(driRenderbuffer *drb, const GLvisual *vis)
{
   ASSERT(drb->Base.InternalFormat == GL_RGBA);
   if (drb->Base.InternalFormat == GL_RGBA) {
      if (vis->redBits == 5 && vis->greenBits == 6 && vis->blueBits == 5) {
         drb->Base.GetRow = get_row_B5G6R5;
         drb->Base.GetValues = get_values_B5G6R5;
         drb->Base.PutRow = put_row_B5G6R5;
         drb->Base.PutMonoRow = put_mono_row_B5G6R5;
         drb->Base.PutRowRGB = put_row_rgb_B5G6R5;
         drb->Base.PutValues = put_values_B5G6R5;
         drb->Base.PutMonoValues = put_mono_values_B5G6R5;
      }
      else if (vis->redBits == 5 && vis->greenBits == 5 && vis->blueBits == 5) {
         drb->Base.GetRow = get_row_B5G5R5;
         drb->Base.GetValues = get_values_B5G5R5;
         drb->Base.PutRow = put_row_B5G5R5;
         drb->Base.PutMonoRow = put_mono_row_B5G5R5;
         drb->Base.PutRowRGB = put_row_rgb_B5G5R5;
         drb->Base.PutValues = put_values_B5G5R5;
         drb->Base.PutMonoValues = put_mono_values_B5G5R5;
      }
      else if (vis->redBits == 8 && vis->greenBits == 8 && vis->blueBits == 8
               && vis->alphaBits == 8) {
         drb->Base.GetRow = get_row_B8G8R8A8;
         drb->Base.GetValues = get_values_B8G8R8A8;
         drb->Base.PutRow = put_row_B8G8R8A8;
         drb->Base.PutMonoRow = put_mono_row_B8G8R8A8;
         drb->Base.PutRowRGB = put_row_rgb_B8G8R8A8;
         drb->Base.PutValues = put_values_B8G8R8A8;
         drb->Base.PutMonoValues = put_mono_values_B8G8R8A8;
      }
      else if (vis->redBits == 8 && vis->greenBits == 8 && vis->blueBits == 8
               && vis->alphaBits == 0) {
         drb->Base.GetRow = get_row_B8G8R8;
         drb->Base.GetValues = get_values_B8G8R8;
         drb->Base.PutRow = put_row_B8G8R8;
         drb->Base.PutMonoRow = put_mono_row_B8G8R8;
         drb->Base.PutRowRGB = put_row_rgb_B8G8R8;
         drb->Base.PutValues = put_values_B8G8R8;
         drb->Base.PutMonoValues = put_mono_values_B8G8R8;
      }
      else if (vis->indexBits == 8) {
         drb->Base.GetRow = get_row_CI8;
         drb->Base.GetValues = get_values_CI8;
         drb->Base.PutRow = put_row_CI8;
         drb->Base.PutMonoRow = put_mono_row_CI8;
         drb->Base.PutValues = put_values_CI8;
         drb->Base.PutMonoValues = put_mono_values_CI8;
      }
   }
   else {
      /* hardware z/stencil/etc someday */
   }
}



/* Initialize the driver specific screen private data.
 */
static GLboolean
fbInitDriver( __DRIscreenPrivate *sPriv )
{
   sPriv->private = NULL;
   return GL_TRUE;
}

static void
fbDestroyScreen( __DRIscreenPrivate *sPriv )
{
}


/* Create the device specific context.
 */
static GLboolean
fbCreateContext( const __GLcontextModes *glVisual,
		 __DRIcontextPrivate *driContextPriv,
		 void *sharedContextPrivate)
{
   fbContextPtr fbmesa;
   GLcontext *ctx, *shareCtx;
   struct dd_function_table functions;

   assert(glVisual);
   assert(driContextPriv);

   /* Allocate the Fb context */
   fbmesa = (fbContextPtr) _mesa_calloc( sizeof(*fbmesa) );
   if ( !fbmesa )
      return GL_FALSE;

   /* Init default driver functions then plug in our FBdev-specific functions
    */
   _mesa_init_driver_functions(&functions);
   init_core_functions(&functions);

   /* Allocate the Mesa context */
   if (sharedContextPrivate)
      shareCtx = ((fbContextPtr) sharedContextPrivate)->glCtx;
   else
      shareCtx = NULL;

   ctx = fbmesa->glCtx = _mesa_create_context(glVisual, shareCtx, 
					      &functions, (void *) fbmesa);
   if (!fbmesa->glCtx) {
      _mesa_free(fbmesa);
      return GL_FALSE;
   }
   driContextPriv->driverPrivate = fbmesa;

   /* Create module contexts */
   _swrast_CreateContext( ctx );
   _vbo_CreateContext( ctx );
   _tnl_CreateContext( ctx );
   _swsetup_CreateContext( ctx );
   _swsetup_Wakeup( ctx );


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

   _mesa_enable_sw_extensions(ctx);

   return GL_TRUE;
}


static void
fbDestroyContext( __DRIcontextPrivate *driContextPriv )
{
   GET_CURRENT_CONTEXT(ctx);
   fbContextPtr fbmesa = (fbContextPtr) driContextPriv->driverPrivate;
   fbContextPtr current = ctx ? FB_CONTEXT(ctx) : NULL;

   /* check if we're deleting the currently bound context */
   if (fbmesa == current) {