/**
* Zoom/write 32-bit Z values.
* No per-fragment operations are applied.
*/
void
_swrast_write_zoomed_z_span(struct gl_context *ctx, GLint imgX, GLint imgY,
GLint width, GLint spanX, GLint spanY,
const GLuint *zVals)
{
struct gl_renderbuffer *rb =
ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
GLuint zoomedVals[MAX_WIDTH];
GLint x0, x1, y0, y1, y;
GLint i, zoomedWidth;
if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width,
&x0, &x1, &y0, &y1)) {
return; /* totally clipped */
}
zoomedWidth = x1 - x0;
ASSERT(zoomedWidth > 0);
ASSERT(zoomedWidth <= MAX_WIDTH);
/* zoom the span horizontally */
for (i = 0; i < zoomedWidth; i++) {
GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX;
ASSERT(j >= 0);
ASSERT(j < width);
zoomedVals[i] = zVals[j];
}
/* write the zoomed spans */
for (y = y0; y < y1; y++) {
GLubyte *dst = _swrast_pixel_address(rb, x0, y);
_mesa_pack_uint_z_row(rb->Format, zoomedWidth, zoomedVals, dst);
}
}
/**
* Blit color, depth or stencil with GL_NEAREST filtering.
*/
static void
blit_nearest(struct gl_context *ctx,
GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
GLbitfield buffer)
{
struct gl_renderbuffer *readRb, *drawRb;
const GLint srcWidth = ABS(srcX1 - srcX0);
const GLint dstWidth = ABS(dstX1 - dstX0);
const GLint srcHeight = ABS(srcY1 - srcY0);
const GLint dstHeight = ABS(dstY1 - dstY0);
const GLint srcXpos = MIN2(srcX0, srcX1);
const GLint srcYpos = MIN2(srcY0, srcY1);
const GLint dstXpos = MIN2(dstX0, dstX1);
const GLint dstYpos = MIN2(dstY0, dstY1);
const GLboolean invertX = (srcX1 < srcX0) ^ (dstX1 < dstX0);
const GLboolean invertY = (srcY1 < srcY0) ^ (dstY1 < dstY0);
enum mode {
DIRECT,
UNPACK_RGBA_FLOAT,
UNPACK_Z_FLOAT,
UNPACK_Z_INT,
UNPACK_S,
} mode;
GLubyte *srcMap, *dstMap;
GLint srcRowStride, dstRowStride;
GLint dstRow;
GLint pixelSize;
GLvoid *srcBuffer, *dstBuffer;
GLint prevY = -1;
typedef void (*resample_func)(GLint srcWidth, GLint dstWidth,
const GLvoid *srcBuffer, GLvoid *dstBuffer,
GLboolean flip);
resample_func resampleRow;
switch (buffer) {
case GL_COLOR_BUFFER_BIT:
readRb = ctx->ReadBuffer->_ColorReadBuffer;
drawRb = ctx->DrawBuffer->_ColorDrawBuffers[0];
if (readRb->Format == drawRb->Format) {
mode = DIRECT;
pixelSize = _mesa_get_format_bytes(readRb->Format);
} else {
mode = UNPACK_RGBA_FLOAT;
pixelSize = 16;
}
break;
case GL_DEPTH_BUFFER_BIT:
readRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
drawRb = ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer;
/* Note that for depth/stencil, the formats of src/dst must match. By
* using the core helpers for pack/unpack, we avoid needing to handle
* masking for things like DEPTH copies of Z24S8.
*/
if (readRb->Format == MESA_FORMAT_Z32_FLOAT ||
readRb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
mode = UNPACK_Z_FLOAT;
} else {
mode = UNPACK_Z_INT;
}
pixelSize = 4;
break;
case GL_STENCIL_BUFFER_BIT:
readRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
drawRb = ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer;
mode = UNPACK_S;
pixelSize = 1;
break;
default:
_mesa_problem(ctx, "unexpected buffer in blit_nearest()");
return;
}
/* choose row resampler */
switch (pixelSize) {
case 1:
resampleRow = resample_row_1;
break;
case 2:
resampleRow = resample_row_2;
break;
case 4:
resampleRow = resample_row_4;
break;
case 8:
resampleRow = resample_row_8;
break;
case 16:
resampleRow = resample_row_16;
break;
default:
_mesa_problem(ctx, "unexpected pixel size (%d) in blit_nearest",
pixelSize);
return;
}
if (readRb == drawRb) {
/* map whole buffer for read/write */
/* XXX we could be clever and just map the union region of the
* source and dest rects.
*/
GLubyte *map;
GLint rowStride;
GLint formatSize = _mesa_get_format_bytes(readRb->Format);
ctx->Driver.MapRenderbuffer(ctx, readRb, 0, 0,
readRb->Width, readRb->Height,
GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
&map, &rowStride);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFramebuffer");
return;
}
srcMap = map + srcYpos * rowStride + srcXpos * formatSize;
dstMap = map + dstYpos * rowStride + dstXpos * formatSize;
/* this handles overlapping copies */
if (srcY0 < dstY0) {
/* copy in reverse (top->down) order */
srcMap += rowStride * (readRb->Height - 1);
dstMap += rowStride * (readRb->Height - 1);
srcRowStride = -rowStride;
dstRowStride = -rowStride;
}
else {
/* copy in normal (bottom->up) order */
srcRowStride = rowStride;
dstRowStride = rowStride;
}
}
else {
/* different src/dst buffers */
ctx->Driver.MapRenderbuffer(ctx, readRb,
srcXpos, srcYpos,
srcWidth, srcHeight,
GL_MAP_READ_BIT, &srcMap, &srcRowStride);
if (!srcMap) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFramebuffer");
return;
}
ctx->Driver.MapRenderbuffer(ctx, drawRb,
dstXpos, dstYpos,
dstWidth, dstHeight,
GL_MAP_WRITE_BIT, &dstMap, &dstRowStride);
if (!dstMap) {
ctx->Driver.UnmapRenderbuffer(ctx, readRb);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFramebuffer");
return;
}
}
/* allocate the src/dst row buffers */
srcBuffer = malloc(pixelSize * srcWidth);
if (!srcBuffer) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
return;
}
dstBuffer = malloc(pixelSize * dstWidth);
if (!dstBuffer) {
free(srcBuffer);
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glBlitFrameBufferEXT");
return;
}
for (dstRow = 0; dstRow < dstHeight; dstRow++) {
GLint srcRow = (dstRow * srcHeight) / dstHeight;
GLubyte *dstRowStart = dstMap + dstRowStride * dstRow;
ASSERT(srcRow >= 0);
ASSERT(srcRow < srcHeight);
if (invertY) {
srcRow = srcHeight - 1 - srcRow;
}
/* get pixel row from source and resample to match dest width */
if (prevY != srcRow) {
GLubyte *srcRowStart = srcMap + srcRowStride * srcRow;
switch (mode) {
case DIRECT:
memcpy(srcBuffer, srcRowStart, pixelSize * srcWidth);
break;
case UNPACK_RGBA_FLOAT:
_mesa_unpack_rgba_row(readRb->Format, srcWidth, srcRowStart,
srcBuffer);
break;
case UNPACK_Z_FLOAT:
_mesa_unpack_float_z_row(readRb->Format, srcWidth, srcRowStart,
srcBuffer);
break;
case UNPACK_Z_INT:
_mesa_unpack_uint_z_row(readRb->Format, srcWidth, srcRowStart,
srcBuffer);
break;
case UNPACK_S:
_mesa_unpack_ubyte_stencil_row(readRb->Format, srcWidth,
srcRowStart, srcBuffer);
break;
}
(*resampleRow)(srcWidth, dstWidth, srcBuffer, dstBuffer, invertX);
prevY = srcRow;
}
/* store pixel row in destination */
switch (mode) {
case DIRECT:
memcpy(dstRowStart, dstBuffer, pixelSize * srcWidth);
break;
case UNPACK_RGBA_FLOAT:
_mesa_pack_float_rgba_row(drawRb->Format, dstWidth, dstBuffer,
dstRowStart);
break;
case UNPACK_Z_FLOAT:
_mesa_pack_float_z_row(drawRb->Format, dstWidth, dstBuffer,
dstRowStart);
break;
case UNPACK_Z_INT:
_mesa_pack_uint_z_row(drawRb->Format, dstWidth, dstBuffer,
dstRowStart);
break;
case UNPACK_S:
_mesa_pack_ubyte_stencil_row(drawRb->Format, dstWidth, dstBuffer,
dstRowStart);
break;
}
}
free(srcBuffer);
free(dstBuffer);
ctx->Driver.UnmapRenderbuffer(ctx, readRb);
if (drawRb != readRb) {
ctx->Driver.UnmapRenderbuffer(ctx, drawRb);
}
}
