v0.4.0: Direct3D 11/12 backends, in-game renderer selection, per-run logging
- ra3.dx: D3D11 and D3D12 presentation backends (runtime HLSL via d3dcompiler); 2D image blit and the GPU heightfield terrain raymarch, with the corner minimap/FPS overlays. Non-Windows builds link a null fallback. - ra3.display: preferred backend plus ordered fallback (Vulkan/D3D11/D3D12/SDL); menu gains a Renderer option and the CLI gains --dx11/--dx12/--sdl, which the render command now honours too. - vendor libenderlog (MIT): every run writes openra3.log next to the exe and archives the previous run's log; records at warn and above carry a call stack (native fallback, since libc++ has no <stacktrace>). - Windows crash reporter writes openra3_crash.log (faulting module + backtrace); D3D/DXGI diagnostics are routed through the logger.
This commit is contained in:
EnderTheCoder
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// GPU heightfield raymarcher for the Direct3D backends (the D3D port of
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// terrain.vert/terrain.frag).
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//
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// Textures: heightmap (R16), a per-cell blend record (R16G16B16A16_UNORM: base
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// layer, blend layer, three-way layer, packed direction/flags; unpacked with
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// *65535) and a texture array of the tile materials (RGBA8, REPEAT). The
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// material is sampled continuously (`uv = cell / span`), as the retail
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// `Terrain.fx` / OpenSAGE `Terrain.frag` do, so it never restarts at a cell
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// edge; material boundaries cross-fade with the SAGE blend ramp.
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//
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// The Vulkan push constants (20 floats) become a constant buffer.
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cbuffer TerrainCB : register(b0) {
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float4 cam; // x=target_x, y=target_y, z=yaw, w=height
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float4 params; // x=pitch, y=fov, z=water_z, w=has_water
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float4 sun; // xyz=sun dir, w=ambient
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float4 mapinfo; // x=W, y=H, z=unused, w=z_scale
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float4 misc; // x=time, y=unused, z=cells per texture repeat, w=aspect
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};
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Texture2D<float> heightmap : register(t0);
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Texture2D<float4> celldata : register(t1);
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Texture2DArray<float4> atlas : register(t2);
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SamplerState height_smp : register(s0);
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SamplerState cell_smp : register(s1);
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SamplerState atlas_smp : register(s2);
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static const float CELL = 10.0; // must match ra3::terrain::cell_size
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struct VSOut {
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float4 pos : SV_Position;
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float2 uv : TEXCOORD0;
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};
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VSOut VSMain(uint vertex_id : SV_VertexID) {
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float2 p = float2((vertex_id << 1) & 2, vertex_id & 2);
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VSOut o;
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o.uv = p;
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o.pos = float4(p.x * 2.0 - 1.0, 1.0 - p.y * 2.0, 0.0, 1.0);
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return o;
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}
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float height_at(int2 c) {
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c = clamp(c, int2(0, 0), int2((int) mapinfo.x - 1, (int) mapinfo.y - 1));
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return heightmap.Load(int3(c, 0)) * 65535.0 * mapinfo.w;
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}
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float world_height(float wx, float wy) {
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float world_w = mapinfo.x * CELL;
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float world_h = mapinfo.y * CELL;
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if (wx < 0.0 || wy < 0.0 || wx >= world_w || wy >= world_h) return -1.0e9;
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int2 c = int2((int) (wx / CELL), (int) ((world_h - wy) / CELL));
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return height_at(c);
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}
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float3 sky_color(float3 dir) {
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float3 d = normalize(dir);
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float3 sun_dir = normalize(sun.xyz);
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float t = clamp(d.z, 0.0, 1.0);
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float3 horizon = float3(0.70, 0.78, 0.85);
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float3 zenith = float3(0.28, 0.48, 0.80);
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float3 col = lerp(horizon, zenith, pow(t, 0.6));
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float s = max(dot(d, sun_dir), 0.0);
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col += float3(1.0, 0.95, 0.82) * pow(s, 300.0) * 1.6; // sun disk
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col += float3(1.0, 0.90, 0.72) * pow(s, 8.0) * 0.18; // glow
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return col;
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}
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// The retail SAGE blend ramp: 0 at one edge of the cell, 1 at the opposite.
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// Direction: 1 right, 2 top, 4 top-right, 8 top-left; flag bit 0 flips,
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// bit 1 marks a two-sided diagonal.
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float blend_factor(uint direction, uint flags, float2 f) {
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bool flipped = (flags & 1u) != 0u;
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bool two_sided = (flags & 2u) != 0u;
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if (flipped) {
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if (direction == 1u) {
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f.x = 1.0 - f.x;
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} else if (direction == 2u || direction == 4u || direction == 8u) {
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f.y = 1.0 - f.y;
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}
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}
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if (direction == 1u) return f.x;
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if (direction == 2u) return f.y;
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if (direction == 4u) {
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float s = (1.0 - f.x) + (1.0 - f.y);
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return two_sided ? 1.0 - clamp(s - 1.0, 0.0, 1.0) : clamp(1.0 - s, 0.0, 1.0);
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}
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if (direction == 8u) {
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float s = f.x + (1.0 - f.y);
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return two_sided ? 1.0 - clamp(s - 1.0, 0.0, 1.0) : clamp(1.0 - s, 0.0, 1.0);
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}
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return 0.0;
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}
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// Sample one tile material layer at global cell coordinates. The texture repeats
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// every `span` cells with REPEAT addressing, so it never restarts at a cell edge.
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float3 sample_layer(uint layer, float wx, float wy) {
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float span = max(misc.z, 1.0);
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uint lw = 0;
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uint lh = 0;
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uint layer_count = 0;
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atlas.GetDimensions(lw, lh, layer_count);
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float l = (float) min(layer, layer_count > 0u ? layer_count - 1u : 0u);
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return atlas.Sample(atlas_smp, float3(float2(wx, wy) / span, l)).rgb;
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}
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float4 PSMain(VSOut input) : SV_Target {
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float4 p = cam;
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float pitch = clamp(params.x, 0.15, 1.45);
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float fov = clamp(params.y, 0.3, 1.4);
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float world_w = mapinfo.x * CELL;
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float world_h = mapinfo.y * CELL;
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float cp = cos(pitch);
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float3 fwd = float3(cp * sin(p.z), cp * cos(p.z), -sin(pitch));
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float3 right = normalize(cross(fwd, float3(0, 0, 1)));
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float3 up = cross(right, fwd);
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float target_z = world_height(p.x, p.y);
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if (target_z < -1.0e8) target_z = 0.0;
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float dist = p.w / sin(pitch);
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float3 cam_pos = float3(p.x, p.y, target_z + p.w) - fwd * dist;
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float2 ndc = float2(input.uv.x * 2.0 - 1.0, 1.0 - input.uv.y * 2.0);
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float aspect = misc.w;
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float th = tan(fov * 0.5);
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float3 dir = normalize(fwd + right * ndc.x * th * aspect + up * ndc.y * th);
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if (dir.z >= -1e-4) {
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return float4(sky_color(dir), 1.0);
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}
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// March the heightfield (bounded work: the step grows toward the horizon).
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float t = CELL * 0.5;
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float dt = CELL * 0.5;
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float prev = t;
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bool hit = false;
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float hit_t = 0.0;
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for (int i = 0; i < 512 && t < 60000.0; ++i) {
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float3 w = cam_pos + dir * t;
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if (w.x < 0.0 || w.y < 0.0 || w.x >= world_w || w.y >= world_h) {
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prev = t;
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dt *= 1.06;
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t += dt;
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continue;
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}
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if (params.w > 0.5 && w.z <= params.z) {
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hit = true;
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hit_t = t;
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break;
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}
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if (w.z <= world_height(w.x, w.y)) {
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hit = true;
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hit_t = t;
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break;
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}
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prev = t;
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dt *= 1.06;
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t += dt;
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}
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if (!hit) {
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return float4(sky_color(dir), 1.0);
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}
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float lo = prev;
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float hi = hit_t;
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for (int i = 0; i < 6; ++i) {
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float mid = 0.5 * (lo + hi);
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float3 w = cam_pos + dir * mid;
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bool water = params.w > 0.5 && w.z <= params.z;
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if (water || w.z <= world_height(w.x, w.y)) {
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hi = mid;
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} else {
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lo = mid;
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}
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}
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float3 hitpos = cam_pos + dir * hi;
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float3 sun_dir = normalize(sun.xyz);
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float ambient = sun.w;
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if (params.w > 0.5 && hitpos.z <= params.z + 0.01) {
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// Water: animated normal from a procedural wave, sky reflection + fresnel.
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float time = misc.x;
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float2 q = hitpos.xy * 0.015;
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float nx = sin(q.x * 1.3 + time * 1.7) + 0.5 * sin(q.x * 3.1 - time * 2.3);
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float ny = sin(q.y * 1.1 - time * 1.3) + 0.5 * sin(q.y * 2.7 + time * 1.9);
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float3 n = normalize(float3(nx * 0.06, ny * 0.06, 1.0));
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float fres = pow(1.0 - clamp(-dir.z, 0.0, 1.0), 3.0);
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float3 deep = float3(0.03, 0.16, 0.28);
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float3 refl = sky_color(reflect(dir, n));
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float lam = max(0.0, dot(n, sun_dir));
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float3 water = lerp(deep, refl, clamp(0.25 + 0.55 * fres, 0.0, 0.9));
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water += float3(1.0, 0.98, 0.9) * pow(lam, 64.0) * 0.6; // sun glint
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float wfog = clamp(1.0 - exp(-hi * 0.00009), 0.0, 0.75);
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water = lerp(water, sky_color(float3(dir.x, dir.y, 0.0)), wfog);
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return float4(water, 1.0);
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}
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// Terrain: read the per-cell blend record, sample the base/blend/three-way
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// material layers continuously and ramp between them across the cell.
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float wx = hitpos.x / CELL;
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float wy = (world_h - hitpos.y) / CELL;
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int cx = clamp((int) wx, 0, (int) mapinfo.x - 1);
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int cy = clamp((int) wy, 0, (int) mapinfo.y - 1);
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float fx = wx - floor(wx);
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float fy = wy - floor(wy);
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uint4 record = (uint4) (celldata.Load(int3(cx, cy, 0)) * 65535.0 + 0.5);
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uint packed = record.w;
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uint dir1 = packed & 0xFu;
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uint flags1 = (packed >> 4u) & 0x3u;
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uint dir2 = (packed >> 8u) & 0xFu;
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uint flags2 = (packed >> 12u) & 0x3u;
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float2 fracUV = float2(fx, fy);
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float3 c0 = sample_layer(record.x, wx, wy);
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float3 c1 = sample_layer(record.y, wx, wy);
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float3 c2 = sample_layer(record.z, wx, wy);
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float f1 = blend_factor(dir1, flags1, fracUV);
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float f2 = blend_factor(dir2, flags2, fracUV);
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float3 albedo = lerp(lerp(c0, c1, f1), c2, f2);
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// Per-pixel normal from the heightfield.
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float hl = world_height(hitpos.x - CELL, hitpos.y);
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float hr = world_height(hitpos.x + CELL, hitpos.y);
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float hd = world_height(hitpos.x, hitpos.y - CELL);
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float hu = world_height(hitpos.x, hitpos.y + CELL);
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float3 n = normalize(float3(hl - hr, hd - hu, 2.0 * CELL));
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float lambert = max(0.0, dot(n, sun_dir));
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float3 lit = albedo * (ambient + (1.0 - ambient) * lambert);
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// Distance haze toward the horizon so the map edge blends into the sky.
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float fog = clamp(1.0 - exp(-hi * 0.00009), 0.0, 0.75);
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lit = lerp(lit, sky_color(float3(dir.x, dir.y, 0.0)), fog);
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return float4(lit, 1.0);
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}
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