wined3d: Beginnings of an HLSL FFP vertex shader implementation.

Approved-by: Jan Sikorski (@jsikorski)
Approved-by: Alexandre Julliard (@julliard)
Merge-Request: https://gitlab.winehq.org/wine/wine/merge_requests/6813

dlls/wined3d/ffp_hlsl.c

@@ -1,6 +1,10 @@
 /*
  * Fixed-function pipeline replacement implemented using HLSL shaders
  *
+ * Copyright 2006 Jason Green
+ * Copyright 2006-2007 Henri Verbeet
+ * Copyright 2007-2009,2013 Stefan Dösinger for CodeWeavers
+ * Copyright 2009-2011 Henri Verbeet for CodeWeavers
  * Copyright 2022,2024 Elizabeth Figura for CodeWeavers
  *
  * This library is free software; you can redistribute it and/or
@@ -24,10 +28,122 @@
 WINE_DEFAULT_DEBUG_CHANNEL(d3d_shader);
 
 static bool ffp_hlsl_generate_vertex_shader(const struct wined3d_ffp_vs_settings *settings,
-        struct wined3d_string_buffer *string)
+        struct wined3d_string_buffer *buffer)
 {
-    FIXME("Not yet implemented.\n");
-    return false;
+    if (settings->lighting)
+        FIXME("Ignoring lighting.\n");
+
+    if (settings->point_size)
+        FIXME("Ignoring point size.\n");
+
+    if (settings->transformed)
+        FIXME("Ignoring pretransformed vertices.\n");
+
+    if (settings->vertexblends)
+        FIXME("Ignoring vertex blend.\n");
+
+    if (settings->normal)
+        FIXME("Ignoring normals.\n");
+
+    if (settings->fog_mode != WINED3D_FFP_VS_FOG_OFF)
+        FIXME("Ignoring fog.\n");
+
+    /* This must be kept in sync with struct wined3d_ffp_vs_constants. */
+    shader_addline(buffer, "uniform struct\n");
+    shader_addline(buffer, "{\n");
+    shader_addline(buffer, "    float4x4 modelview_matrices[%u];\n", MAX_VERTEX_BLENDS);
+    shader_addline(buffer, "    float4x4 projection_matrix;\n");
+    shader_addline(buffer, "    float4x4 texture_matrices[%u];\n", WINED3D_MAX_FFP_TEXTURES);
+    shader_addline(buffer, "    float4 point_params;\n");
+    shader_addline(buffer, "    struct\n");
+    shader_addline(buffer, "    {\n");
+    shader_addline(buffer, "        float4 diffuse;\n");
+    shader_addline(buffer, "        float4 ambient;\n");
+    shader_addline(buffer, "        float4 specular;\n");
+    shader_addline(buffer, "        float4 emissive;\n");
+    shader_addline(buffer, "        float power;\n");
+    shader_addline(buffer, "    } material;\n");
+    shader_addline(buffer, "    float4 ambient_colour;\n");
+    shader_addline(buffer, "    struct\n");
+    shader_addline(buffer, "    {\n");
+    shader_addline(buffer, "        float4 diffuse, specular, ambient;\n");
+    shader_addline(buffer, "        float4 position, direction;\n");
+    shader_addline(buffer, "        float4 packed_params;\n");
+    shader_addline(buffer, "        float4 attenuation;\n");
+    shader_addline(buffer, "    } lights[%u];\n", WINED3D_MAX_ACTIVE_LIGHTS);
+    shader_addline(buffer, "} c;\n");
+
+    shader_addline(buffer, "struct input\n");
+    shader_addline(buffer, "{\n");
+    shader_addline(buffer, "    float4 pos : POSITION;\n");
+    shader_addline(buffer, "    float4 blend_weight : BLENDWEIGHT;\n");
+    shader_addline(buffer, "    uint blend_indices : BLENDINDICES;\n");
+    shader_addline(buffer, "    float3 normal : NORMAL;\n");
+    shader_addline(buffer, "    float point_size : PSIZE;\n");
+    shader_addline(buffer, "    float4 diffuse : COLOR0;\n");
+    shader_addline(buffer, "    float4 specular : COLOR1;\n");
+    shader_addline(buffer, "    float4 texcoord[%u] : TEXCOORD;\n", WINED3D_MAX_FFP_TEXTURES);
+    shader_addline(buffer, "};\n\n");
+
+    shader_addline(buffer, "struct output\n");
+    shader_addline(buffer, "{\n");
+    shader_addline(buffer, "    float4 pos : POSITION;\n");
+    shader_addline(buffer, "    float4 diffuse : COLOR0;\n");
+    shader_addline(buffer, "    float4 specular : COLOR1;\n");
+    for (unsigned int i = 0; i < WINED3D_MAX_FFP_TEXTURES; ++i)
+    {
+        if (((settings->texgen[i] & 0xffff0000) != WINED3DTSS_TCI_PASSTHRU) || (settings->texcoords & (1u << i)))
+            shader_addline(buffer, "    float4 texcoord%u : TEXCOORD%u;\n", i, i);
+    }
+    shader_addline(buffer, "};\n\n");
+
+    shader_addline(buffer, "void main(in struct input i, out struct output o)\n");
+    shader_addline(buffer, "{\n");
+    shader_addline(buffer, "    float4 ec_pos = 0.0;\n\n");
+
+    shader_addline(buffer, "    ec_pos += mul(c.modelview_matrices[0], float4(i.pos.xyz, 1.0));\n\n");
+
+    shader_addline(buffer, "    o.pos = mul(c.projection_matrix, ec_pos);\n");
+    shader_addline(buffer, "    ec_pos /= ec_pos.w;\n\n");
+
+    /* No lighting. */
+    if (settings->diffuse)
+        shader_addline(buffer, "    o.diffuse = i.diffuse;\n");
+    else
+        shader_addline(buffer, "    o.diffuse = 1.0;\n");
+    shader_addline(buffer, "    o.specular = i.specular;\n\n");
+
+    for (unsigned int i = 0; i < WINED3D_MAX_FFP_TEXTURES; ++i)
+    {
+        switch (settings->texgen[i] & 0xffff0000)
+        {
+            case WINED3DTSS_TCI_PASSTHRU:
+                if (settings->texcoords & (1u << i))
+                    shader_addline(buffer, "    o.texcoord%u = mul(c.texture_matrices[%u], i.texcoord[%u]);\n",
+                            i, i, settings->texgen[i] & 0x0000ffff);
+                else
+                    continue;
+                break;
+
+            default:
+                FIXME("Unhandled texgen %#x.\n", settings->texgen[i]);
+                break;
+        }
+    }
+
+    switch (settings->fog_mode)
+    {
+        case WINED3D_FFP_VS_FOG_OFF:
+            break;
+
+        default:
+            FIXME("Unhandled fog mode %#x.\n", settings->fog_mode);
+            break;
+    }
+
+    shader_addline(buffer, "}\n");
+
+    return true;
 }
 
 static bool ffp_hlsl_generate_pixel_shader(const struct ffp_frag_settings *settings,

dlls/wined3d/wined3d_private.h

@@ -2050,10 +2050,11 @@ void context_state_fb(struct wined3d_context *context,
 
 struct wined3d_light_constants
 {
+    /* Padding is needed for the HLSL backend. */
     struct wined3d_color diffuse, specular, ambient;
     struct wined3d_vec4 position, direction;
     float range, falloff, cos_half_theta, cos_half_phi;
-    float const_att, linear_att, quad_att;
+    float const_att, linear_att, quad_att, padding;
 };
 
 /*****************************************************************************
@@ -2783,8 +2784,10 @@ struct wined3d_ffp_vs_constants
     struct wined3d_ffp_point_constants
     {
         float scale_const, scale_linear, scale_quad;
+        float padding; /* For the HLSL backend. */
     } point;
     struct wined3d_material material;
+    float padding[3]; /* For the HLSL backend. */
     struct wined3d_ffp_light_constants
     {
         struct wined3d_color ambient;