From 1fe9b0b82eb2478f8930d18843c959c3e85dde1e Mon Sep 17 00:00:00 2001
From: Yuri Kunde Schlesner <yuriks@yuriks.net>
Date: Tue, 21 Jul 2015 03:26:04 -0300
Subject: [PATCH] VideoCore: Fix values of unset components in input attribute
arrays
If an input attribute array had a field with less than 4 components, the
remaining components were left unset if not specified by a default
vertex attribute. If neither mechanism would set a component, it would
assume a garbage value.
It has been verified that the hardware behavior is to instead to set the
missing components from the fixed default of (0 0 0 1). The default
vertex attribute values aren't used at all if a vertex array is
specified for that attribute.
Fixes UI graphics on Fire Emblem: Awakening, a small texturing glitch
when selecting a character in Cubic Ninja, as well as eliminating the
unset-W hack which was required for Ocarina of Time to not have
garbled triangles.
This change has been tested against hardware.
---
src/video_core/command_processor.cpp | 80 +++++++++++++---------------
1 file changed, 38 insertions(+), 42 deletions(-)
diff --git a/src/video_core/command_processor.cpp b/src/video_core/command_processor.cpp
index 8b10d73404..bbe7e63dc6 100644
--- a/src/video_core/command_processor.cpp
+++ b/src/video_core/command_processor.cpp
@@ -217,57 +217,53 @@ static inline void WritePicaReg(u32 id, u32 value, u32 mask) {
// Initialize data for the current vertex
VertexShader::InputVertex input;
- // Load a debugging token to check whether this gets loaded by the running
- // application or not.
- static const float24 debug_token = float24::FromRawFloat24(0x00abcdef);
- input.attr[0].w = debug_token;
-
for (int i = 0; i < attribute_config.GetNumTotalAttributes(); ++i) {
- // Load the default attribute if we're configured to do so, this data will be overwritten by the loader data if it's set
- if (attribute_config.IsDefaultAttribute(i)) {
+ if (vertex_attribute_elements[i] != 0) {
+ // Default attribute values set if array elements have < 4 components. This
+ // is *not* carried over from the default attribute settings even if they're
+ // enabled for this attribute.
+ static const float24 zero = float24::FromFloat32(0.0f);
+ static const float24 one = float24::FromFloat32(1.0f);
+ input.attr[i] = Math::Vec4<float24>(zero, zero, zero, one);
+
+ // Load per-vertex data from the loader arrays
+ for (unsigned int comp = 0; comp < vertex_attribute_elements[i]; ++comp) {
+ u32 source_addr = vertex_attribute_sources[i] + vertex_attribute_strides[i] * vertex + comp * vertex_attribute_element_size[i];
+ const u8* srcdata = Memory::GetPhysicalPointer(source_addr);
+
+ if (g_debug_context && Pica::g_debug_context->recorder) {
+ memory_accesses.AddAccess(source_addr,
+ (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::FLOAT) ? 4
+ : (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::SHORT) ? 2 : 1);
+ }
+
+ const float srcval = (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::BYTE) ? *(s8*)srcdata :
+ (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::UBYTE) ? *(u8*)srcdata :
+ (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::SHORT) ? *(s16*)srcdata :
+ *(float*)srcdata;
+
+ input.attr[i][comp] = float24::FromFloat32(srcval);
+ LOG_TRACE(HW_GPU, "Loaded component %x of attribute %x for vertex %x (index %x) from 0x%08x + 0x%08lx + 0x%04lx: %f",
+ comp, i, vertex, index,
+ attribute_config.GetPhysicalBaseAddress(),
+ vertex_attribute_sources[i] - base_address,
+ vertex_attribute_strides[i] * vertex + comp * vertex_attribute_element_size[i],
+ input.attr[i][comp].ToFloat32());
+ }
+ } else if (attribute_config.IsDefaultAttribute(i)) {
+ // Load the default attribute if we're configured to do so
input.attr[i] = g_state.vs.default_attributes[i];
LOG_TRACE(HW_GPU, "Loaded default attribute %x for vertex %x (index %x): (%f, %f, %f, %f)",
i, vertex, index,
input.attr[i][0].ToFloat32(), input.attr[i][1].ToFloat32(),
input.attr[i][2].ToFloat32(), input.attr[i][3].ToFloat32());
- }
-
- // Load per-vertex data from the loader arrays
- for (unsigned int comp = 0; comp < vertex_attribute_elements[i]; ++comp) {
- u32 source_addr = vertex_attribute_sources[i] + vertex_attribute_strides[i] * vertex + comp * vertex_attribute_element_size[i];
- const u8* srcdata = Memory::GetPhysicalPointer(source_addr);
-
- if (g_debug_context && Pica::g_debug_context->recorder) {
- memory_accesses.AddAccess(source_addr,
- (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::FLOAT) ? 4
- : (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::SHORT) ? 2 : 1);
- }
-
- const float srcval = (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::BYTE) ? *(s8*)srcdata :
- (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::UBYTE) ? *(u8*)srcdata :
- (vertex_attribute_formats[i] == Regs::VertexAttributeFormat::SHORT) ? *(s16*)srcdata :
- *(float*)srcdata;
-
- input.attr[i][comp] = float24::FromFloat32(srcval);
- LOG_TRACE(HW_GPU, "Loaded component %x of attribute %x for vertex %x (index %x) from 0x%08x + 0x%08lx + 0x%04lx: %f",
- comp, i, vertex, index,
- attribute_config.GetPhysicalBaseAddress(),
- vertex_attribute_sources[i] - base_address,
- vertex_attribute_strides[i] * vertex + comp * vertex_attribute_element_size[i],
- input.attr[i][comp].ToFloat32());
+ } else {
+ // TODO(yuriks): In this case, no data gets loaded and the vertex remains
+ // with the last value it had. This isn't currently maintained
+ // as global state, however, and so won't work in Cita yet.
}
}
- // HACK: Some games do not initialize the vertex position's w component. This leads
- // to critical issues since it messes up perspective division. As a
- // workaround, we force the fourth component to 1.0 if we find this to be the
- // case.
- // To do this, we additionally have to assume that the first input attribute
- // is the vertex position, since there's no information about this other than
- // the empiric observation that this is usually the case.
- if (input.attr[0].w == debug_token)
- input.attr[0].w = float24::FromFloat32(1.0);
-
if (g_debug_context)
g_debug_context->OnEvent(DebugContext::Event::VertexLoaded, (void*)&input);