From b6a666e96ffd04bd6d52be8fd9899faf27b751db Mon Sep 17 00:00:00 2001
From: mattkae <mattkae@protonmail.com>
Date: Mon, 31 Jul 2023 07:31:52 -0400
Subject: Some initial shader loading work

---
 themes/src/Renderer2d.cpp            | 10 ++++++----
 themes/src/Renderer2d.h              |  5 ++++-
 themes/src/_shaders/renderer2d.frag  |  0
 themes/src/_shaders/renderer2d.vert  |  0
 themes/src/_shaders/renderer3d.frag  |  7 +++++++
 themes/src/_shaders/renderer3d.vert  | 15 +++++++++++++++
 themes/src/_shaders/sun.vert         |  0
 themes/src/main.cpp                  |  5 ++---
 themes/src/shaders/renderer2d.frag   |  0
 themes/src/shaders/renderer2d.vert   |  0
 themes/src/shaders/renderer2d_frag.h |  4 ++++
 themes/src/shaders/renderer2d_vert.h |  4 ++++
 themes/src/shaders/renderer3d.frag   |  7 -------
 themes/src/shaders/renderer3d.vert   | 15 ---------------
 themes/src/shaders/renderer3d_frag.h | 11 +++++++++++
 themes/src/shaders/renderer3d_vert.h | 19 +++++++++++++++++++
 themes/src/shaders/sun_vert.h        |  4 ++++
 themes/src/summer/SummerTheme.cpp    |  3 ++-
 themes/src/summer/SummerTheme.h      |  2 +-
 themes/src/tools/shader.js           | 30 ++++++++++++++++++++++++++++++
 20 files changed, 109 insertions(+), 32 deletions(-)
 create mode 100644 themes/src/_shaders/renderer2d.frag
 create mode 100644 themes/src/_shaders/renderer2d.vert
 create mode 100644 themes/src/_shaders/renderer3d.frag
 create mode 100644 themes/src/_shaders/renderer3d.vert
 create mode 100644 themes/src/_shaders/sun.vert
 delete mode 100644 themes/src/shaders/renderer2d.frag
 delete mode 100644 themes/src/shaders/renderer2d.vert
 create mode 100644 themes/src/shaders/renderer2d_frag.h
 create mode 100644 themes/src/shaders/renderer2d_vert.h
 delete mode 100644 themes/src/shaders/renderer3d.frag
 delete mode 100644 themes/src/shaders/renderer3d.vert
 create mode 100644 themes/src/shaders/renderer3d_frag.h
 create mode 100644 themes/src/shaders/renderer3d_vert.h
 create mode 100644 themes/src/shaders/sun_vert.h
 create mode 100644 themes/src/tools/shader.js

(limited to 'themes/src')

diff --git a/themes/src/Renderer2d.cpp b/themes/src/Renderer2d.cpp
index c303e83..06f0838 100644
--- a/themes/src/Renderer2d.cpp
+++ b/themes/src/Renderer2d.cpp
@@ -6,7 +6,7 @@
 
 // Note: In the 'transform' attribute, the transform.x is the scale,
 // transform.y is the rotation, and transform.zw is the translation.
-const char* Vertex2DShader = 
+const char* DEFAULT_VERTEX_SHADER = 
 "attribute vec2 position; \n"
 "attribute vec4 color; \n"
 "attribute mat4 vMatrix; \n"
@@ -19,16 +19,18 @@ const char* Vertex2DShader =
 "    VertexColor = color; \n"
 "}";
 
-const char* renderer2dFragmentShader = 
+const char* DEFAULT_FRAGMENT_SHADER = 
 "varying lowp vec4 VertexColor; \n"
 "void main() { \n"
 "    gl_FragColor = VertexColor; \n"
 "}";
 
-void Renderer2d::load(WebglContext* inContext) {
+void Renderer2d::load(WebglContext* inContext, const char* inVertexShader, const char* inFragmentShader) {
+    auto vertexShader = inVertexShader ? inVertexShader : DEFAULT_VERTEX_SHADER;
+    auto fragmentShader = inFragmentShader ? inFragmentShader : DEFAULT_FRAGMENT_SHADER;
 	context = inContext;
 	printf("Compiling Renderer2d shader...\n");
-	shader = loadShader(Vertex2DShader, renderer2dFragmentShader);
+	shader = loadShader(vertexShader, fragmentShader);
 
 	useShader(shader);
 	attributes.position = getShaderAttribute(shader, "position");
diff --git a/themes/src/Renderer2d.h b/themes/src/Renderer2d.h
index 909f088..8a96503 100644
--- a/themes/src/Renderer2d.h
+++ b/themes/src/Renderer2d.h
@@ -7,6 +7,7 @@
 
 struct WebglContext;
 
+/// Responsible for rendering Mesh2Ds
 struct Renderer2d {
 	WebglContext* context = NULL;
 	Mat4x4 projection;
@@ -24,7 +25,9 @@ struct Renderer2d {
 		i32 model;
 	} uniforms;
 
-	void load(WebglContext* context);
+    /// Load with the provided context and shader programs. If the shaders are NULL, the default
+    /// shader is used
+	void load(WebglContext* context, const char* vertexShader = NULL, const char* fragmentShader = NULL);
 	void render();
 	void unload();
 };
diff --git a/themes/src/_shaders/renderer2d.frag b/themes/src/_shaders/renderer2d.frag
new file mode 100644
index 0000000..e69de29
diff --git a/themes/src/_shaders/renderer2d.vert b/themes/src/_shaders/renderer2d.vert
new file mode 100644
index 0000000..e69de29
diff --git a/themes/src/_shaders/renderer3d.frag b/themes/src/_shaders/renderer3d.frag
new file mode 100644
index 0000000..2f50347
--- /dev/null
+++ b/themes/src/_shaders/renderer3d.frag
@@ -0,0 +1,7 @@
+varying lowp vec4 VertexColor;
+varying lowp vec4 VertexNormal;
+
+void main() {
+    const lowp vec3 lightDirection = vec3(0.0, 1.0, 0.0);
+    gl_FragColor = vec4(VertexColor.xyz * dot(VertexNormal.xyz, lightDirection), 1);
+}
diff --git a/themes/src/_shaders/renderer3d.vert b/themes/src/_shaders/renderer3d.vert
new file mode 100644
index 0000000..026285f
--- /dev/null
+++ b/themes/src/_shaders/renderer3d.vert
@@ -0,0 +1,15 @@
+attribute vec4 position;
+attribute vec4 color;
+attribute vec4 normal;
+uniform mat4 projection;
+uniform mat4 view;
+uniform mat4 model;
+varying lowp vec4 VertexColor;
+varying lowp vec4 VertexNormal;
+
+void main() {
+    vec4 fragmentPosition = projection * view * model * position;
+    gl_Position = fragmentPosition;
+    VertexColor = color;
+    VertexNormal = normal;
+}
diff --git a/themes/src/_shaders/sun.vert b/themes/src/_shaders/sun.vert
new file mode 100644
index 0000000..e69de29
diff --git a/themes/src/main.cpp b/themes/src/main.cpp
index 4e1a646..297a498 100644
--- a/themes/src/main.cpp
+++ b/themes/src/main.cpp
@@ -74,8 +74,7 @@ void load(Theme theme) {
 		break;
     }
 	case Theme::Summer:
-		renderer2d.load(&context);
-		summerTheme.load(&renderer2d);
+		summerTheme.load(&renderer2d, &context);
 		break;
 	default:
 		break;
@@ -177,4 +176,4 @@ EM_BOOL selectSummer(int eventType, const EmscriptenMouseEvent* mouseEvent, void
 	printf("Summer theme selected\n");
 	load(Theme::Summer);
 	return true;
-}
\ No newline at end of file
+}
diff --git a/themes/src/shaders/renderer2d.frag b/themes/src/shaders/renderer2d.frag
deleted file mode 100644
index e69de29..0000000
diff --git a/themes/src/shaders/renderer2d.vert b/themes/src/shaders/renderer2d.vert
deleted file mode 100644
index e69de29..0000000
diff --git a/themes/src/shaders/renderer2d_frag.h b/themes/src/shaders/renderer2d_frag.h
new file mode 100644
index 0000000..6f5e472
--- /dev/null
+++ b/themes/src/shaders/renderer2d_frag.h
@@ -0,0 +1,4 @@
+#ifndef SHADER_RENDERER2D_FRAG 
+#define SHADER_RENDERER2D_FRAG 
+const char* shader_renderer2d_frag = " \n";
+#endif
diff --git a/themes/src/shaders/renderer2d_vert.h b/themes/src/shaders/renderer2d_vert.h
new file mode 100644
index 0000000..b32cf9f
--- /dev/null
+++ b/themes/src/shaders/renderer2d_vert.h
@@ -0,0 +1,4 @@
+#ifndef SHADER_RENDERER2D_VERT 
+#define SHADER_RENDERER2D_VERT 
+const char* shader_renderer2d_vert = " \n";
+#endif
diff --git a/themes/src/shaders/renderer3d.frag b/themes/src/shaders/renderer3d.frag
deleted file mode 100644
index 2f50347..0000000
--- a/themes/src/shaders/renderer3d.frag
+++ /dev/null
@@ -1,7 +0,0 @@
-varying lowp vec4 VertexColor;
-varying lowp vec4 VertexNormal;
-
-void main() {
-    const lowp vec3 lightDirection = vec3(0.0, 1.0, 0.0);
-    gl_FragColor = vec4(VertexColor.xyz * dot(VertexNormal.xyz, lightDirection), 1);
-}
diff --git a/themes/src/shaders/renderer3d.vert b/themes/src/shaders/renderer3d.vert
deleted file mode 100644
index 026285f..0000000
--- a/themes/src/shaders/renderer3d.vert
+++ /dev/null
@@ -1,15 +0,0 @@
-attribute vec4 position;
-attribute vec4 color;
-attribute vec4 normal;
-uniform mat4 projection;
-uniform mat4 view;
-uniform mat4 model;
-varying lowp vec4 VertexColor;
-varying lowp vec4 VertexNormal;
-
-void main() {
-    vec4 fragmentPosition = projection * view * model * position;
-    gl_Position = fragmentPosition;
-    VertexColor = color;
-    VertexNormal = normal;
-}
diff --git a/themes/src/shaders/renderer3d_frag.h b/themes/src/shaders/renderer3d_frag.h
new file mode 100644
index 0000000..6b3a936
--- /dev/null
+++ b/themes/src/shaders/renderer3d_frag.h
@@ -0,0 +1,11 @@
+#ifndef SHADER_RENDERER3D_FRAG 
+#define SHADER_RENDERER3D_FRAG 
+const char* shader_renderer3d_frag = "varying lowp vec4 VertexColor; \n"
+"varying lowp vec4 VertexNormal; \n"
+" \n"
+"void main() { \n"
+"    const lowp vec3 lightDirection = vec3(0.0, 1.0, 0.0); \n"
+"    gl_FragColor = vec4(VertexColor.xyz * dot(VertexNormal.xyz, lightDirection), 1); \n"
+"} \n"
+" \n";
+#endif
diff --git a/themes/src/shaders/renderer3d_vert.h b/themes/src/shaders/renderer3d_vert.h
new file mode 100644
index 0000000..20e69f9
--- /dev/null
+++ b/themes/src/shaders/renderer3d_vert.h
@@ -0,0 +1,19 @@
+#ifndef SHADER_RENDERER3D_VERT 
+#define SHADER_RENDERER3D_VERT 
+const char* shader_renderer3d_vert = "attribute vec4 position; \n"
+"attribute vec4 color; \n"
+"attribute vec4 normal; \n"
+"uniform mat4 projection; \n"
+"uniform mat4 view; \n"
+"uniform mat4 model; \n"
+"varying lowp vec4 VertexColor; \n"
+"varying lowp vec4 VertexNormal; \n"
+" \n"
+"void main() { \n"
+"    vec4 fragmentPosition = projection * view * model * position; \n"
+"    gl_Position = fragmentPosition; \n"
+"    VertexColor = color; \n"
+"    VertexNormal = normal; \n"
+"} \n"
+" \n";
+#endif
diff --git a/themes/src/shaders/sun_vert.h b/themes/src/shaders/sun_vert.h
new file mode 100644
index 0000000..2f9bf69
--- /dev/null
+++ b/themes/src/shaders/sun_vert.h
@@ -0,0 +1,4 @@
+#ifndef SHADER_SUN_VERT 
+#define SHADER_SUN_VERT 
+const char* shader_sun_vert = " \n";
+#endif
diff --git a/themes/src/summer/SummerTheme.cpp b/themes/src/summer/SummerTheme.cpp
index 406cd22..81cc43b 100644
--- a/themes/src/summer/SummerTheme.cpp
+++ b/themes/src/summer/SummerTheme.cpp
@@ -4,7 +4,8 @@
 #include "../mathlib.h"
 #include <vector>
 
-void SummerTheme::load(Renderer2d* renderer) {
+void SummerTheme::load(Renderer2d* renderer, WebglContext* context) {
+    renderer->load(context);
 	renderer->clearColor = Vector4(0, 181, 286, 255.f).toNormalizedColor();
 	sun.sectors = 180;
 	sun.radius = renderer->context->width / 4.f;
diff --git a/themes/src/summer/SummerTheme.h b/themes/src/summer/SummerTheme.h
index 4a9f76b..dad4ac9 100644
--- a/themes/src/summer/SummerTheme.h
+++ b/themes/src/summer/SummerTheme.h
@@ -16,7 +16,7 @@ struct Sun {
 
 struct SummerTheme {
 	Sun sun;
-	void load(Renderer2d* renderer);
+	void load(Renderer2d*, WebglContext*);
 	void update(f32 dtSeconds);
 	void render(Renderer2d* renderer);
 	void unload();
diff --git a/themes/src/tools/shader.js b/themes/src/tools/shader.js
new file mode 100644
index 0000000..27c8682
--- /dev/null
+++ b/themes/src/tools/shader.js
@@ -0,0 +1,30 @@
+/*
+  Responsible for generating .h files from GLSL files.
+ */
+
+
+const path = require('path');
+const fs = require('fs');
+const directory = path.join(__dirname, "..", "_shaders");
+const out_directory = path.join(__dirname, "..", "shaders");
+
+const files = fs.readdirSync(directory);
+files.forEach(file => {
+  const filePath = path.join(directory, file);
+  const text = String(fs.readFileSync(filePath));
+  const splitText = text.split('\n');
+  const splitName = file.split('.');
+  const def = `SHADER_${splitName.join('_').toUpperCase()}`;
+  let result = `#ifndef ${def} \n`;
+  result += `#define ${def} \n`;
+  result += `const char* ${def.toLowerCase()} = `
+  splitText.forEach((line, index) => {
+    result += "\"" + line + " \\n\"";
+    if (index == splitText.length - 1)
+      result += ";\n";
+    else
+      result += "\n";
+  });
+  result += '#endif\n';
+  fs.writeFileSync(path.join(out_directory, splitName.join('_') + '.h'), result);
+});
-- 
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