From: patrick-scho <patrick.schoenberger@posteo.de>
Date: Wed, 20 Aug 2025 11:59:44 +0000 (+0200)
Subject: move shader, update build.zig
X-Git-Url: https://gitweb.ps.run/sporegirl/commitdiff_plain/85192a41f309b9cd98900f284e5a56e0dc22bccc

move shader, update build.zig
---

diff --git a/build.zig b/build.zig
index 590d913..0fe3fbf 100644
--- a/build.zig
+++ b/build.zig
@@ -10,11 +10,9 @@ pub fn build(b: *Build) !void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
-    const opt_docking = b.option(bool, "docking", "Build with docking support") orelse false;
-
     // Get the matching Zig module name, C header search path and C library for
     // vanilla imgui vs the imgui docking branch.
-    const cimgui_conf = cimgui.getConfig(opt_docking);
+    const cimgui_conf = cimgui.getConfig(true);
 
     // note that the sokol dependency is built with `.with_sokol_imgui = true`
     const dep_sokol = b.dependency("sokol", .{
@@ -35,8 +33,8 @@ pub fn build(b: *Build) !void {
     const dep_shdc = dep_sokol.builder.dependency("shdc", .{});
     const shdc_step = try sokol.shdc.createSourceFile(b, .{
         .shdc_dep = dep_shdc,
-        .input = "src/shader/quad.glsl",
-        .output = "src/shader/quad.glsl.zig",
+        .input = "shd/quad.glsl",
+        .output = "src/shd/quad.glsl.zig",
         .slang = .{ .glsl430 = true },
     });
 
@@ -49,10 +47,11 @@ pub fn build(b: *Build) !void {
             .{ .name = "sokol", .module = dep_sokol.module("sokol") },
             .{ .name = cimgui_conf.module_name, .module = dep_cimgui.module(cimgui_conf.module_name) },
         },
+        .link_libc = true,
     });
-    const mod_options = b.addOptions();
-    mod_options.addOption(bool, "docking", opt_docking);
-    mod_main.addOptions("build_options", mod_options);
+    
+    mod_main.addIncludePath(b.path("src"));
+    mod_main.addCSourceFile(.{.file = b.path("src/stb_image.c")});
 
     // from here on different handling for native vs wasm builds
     if (target.result.cpu.arch.isWasm()) {
diff --git a/shd/quad.glsl b/shd/quad.glsl
new file mode 100644
index 0000000..7f073c4
--- /dev/null
+++ b/shd/quad.glsl
@@ -0,0 +1,153 @@
+/* quad vertex shader */
+@vs vs
+const vec2 positions[4] = { vec2(0, 1), vec2(1, 1), vec2(1, 0), vec2(0, 0) };
+const vec2 uvs[4] = { vec2(0, 0), vec2(1, 0), vec2(1, 1), vec2(0, 1) };
+const int indices[6] = { 0, 1, 2, 0, 2, 3 };
+
+layout(binding=0) uniform Game
+{
+    vec2 screen;
+    vec2 cam;
+};
+
+in vec2 inst_pos;
+in ivec2 inst_size;
+out vec2 uv;
+
+void main() {
+    int idx = indices[gl_VertexIndex];
+    vec2 pos = positions[idx];
+    uv = uvs[idx];
+
+    vec2 inst_pos_abs = inst_pos + inst_size * pos - cam - screen / 2;
+    gl_Position = vec4(inst_pos_abs / screen * 2, 1, 1);
+}
+@end
+
+/* quad fragment shader */
+@fs fs
+layout(binding=0) uniform texture2D tex;
+layout(binding=0) uniform sampler smp;
+
+in vec2 uv;
+out vec4 frag_color;
+
+void main() {
+    vec4 tex_color = texture(sampler2D(tex, smp), uv);
+    if (tex_color.a < 1)
+        discard;
+    frag_color = tex_color;
+}
+@end
+
+/* quad shader program */
+@program quad vs fs
+
+
+
+
+
+@vs vs_shadow
+const vec2 positions[4] = { vec2(0, 1), vec2(1, 1), vec2(1, 0), vec2(0, 0) };
+const vec2 uvs[4] = { vec2(0, 0), vec2(1, 0), vec2(1, 1), vec2(0, 1) };
+const int indices[6] = { 0, 1, 2, 0, 2, 3 };
+
+layout(binding=0) uniform Game
+{
+    vec2 screen;
+    vec2 cam;
+};
+
+layout(binding=1) uniform Light
+{
+    vec2 light_pos;
+};
+
+in vec2 inst_pos;
+in ivec2 inst_size;
+out vec2 uv;
+
+vec2 rotate(vec2 v, float a) {
+	float s = sin(a);
+	float c = cos(a);
+	mat2 m = mat2(c, s, -s, c);
+	return m * v;
+}
+
+void main() {
+    int idx = indices[gl_VertexIndex];
+    vec2 pos = positions[idx];
+    uv = uvs[idx];
+
+    if (idx == 2 || idx == 3) { // keep pos for lower vertices (base)
+        vec2 inst_pos_abs = inst_pos + inst_size * pos - cam - screen / 2;
+        gl_Position = vec4(inst_pos_abs / screen * 2, 1, 1);
+    }
+    else {
+        vec2 anchor = vec2(0.5, 0);
+        vec2 anchor_abs = inst_pos + inst_size * anchor - cam - screen / 2;
+        vec2 light_pos_abs = light_pos - cam - screen / 2;
+        vec2 dir = anchor_abs - light_pos_abs;
+
+        vec2 left_right[] = {
+            rotate(dir, 1.5708),
+            rotate(dir, -1.5708),
+        };
+
+        vec2 inst_pos_abs = anchor_abs + dir + left_right[idx] / 2;
+        gl_Position = vec4(inst_pos_abs / screen * 2, 1, 1);
+    }
+}
+@end
+
+@fs fs_shadow
+layout(binding=0) uniform texture2D tex;
+layout(binding=0) uniform sampler smp;
+
+in vec2 uv;
+out vec4 frag_color;
+
+void main() {
+    vec4 tex_color = texture(sampler2D(tex, smp), uv);
+    // if (tex_color.a < 1)
+    //     discard;
+    frag_color = vec4(0, 0, 0, 1);
+}
+@end
+
+@program shadow vs_shadow fs_shadow
+
+
+
+@vs vs_light
+const vec2 positions[4] = { vec2(-0.5, 0.5), vec2(0.5, 0.5), vec2(0.5, -0.5), vec2(-0.5, -0.5) };
+const int indices[6] = { 0, 1, 2, 0, 2, 3 };
+
+layout(binding=0) uniform Game
+{
+    vec2 screen;
+    vec2 cam;
+};
+
+in vec2 light_pos;
+
+void main() {
+    int idx = indices[gl_VertexIndex];
+    vec2 pos = positions[idx];
+
+    vec2 light_size = vec2(10, 10);
+
+    vec2 inst_pos_abs = light_pos + light_size * pos - cam - screen / 2;
+    gl_Position = vec4(inst_pos_abs / screen * 2, 1, 1);
+}
+@end
+
+@fs fs_light
+out vec4 frag_color;
+
+void main() {
+    frag_color = vec4(1, 0, 0, 1);
+}
+@end
+
+@program light vs_light fs_light
diff --git a/src/shader/quad.glsl b/src/shader/quad.glsl
deleted file mode 100644
index b3e7e5c..0000000
--- a/src/shader/quad.glsl
+++ /dev/null
@@ -1,25 +0,0 @@
-/* quad vertex shader */
-@vs vs
-in vec4 position;
-in vec4 color0;
-out vec4 color;
-
-void main() {
-    gl_Position = position;
-    color = color0;
-}
-@end
-
-/* quad fragment shader */
-@fs fs
-in vec4 color;
-out vec4 frag_color;
-
-void main() {
-    frag_color = color;
-}
-@end
-
-/* quad shader program */
-@program quad vs fs
-