renderbuffer.c

winNT技术操作系统,国外开放的原代码和LIUX一样

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static void
put_row_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
               GLint x, GLint y, const void *values, const GLubyte *mask)
{
   /* note: incoming values are RGB+A! */
   const GLubyte *src = (const GLubyte *) values;
   GLubyte *dst = (GLubyte *) rb->Data + 3 * (y * rb->Width + x);
   GLuint i;
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         dst[i * 3 + 0] = src[i * 4 + 0];
         dst[i * 3 + 1] = src[i * 4 + 1];
         dst[i * 3 + 2] = src[i * 4 + 2];
      }
   }
}


static void
put_row_rgb_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                   GLint x, GLint y, const void *values, const GLubyte *mask)
{
   /* note: incoming values are RGB+A! */
   const GLubyte *src = (const GLubyte *) values;
   GLubyte *dst = (GLubyte *) rb->Data + 3 * (y * rb->Width + x);
   GLuint i;
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         dst[i * 3 + 0] = src[i * 3 + 0];
         dst[i * 3 + 1] = src[i * 3 + 1];
         dst[i * 3 + 2] = src[i * 3 + 2];
      }
   }
}


static void
put_mono_row_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                    GLint x, GLint y, const void *value, const GLubyte *mask)
{
   /* note: incoming value is RGB+A! */
   const GLubyte val0 = ((const GLubyte *) value)[0];
   const GLubyte val1 = ((const GLubyte *) value)[1];
   const GLubyte val2 = ((const GLubyte *) value)[2];
   GLubyte *dst = (GLubyte *) rb->Data + 3 * (y * rb->Width + x);
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   if (!mask && val0 == val1 && val1 == val2) {
      /* optimized case */
      _mesa_memset(dst, val0, 3 * count);
   }
   else {
      GLuint i;
      for (i = 0; i < count; i++) {
         if (!mask || mask[i]) {
            dst[i * 3 + 0] = val0;
            dst[i * 3 + 1] = val1;
            dst[i * 3 + 2] = val2;
         }
      }
   }
}


static void
put_values_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                  const GLint x[], const GLint y[], const void *values,
                  const GLubyte *mask)
{
   /* note: incoming values are RGB+A! */
   const GLubyte *src = (const GLubyte *) values;
   GLuint i;
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         GLubyte *dst = (GLubyte *) rb->Data + 3 * (y[i] * rb->Width + x[i]);
         dst[0] = src[i * 4 + 0];
         dst[1] = src[i * 4 + 1];
         dst[2] = src[i * 4 + 2];
      }
   }
}


static void
put_mono_values_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb,
                       GLuint count, const GLint x[], const GLint y[],
                       const void *value, const GLubyte *mask)
{
   /* note: incoming value is RGB+A! */
   const GLubyte val0 = ((const GLubyte *) value)[0];
   const GLubyte val1 = ((const GLubyte *) value)[1];
   const GLubyte val2 = ((const GLubyte *) value)[2];
   GLuint i;
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         GLubyte *dst = (GLubyte *) rb->Data + 3 * (y[i] * rb->Width + x[i]);
         dst[0] = val0;
         dst[1] = val1;
         dst[2] = val2;
      }
   }
}


/**********************************************************************
 * Functions for buffers of 4 X GLubyte (or GLbyte) values.
 * Typically color buffers.
 */

static void *
get_pointer_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb,
                   GLint x, GLint y)
{
   if (!rb->Data)
      return NULL;
   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
   return (GLubyte *) rb->Data + 4 * (y * rb->Width + x);
}


static void
get_row_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
               GLint x, GLint y, void *values)
{
   const GLbyte *src = (const GLbyte *) rb->Data + 4 * (y * rb->Width + x);
   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
   _mesa_memcpy(values, src, 4 * count * sizeof(GLbyte));
}


static void
get_values_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                  const GLint x[], const GLint y[], void *values)
{
   /* treat 4*GLubyte as 1*GLuint */
   GLuint *dst = (GLuint *) values;
   GLuint i;
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; i++) {
      const GLuint *src = (GLuint *) rb->Data + (y[i] * rb->Width + x[i]);
      dst[i] = *src;
   }
}


static void
put_row_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
               GLint x, GLint y, const void *values, const GLubyte *mask)
{
   /* treat 4*GLubyte as 1*GLuint */
   const GLuint *src = (const GLuint *) values;
   GLuint *dst = (GLuint *) rb->Data + (y * rb->Width + x);
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   if (mask) {
      GLuint i;
      for (i = 0; i < count; i++) {
         if (mask[i]) {
            dst[i] = src[i];
         }
      }
   }
   else {
      _mesa_memcpy(dst, src, 4 * count * sizeof(GLubyte));
   }
}


static void
put_row_rgb_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                   GLint x, GLint y, const void *values, const GLubyte *mask)
{
   /* Store RGB values in RGBA buffer */
   const GLubyte *src = (const GLubyte *) values;
   GLubyte *dst = (GLubyte *) rb->Data + 4 * (y * rb->Width + x);
   GLuint i;
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         dst[i * 4 + 0] = src[i * 3 + 0];
         dst[i * 4 + 1] = src[i * 3 + 1];
         dst[i * 4 + 2] = src[i * 3 + 2];
         dst[i * 4 + 3] = 0xff;
      }
   }
}


static void
put_mono_row_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                    GLint x, GLint y, const void *value, const GLubyte *mask)
{
   /* treat 4*GLubyte as 1*GLuint */
   const GLuint val = *((const GLuint *) value);
   GLuint *dst = (GLuint *) rb->Data + (y * rb->Width + x);
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   if (!mask && val == 0) {
      /* common case */
      _mesa_bzero(dst, count * 4 * sizeof(GLubyte));
   }
   else {
      /* general case */
      if (mask) {
         GLuint i;
         for (i = 0; i < count; i++) {
            if (mask[i]) {
               dst[i] = val;
            }
         }
      }
      else {
         GLuint i;
         for (i = 0; i < count; i++) {
            dst[i] = val;
         }
      }
   }
}


static void
put_values_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                  const GLint x[], const GLint y[], const void *values,
                  const GLubyte *mask)
{
   /* treat 4*GLubyte as 1*GLuint */
   const GLuint *src = (const GLuint *) values;
   GLuint i;
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         GLuint *dst = (GLuint *) rb->Data + (y[i] * rb->Width + x[i]);
         *dst = src[i];
      }
   }
}


static void
put_mono_values_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb,
                       GLuint count, const GLint x[], const GLint y[],
                       const void *value, const GLubyte *mask)
{
   /* treat 4*GLubyte as 1*GLuint */
   const GLuint val = *((const GLuint *) value);
   GLuint i;
   assert(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         GLuint *dst = (GLuint *) rb->Data + (y[i] * rb->Width + x[i]);
         *dst = val;
      }
   }
}


/**********************************************************************
 * Functions for buffers of 4 X GLushort (or GLshort) values.
 * Typically accum buffer.
 */

static void *
get_pointer_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb,
                    GLint x, GLint y)
{
   if (!rb->Data)
      return NULL;
   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
   return (GLushort *) rb->Data + 4 * (y * rb->Width + x);
}


static void
get_row_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                GLint x, GLint y, void *values)
{
   const GLshort *src = (const GLshort *) rb->Data + 4 * (y * rb->Width + x);
   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
   _mesa_memcpy(values, src, 4 * count * sizeof(GLshort));
}


static void
get_values_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                   const GLint x[], const GLint y[], void *values)
{
   GLushort *dst = (GLushort *) values;
   GLuint i;
   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
   for (i = 0; i < count; i++) {
      const GLushort *src
         = (GLushort *) rb->Data + 4 * (y[i] * rb->Width + x[i]);
      dst[i] = *src;
   }
}


static void
put_row_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                GLint x, GLint y, const void *values, const GLubyte *mask)
{
   const GLushort *src = (const GLushort *) values;
   GLushort *dst = (GLushort *) rb->Data + 4 * (y * rb->Width + x);
   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
   if (mask) {
      GLuint i;
      for (i = 0; i < count; i++) {
         if (mask[i]) {
            dst[i * 4 + 0] = src[i * 4 + 0];
            dst[i * 4 + 1] = src[i * 4 + 1];
            dst[i * 4 + 2] = src[i * 4 + 2];
            dst[i * 4 + 3] = src[i * 4 + 3];
         }
      }
   }
   else {
      _mesa_memcpy(dst, src, 4 * count * sizeof(GLushort));
   }
}


static void
put_row_rgb_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                    GLint x, GLint y, const void *values, const GLubyte *mask)
{
   /* Put RGB values in RGBA buffer */
   const GLushort *src = (const GLushort *) values;
   GLushort *dst = (GLushort *) rb->Data + 4 * (y * rb->Width + x);
   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
   if (mask) {
      GLuint i;
      for (i = 0; i < count; i++) {
         if (mask[i]) {
            dst[i * 4 + 0] = src[i * 3 + 0];
            dst[i * 4 + 1] = src[i * 3 + 1];
            dst[i * 4 + 2] = src[i * 3 + 2];
            dst[i * 4 + 3] = 0xffff;
         }
      }
   }
   else {
      _mesa_memcpy(dst, src, 4 * count * sizeof(GLushort));
   }
}


static void
put_mono_row_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                     GLint x, GLint y, const void *value, const GLubyte *mask)
{
   const GLushort val0 = ((const GLushort *) value)[0];
   const GLushort val1 = ((const GLushort *) value)[1];
   const GLushort val2 = ((const GLushort *) value)[2];
   const GLushort val3 = ((const GLushort *) value)[3];
   GLushort *dst = (GLushort *) rb->Data + 4 * (y * rb->Width + x);
   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
   if (!mask && val0 == 0 && val1 == 0 && val2 == 0 && val3 == 0) {
      /* common case for clearing accum buffer */
      _mesa_bzero(dst, count * 4 * sizeof(GLushort));
   }
   else {
      GLuint i;
      for (i = 0; i < count; i++) {
         if (!mask || mask[i]) {
            dst[i * 4 + 0] = val0;
            dst[i * 4 + 1] = val1;
            dst[i * 4 + 2] = val2;
            dst[i * 4 + 3] = val3;
         }
      }
   }
}


static void
put_values_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                   const GLint x[], const GLint y[], const void *values,
                   const GLubyte *mask)
{
   const GLushort *src = (const GLushort *) values;
   GLuint i;
   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         GLushort *dst = (GLushort *) rb->Data + 4 * (y[i] * rb->Width + x[i]);
         dst[0] = src[i * 4 + 0];
         dst[1] = src[i * 4 + 1];
         dst[2] = src[i * 4 + 2];
         dst[3] = src[i * 4 + 3];
      }
   }
}


static void
put_mono_values_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb,
                        GLuint count, const GLint x[], const GLint y[],
                        const void *value, const GLubyte *mask)
{
   const GLushort val0 = ((const GLushort *) value)[0];
   const GLushort val1 = ((const GLushort *) value)[1];
   const GLushort val2 = ((const GLushort *) value)[2];
   const GLushort val3 = ((const GLushort *) value)[3];
   GLuint i;
   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         GLushort *dst = (GLushort *) rb->Data + 4 * (y[i] * rb->Width + x[i]);
         dst[0] = val0;
         dst[1] = val1;
         dst[2] = val2;
         dst[3] = val3;
      }
   }
}



/**
 * This is a software fallback for the gl_renderbuffer->AllocStorage
 * function.
 * Device drivers will typically override this function for the buffers
 * which it manages (typically color buffers, Z and stencil).
 * Other buffers (like software accumulation and aux buffers) which the driver
 * doesn't manage can be handled with this function.
 *
 * This one multi-purpose function can allocate stencil, depth, accum, color
 * or color-index buffers!
 *
 * This function also plugs in the appropriate GetPointer, Get/PutRow and
 * Get/PutValues functions.
 */
static GLboolean
soft_renderbuffer_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
                          GLenum internalFormat, GLuint width, GLuint height)
{
   GLuint pixelSize;

   switch (internalFormat) {
   case GL_RGB:
   case GL_R3_G3_B2:
   case GL_RGB4:
   case GL_RGB5:
   case GL_RGB8:
   case GL_RGB10:
   case GL_RGB12:
   case GL_RGB16:
      rb->_BaseFormat = GL_RGB;
      rb->DataType = GL_UNSIGNED_BYTE;
      rb->GetPointer = get_pointer_ubyte3;
      rb->GetRow = get_row_ubyte3;
      rb->GetValues = get_values_ubyte3;
      rb->PutRow = put_row_ubyte3;
      rb->PutRowRGB = put_row_rgb_ubyte3;
      rb->PutMonoRow = put_mono_row_ubyte3;
      rb->PutValues = put_values_ubyte3;
      rb->PutMonoValues = put_mono_values_ubyte3;
      rb->ComponentSizes[0] = 8 * sizeof(GLubyte);
      rb->ComponentSizes[1] = 8 * sizeof(GLubyte);
      rb->ComponentSizes[2] = 8 * sizeof(GLubyte);
      rb->ComponentSizes[3] = 0;
      pixelSize = 3 * sizeof(GLchan);
      break;