/*
* Copyright © 2014 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* 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
* 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 "brw_context.h"
#include "brw_defines.h"
#include "intel_fbo.h"
#include "brw_meta_util.h"
#include "brw_state.h"
#include "main/blend.h"
#include "main/fbobject.h"
#include "util/format_srgb.h"
/**
* Helper function for handling mirror image blits.
*
* If coord0 > coord1, swap them and invert the "mirror" boolean.
*/
static inline void
fixup_mirroring(bool *mirror, float *coord0, float *coord1)
{
if (*coord0 > *coord1) {
*mirror = !*mirror;
float tmp = *coord0;
*coord0 = *coord1;
*coord1 = tmp;
}
}
/**
* Compute the number of pixels to clip for each side of a rect
*
* \param x0 The rect's left coordinate
* \param y0 The rect's bottom coordinate
* \param x1 The rect's right coordinate
* \param y1 The rect's top coordinate
* \param min_x The clipping region's left coordinate
* \param min_y The clipping region's bottom coordinate
* \param max_x The clipping region's right coordinate
* \param max_y The clipping region's top coordinate
* \param clipped_x0 The number of pixels to clip from the left side
* \param clipped_y0 The number of pixels to clip from the bottom side
* \param clipped_x1 The number of pixels to clip from the right side
* \param clipped_y1 The number of pixels to clip from the top side
*
* \return false if we clip everything away, true otherwise
*/
static inline bool
compute_pixels_clipped(float x0, float y0, float x1, float y1,
float min_x, float min_y, float max_x, float max_y,
float *clipped_x0, float *clipped_y0, float *clipped_x1, float *clipped_y1)
{
/* If we are going to clip everything away, stop. */
if (!(min_x <= max_x &&
min_y <= max_y &&
x0 <= max_x &&
y0 <= max_y &&
min_x <= x1 &&
min_y <= y1 &&
x0 <= x1 &&
y0 <= y1)) {
return false;
}
if (x0 < min_x)
*clipped_x0 = min_x - x0;
else
*clipped_x0 = 0;
if (max_x < x1)
*clipped_x1 = x1 - max_x;
else
*clipped_x1 = 0;
if (y0 < min_y)
*clipped_y0 = min_y - y0;
else
*clipped_y0 = 0;
if (max_y < y1)
*clipped_y1 = y1 - max_y;
else
*clipped_y1 = 0;
return true;
}
/**
* Clips a coordinate (left, right, top or bottom) for the src or dst rect
* (whichever requires the largest clip) and adjusts the coordinate
* for the other rect accordingly.
*
* \param mirror true if mirroring is required
* \param src the source rect coordinate (for example srcX0)
* \param dst0 the dst rect coordinate (for example dstX0)
* \param dst1 the opposite dst rect coordinate (for example dstX1)
* \param clipped_src0 number of pixels to clip from the src coordinate
* \param clipped_dst0 number of pixels to clip from the dst coordinate
* \param clipped_dst1 number of pixels to clip from the opposite dst coordinate
* \param scale the src vs dst scale involved for that coordinate
* \param isLeftOrBottom true if we are clipping the left or bottom sides
* of the rect.
*/
static inline void
clip_coordinates(bool mirror,
float *src, float *dst0, float *dst1,
float clipped_src0,
float clipped_dst0,
float clipped_dst1,
float scale,
bool isLeftOrBottom)
{
/* When clipping we need to add or subtract pixels from the original
* coordinates depending on whether we are acting on the left/bottom
* or right/top sides of the rect respectively. We assume we have to
* add them in the code below, and multiply by -1 when we should
* subtract.
*/
int mult = isLeftOrBottom ? 1 : -1;
if (!mirror) {
if (clipped_src0 >= clipped_dst0 * scale) {
*src += clipped_src0 * mult;
*dst0 += clipped_src0 / scale * mult;
} else {
*dst0 += clipped_dst0 * mult;
*src += clipped_dst0 * scale * mult;
}
} else {
if (clipped_src0 >= clipped_dst1 * scale) {
*src += clipped_src0 * mult;
*dst1 -= clipped_src0 / scale * mult;
} else {
*dst1 -= clipped_dst1 * mult;
*src += clipped_dst1 * scale * mult;
}
}
}
bool
brw_meta_mirror_clip_and_scissor(const struct gl_context *ctx,
const struct gl_framebuffer *read_fb,
const struct gl_framebuffer *draw_fb,
GLfloat *srcX0, GLfloat *srcY0,
GLfloat *srcX1, GLfloat *srcY1,
GLfloat *dstX0, GLfloat *dstY0,
GLfloat *dstX1, GLfloat *dstY1,
bool *mirror_x, bool *mirror_y)
{
*mirror_x = false;
*mirror_y = false;
/* Detect if the blit needs to be mirrored */
fixup_mirroring(mirror_x, srcX0, srcX1);
fixup_mirroring(mirror_x, dstX0, dstX1);
fixup_mirroring(mirror_y, srcY0, srcY1);
fixup_mirroring(mirror_y, dstY0, dstY1);
/* Compute number of pixels to clip for each side of both rects. Return
* early if we are going to clip everything away.
*/
float clip_src_x0;
float clip_src_x1;
float clip_src_y0;
float clip_src_y1;
float clip_dst_x0;
float clip_dst_x1;
float clip_dst_y0;
float clip_dst_y1;
if (!compute_pixels_clipped(*srcX0, *srcY0, *srcX1, *srcY1,
0, 0, read_fb->Width, read_fb->Height,
&clip_src_x0, &clip_src_y0, &clip_src_x1, &clip_src_y1))
return true;
if (!compute_pixels_clipped(*dstX0, *dstY0, *dstX1, *dstY1,
draw_fb->_Xmin, draw_fb->_Ymin, draw_fb->_Xmax, draw_fb->_Ymax,
&clip_dst_x0, &clip_dst_y0, &clip_dst_x1, &clip_dst_y1))
return true;
/* When clipping any of the two rects we need to adjust the coordinates in
* the other rect considering the scaling factor involved. To obtain the best
* precision we want to make sure that we only clip once per side to avoid
* accumulating errors due to the scaling adjustment.
*
* For example, if srcX0 and dstX0 need both to be clipped we want to avoid
* the situation where we clip srcX0 first, then adjust dstX0 accordingly
* but then we realize that the resulting dstX0 still needs to be clipped,
* so we clip dstX0 and adjust srcX0 again. Because we are applying scaling
* factors to adjust the coordinates in each clipping pass we lose some
* precision and that can affect the results of the blorp blit operation
* slightly. What we want to do here is detect the rect that we should
* clip first for each side so that when we adjust the other rect we ensure
* the resulting coordinate does not need to be clipped again.
*
* The code below implements this by comparing the number of pixels that
* we need to clip for each side of both rects considering the scales
* involved. For example, clip_src_x0 represents the number of pixels to be
* clipped for the src rect's left side, so if clip_src_x0 = 5,
* clip_dst_x0 = 4 and scaleX = 2 it means that we are clipping more from
* the dst rect so we should clip dstX0 only and adjust srcX0. This is
* because clipping 4 pixels in the dst is equivalent to clipping
* 4 * 2 = 8 > 5 in the src.
*/
float scaleX = (float) (*srcX1 - *srcX0) / (*dstX1 - *dstX0);
float scaleY = (float) (*srcY1 - *srcY0) / (*dstY1 - *dstY0);
/* Clip left side */
clip_coordinates(*mirror_x,
srcX0, dstX0, dstX1,
clip_src_x0, clip_dst_x0, clip_dst_x1,
scaleX, true);
/* Clip right side */
clip_coordinates(*mirror_x,
srcX1, dstX1, dstX0,
clip_src_x1, clip_dst_x1, clip_dst_x0,
scaleX, false);
/* Clip bottom side */
clip_coordinates(*mirror_y,
srcY0, dstY0, dstY1,
clip_src_y0, clip_dst_y0, clip_dst_y1,
scaleY, true);
/* Clip top side */
clip_coordinates(*mirror_y,
srcY1, dstY1, dstY0,
clip_src_y1, clip_dst_y1, clip_dst_y0,
scaleY, false);
/* Account for the fact that in the system framebuffer, the origin is at
* the lower left.
*/
if (_mesa_is_winsys_fbo(read_fb)) {
GLint tmp = read_fb->Height - *srcY0;
*srcY0 = read_fb->Height - *srcY1;
*srcY1 = tmp;
*mirror_y = !*mirror_y;
}
if (_mesa_is_winsys_fbo(draw_fb)) {
GLint tmp = draw_fb->Height - *dstY0;
*dstY0 = draw_fb->Height - *dstY1;
*dstY1 = tmp;
*mirror_y = !*mirror_y;
}
return false;
}
/**
* Determine if fast color clear supports the given clear color.
*
* Fast color clear can only clear to color values of 1.0 or 0.0. At the
* moment we only support floating point, unorm, and snorm buffers.
*/
bool
brw_is_color_fast_clear_compatible(struct brw_context *brw,
const struct intel_mipmap_tree *mt,
const union gl_color_union *color)
{
const struct gen_device_info *devinfo = &brw->screen->devinfo;
const struct gl_context *ctx = &brw->ctx;
/* If we're mapping the render format to a different format than the
* format we use for texturing then it is a bit questionable whether it
* should be possible to use a fast clear. Although we only actually
* render using a renderable format, without the override workaround it
* wouldn't be possible to have a non-renderable surface in a fast clear
* state so the hardware probably legitimately doesn't need to support
* this case. At least on Gen9 this really does seem to cause problems.
*/
if (devinfo->gen >= 9 &&
brw_isl_format_for_mesa_format(mt->format) !=
brw->mesa_to_isl_render_format[mt->format])
return false;
const bool srgb_rb = _mesa_get_srgb_format_linear(mt->format) != mt->format;
/* Gen10 doesn't automatically decode the clear color of sRGB buffers. Since
* we currently don't perform this decode in software, avoid a fast-clear
* altogether. TODO: Do this in software.
*/
const mesa_format format = _mesa_get_render_format(ctx, mt->format);
if (devinfo->gen >= 10 && srgb_rb) {
perf_debug("sRGB fast clear not enabled for (%s)",
_mesa_get_format_name(format));
return false;
}
if (_mesa_is_format_integer_color(format)) {
if (devinfo->gen >= 8) {
perf_debug("Integer fast clear not enabled for (%s)",
_mesa_get_format_name(format));
}
return false;
}
for (int i = 0; i < 4; i++) {
if (!_mesa_format_has_color_component(format, i)) {
continue;
}
if (devinfo->gen < 9 &&
color->f[i] != 0.0f && color->f[i] != 1.0f) {
return false;
}
}
return true;
}
/**
* Convert the given color to a bitfield suitable for ORing into DWORD 7 of
* SURFACE_STATE (DWORD 12-15 on SKL+).
*/
union isl_color_value
brw_meta_convert_fast_clear_color(const struct brw_context *brw,
const struct intel_mipmap_tree *mt,
const union gl_color_union *color)
{
union isl_color_value override_color = {
.u32 = {
color->ui[0],
color->ui[1],
color->ui[2],
color->ui[3],
},
};
/* The sampler doesn't look at the format of the surface when the fast
* clear color is used so we need to implement luminance, intensity and
* missing components manually.
*/
switch (_mesa_get_format_base_format(mt->format)) {
case GL_INTENSITY:
override_color.u32[3] = override_color.u32[0];
/* flow through */
case GL_LUMINANCE:
case GL_LUMINANCE_ALPHA:
override_color.u32[1] = override_color.u32[0];
override_color.u32[2] = override_color.u32[0];
break;
default:
for (int i = 0; i < 3; i++) {
if (!_mesa_format_has_color_component(mt->format, i))
override_color.u32[i] = 0;
}
break;
}
switch (_mesa_get_format_datatype(mt->format)) {
case GL_UNSIGNED_NORMALIZED:
for (int i = 0; i < 4; i++)
override_color.f32[i] = CLAMP(override_color.f32[i], 0.0f, 1.0f);
break;
case GL_SIGNED_NORMALIZED:
for (int i = 0; i < 4; i++)
override_color.f32[i] = CLAMP(override_color.f32[i], -1.0f, 1.0f);
break;
case GL_UNSIGNED_INT:
for (int i = 0; i < 4; i++) {
unsigned bits = _mesa_get_format_bits(mt->format, GL_RED_BITS + i);
if (bits < 32) {
uint32_t max = (1u << bits) - 1;
override_color.u32[i] = MIN2(override_color.u32[i], max);
}
}
break;
case GL_INT:
for (int i = 0; i < 4; i++) {
unsigned bits = _mesa_get_format_bits(mt->format, GL_RED_BITS + i);
if (bits < 32) {
int32_t max = (1 << (bits - 1)) - 1;
int32_t min = -(1 << (bits - 1));
override_color.i32[i] = CLAMP(override_color.i32[i], min, max);
}
}
break;
case GL_FLOAT:
if (!_mesa_is_format_signed(mt->format)) {
for (int i = 0; i < 4; i++)
override_color.f32[i] = MAX2(override_color.f32[i], 0.0f);
}
break;
}
if (!_mesa_format_has_color_component(mt->format, 3)) {
if (_mesa_is_format_integer_color(mt->format))
override_color.u32[3] = 1;
else
override_color.f32[3] = 1.0f;
}
/* Handle linear to SRGB conversion */
if (brw->ctx.Color.sRGBEnabled &&
_mesa_get_srgb_format_linear(mt->format) != mt->format) {
for (int i = 0; i < 3; i++) {
override_color.f32[i] =
util_format_linear_to_srgb_float(override_color.f32[i]);
}
}
return override_color;
}