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[GPU] Screen scissor alongside window scissor

This commit is contained in:
Triang3l 2021-05-04 22:54:05 +03:00
parent fb01ccaac6
commit 330beaf552
4 changed files with 78 additions and 59 deletions
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103
src/xenia/gpu/draw_util.cc
View File

@ -564,48 +564,54 @@ void GetHostViewportInfo(const RegisterFile& regs, uint32_t resolution_scale,
}
}
void GetScissor(const RegisterFile& regs, Scissor& scissor_out) {
// FIXME(Triang3l): Screen scissor isn't applied here, but it seems to be
// unused on Xbox 360 Direct3D 9.
// TODO(Triang3l): Clamp X to RB_SURFACE_INFO::surface_pitch to prevent
// overflow with target-indepdent rasterization (with ROV).
void GetScissor(const RegisterFile& regs, Scissor& scissor_out,
bool clamp_to_surface_pitch) {
auto pa_sc_window_scissor_tl = regs.Get<reg::PA_SC_WINDOW_SCISSOR_TL>();
int32_t tl_x = int32_t(pa_sc_window_scissor_tl.tl_x);
int32_t tl_y = int32_t(pa_sc_window_scissor_tl.tl_y);
auto pa_sc_window_scissor_br = regs.Get<reg::PA_SC_WINDOW_SCISSOR_BR>();
uint32_t tl_x = pa_sc_window_scissor_tl.tl_x;
uint32_t tl_y = pa_sc_window_scissor_tl.tl_y;
uint32_t br_x = pa_sc_window_scissor_br.br_x;
uint32_t br_y = pa_sc_window_scissor_br.br_y;
int32_t br_x = int32_t(pa_sc_window_scissor_br.br_x);
int32_t br_y = int32_t(pa_sc_window_scissor_br.br_y);
if (!pa_sc_window_scissor_tl.window_offset_disable) {
auto pa_sc_window_offset = regs.Get<reg::PA_SC_WINDOW_OFFSET>();
tl_x = uint32_t(std::max(
int32_t(tl_x) + pa_sc_window_offset.window_x_offset, int32_t(0)));
tl_y = uint32_t(std::max(
int32_t(tl_y) + pa_sc_window_offset.window_y_offset, int32_t(0)));
br_x = uint32_t(std::max(
int32_t(br_x) + pa_sc_window_offset.window_x_offset, int32_t(0)));
br_y = uint32_t(std::max(
int32_t(br_y) + pa_sc_window_offset.window_y_offset, int32_t(0)));
tl_x += pa_sc_window_offset.window_x_offset;
tl_y += pa_sc_window_offset.window_y_offset;
br_x += pa_sc_window_offset.window_x_offset;
br_y += pa_sc_window_offset.window_y_offset;
}
// Screen scissor is not used by Direct3D 9 (always 0, 0 to 8192, 8192), but
// still handled here for completeness.
auto pa_sc_screen_scissor_tl = regs.Get<reg::PA_SC_SCREEN_SCISSOR_TL>();
tl_x = std::max(tl_x, pa_sc_screen_scissor_tl.tl_x);
tl_y = std::max(tl_y, pa_sc_screen_scissor_tl.tl_y);
auto pa_sc_screen_scissor_br = regs.Get<reg::PA_SC_SCREEN_SCISSOR_BR>();
br_x = std::min(br_x, pa_sc_screen_scissor_br.br_x);
br_y = std::min(br_y, pa_sc_screen_scissor_br.br_y);
if (clamp_to_surface_pitch) {
// Clamp the horizontal scissor to surface_pitch for safety, in case that's
// not done by the guest for some reason (it's not when doing draws without
// clipping in Direct3D 9, for instance), to prevent overflow - this is
// important for host implementations, both based on target-indepedent
// rasterization without render target width at all (pixel shader
// interlock-based custom RB implementations) and using conventional render
// targets, but padded to EDRAM tiles.
uint32_t surface_pitch = regs.Get<reg::RB_SURFACE_INFO>().surface_pitch;
tl_x = std::min(tl_x, int32_t(surface_pitch));
br_x = std::min(br_x, int32_t(surface_pitch));
}
// Clamp the horizontal scissor to surface_pitch for safety, in case that's
// not done by the guest for some reason (it's not when doing draws completely
// without a viewport, for instance), to prevent overflow - this is important
// for host implementations, both based on target-indepedent rasterization
// without render target width at all (pixel shader interlocks-based custom RB
// implementations) and using conventional render targets, but padded to EDRAM
// tiles.
uint32_t surface_pitch = regs.Get<reg::RB_SURFACE_INFO>().surface_pitch;
tl_x = std::min(tl_x, surface_pitch);
br_x = std::min(br_x, surface_pitch);
// Ensure the rectangle is non-negative, by collapsing it into a 0-sized one
// (not by reordering the bounds preserving the width / height, which would
// reveal samples not meant to be covered, unless TL > BR does that on a real
// console, but no evidence of such has ever been seen).
// console, but no evidence of such has ever been seen), and also drop
// negative offsets.
tl_x = std::max(tl_x, int32_t(0));
tl_y = std::max(tl_y, int32_t(0));
br_x = std::max(br_x, tl_x);
br_y = std::max(br_y, tl_y);
scissor_out.offset[0] = tl_x;
scissor_out.offset[1] = tl_y;
scissor_out.extent[0] = br_x - tl_x;
scissor_out.extent[1] = br_y - tl_y;
scissor_out.offset[0] = uint32_t(tl_x);
scissor_out.offset[1] = uint32_t(tl_y);
scissor_out.extent[0] = uint32_t(br_x - tl_x);
scissor_out.extent[1] = uint32_t(br_y - tl_y);
}
xenos::CopySampleSelect SanitizeCopySampleSelect(
@ -780,28 +786,17 @@ bool GetResolveInfo(const RegisterFile& regs, const Memory& memory,
}
// Apply the scissor and prevent negative origin (behind the EDRAM base).
auto pa_sc_window_scissor_tl = regs.Get<reg::PA_SC_WINDOW_SCISSOR_TL>();
auto pa_sc_window_scissor_br = regs.Get<reg::PA_SC_WINDOW_SCISSOR_BR>();
int32_t scissor_x0 = int32_t(pa_sc_window_scissor_tl.tl_x);
int32_t scissor_y0 = int32_t(pa_sc_window_scissor_tl.tl_y);
int32_t scissor_x1 =
std::max(int32_t(pa_sc_window_scissor_br.br_x), scissor_x0);
int32_t scissor_y1 =
std::max(int32_t(pa_sc_window_scissor_br.br_y), scissor_y0);
if (!pa_sc_window_scissor_tl.window_offset_disable) {
scissor_x0 =
std::max(scissor_x0 + pa_sc_window_offset.window_x_offset, int32_t(0));
scissor_y0 =
std::max(scissor_y0 + pa_sc_window_offset.window_y_offset, int32_t(0));
scissor_x1 =
std::max(scissor_x1 + pa_sc_window_offset.window_x_offset, int32_t(0));
scissor_y1 =
std::max(scissor_y1 + pa_sc_window_offset.window_y_offset, int32_t(0));
}
x0 = xe::clamp(x0, scissor_x0, scissor_x1);
y0 = xe::clamp(y0, scissor_y0, scissor_y1);
x1 = xe::clamp(x1, scissor_x0, scissor_x1);
y1 = xe::clamp(y1, scissor_y0, scissor_y1);
Scissor scissor;
// False because clamping to the surface pitch will be done later (it will be
// aligned to the resolve alignment here, for resolving from render targets
// with a pitch that is not a multiple of 8).
GetScissor(regs, scissor, false);
int32_t scissor_right = int32_t(scissor.offset[0] + scissor.extent[0]);
int32_t scissor_bottom = int32_t(scissor.offset[1] + scissor.extent[1]);
x0 = xe::clamp(x0, int32_t(scissor.offset[0]), scissor_right);
y0 = xe::clamp(y0, int32_t(scissor.offset[1]), scissor_bottom);
x1 = xe::clamp(x1, int32_t(scissor.offset[0]), scissor_right);
y1 = xe::clamp(y1, int32_t(scissor.offset[1]), scissor_bottom);
assert_true(x0 <= x1 && y0 <= y1);

3
src/xenia/gpu/draw_util.h
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@ -118,7 +118,8 @@ struct Scissor {
// Extent can be zero.
uint32_t extent[2];
};
void GetScissor(const RegisterFile& regs, Scissor& scissor_out);
void GetScissor(const RegisterFile& regs, Scissor& scissor_out,
bool clamp_to_surface_pitch = true);
// Scales, and shift amounts of the upper 32 bits of the 32x32=64-bit
// multiplication result, for fast division and multiplication by

20
src/xenia/gpu/registers.h
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@ -349,6 +349,26 @@ union PA_CL_VTE_CNTL {
static constexpr Register register_index = XE_GPU_REG_PA_CL_VTE_CNTL;
};
union PA_SC_SCREEN_SCISSOR_TL {
struct {
int32_t tl_x : 15; // +0
uint32_t : 1; // +15
int32_t tl_y : 15; // +16
};
uint32_t value;
static constexpr Register register_index = XE_GPU_REG_PA_SC_SCREEN_SCISSOR_TL;
};
union PA_SC_SCREEN_SCISSOR_BR {
struct {
int32_t br_x : 15; // +0
uint32_t : 1; // +15
int32_t br_y : 15; // +16
};
uint32_t value;
static constexpr Register register_index = XE_GPU_REG_PA_SC_SCREEN_SCISSOR_BR;
};
union PA_SC_WINDOW_OFFSET {
struct {
int32_t window_x_offset : 15; // +0

11
src/xenia/gpu/render_target_cache.cc
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@ -590,12 +590,15 @@ bool RenderTargetCache::Update(bool is_rasterization_done,
height_used = uint32_t(
std::min(std::fmax(viewport_bottom, 0.0f), float(height_used)));
}
uint32_t scissor_bottom = regs.Get<reg::PA_SC_WINDOW_SCISSOR_BR>().br_y;
int32_t scissor_bottom =
int32_t(regs.Get<reg::PA_SC_WINDOW_SCISSOR_BR>().br_y);
if (!regs.Get<reg::PA_SC_WINDOW_SCISSOR_TL>().window_offset_disable) {
scissor_bottom = uint32_t(
std::max(int32_t(scissor_bottom) + window_y_offset, int32_t(0)));
scissor_bottom += window_y_offset;
}
height_used = std::min(height_used, scissor_bottom);
scissor_bottom =
std::min(scissor_bottom, regs.Get<reg::PA_SC_SCREEN_SCISSOR_BR>().br_y);
height_used =
std::min(height_used, uint32_t(std::max(scissor_bottom, int32_t(0))));
// Sorted by EDRAM base and then by index in the pipeline - for simplicity,
// treat render targets placed closer to the end of the EDRAM as truncating