Shader: Define a common interface for running vertex shader programs.

1 files changed, 105 insertions, 0 deletions

diff --git a/src/video_core/shader/shader.cpp b/src/video_core/shader/shader.cpp
new file mode 100644
index 000000000..e397e8e03
--- /dev/null
+++ b/src/video_core/shader/shader.cpp
@@ -0,0 +1,105 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/logging/log.h"
+#include "common/profiler.h"
+
+#include "video_core/debug_utils/debug_utils.h"
+#include "video_core/pica.h"
+
+#include "shader.h"
+#include "shader_interpreter.h"
+
+namespace Pica {
+
+namespace Shader {
+
+void Setup(UnitState& state) {
+    // TODO(bunnei): This will be used by the JIT in a subsequent commit
+}
+
+static Common::Profiling::TimingCategory shader_category("Vertex Shader");
+
+OutputVertex Run(UnitState& state, const InputVertex& input, int num_attributes) {
+    auto& config = g_state.regs.vs;
+    auto& setup = g_state.vs;
+
+    Common::Profiling::ScopeTimer timer(shader_category);
+
+    state.program_counter = config.main_offset;
+    state.debug.max_offset = 0;
+    state.debug.max_opdesc_id = 0;
+
+    // Setup input register table
+    const auto& attribute_register_map = config.input_register_map;
+
+    if (num_attributes > 0) state.input_registers[attribute_register_map.attribute0_register] = input.attr[0];
+    if (num_attributes > 1) state.input_registers[attribute_register_map.attribute1_register] = input.attr[1];
+    if (num_attributes > 2) state.input_registers[attribute_register_map.attribute2_register] = input.attr[2];
+    if (num_attributes > 3) state.input_registers[attribute_register_map.attribute3_register] = input.attr[3];
+    if (num_attributes > 4) state.input_registers[attribute_register_map.attribute4_register] = input.attr[4];
+    if (num_attributes > 5) state.input_registers[attribute_register_map.attribute5_register] = input.attr[5];
+    if (num_attributes > 6) state.input_registers[attribute_register_map.attribute6_register] = input.attr[6];
+    if (num_attributes > 7) state.input_registers[attribute_register_map.attribute7_register] = input.attr[7];
+    if (num_attributes > 8) state.input_registers[attribute_register_map.attribute8_register] = input.attr[8];
+    if (num_attributes > 9) state.input_registers[attribute_register_map.attribute9_register] = input.attr[9];
+    if (num_attributes > 10) state.input_registers[attribute_register_map.attribute10_register] = input.attr[10];
+    if (num_attributes > 11) state.input_registers[attribute_register_map.attribute11_register] = input.attr[11];
+    if (num_attributes > 12) state.input_registers[attribute_register_map.attribute12_register] = input.attr[12];
+    if (num_attributes > 13) state.input_registers[attribute_register_map.attribute13_register] = input.attr[13];
+    if (num_attributes > 14) state.input_registers[attribute_register_map.attribute14_register] = input.attr[14];
+    if (num_attributes > 15) state.input_registers[attribute_register_map.attribute15_register] = input.attr[15];
+
+    state.conditional_code[0] = false;
+    state.conditional_code[1] = false;
+
+    RunInterpreter(state);
+
+#if PICA_DUMP_SHADERS
+    DebugUtils::DumpShader(setup.program_code.data(), state.debug.max_offset, setup.swizzle_data.data(),
+        state.debug.max_opdesc_id, config.main_offset,
+        g_state.regs.vs_output_attributes); // TODO: Don't hardcode VS here
+#endif
+
+    // Setup output data
+    OutputVertex ret;
+    // TODO(neobrain): Under some circumstances, up to 16 attributes may be output. We need to
+    // figure out what those circumstances are and enable the remaining outputs then.
+    for (int i = 0; i < 7; ++i) {
+        const auto& output_register_map = g_state.regs.vs_output_attributes[i]; // TODO: Don't hardcode VS here
+
+        u32 semantics[4] = {
+            output_register_map.map_x, output_register_map.map_y,
+            output_register_map.map_z, output_register_map.map_w
+        };
+
+        for (int comp = 0; comp < 4; ++comp) {
+            float24* out = ((float24*)&ret) + semantics[comp];
+            if (semantics[comp] != Regs::VSOutputAttributes::INVALID) {
+                *out = state.output_registers[i][comp];
+            } else {
+                // Zero output so that attributes which aren't output won't have denormals in them,
+                // which would slow us down later.
+                memset(out, 0, sizeof(*out));
+            }
+        }
+    }
+
+    // The hardware takes the absolute and saturates vertex colors like this, *before* doing interpolation
+    for (int i = 0; i < 4; ++i) {
+        ret.color[i] = float24::FromFloat32(
+            std::fmin(std::fabs(ret.color[i].ToFloat32()), 1.0f));
+    }
+
+    LOG_TRACE(Render_Software, "Output vertex: pos (%.2f, %.2f, %.2f, %.2f), col(%.2f, %.2f, %.2f, %.2f), tc0(%.2f, %.2f)",
+        ret.pos.x.ToFloat32(), ret.pos.y.ToFloat32(), ret.pos.z.ToFloat32(), ret.pos.w.ToFloat32(),
+        ret.color.x.ToFloat32(), ret.color.y.ToFloat32(), ret.color.z.ToFloat32(), ret.color.w.ToFloat32(),
+        ret.tc0.u().ToFloat32(), ret.tc0.v().ToFloat32());
+
+    return ret;
+}
+
+} // namespace Shader
+
+} // namespace Pica