From 260374c14dfdb03e42dc1f2578af804e1269089c Mon Sep 17 00:00:00 2001
From: John Alanbrook <john@pockle.world>
Date: Thu, 16 Feb 2023 22:13:07 +0000
Subject: [PATCH] Wireframe display mode

---
 Makefile                                |  2 +-
 source/engine/ffi.c                     |  8 +++++++
 source/engine/openglrender.c            | 30 ++++++++++++++++++++-----
 source/engine/openglrender.h            |  1 +
 source/shaders/spritefrag.glsl          |  2 +-
 source/shaders/spritewireframefrag.glsl | 12 ++++++++++
 6 files changed, 47 insertions(+), 8 deletions(-)
 create mode 100644 source/shaders/spritewireframefrag.glsl

diff --git a/Makefile b/Makefile
index f2d2efa..ee40c04 100755
--- a/Makefile
+++ b/Makefile
@@ -73,7 +73,7 @@ SEM = 0.0.1
 COM != git rev-parse --short HEAD
 VER = $(SEM)-$(COM)
 
-COMPILER_FLAGS = $(includeflag) $(QFLAGS) -MD $(WARNING_FLAGS) -DCP_USE_DOUBLES=0 -DTINYSPLINE_FLOAT_PRECISION -DVER=\"$(VER)\" -DINFO=\"$(INFO)\" -c $< -o $@
+COMPILER_FLAGS = $(includeflag) $(QFLAGS) -MD $(WARNING_FLAGS) -DCP_USE_DOUBLES=0 -DTINYSPLINE_FLOAT_PRECISION -DDUK_USE_SYMBOL_BUILTIN -DVER=\"$(VER)\" -DINFO=\"$(INFO)\" -c $< -o $@
 
 LIBPATH = -L$(BIN)
 
diff --git a/source/engine/ffi.c b/source/engine/ffi.c
index 31f080f..e2b3b09 100644
--- a/source/engine/ffi.c
+++ b/source/engine/ffi.c
@@ -701,6 +701,14 @@ duk_ret_t duk_cmd(duk_context *duk) {
 	case 66:
 	  dukext2paths(duk_to_string(duk, 1));
 	  return 1;
+
+	case 67:
+	  opengl_rendermode(LIT);
+	  break;
+
+	case 68:
+	  opengl_rendermode(WIREFRAME);
+	  break;
     }
 
     return 0;
diff --git a/source/engine/openglrender.c b/source/engine/openglrender.c
index 73b1d8e..1a52f44 100644
--- a/source/engine/openglrender.c
+++ b/source/engine/openglrender.c
@@ -12,9 +12,10 @@
 #include "datastream.h"
 #include "nuke.h"
 
-int renderMode = 0;
+int renderMode = LIT;
 
 struct shader *spriteShader = NULL;
+struct shader *wireframeShader = NULL;
 struct shader *animSpriteShader = NULL;
 static struct shader *textShader;
 
@@ -64,6 +65,11 @@ void debug_draw_phys(int draw) {
     debugDrawPhysics = draw;
 }
 
+void opengl_rendermode(enum RenderMode r)
+{
+  renderMode = r;
+}
+
 void openglInit()
 {
     if (!mainwin) {
@@ -73,6 +79,7 @@ void openglInit()
 
     ////// MAKE SHADERS
     spriteShader = MakeShader("spritevert.glsl", "spritefrag.glsl");
+    wireframeShader = MakeShader("spritevert.glsl", "spritewireframefrag.glsl");
     animSpriteShader = MakeShader("animspritevert.glsl", "animspritefrag.glsl");
     textShader = MakeShader("textvert.glsl", "textfrag.glsl");
 
@@ -117,8 +124,8 @@ void add_zoom(float val) { zoom = val; }
 
 void openglRender(struct window *window)
 {
+    
     glCullFace(GL_BACK);
-
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     //////////// 2D projection
@@ -143,14 +150,25 @@ void openglRender(struct window *window)
     glBufferSubData(GL_UNIFORM_BUFFER, 0, 64, projection);
 
 
+    /* Game sprites */
+    switch (renderMode) {
+      case LIT:
+        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+	shader_use(spriteShader);
+	break;
+
+      case WIREFRAME:
+        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	shader_use(wireframeShader);
+	break;
+    };
+    
     glEnable(GL_DEPTH_TEST);
-    ///// Sprites
     glDepthFunc(GL_LESS);
-    shader_use(spriteShader);
     sprite_draw_all();
 
-
-
+    /* UI Elements & Debug elements */
+    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
     glDisable(GL_DEPTH_TEST);
     //// DEBUG
     if (debugDrawPhysics)
diff --git a/source/engine/openglrender.h b/source/engine/openglrender.h
index 287cc17..151bafb 100644
--- a/source/engine/openglrender.h
+++ b/source/engine/openglrender.h
@@ -40,6 +40,7 @@ enum RenderMode {
 
 void openglInit();
 void openglRender(struct window *window);
+void opengl_rendermode(enum RenderMode r);
 
 void openglInit3d(struct window *window);
 void openglRender3d(struct window *window, struct mCamera *camera);
diff --git a/source/shaders/spritefrag.glsl b/source/shaders/spritefrag.glsl
index 8215e64..fc643db 100644
--- a/source/shaders/spritefrag.glsl
+++ b/source/shaders/spritefrag.glsl
@@ -11,4 +11,4 @@ void main()
 
     if (color.a <= 0.1f)
         discard;
-}
\ No newline at end of file
+}
diff --git a/source/shaders/spritewireframefrag.glsl b/source/shaders/spritewireframefrag.glsl
new file mode 100644
index 0000000..39998ba
--- /dev/null
+++ b/source/shaders/spritewireframefrag.glsl
@@ -0,0 +1,12 @@
+#version 330 core
+in vec2 texcoords;
+out vec4 color;
+
+uniform sampler2D image;
+uniform vec3 spriteColor;
+
+void main()
+{
+    color = vec4(spriteColor, 1.f) * texture(image, texcoords);
+    color.a = 1.f;
+}