/*
* Mesa 3-D graphics library
- * Version: 7.1
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
*/
#include "glheader.h"
#include "imports.h"
+#include "blend.h"
#include "bufferobj.h"
#include "context.h"
#include "enums.h"
* Return true if the conversion L=R+G+B is needed.
*/
static GLboolean
-need_rgb_to_luminance_conversion(gl_format texFormat, GLenum format)
+need_rgb_to_luminance_conversion(mesa_format texFormat, GLenum format)
{
GLenum baseTexFormat = _mesa_get_format_base_format(texFormat);
* Return transfer op flags for this ReadPixels operation.
*/
static GLbitfield
-get_readpixels_transfer_ops(const struct gl_context *ctx, gl_format texFormat,
+get_readpixels_transfer_ops(const struct gl_context *ctx, mesa_format texFormat,
GLenum format, GLenum type, GLboolean uses_blit)
{
GLbitfield transferOps = ctx->_ImageTransferState;
if (uses_blit) {
/* For blit-based ReadPixels packing, the clamping is done automatically
* unless the type is float. */
- if (ctx->Color._ClampReadColor == GL_TRUE &&
+ if (_mesa_get_clamp_read_color(ctx) &&
(type == GL_FLOAT || type == GL_HALF_FLOAT)) {
transferOps |= IMAGE_CLAMP_BIT;
}
else {
/* For CPU-based ReadPixels packing, the clamping must always be done
* for non-float types, */
- if (ctx->Color._ClampReadColor == GL_TRUE ||
+ if (_mesa_get_clamp_read_color(ctx) ||
(type != GL_FLOAT && type != GL_HALF_FLOAT)) {
transferOps |= IMAGE_CLAMP_BIT;
}
/**
- * Tries to implement glReadPixels() of GL_DEPTH_COMPONENT using memcpy of the
- * mapping.
+ * Return true if memcpy cannot be used for ReadPixels.
+ *
+ * If uses_blit is true, the function returns true if a simple 3D engine blit
+ * cannot be used for ReadPixels packing.
+ *
+ * NOTE: This doesn't take swizzling and format conversions between
+ * the readbuffer and the pixel pack buffer into account.
*/
+GLboolean
+_mesa_readpixels_needs_slow_path(const struct gl_context *ctx, GLenum format,
+ GLenum type, GLboolean uses_blit)
+{
+ struct gl_renderbuffer *rb =
+ _mesa_get_read_renderbuffer_for_format(ctx, format);
+ GLenum srcType;
+
+ ASSERT(rb);
+
+ /* There are different rules depending on the base format. */
+ switch (format) {
+ case GL_DEPTH_STENCIL:
+ return !_mesa_has_depthstencil_combined(ctx->ReadBuffer) ||
+ ctx->Pixel.DepthScale != 1.0f || ctx->Pixel.DepthBias != 0.0f ||
+ ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset ||
+ ctx->Pixel.MapStencilFlag;
+
+ case GL_DEPTH_COMPONENT:
+ return ctx->Pixel.DepthScale != 1.0f || ctx->Pixel.DepthBias != 0.0f;
+
+ case GL_STENCIL_INDEX:
+ return ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset ||
+ ctx->Pixel.MapStencilFlag;
+
+ default:
+ /* Color formats. */
+ if (need_rgb_to_luminance_conversion(rb->Format, format)) {
+ return GL_TRUE;
+ }
+
+ /* Conversion between signed and unsigned integers needs masking
+ * (it isn't just memcpy). */
+ srcType = _mesa_get_format_datatype(rb->Format);
+
+ if ((srcType == GL_INT &&
+ (type == GL_UNSIGNED_INT ||
+ type == GL_UNSIGNED_SHORT ||
+ type == GL_UNSIGNED_BYTE)) ||
+ (srcType == GL_UNSIGNED_INT &&
+ (type == GL_INT ||
+ type == GL_SHORT ||
+ type == GL_BYTE))) {
+ return GL_TRUE;
+ }
+
+ /* And finally, see if there are any transfer ops. */
+ return get_readpixels_transfer_ops(ctx, rb->Format, format, type,
+ uses_blit) != 0;
+ }
+ return GL_FALSE;
+}
+
+
+static GLboolean
+readpixels_can_use_memcpy(const struct gl_context *ctx, GLenum format, GLenum type,
+ const struct gl_pixelstore_attrib *packing)
+{
+ struct gl_renderbuffer *rb =
+ _mesa_get_read_renderbuffer_for_format(ctx, format);
+
+ ASSERT(rb);
+
+ if (_mesa_readpixels_needs_slow_path(ctx, format, type, GL_FALSE)) {
+ return GL_FALSE;
+ }
+
+ /* The base internal format and the base Mesa format must match. */
+ if (rb->_BaseFormat != _mesa_get_format_base_format(rb->Format)) {
+ return GL_FALSE;
+ }
+
+ /* The Mesa format must match the input format and type. */
+ if (!_mesa_format_matches_format_and_type(rb->Format, format, type,
+ packing->SwapBytes)) {
+ return GL_FALSE;
+ }
+
+ return GL_TRUE;
+}
+
+
static GLboolean
-fast_read_depth_pixels( struct gl_context *ctx,
+readpixels_memcpy(struct gl_context *ctx,
+ GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ GLvoid *pixels,
+ const struct gl_pixelstore_attrib *packing)
+{
+ struct gl_renderbuffer *rb =
+ _mesa_get_read_renderbuffer_for_format(ctx, format);
+ GLubyte *dst, *map;
+ int dstStride, stride, j, texelBytes;
+
+ /* Fail if memcpy cannot be used. */
+ if (!readpixels_can_use_memcpy(ctx, format, type, packing)) {
+ return GL_FALSE;
+ }
+
+ dstStride = _mesa_image_row_stride(packing, width, format, type);
+ dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
+ format, type, 0, 0);
+
+ ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
+ &map, &stride);
+ if (!map) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
+ return GL_TRUE; /* don't bother trying the slow path */
+ }
+
+ texelBytes = _mesa_get_format_bytes(rb->Format);
+
+ /* memcpy*/
+ for (j = 0; j < height; j++) {
+ memcpy(dst, map, width * texelBytes);
+ dst += dstStride;
+ map += stride;
+ }
+
+ ctx->Driver.UnmapRenderbuffer(ctx, rb);
+ return GL_TRUE;
+}
+
+
+/**
+ * Optimized path for conversion of depth values to GL_DEPTH_COMPONENT,
+ * GL_UNSIGNED_INT.
+ */
+static GLboolean
+read_uint_depth_pixels( struct gl_context *ctx,
GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum type, GLvoid *pixels,
if (_mesa_get_format_datatype(rb->Format) != GL_UNSIGNED_NORMALIZED)
return GL_FALSE;
- if (!((type == GL_UNSIGNED_SHORT && rb->Format == MESA_FORMAT_Z16) ||
- type == GL_UNSIGNED_INT))
- return GL_FALSE;
-
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
&map, &stride);
GL_DEPTH_COMPONENT, type, 0, 0);
for (j = 0; j < height; j++) {
- if (type == GL_UNSIGNED_INT) {
- _mesa_unpack_uint_z_row(rb->Format, width, map, (GLuint *)dst);
- } else {
- ASSERT(type == GL_UNSIGNED_SHORT && rb->Format == MESA_FORMAT_Z16);
- memcpy(dst, map, width * 2);
- }
+ _mesa_unpack_uint_z_row(rb->Format, width, map, (GLuint *)dst);
map += stride;
dst += dstStride;
ASSERT(x + width <= (GLint) rb->Width);
ASSERT(y + height <= (GLint) rb->Height);
- if (fast_read_depth_pixels(ctx, x, y, width, height, type, pixels, packing))
+ if (type == GL_UNSIGNED_INT &&
+ read_uint_depth_pixels(ctx, x, y, width, height, type, pixels, packing)) {
return;
+ }
dstStride = _mesa_image_row_stride(packing, width, GL_DEPTH_COMPONENT, type);
dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
/**
- * Try to do glReadPixels of RGBA data using a simple memcpy or swizzle.
+ * Try to do glReadPixels of RGBA data using swizzle.
* \return GL_TRUE if successful, GL_FALSE otherwise (use the slow path)
*/
static GLboolean
-fast_read_rgba_pixels_memcpy( struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum format, GLenum type,
- GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing)
+read_rgba_pixels_swizzle(struct gl_context *ctx,
+ GLint x, GLint y,
+ GLsizei width, GLsizei height,
+ GLenum format, GLenum type,
+ GLvoid *pixels,
+ const struct gl_pixelstore_attrib *packing)
{
struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
GLubyte *dst, *map;
- int dstStride, stride, j, texelBytes;
+ int dstStride, stride, j;
GLboolean swizzle_rb = GL_FALSE, copy_xrgb = GL_FALSE;
/* XXX we could check for other swizzle/special cases here as needed */
- if (rb->Format == MESA_FORMAT_RGBA8888_REV &&
+ if (rb->Format == MESA_FORMAT_R8G8B8A8_UNORM &&
format == GL_BGRA &&
type == GL_UNSIGNED_INT_8_8_8_8_REV &&
!ctx->Pack.SwapBytes) {
swizzle_rb = GL_TRUE;
}
- else if (rb->Format == MESA_FORMAT_XRGB8888 &&
+ else if (rb->Format == MESA_FORMAT_B8G8R8X8_UNORM &&
format == GL_BGRA &&
type == GL_UNSIGNED_INT_8_8_8_8_REV &&
!ctx->Pack.SwapBytes) {
copy_xrgb = GL_TRUE;
}
- else if (!_mesa_format_matches_format_and_type(rb->Format, format, type,
- ctx->Pack.SwapBytes))
+ else {
return GL_FALSE;
+ }
dstStride = _mesa_image_row_stride(packing, width, format, type);
dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
return GL_TRUE; /* don't bother trying the slow path */
}
- texelBytes = _mesa_get_format_bytes(rb->Format);
-
if (swizzle_rb) {
/* swap R/B */
for (j = 0; j < height; j++) {
dst += dstStride;
map += stride;
}
- } else {
- /* just memcpy */
- for (j = 0; j < height; j++) {
- memcpy(dst, map, width * texelBytes);
- dst += dstStride;
- map += stride;
- }
}
ctx->Driver.UnmapRenderbuffer(ctx, rb);
GLbitfield transferOps )
{
struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
- const gl_format rbFormat = _mesa_get_srgb_format_linear(rb->Format);
+ const mesa_format rbFormat = _mesa_get_srgb_format_linear(rb->Format);
void *rgba;
GLubyte *dst, *map;
int dstStride, stride, j;
/* Try the optimized paths first. */
if (!transferOps &&
- fast_read_rgba_pixels_memcpy(ctx, x, y, width, height,
+ read_rgba_pixels_swizzle(ctx, x, y, width, height,
format, type, pixels, packing)) {
return;
}
if (rb != stencilRb)
return GL_FALSE;
- if (rb->Format != MESA_FORMAT_Z24_S8 &&
- rb->Format != MESA_FORMAT_S8_Z24)
+ if (rb->Format != MESA_FORMAT_S8_UINT_Z24_UNORM &&
+ rb->Format != MESA_FORMAT_Z24_UNORM_X8_UINT)
return GL_FALSE;
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
pixels = _mesa_map_pbo_dest(ctx, &clippedPacking, pixels);
if (pixels) {
+ /* Try memcpy first. */
+ if (readpixels_memcpy(ctx, x, y, width, height, format, type,
+ pixels, packing)) {
+ _mesa_unmap_pbo_dest(ctx, &clippedPacking);
+ return;
+ }
+
+ /* Otherwise take the slow path. */
switch (format) {
case GL_STENCIL_INDEX:
read_stencil_pixels(ctx, x, y, width, height, type, pixels,
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