Merge pull request #5013 from maiconpintoabreu/zig-examples

[zig] Add run examples using zig and emscripten for web

BINDINGS.md

@@ -18,6 +18,7 @@ Some people ported raylib to other languages in the form of bindings or wrappers
 | [cl-raylib](https://github.com/longlene/cl-raylib)                                       | 4.0              | [Common Lisp](https://common-lisp.net)                               | MIT                  |
 | [claylib/wrap](https://github.com/defun-games/claylib)                                   | 4.5              | [Common Lisp](https://common-lisp.net)                               | Zlib                 |
 | [claw-raylib](https://github.com/bohonghuang/claw-raylib)                                | **auto**         | [Common Lisp](https://common-lisp.net)                               | Apache-2.0           |
+| [raylib](https://github.com/fosskers/raylib)                                             | 5.5              | [Common Lisp](https://common-lisp.net)                               | MPL-2.0              |
 | [chez-raylib](https://github.com/Yunoinsky/chez-raylib)                                  | **auto**         | [Chez Scheme](https://cisco.github.io/ChezScheme)                    | GPLv3                |
 | [CLIPSraylib](https://github.com/mrryanjohnston/CLIPSraylib)                             | **auto**         | [CLIPS](https://www.clipsrules.net/)                                 | MIT                  |
 | [raylib-cr](https://github.com/sol-vin/raylib-cr)                                        | 4.6-dev (5e1a81) | [Crystal](https://crystal-lang.org)                                  | Apache-2.0           |

build.zig

@@ -4,6 +4,9 @@ const builtin = @import("builtin");
 /// Minimum supported version of Zig
 const min_ver = "0.13.0";
 
+const emccOutputDir = "zig-out" ++ std.fs.path.sep_str ++ "htmlout" ++ std.fs.path.sep_str;
+const emccOutputFile = "index.html";
+
 comptime {
     const order = std.SemanticVersion.order;
     const parse = std.SemanticVersion.parse;
@@ -45,6 +48,26 @@ fn emSdkSetupStep(b: *std.Build, emsdk: *std.Build.Dependency) !?*std.Build.Step
     }
 }
 
+// Adapted from Not-Nik/raylib-zig
+fn emscriptenRunStep(b: *std.Build, emsdk: *std.Build.Dependency, examplePath: []const u8) !*std.Build.Step.Run {
+    const dot_emsc_path = emsdk.path("upstream/emscripten/cache/sysroot/include").getPath(b);
+    // If compiling on windows , use emrun.bat.
+    const emrunExe = switch (builtin.os.tag) {
+        .windows => "emrun.bat",
+        else => "emrun",
+    };
+    var emrun_run_arg = try b.allocator.alloc(u8, dot_emsc_path.len + emrunExe.len + 1);
+    defer b.allocator.free(emrun_run_arg);
+
+    if (b.sysroot == null) {
+        emrun_run_arg = try std.fmt.bufPrint(emrun_run_arg, "{s}", .{emrunExe});
+    } else {
+        emrun_run_arg = try std.fmt.bufPrint(emrun_run_arg, "{s}" ++ std.fs.path.sep_str ++ "{s}", .{ dot_emsc_path, emrunExe });
+    }
+    const run_cmd = b.addSystemCommand(&.{ emrun_run_arg, examplePath });
+    return run_cmd;
+}
+
 /// A list of all flags from `src/config.h` that one may override
 const config_h_flags = outer: {
     // Set this value higher if compile errors happen as `src/config.h` gets larger
@@ -339,7 +362,6 @@ fn compileRaylib(b: *std.Build, target: std.Build.ResolvedTarget, optimize: std.
             setDesktopPlatform(raylib, options.platform);
         },
         .emscripten => {
-            // Include emscripten for cross compilation
             if (b.lazyDependency("emsdk", .{})) |dep| {
                 if (try emSdkSetupStep(b, dep)) |emSdkStep| {
                     raylib.step.dependOn(&emSdkStep.step);
@@ -511,12 +533,9 @@ fn addExamples(
     optimize: std.builtin.OptimizeMode,
     raylib: *std.Build.Step.Compile,
 ) !*std.Build.Step {
-    if (target.result.os.tag == .emscripten) {
-        return &b.addFail("Emscripten building via Zig unsupported").step;
-    }
-
     const all = b.step(module, "All " ++ module ++ " examples");
     const module_subpath = b.pathJoin(&.{ "examples", module });
+    const module_resources = b.pathJoin(&.{ module_subpath, "resources@resources" });
     var dir = try std.fs.cwd().openDir(b.pathFromRoot(module_subpath), .{ .iterate = true });
     defer if (comptime builtin.zig_version.minor >= 12) dir.close();
 
@@ -530,6 +549,88 @@ fn addExamples(
         // zig's mingw headers do not include pthread.h
         if (std.mem.eql(u8, "core_loading_thread", name) and target.result.os.tag == .windows) continue;
 
+        if (target.result.os.tag == .emscripten) {
+            const exe_lib = b.addStaticLibrary(.{
+                .name = name,
+                .target = target,
+                .optimize = optimize,
+            });
+            exe_lib.addCSourceFile(.{
+                .file = b.path(path),
+                .flags = &.{},
+            });
+            exe_lib.linkLibC();
+
+            if (std.mem.eql(u8, name, "rlgl_standalone")) {
+                //TODO: Make rlgl_standalone example work
+                continue;
+            }
+            if (std.mem.eql(u8, name, "raylib_opengl_interop")) {
+                //TODO: Make raylib_opengl_interop example work
+                continue;
+            }
+
+            exe_lib.linkLibrary(raylib);
+
+            // Include emscripten for cross compilation
+            if (b.lazyDependency("emsdk", .{})) |emsdk_dep| {
+                if (try emSdkSetupStep(b, emsdk_dep)) |emSdkStep| {
+                    exe_lib.step.dependOn(&emSdkStep.step);
+                }
+
+                exe_lib.addIncludePath(emsdk_dep.path("upstream/emscripten/cache/sysroot/include"));
+
+                // Create the output directory because emcc can't do it.
+                const emccOutputDirExample = b.pathJoin(&.{ emccOutputDir, name, std.fs.path.sep_str });
+                const mkdir_command = switch (builtin.os.tag) {
+                    .windows => b.addSystemCommand(&.{ "cmd.exe", "/c", "if", "not", "exist", emccOutputDirExample, "mkdir", emccOutputDirExample }),
+                    else => b.addSystemCommand(&.{ "mkdir", "-p", emccOutputDirExample }),
+                };
+
+                const emcc_exe = switch (builtin.os.tag) {
+                    .windows => "emcc.bat",
+                    else => "emcc",
+                };
+
+                const emcc_exe_path = b.pathJoin(&.{ emsdk_dep.path("upstream/emscripten").getPath(b), emcc_exe });
+                const emcc_command = b.addSystemCommand(&[_][]const u8{emcc_exe_path});
+                emcc_command.step.dependOn(&mkdir_command.step);
+                const emccOutputDirExampleWithFile = b.pathJoin(&.{ emccOutputDir, name, std.fs.path.sep_str, emccOutputFile });
+                emcc_command.addArgs(&[_][]const u8{
+                    "-o",
+                    emccOutputDirExampleWithFile,
+                    "-sFULL-ES3=1",
+                    "-sUSE_GLFW=3",
+                    "-sSTACK_OVERFLOW_CHECK=1",
+                    "-sEXPORTED_RUNTIME_METHODS=['requestFullscreen']",
+                    "-sASYNCIFY",
+                    "-O0",
+                    "--emrun",
+                    "--preload-file",
+                    module_resources,
+                    "--shell-file",
+                    b.path("src/shell.html").getPath(b),
+                });
+
+                const link_items: []const *std.Build.Step.Compile = &.{
+                    raylib,
+                    exe_lib,
+                };
+                for (link_items) |item| {
+                    emcc_command.addFileArg(item.getEmittedBin());
+                    emcc_command.step.dependOn(&item.step);
+                }
+
+                const run_step = try emscriptenRunStep(b, emsdk_dep, emccOutputDirExampleWithFile);
+                run_step.step.dependOn(&emcc_command.step);
+                run_step.addArg("--no_browser");
+                const run_option = b.step(name, name);
+
+                run_option.dependOn(&run_step.step);
+
+                all.dependOn(&emcc_command.step);
+            }
+        } else {
             const exe = b.addExecutable(.{
                 .name = name,
                 .target = target,
@@ -596,6 +697,7 @@ fn addExamples(
 
             all.dependOn(&install_cmd.step);
         }
+    }
     return all;
 }
 

examples/shaders/resources/shaders/glsl100/pbr.vs

@@ -4,7 +4,7 @@
 attribute vec3 vertexPosition;
 attribute vec2 vertexTexCoord;
 attribute vec3 vertexNormal;
-attribute vec3 vertexTangent;
+attribute vec4 vertexTangent;
 attribute vec4 vertexColor;
 
 // Input uniform values
@@ -52,7 +52,7 @@ mat3 transpose(mat3 m)
 void main()
 {
     // Compute binormal from vertex normal and tangent
-    vec3 vertexBinormal = cross(vertexNormal, vertexTangent);
+    vec3 vertexBinormal = cross(vertexNormal, vertexTangent.xyz) * vertexTangent.w;
 
     // Compute fragment normal based on normal transformations
     mat3 normalMatrix = transpose(inverse(mat3(matModel)));
@@ -62,7 +62,7 @@ void main()
 
     fragTexCoord = vertexTexCoord*2.0;
     fragNormal = normalize(normalMatrix*vertexNormal);
-    vec3 fragTangent = normalize(normalMatrix*vertexTangent);
+    vec3 fragTangent = normalize(normalMatrix*vertexTangent.xyz);
     fragTangent = normalize(fragTangent - dot(fragTangent, fragNormal)*fragNormal);
     vec3 fragBinormal = normalize(normalMatrix*vertexBinormal);
     fragBinormal = cross(fragNormal, fragTangent);

examples/shaders/resources/shaders/glsl120/pbr.vs

@@ -4,7 +4,7 @@
 attribute vec3 vertexPosition;
 attribute vec2 vertexTexCoord;
 attribute vec3 vertexNormal;
-attribute vec3 vertexTangent;
+attribute vec4 vertexTangent;
 attribute vec4 vertexColor;
 
 // Input uniform values
@@ -52,7 +52,7 @@ mat3 transpose(mat3 m)
 void main()
 {
     // Compute binormal from vertex normal and tangent
-    vec3 vertexBinormal = cross(vertexNormal, vertexTangent);
+    vec3 vertexBinormal = cross(vertexNormal, vertexTangent.xyz) * vertexTangent.w;
 
     // Compute fragment normal based on normal transformations
     mat3 normalMatrix = transpose(inverse(mat3(matModel)));
@@ -62,7 +62,7 @@ void main()
 
     fragTexCoord = vertexTexCoord*2.0;
     fragNormal = normalize(normalMatrix*vertexNormal);
-    vec3 fragTangent = normalize(normalMatrix*vertexTangent);
+    vec3 fragTangent = normalize(normalMatrix*vertexTangent.xyz);
     fragTangent = normalize(fragTangent - dot(fragTangent, fragNormal)*fragNormal);
     vec3 fragBinormal = normalize(normalMatrix*vertexBinormal);
     fragBinormal = cross(fragNormal, fragTangent);

examples/shaders/resources/shaders/glsl330/pbr.vs

@@ -4,7 +4,7 @@
 in vec3 vertexPosition;
 in vec2 vertexTexCoord;
 in vec3 vertexNormal;
-in vec3 vertexTangent;
+in vec4 vertexTangent;
 in vec4 vertexColor;
 
 // Input uniform values
@@ -26,7 +26,7 @@ const float normalOffset = 0.1;
 void main()
 {
     // Compute binormal from vertex normal and tangent
-    vec3 vertexBinormal = cross(vertexNormal, vertexTangent);
+    vec3 vertexBinormal = cross(vertexNormal, vertexTangent.xyz) * vertexTangent.w;
 
     // Compute fragment normal based on normal transformations
     mat3 normalMatrix = transpose(inverse(mat3(matModel)));
@@ -36,7 +36,7 @@ void main()
 
     fragTexCoord = vertexTexCoord*2.0;
     fragNormal = normalize(normalMatrix*vertexNormal);
-    vec3 fragTangent = normalize(normalMatrix*vertexTangent);
+    vec3 fragTangent = normalize(normalMatrix*vertexTangent.xyz);
     fragTangent = normalize(fragTangent - dot(fragTangent, fragNormal)*fragNormal);
     vec3 fragBinormal = normalize(normalMatrix*vertexBinormal);
     fragBinormal = cross(fragNormal, fragTangent);

src/rmodels.c

@@ -5577,7 +5577,7 @@ static Model LoadGLTF(const char *fileName)
                         }
                         else TRACELOG(LOG_WARNING, "MODEL: [%s] Normal attribute data format not supported, use vec3 float", fileName);
                     }
-                    else if (mesh->primitives[p].attributes[j].type == cgltf_attribute_type_tangent)   // TANGENT, vec3, float
+                    else if (mesh->primitives[p].attributes[j].type == cgltf_attribute_type_tangent)   // TANGENT, vec4, float, w is tangent basis sign
                     {
                         cgltf_accessor *attribute = mesh->primitives[p].attributes[j].data;
 
@@ -5593,10 +5593,10 @@ static Model LoadGLTF(const char *fileName)
                             float *tangents = model.meshes[meshIndex].tangents;
                             for (unsigned int k = 0; k < attribute->count; k++)
                             {
-                                Vector3 tt = Vector3Transform((Vector3){ tangents[3*k], tangents[3*k+1], tangents[3*k+2] }, worldMatrix);
-                                tangents[3*k] = tt.x;
-                                tangents[3*k+1] = tt.y;
-                                tangents[3*k+2] = tt.z;
+                                Vector3 tt = Vector3Transform((Vector3){ tangents[4*k], tangents[4*k+1], tangents[4*k+2] }, worldMatrix);
+                                tangents[4*k] = tt.x;
+                                tangents[4*k+1] = tt.y;
+                                tangents[4*k+2] = tt.z;
                             }
                         }
                         else TRACELOG(LOG_WARNING, "MODEL: [%s] Tangent attribute data format not supported, use vec4 float", fileName);