/*
* 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"
#include "pack.h"
#include "pbo.h"
#include "state.h"
+#include "glformats.h"
+#include "fbobject.h"
+#include "format_utils.h"
+#include "pixeltransfer.h"
/**
- * Tries to implement glReadPixels() of GL_DEPTH_COMPONENT using memcpy of the
- * mapping.
+ * Return true if the conversion L=R+G+B is needed.
*/
static GLboolean
-fast_read_depth_pixels( struct gl_context *ctx,
+need_rgb_to_luminance_conversion(mesa_format texFormat, GLenum format)
+{
+ GLenum baseTexFormat = _mesa_get_format_base_format(texFormat);
+
+ return (baseTexFormat == GL_RG ||
+ baseTexFormat == GL_RGB ||
+ baseTexFormat == GL_RGBA) &&
+ (format == GL_LUMINANCE ||
+ format == GL_LUMINANCE_ALPHA ||
+ format == GL_LUMINANCE_INTEGER_EXT ||
+ format == GL_LUMINANCE_ALPHA_INTEGER_EXT);
+}
+
+
+/**
+ * Return transfer op flags for this ReadPixels operation.
+ */
+static GLbitfield
+get_readpixels_transfer_ops(const struct gl_context *ctx, mesa_format texFormat,
+ GLenum format, GLenum type, GLboolean uses_blit)
+{
+ GLbitfield transferOps = ctx->_ImageTransferState;
+
+ if (format == GL_DEPTH_COMPONENT ||
+ format == GL_DEPTH_STENCIL ||
+ format == GL_STENCIL_INDEX) {
+ return 0;
+ }
+
+ /* Pixel transfer ops (scale, bias, table lookup) do not apply
+ * to integer formats.
+ */
+ if (_mesa_is_enum_format_integer(format)) {
+ return 0;
+ }
+
+ if (uses_blit) {
+ /* For blit-based ReadPixels packing, the clamping is done automatically
+ * unless the type is float. */
+ if (_mesa_get_clamp_read_color(ctx, ctx->ReadBuffer) &&
+ (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 (_mesa_get_clamp_read_color(ctx, ctx->ReadBuffer) ||
+ (type != GL_FLOAT && type != GL_HALF_FLOAT)) {
+ transferOps |= IMAGE_CLAMP_BIT;
+ }
+ }
+
+ /* If the format is unsigned normalized, we can ignore clamping
+ * because the values are already in the range [0,1] so it won't
+ * have any effect anyway.
+ */
+ if (_mesa_get_format_datatype(texFormat) == GL_UNSIGNED_NORMALIZED &&
+ !need_rgb_to_luminance_conversion(texFormat, format)) {
+ transferOps &= ~IMAGE_CLAMP_BIT;
+ }
+
+ return transferOps;
+}
+
+
+/**
+ * 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
+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;
return;
/* clipping should have been done already */
- ASSERT(x >= 0);
- ASSERT(y >= 0);
- ASSERT(x + width <= (GLint) rb->Width);
- ASSERT(y + height <= (GLint) rb->Height);
+ assert(x >= 0);
+ assert(y >= 0);
+ 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,
return;
}
- depthValues = (GLfloat *) malloc(width * sizeof(GLfloat));
+ depthValues = malloc(width * sizeof(GLfloat));
if (depthValues) {
/* General case (slower) */
return;
}
- stencil = (GLubyte *) malloc(width * sizeof(GLubyte));
+ stencil = malloc(width * sizeof(GLubyte));
if (stencil) {
/* process image row by row */
ctx->Driver.UnmapRenderbuffer(ctx, rb);
}
-
-/**
- * Try to do glReadPixels of RGBA data using a simple memcpy or swizzle.
- * \return GL_TRUE if successful, GL_FALSE otherwise (use the slow path)
+/*
+ * Read R, G, B, A, RGB, L, or LA pixels.
*/
-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,
- GLbitfield transferOps )
+static void
+read_rgba_pixels( 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;
+ GLbitfield transferOps;
+ bool dst_is_integer, convert_rgb_to_lum, needs_rebase;
+ int dst_stride, src_stride, rb_stride;
+ uint32_t dst_format, src_format;
GLubyte *dst, *map;
- int dstStride, stride, j, texelBytes;
- 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 &&
- 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 &&
- 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))
- return GL_FALSE;
-
- /* If the format is unsigned normalized then we can ignore clamping
- * because the values are already in the range [0,1] so it won't
- * have any effect anyway.
- */
- if (_mesa_get_format_datatype(rb->Format) == GL_UNSIGNED_NORMALIZED)
- transferOps &= ~IMAGE_CLAMP_BIT;
+ mesa_format rb_format;
+ bool needs_rgba;
+ void *rgba, *src;
+ bool src_is_uint = false;
+ uint8_t rebase_swizzle[4];
+ struct gl_framebuffer *fb = ctx->ReadBuffer;
+ struct gl_renderbuffer *rb = fb->_ColorReadBuffer;
- if (transferOps)
- return GL_FALSE;
+ if (!rb)
+ return;
- dstStride = _mesa_image_row_stride(packing, width, format, type);
+ transferOps = get_readpixels_transfer_ops(ctx, rb->Format, format, type,
+ GL_FALSE);
+ /* Describe the dst format */
+ dst_is_integer = _mesa_is_enum_format_integer(format);
+ dst_stride = _mesa_image_row_stride(packing, width, format, type);
+ dst_format = _mesa_format_from_format_and_type(format, type);
+ convert_rgb_to_lum = need_rgb_to_luminance_conversion(rb->Format, format);
dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
- format, type, 0, 0);
+ format, type, 0, 0);
+ /* Map the source render buffer */
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
- &map, &stride);
+ &map, &rb_stride);
if (!map) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
- return GL_TRUE; /* don't bother trying the slow path */
+ return;
}
+ rb_format = _mesa_get_srgb_format_linear(rb->Format);
- texelBytes = _mesa_get_format_bytes(rb->Format);
+ /*
+ * Depending on the base formats involved in the conversion we might need to
+ * rebase some values, so for these formats we compute a rebase swizzle.
+ */
+ if (rb->_BaseFormat == GL_LUMINANCE || rb->_BaseFormat == GL_INTENSITY) {
+ needs_rebase = true;
+ rebase_swizzle[0] = MESA_FORMAT_SWIZZLE_X;
+ rebase_swizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
+ rebase_swizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
+ rebase_swizzle[3] = MESA_FORMAT_SWIZZLE_ONE;
+ } else if (rb->_BaseFormat == GL_LUMINANCE_ALPHA) {
+ needs_rebase = true;
+ rebase_swizzle[0] = MESA_FORMAT_SWIZZLE_X;
+ rebase_swizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
+ rebase_swizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
+ rebase_swizzle[3] = MESA_FORMAT_SWIZZLE_W;
+ } else if (_mesa_get_format_base_format(rb_format) != rb->_BaseFormat) {
+ needs_rebase =
+ _mesa_compute_rgba2base2rgba_component_mapping(rb->_BaseFormat,
+ rebase_swizzle);
+ } else {
+ needs_rebase = false;
+ }
- if (swizzle_rb) {
- /* swap R/B */
- for (j = 0; j < height; j++) {
- int i;
- for (i = 0; i < width; i++) {
- GLuint *dst4 = (GLuint *) dst, *map4 = (GLuint *) map;
- GLuint pixel = map4[i];
- dst4[i] = (pixel & 0xff00ff00)
- | ((pixel & 0x00ff0000) >> 16)
- | ((pixel & 0x000000ff) << 16);
+ /* Since _mesa_format_convert does not handle transferOps we need to handle
+ * them before we call the function. This requires to convert to RGBA float
+ * first so we can call _mesa_apply_rgba_transfer_ops. If the dst format is
+ * integer transferOps do not apply.
+ *
+ * Converting to luminance also requires converting to RGBA first, so we can
+ * then compute luminance values as L=R+G+B. Notice that this is different
+ * from GetTexImage, where we compute L=R.
+ */
+ assert(!transferOps || (transferOps && !dst_is_integer));
+
+ needs_rgba = transferOps || convert_rgb_to_lum;
+ rgba = NULL;
+ if (needs_rgba) {
+ uint32_t rgba_format;
+ int rgba_stride;
+ bool need_convert;
+
+ /* Convert to RGBA float or int/uint depending on the type of the src */
+ if (dst_is_integer) {
+ src_is_uint = _mesa_is_format_unsigned(rb_format);
+ if (src_is_uint) {
+ rgba_format = RGBA32_UINT;
+ rgba_stride = width * 4 * sizeof(GLuint);
+ } else {
+ rgba_format = RGBA32_INT;
+ rgba_stride = width * 4 * sizeof(GLint);
}
- dst += dstStride;
- map += stride;
+ } else {
+ rgba_format = RGBA32_FLOAT;
+ rgba_stride = width * 4 * sizeof(GLfloat);
}
- } else if (copy_xrgb) {
- /* convert xrgb -> argb */
- for (j = 0; j < height; j++) {
- GLuint *dst4 = (GLuint *) dst, *map4 = (GLuint *) map;
- int i;
- for (i = 0; i < width; i++) {
- dst4[i] = map4[i] | 0xff000000; /* set A=0xff */
+
+ /* If we are lucky and the dst format matches the RGBA format we need to
+ * convert to, then we can convert directly into the dst buffer and avoid
+ * the final conversion/copy from the rgba buffer to the dst buffer.
+ */
+ if (dst_format == rgba_format) {
+ need_convert = false;
+ rgba = dst;
+ } else {
+ need_convert = true;
+ rgba = malloc(height * rgba_stride);
+ if (!rgba) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
+ goto done_unmap;
}
- dst += dstStride;
- map += stride;
}
+
+ /* Convert to RGBA now */
+ _mesa_format_convert(rgba, rgba_format, rgba_stride,
+ map, rb_format, rb_stride,
+ width, height,
+ needs_rebase ? rebase_swizzle : NULL);
+
+ /* Handle transfer ops if necessary */
+ if (transferOps)
+ _mesa_apply_rgba_transfer_ops(ctx, transferOps, width * height, rgba);
+
+ /* If we had to rebase, we have already taken care of that */
+ needs_rebase = false;
+
+ /* If we were lucky and our RGBA conversion matches the dst format, then
+ * we are done.
+ */
+ if (!need_convert)
+ goto done_swap;
+
+ /* Otherwise, we need to convert from RGBA to dst next */
+ src = rgba;
+ src_format = rgba_format;
+ src_stride = rgba_stride;
} else {
- /* just memcpy */
- for (j = 0; j < height; j++) {
- memcpy(dst, map, width * texelBytes);
- dst += dstStride;
- map += stride;
- }
+ /* No RGBA conversion needed, convert directly to dst */
+ src = map;
+ src_format = rb_format;
+ src_stride = rb_stride;
}
- ctx->Driver.UnmapRenderbuffer(ctx, rb);
-
- return GL_TRUE;
-}
-
-static void
-slow_read_rgba_pixels( struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum format, GLenum type,
- GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing,
- GLbitfield transferOps )
-{
- struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
- const gl_format rbFormat = _mesa_get_srgb_format_linear(rb->Format);
- void *rgba;
- GLubyte *dst, *map;
- int dstStride, stride, j;
-
- 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;
+ /* Do the conversion.
+ *
+ * If the dst format is Luminance, we need to do the conversion by computing
+ * L=R+G+B values.
+ */
+ if (!convert_rgb_to_lum) {
+ _mesa_format_convert(dst, dst_format, dst_stride,
+ src, src_format, src_stride,
+ width, height,
+ needs_rebase ? rebase_swizzle : NULL);
+ } else if (!dst_is_integer) {
+ /* Compute float Luminance values from RGBA float */
+ int luminance_stride, luminance_bytes;
+ void *luminance;
+ uint32_t luminance_format;
+
+ luminance_stride = width * sizeof(GL_FLOAT);
+ if (format == GL_LUMINANCE_ALPHA)
+ luminance_stride *= 2;
+ luminance_bytes = height * luminance_stride;
+ luminance = malloc(luminance_bytes);
+ if (!luminance) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels");
+ free(rgba);
+ goto done_unmap;
+ }
+ _mesa_pack_luminance_from_rgba_float(width * height, src,
+ luminance, format, transferOps);
+
+ /* Convert from Luminance float to dst (this will hadle type conversion
+ * from float to the type of dst if necessary)
+ */
+ luminance_format = _mesa_format_from_format_and_type(format, GL_FLOAT);
+ _mesa_format_convert(dst, dst_format, dst_stride,
+ luminance, luminance_format, luminance_stride,
+ width, height, NULL);
+ free(luminance);
+ } else {
+ _mesa_pack_luminance_from_rgba_integer(width * height, src, !src_is_uint,
+ dst, format, type);
}
- rgba = malloc(width * MAX_PIXEL_BYTES);
- if (!rgba)
- goto done;
-
- for (j = 0; j < height; j++) {
- if (_mesa_is_integer_format(format)) {
- _mesa_unpack_uint_rgba_row(rbFormat, width, map, (GLuint (*)[4]) rgba);
- _mesa_rebase_rgba_uint(width, (GLuint (*)[4]) rgba,
- rb->_BaseFormat);
- _mesa_pack_rgba_span_int(ctx, width, (GLuint (*)[4]) rgba, format,
- type, dst);
- } else {
- _mesa_unpack_rgba_row(rbFormat, width, map, (GLfloat (*)[4]) rgba);
- _mesa_rebase_rgba_float(width, (GLfloat (*)[4]) rgba,
- rb->_BaseFormat);
- _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba, format,
- type, dst, packing, transferOps);
+ if (rgba)
+ free(rgba);
+
+done_swap:
+ /* Handle byte swapping if required */
+ if (packing->SwapBytes) {
+ GLint swapSize = _mesa_sizeof_packed_type(type);
+ if (swapSize == 2 || swapSize == 4) {
+ int swapsPerPixel = _mesa_bytes_per_pixel(format, type) / swapSize;
+ assert(_mesa_bytes_per_pixel(format, type) % swapSize == 0);
+ if (swapSize == 2)
+ _mesa_swap2((GLushort *) dst, width * height * swapsPerPixel);
+ else if (swapSize == 4)
+ _mesa_swap4((GLuint *) dst, width * height * swapsPerPixel);
}
- dst += dstStride;
- map += stride;
}
- free(rgba);
-
-done:
+done_unmap:
ctx->Driver.UnmapRenderbuffer(ctx, rb);
}
-/*
- * Read R, G, B, A, RGB, L, or LA pixels.
- */
-static void
-read_rgba_pixels( struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum format, GLenum type, GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing )
-{
- GLbitfield transferOps = ctx->_ImageTransferState;
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct gl_renderbuffer *rb = fb->_ColorReadBuffer;
-
- if (!rb)
- return;
-
- if ((ctx->Color._ClampReadColor == GL_TRUE || type != GL_FLOAT) &&
- !_mesa_is_integer_format(format)) {
- transferOps |= IMAGE_CLAMP_BIT;
- }
-
- /* Try the optimized paths first. */
- if (fast_read_rgba_pixels_memcpy(ctx, x, y, width, height,
- format, type, pixels, packing,
- transferOps)) {
- return;
- }
-
- slow_read_rgba_pixels(ctx, x, y, width, height,
- format, type, pixels, packing, transferOps);
-}
-
/**
* For a packed depth/stencil buffer being read as depth/stencil, just memcpy the
* data (possibly swapping 8/24 vs 24/8 as we go).
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_S8_UINT)
return GL_FALSE;
ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
return GL_TRUE; /* don't bother trying the slow path */
}
- stencilVals = (GLubyte *) malloc(width * sizeof(GLubyte));
+ stencilVals = malloc(width * sizeof(GLubyte));
if (stencilVals) {
for (j = 0; j < height; j++) {
stencilStride = depthStride;
}
- stencilVals = (GLubyte *) malloc(width * sizeof(GLubyte));
- depthVals = (GLfloat *) malloc(width * sizeof(GLfloat));
+ stencilVals = malloc(width * sizeof(GLubyte));
+ depthVals = malloc(width * sizeof(GLfloat));
if (stencilVals && depthVals) {
for (j = 0; j < height; j++) {
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,
}
+static GLenum
+read_pixels_es3_error_check(GLenum format, GLenum type,
+ const struct gl_renderbuffer *rb)
+{
+ const GLenum internalFormat = rb->InternalFormat;
+ const GLenum data_type = _mesa_get_format_datatype(rb->Format);
+ GLboolean is_unsigned_int = GL_FALSE;
+ GLboolean is_signed_int = GL_FALSE;
+
+ if (!_mesa_is_color_format(internalFormat)) {
+ return GL_INVALID_OPERATION;
+ }
+
+ is_unsigned_int = _mesa_is_enum_format_unsigned_int(internalFormat);
+ if (!is_unsigned_int) {
+ is_signed_int = _mesa_is_enum_format_signed_int(internalFormat);
+ }
+
+ switch (format) {
+ case GL_RGBA:
+ if (type == GL_FLOAT && data_type == GL_FLOAT)
+ return GL_NO_ERROR; /* EXT_color_buffer_float */
+ if (type == GL_UNSIGNED_BYTE && data_type == GL_UNSIGNED_NORMALIZED)
+ return GL_NO_ERROR;
+ if (internalFormat == GL_RGB10_A2 &&
+ type == GL_UNSIGNED_INT_2_10_10_10_REV)
+ return GL_NO_ERROR;
+ if (internalFormat == GL_RGB10_A2UI && type == GL_UNSIGNED_BYTE)
+ return GL_NO_ERROR;
+ break;
+ case GL_BGRA:
+ /* GL_EXT_read_format_bgra */
+ if (type == GL_UNSIGNED_BYTE ||
+ type == GL_UNSIGNED_SHORT_4_4_4_4_REV ||
+ type == GL_UNSIGNED_SHORT_1_5_5_5_REV)
+ return GL_NO_ERROR;
+ break;
+ case GL_RGBA_INTEGER:
+ if ((is_signed_int && type == GL_INT) ||
+ (is_unsigned_int && type == GL_UNSIGNED_INT))
+ return GL_NO_ERROR;
+ break;
+ }
+
+ return GL_INVALID_OPERATION;
+}
+
+
void GLAPIENTRY
_mesa_ReadnPixelsARB( GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type, GLsizei bufSize,
GLvoid *pixels )
{
- GLenum err;
+ GLenum err = GL_NO_ERROR;
+ struct gl_renderbuffer *rb;
GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+ FLUSH_VERTICES(ctx, 0);
FLUSH_CURRENT(ctx, 0);
if (MESA_VERBOSE & VERBOSE_API)
if (ctx->NewState)
_mesa_update_state(ctx);
+ if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+ _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
+ "glReadPixels(incomplete framebuffer)" );
+ return;
+ }
+
+ rb = _mesa_get_read_renderbuffer_for_format(ctx, format);
+ if (rb == NULL) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glReadPixels(read buffer)");
+ return;
+ }
+
+ /* OpenGL ES 1.x and OpenGL ES 2.0 impose additional restrictions on the
+ * combinations of format and type that can be used.
+ *
+ * Technically, only two combinations are actually allowed:
+ * GL_RGBA/GL_UNSIGNED_BYTE, and some implementation-specific internal
+ * preferred combination. This code doesn't know what that preferred
+ * combination is, and Mesa can handle anything valid. Just work instead.
+ */
+ if (_mesa_is_gles(ctx)) {
+ if (ctx->API == API_OPENGLES2 &&
+ _mesa_is_color_format(format) &&
+ _mesa_get_color_read_format(ctx) == format &&
+ _mesa_get_color_read_type(ctx) == type) {
+ err = GL_NO_ERROR;
+ } else if (ctx->Version < 30) {
+ err = _mesa_es_error_check_format_and_type(format, type, 2);
+ if (err == GL_NO_ERROR) {
+ if (type == GL_FLOAT || type == GL_HALF_FLOAT_OES) {
+ err = GL_INVALID_OPERATION;
+ }
+ }
+ } else {
+ err = read_pixels_es3_error_check(format, type, rb);
+ }
+
+ if (err == GL_NO_ERROR && (format == GL_DEPTH_COMPONENT
+ || format == GL_DEPTH_STENCIL)) {
+ err = GL_INVALID_ENUM;
+ }
+
+ if (err != GL_NO_ERROR) {
+ _mesa_error(ctx, err, "glReadPixels(invalid format %s and/or type %s)",
+ _mesa_lookup_enum_by_nr(format),
+ _mesa_lookup_enum_by_nr(type));
+ return;
+ }
+ }
+
err = _mesa_error_check_format_and_type(ctx, format, type);
if (err != GL_NO_ERROR) {
_mesa_error(ctx, err, "glReadPixels(invalid format %s and/or type %s)",
return;
}
- if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
- _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
- "glReadPixels(incomplete framebuffer)" );
+ if (_mesa_is_user_fbo(ctx->ReadBuffer) &&
+ ctx->ReadBuffer->Visual.samples > 0) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(multisample FBO)");
+ return;
+ }
+
+ if (!_mesa_source_buffer_exists(ctx, format)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(no readbuffer)");
return;
}
if (ctx->Extensions.EXT_texture_integer && _mesa_is_color_format(format)) {
const struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
const GLboolean srcInteger = _mesa_is_format_integer_color(rb->Format);
- const GLboolean dstInteger = _mesa_is_integer_format(format);
+ const GLboolean dstInteger = _mesa_is_enum_format_integer(format);
if (dstInteger != srcInteger) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glReadPixels(integer / non-integer format mismatch");
}
}
- if (ctx->ReadBuffer->Name != 0 && ctx->ReadBuffer->Visual.samples > 0) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(multisample FBO)");
- return;
- }
-
- if (!_mesa_source_buffer_exists(ctx, format)) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(no readbuffer)");
- return;
- }
-
if (width == 0 || height == 0)
return; /* nothing to do */
}
if (_mesa_is_bufferobj(ctx->Pack.BufferObj) &&
- _mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {
+ _mesa_check_disallowed_mapping(ctx->Pack.BufferObj)) {
/* buffer is mapped - that's an error */
_mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(PBO is mapped)");
return;
projects / mesa.git / blobdiff