renderbuffer.c

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

      if (!mask || mask[i]) {
         GLuint *dst = (GLuint *) rb->Data + y[i] * rb->Width + x[i];
         *dst = val;
      }
   }
}


/**********************************************************************
 * Functions for buffers of 3 X GLubyte (or GLbyte) values.
 * Typically color buffers.
 * NOTE: the incoming and outgoing colors are RGBA!  We ignore incoming
 * alpha values and return 255 for outgoing alpha values.
 */

static void *
get_pointer_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb,
                   GLint x, GLint y)
{
   ASSERT(rb->_ActualFormat == GL_RGB8);
   /* No direct access since this buffer is RGB but caller will be
    * treating it as if it were RGBA.
    */
   return NULL;
}


static void
get_row_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
               GLint x, GLint y, void *values)
{
   const GLubyte *src = (const GLubyte *) rb->Data + 3 * (y * rb->Width + x);
   GLubyte *dst = (GLubyte *) values;
   GLuint i;
   ASSERT(rb->_ActualFormat == GL_RGB8);
   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; 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] = 255;
   }
}


static void
get_values_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                  const GLint x[], const GLint y[], void *values)
{
   GLubyte *dst = (GLubyte *) values;
   GLuint i;
   ASSERT(rb->_ActualFormat == GL_RGB8);
   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
   for (i = 0; i < count; i++) {
      const GLubyte *src
         = (GLubyte *) rb->Data + 3 * (y[i] * rb->Width + x[i]);
      dst[i * 4 + 0] = src[0];
      dst[i * 4 + 1] = src[1];
      dst[i * 4 + 2] = src[2];
      dst[i * 4 + 3] = 255;
   }
}


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->_ActualFormat == GL_RGB8);
   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->_ActualFormat == GL_RGB8);
   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->_ActualFormat == GL_RGB8);
   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->_ActualFormat == GL_RGB8);
   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->_ActualFormat == GL_RGB8);
   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);
   ASSERT(rb->_ActualFormat == GL_RGBA8);
   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 GLubyte *src = (const GLubyte *) rb->Data + 4 * (y * rb->Width + x);
   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
   ASSERT(rb->_ActualFormat == GL_RGBA8);
   _mesa_memcpy(values, src, 4 * count * sizeof(GLubyte));
}


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);
   ASSERT(rb->_ActualFormat == GL_RGBA8);
   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);
   ASSERT(rb->_ActualFormat == GL_RGBA8);
   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);
   ASSERT(rb->_ActualFormat == GL_RGBA8);
   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);
   ASSERT(rb->_ActualFormat == GL_RGBA8);
   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);
   ASSERT(rb->_ActualFormat == GL_RGBA8);
   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);
   ASSERT(rb->_ActualFormat == GL_RGBA8);
   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];