/*
* TODO: Optimize!!!!
*/
static void
copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
GLint width, GLint height,
GLint destx, GLint desty )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
struct gl_framebuffer *fb = ctx->ReadBuffer;
struct gl_renderbuffer *readRb = fb->_DepthBuffer;
const GLfloat depthMax = fb->_DepthMaxF;
GLfloat *p, *tmpImage;
GLint sy, dy, stepy;
GLint i, j;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
GLint overlapping;
struct sw_span span;
if (!readRb) {
/* no readbuffer - OK */
return;
}
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
/* Determine if copy should be bottom-to-top or top-to-bottom */
if (srcy<desty) {
/* top-down max-to-min */
sy = srcy + height - 1;
dy = desty + height - 1;
stepy = -1;
}
else {
/* bottom-up min-to-max */
sy = srcy;
dy = desty;
stepy = 1;
}
if (ctx->DrawBuffer == ctx->ReadBuffer) {
overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
}
else {
overlapping = GL_FALSE;
}
_swrast_span_default_color(ctx, &span);
if (swrast->_FogEnabled)
_swrast_span_default_fog(ctx, &span);
if (overlapping) {
GLint ssy = sy;
tmpImage = (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat));
if (!tmpImage) {
_mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
return;
}
p = tmpImage;
for (j = 0; j < height; j++, ssy += stepy) {
_swrast_read_depth_span_float(ctx, readRb, width, srcx, ssy, p);
p += width;
}
p = tmpImage;
}
else {
tmpImage = NULL; /* silence compiler warning */
p = NULL;
}
for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
GLfloat depth[MAX_WIDTH];
/* get depth values */
if (overlapping) {
_mesa_memcpy(depth, p, width * sizeof(GLfloat));
p += width;
}
else {
_swrast_read_depth_span_float(ctx, readRb, width, srcx, sy, depth);
}
/* apply scale and bias */
for (i = 0; i < width; i++) {
GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
span.array->z[i] = (GLuint) (CLAMP(d, 0.0F, 1.0F) * depthMax);
}
/* write depth values */
span.x = destx;
span.y = dy;
span.end = width;
if (fb->Visual.rgbMode) {
if (zoom)
_swrast_write_zoomed_rgba_span(ctx, destx, desty, &span,
(const GLchan (*)[4]) span.array->rgba);
else
_swrast_write_rgba_span(ctx, &span);
}
else {
if (zoom)
_swrast_write_zoomed_index_span(ctx, destx, desty, &span);
else
_swrast_write_index_span(ctx, &span);
}
}
if (overlapping)
_mesa_free(tmpImage);
}
/*
* Draw depth image.
*/
static void
draw_depth_pixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type,
const struct gl_pixelstore_attrib *unpack,
const GLvoid *pixels )
{
const GLboolean bias_or_scale = ctx->Pixel.DepthBias!=0.0 || ctx->Pixel.DepthScale!=1.0;
const GLboolean zoom = ctx->Pixel.ZoomX != 1.0 || ctx->Pixel.ZoomY != 1.0;
const GLint desty = y;
struct sw_span span;
INIT_SPAN(span, GL_BITMAP, 0, 0, SPAN_Z);
if (type != GL_BYTE
&& type != GL_UNSIGNED_BYTE
&& type != GL_SHORT
&& type != GL_UNSIGNED_SHORT
&& type != GL_INT
&& type != GL_UNSIGNED_INT
&& type != GL_FLOAT) {
_mesa_error(ctx, GL_INVALID_ENUM, "glDrawPixels(type)");
return;
}
_swrast_span_default_color(ctx, &span);
if (ctx->Fog.Enabled)
_swrast_span_default_fog(ctx, &span);
if (ctx->Texture._EnabledCoordUnits)
_swrast_span_default_texcoords(ctx, &span);
if (type == GL_UNSIGNED_SHORT
&& ctx->Visual.depthBits == 16
&& !bias_or_scale
&& !zoom
&& ctx->Visual.rgbMode
&& width <= MAX_WIDTH) {
/* Special case: directly write 16-bit depth values */
GLint row, spanY = y;
for (row = 0; row < height; row++, spanY++) {
const GLushort *zSrc = (const GLushort *)
_mesa_image_address2d(unpack, pixels, width, height,
GL_DEPTH_COMPONENT, type, row, 0);
GLint i;
for (i = 0; i < width; i++)
span.array->z[i] = zSrc[i];
span.x = x;
span.y = spanY;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else if (type == GL_UNSIGNED_INT
&& sizeof(GLdepth) == 4
&& !bias_or_scale
&& !zoom
&& ctx->Visual.rgbMode
&& width <= MAX_WIDTH) {
/* Special case: shift 32-bit values down to ctx->Visual.depthBits */
const GLint shift = 32 - ctx->Visual.depthBits;
GLint row, spanY = y;
for (row = 0; row < height; row++, spanY++) {
const GLuint *zSrc = (const GLuint *)
_mesa_image_address2d(unpack, pixels, width, height,
GL_DEPTH_COMPONENT, type, row, 0);
if (shift == 0) {
MEMCPY(span.array->z, zSrc, width * sizeof(GLdepth));
}
else {
GLint col;
for (col = 0; col < width; col++)
span.array->z[col] = zSrc[col] >> shift;
}
span.x = x;
span.y = spanY;
span.end = width;
_swrast_write_rgba_span(ctx, &span);
}
}
else {
