osmesa.c

mesa-6.5-minigui源码

       osmesa->format != OSMESA_ARGB)     return NULL;

   if (swrast->_RasterMask==DEPTH_BIT
       && ctx->Depth.Func==GL_LESS
       && ctx->Depth.Mask==GL_TRUE
       && ctx->Visual.depthBits == DEFAULT_SOFTWARE_DEPTH_BITS) {
      return (swrast_line_func) flat_rgba_z_line;
   }

   if (swrast->_RasterMask == 0) {
      return (swrast_line_func) flat_rgba_line;
   }

   return (swrast_line_func) NULL;
}


/**********************************************************************/
/*****                 Optimized triangle rendering               *****/
/**********************************************************************/


/*
 * Smooth-shaded, z-less triangle, RGBA color.
 */
#define NAME smooth_rgba_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define INTERP_RGB 1
#define INTERP_ALPHA 1
#define SETUP_CODE \
   const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
#define RENDER_SPAN( span ) {					\
   GLuint i;							\
   GLchan *img = PIXELADDR4(span.x, span.y); 			\
   for (i = 0; i < span.end; i++, img += 4) {			\
      const GLuint z = FixedToDepth(span.z);			\
      if (z < zRow[i]) {					\
         PACK_RGBA(img, FixedToChan(span.red),			\
            FixedToChan(span.green), FixedToChan(span.blue),	\
            FixedToChan(span.alpha));				\
         zRow[i] = z;						\
      }								\
      span.red += span.redStep;					\
      span.green += span.greenStep;				\
      span.blue += span.blueStep;				\
      span.alpha += span.alphaStep;				\
      span.z += span.zStep;					\
   }                                                            \
}
#ifdef WIN32
#include "..\swrast\s_tritemp.h"
#else
#include "swrast/s_tritemp.h"
#endif



/*
 * Flat-shaded, z-less triangle, RGBA color.
 */
#define NAME flat_rgba_z_triangle
#define INTERP_Z 1
#define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
#define SETUP_CODE						\
   const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);		\
   GLuint pixel;						\
   PACK_RGBA((GLchan *) &pixel, v2->color[0], v2->color[1],	\
                                v2->color[2], v2->color[3]);

#define RENDER_SPAN( span ) {				\
   GLuint i;						\
   GLuint *img = (GLuint *) PIXELADDR4(span.x, span.y);	\
   for (i = 0; i < span.end; i++) {			\
      const GLuint z = FixedToDepth(span.z);		\
      if (z < zRow[i]) {				\
         img[i] = pixel;				\
         zRow[i] = z;					\
      }							\
      span.z += span.zStep;				\
   }                                                    \
}
#ifdef WIN32
#include "..\swrast\s_tritemp.h"
#else
#include "swrast/s_tritemp.h"
#endif



/*
 * Return pointer to an accelerated triangle function if possible.
 */
static swrast_tri_func
osmesa_choose_triangle_function( GLcontext *ctx )
{
   const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);
   const SWcontext *swrast = SWRAST_CONTEXT(ctx);

   if (CHAN_BITS != 8)                  return (swrast_tri_func) NULL;
   if (ctx->RenderMode != GL_RENDER)    return (swrast_tri_func) NULL;
   if (ctx->Polygon.SmoothFlag)         return (swrast_tri_func) NULL;
   if (ctx->Polygon.StippleFlag)        return (swrast_tri_func) NULL;
   if (ctx->Texture._EnabledUnits)      return (swrast_tri_func) NULL;
   if (osmesa->format != OSMESA_RGBA &&
       osmesa->format != OSMESA_BGRA &&
       osmesa->format != OSMESA_ARGB)   return (swrast_tri_func) NULL;
   if (ctx->Polygon.CullFlag && 
       ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
                                        return (swrast_tri_func) NULL;

   if (swrast->_RasterMask == DEPTH_BIT &&
       ctx->Depth.Func == GL_LESS &&
       ctx->Depth.Mask == GL_TRUE &&
       ctx->Visual.depthBits == DEFAULT_SOFTWARE_DEPTH_BITS) {
      if (ctx->Light.ShadeModel == GL_SMOOTH) {
         return (swrast_tri_func) smooth_rgba_z_triangle;
      }
      else {
         return (swrast_tri_func) flat_rgba_z_triangle;
      }
   }
   return (swrast_tri_func) NULL;
}



/* Override for the swrast triangle-selection function.  Try to use one
 * of our internal triangle functions, otherwise fall back to the
 * standard swrast functions.
 */
static void
osmesa_choose_triangle( GLcontext *ctx )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   swrast->Triangle = osmesa_choose_triangle_function( ctx );
   if (!swrast->Triangle)
      _swrast_choose_triangle( ctx );
}

static void
osmesa_choose_line( GLcontext *ctx )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   swrast->Line = osmesa_choose_line_function( ctx );
   if (!swrast->Line)
      _swrast_choose_line( ctx );
}


/**
 * Don't use _mesa_delete_renderbuffer since we can't free rb->Data.
 */
static void
osmesa_delete_renderbuffer(struct gl_renderbuffer *rb)
{
   _mesa_free(rb);
}


/**
 * Allocate renderbuffer storage.  We don't actually allocate any storage
 * since we're using a user-provided buffer.
 * Just set up all the gl_renderbuffer methods.
 */
static GLboolean
osmesa_renderbuffer_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
                            GLenum internalFormat, GLuint width, GLuint height)
{
   const OSMesaContext osmesa = OSMESA_CONTEXT(ctx);

   /* Note: we can ignoring internalFormat for "window-system" renderbuffers */
   if (osmesa->format == OSMESA_RGBA) {
      rb->GetRow = get_row_RGBA;
      rb->GetValues = get_values_RGBA;
      rb->PutRow = put_row_RGBA;
      rb->PutRowRGB = put_row_rgb_RGBA;
      rb->PutMonoRow = put_mono_row_RGBA;
      rb->PutValues = put_values_RGBA;
      rb->PutMonoValues = put_mono_values_RGBA;
      rb->RedBits =
      rb->GreenBits =
      rb->BlueBits =
      rb->AlphaBits = 8 * sizeof(GLchan);
   }
   else if (osmesa->format == OSMESA_BGRA) {
      rb->GetRow = get_row_BGRA;
      rb->GetValues = get_values_BGRA;
      rb->PutRow = put_row_BGRA;
      rb->PutRowRGB = put_row_rgb_BGRA;
      rb->PutMonoRow = put_mono_row_BGRA;
      rb->PutValues = put_values_BGRA;
      rb->PutMonoValues = put_mono_values_BGRA;
      rb->RedBits =
      rb->GreenBits =
      rb->BlueBits =
      rb->AlphaBits = 8 * sizeof(GLchan);
   }
   else if (osmesa->format == OSMESA_ARGB) {
      rb->GetRow = get_row_ARGB;
      rb->GetValues = get_values_ARGB;
      rb->PutRow = put_row_ARGB;
      rb->PutRowRGB = put_row_rgb_ARGB;
      rb->PutMonoRow = put_mono_row_ARGB;
      rb->PutValues = put_values_ARGB;
      rb->PutMonoValues = put_mono_values_ARGB;
      rb->RedBits =
      rb->GreenBits =
      rb->BlueBits =
      rb->AlphaBits = 8 * sizeof(GLchan);
   }
   else if (osmesa->format == OSMESA_RGB) {
      rb->GetRow = get_row_RGB;
      rb->GetValues = get_values_RGB;
      rb->PutRow = put_row_RGB;
      rb->PutRowRGB = put_row_rgb_RGB;
      rb->PutMonoRow = put_mono_row_RGB;
      rb->PutValues = put_values_RGB;
      rb->PutMonoValues = put_mono_values_RGB;
      rb->RedBits =
      rb->GreenBits =
      rb->BlueBits = 8 * sizeof(GLchan);
   }
   else if (osmesa->format == OSMESA_BGR) {
      rb->GetRow = get_row_BGR;
      rb->GetValues = get_values_BGR;
      rb->PutRow = put_row_BGR;
      rb->PutRowRGB = put_row_rgb_BGR;
      rb->PutMonoRow = put_mono_row_BGR;
      rb->PutValues = put_values_BGR;
      rb->PutMonoValues = put_mono_values_BGR;
      rb->RedBits =
      rb->GreenBits =
      rb->BlueBits = 8 * sizeof(GLchan);
   }
#if CHAN_TYPE == GL_UNSIGNED_BYTE
   else if (osmesa->format == OSMESA_RGB_565) {
      rb->GetRow = get_row_RGB_565;
      rb->GetValues = get_values_RGB_565;
      rb->PutRow = put_row_RGB_565;
      rb->PutRowRGB = put_row_rgb_RGB_565;
      rb->PutMonoRow = put_mono_row_RGB_565;
      rb->PutValues = put_values_RGB_565;
      rb->PutMonoValues = put_mono_values_RGB_565;
      rb->RedBits = 5;
      rb->GreenBits = 6;
      rb->BlueBits = 5;
   }
#endif
   else if (osmesa->format == OSMESA_COLOR_INDEX) {
      rb->GetRow = get_row_CI;
      rb->GetValues = get_values_CI;
      rb->PutRow = put_row_CI;
      rb->PutMonoRow = put_mono_row_CI;
      rb->PutValues = put_values_CI;
      rb->PutMonoValues = put_mono_values_CI;
      rb->IndexBits = 8;
   }
   else {
      _mesa_problem(ctx, "bad pixel format in osmesa renderbuffer_storage");
   }

   return GL_TRUE;
}


/**
 * Allocate a new renderbuffer tpo describe the user-provided color buffer.
 */
static struct gl_renderbuffer *
new_osmesa_renderbuffer(GLenum format)
{
   struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
   if (rb) {
      const GLuint name = 0;
      _mesa_init_renderbuffer(rb, name);

      rb->Delete = osmesa_delete_renderbuffer;
      rb->AllocStorage = osmesa_renderbuffer_storage;

      if (format == OSMESA_COLOR_INDEX) {
         rb->_BaseFormat = GL_COLOR_INDEX;
         rb->InternalFormat = GL_COLOR_INDEX;
         rb->DataType = GL_UNSIGNED_BYTE;
      }
      else {
         rb->_BaseFormat = GL_RGBA;
         rb->InternalFormat = GL_RGBA;
         rb->DataType = CHAN_TYPE;
      }
   }
   return rb;
}



/**********************************************************************/
/*****                    Public Functions                        *****/
/**********************************************************************/


/*
 * Create an Off-Screen Mesa rendering context.  The only attribute needed is
 * an RGBA vs Color-Index mode flag.
 *
 * Input:  format - either GL_RGBA or GL_COLOR_INDEX
 *         sharelist - specifies another OSMesaContext with which to share
 *                     display lists.  NULL indicates no sharing.
 * Return:  an OSMesaContext or 0 if error
 */
GLAPI OSMesaContext GLAPIENTRY
OSMesaCreateContext( GLenum format, OSMesaContext sharelist )
{
   const GLint accumBits = (format == OSMESA_COLOR_INDEX) ? 0 : 16;
   return OSMesaCreateContextExt(format, DEFAULT_SOFTWARE_DEPTH_BITS,
                                 8, accumBits, sharelist);
}



/*
 * New in Mesa 3.5
 *
 * Create context and specify size of ancillary buffers.
 */
GLAPI OSMesaContext GLAPIENTRY
OSMesaCreateContextExt( GLenum format, GLint depthBits, GLint stencilBits,
                        GLint accumBits, OSMesaContext sharelist )
{
   OSMesaContext osmesa;
   struct dd_function_table functions;
   GLint rind, gind, bind, aind;
   GLint indexBits = 0, redBits = 0, greenBits = 0, blueBits = 0, alphaBits =0;
   GLboolean rgbmode;

   rind = gind = bind = aind = 0;
   if (format==OSMESA_COLOR_INDEX) {
      indexBits = 8;
      rgbmode = GL_FALSE;
   }
   else if (format==OSMESA_RGBA) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = CHAN_BITS;
      rind = 0;
      gind = 1;
      bind = 2;
      aind = 3;
      rgbmode = GL_TRUE;
   }
   else if (format==OSMESA_BGRA) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = CHAN_BITS;
      bind = 0;
      gind = 1;
      rind = 2;
      aind = 3;
      rgbmode = GL_TRUE;
   }
   else if (format==OSMESA_ARGB) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = CHAN_BITS;
      aind = 0;
      rind = 1;
      gind = 2;
      bind = 3;
      rgbmode = GL_TRUE;
   }
   else if (format==OSMESA_RGB) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = 0;
      rind = 0;
      gind = 1;
      bind = 2;
      rgbmode = GL_TRUE;
   }
   else if (format==OSMESA_BGR) {
      indexBits = 0;
      redBits = CHAN_BITS;
      greenBits = CHAN_BITS;
      blueBits = CHAN_BITS;
      alphaBits = 0;
      rind = 2;
      gind = 1;
      bind = 0;
      rgbmode = GL_TRUE;
   }
#if CHAN_TYPE == GL_UNSIGNED_BYTE
   else if (format==OSMESA_RGB_565) {
      indexBits = 0;
      redBits = 5;
      greenBits = 6;
      blueBits = 5;
      alphaBits = 0;
      rind = 0; /* not used */
      gind = 0;
      bind = 0;
      rgbmode = GL_TRUE;
   }
#endif
   else {
      return NULL;
   }

   osmesa = (OSMesaContext) CALLOC_STRUCT(osmesa_context);
   if (osmesa) {
      osmesa->gl_visual = _mesa_create_visual( rgbmode,
                                               GL_FALSE,    /* double buffer */
                                               GL_FALSE,    /* stereo */
                                               redBits,
                                               greenBits,
                                               blueBits,
                                               alphaBits,
                                               indexBits,
                                               depthBits,
                                               stencilBits,
                                               accumBits,