From c6ead0aeb6b2ab78d7d77907b2180dea98dcb473 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Mon, 24 Aug 2020 21:21:58 -0400
Subject: render: Take a stab at GLSL 1.2 compatibility.

I don't have a machine to test on so this is just a best guess.  I'm
sure there's some bugs that other people will just have to point out
to me.  It's a start, at least.
---
 chickadee/render/phong.scm | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

(limited to 'chickadee/render/phong.scm')

diff --git a/chickadee/render/phong.scm b/chickadee/render/phong.scm
index 08bd7c7..1c718a8 100644
--- a/chickadee/render/phong.scm
+++ b/chickadee/render/phong.scm
@@ -118,18 +118,27 @@
 layout (location = 0) in vec3 position;
 layout (location = 1) in vec2 texcoord;
 layout (location = 2) in vec3 normal;
-#elif ifdef GLSL130
+#elif defined(GLSL130)
 in vec3 position;
 in vec2 texcoord;
 in vec3 normal;
+#elif defined(GLSL120)
+attribute vec3 position;
+attribute vec2 texcoord;
+attribute vec3 normal;
 #endif
 
 uniform mat4 model;
 uniform mat4 view;
 uniform mat4 projection;
 
+#ifdef GLSL120
+varying vec3 fragNorm;
+varying vec2 fragTex;
+#else
 out vec3 fragNorm;
 out vec2 fragTex;
+#endif
 
 void main() {
     gl_Position = projection * view * model * vec4(position, 1.0);
@@ -161,8 +170,13 @@ struct DirectionalLight {
     vec3 specular;
 };
 
+#ifdef GLSL120
+attribute vec3 fragNorm;
+attribute vec2 fragTex;
+#else
 in vec3 fragNorm;
 in vec2 fragTex;
+#endif
 
 #ifdef GLSL330
 out vec4 fragColor;
@@ -178,7 +192,7 @@ void main() {
     if(material.useAmbientMap) {
 #ifdef GLSL330
         baseAmbientColor = texture(material.ambientMap, fragTex).xyz;
-#elif ifdef GLSL130
+#else
          baseAmbientColor = texture2D(material.ambientMap, fragTex).xyz;
 #endif
     } else {
@@ -188,7 +202,7 @@ void main() {
          // discard transparent fragments.
 #ifdef GLSL330
          vec4 color = texture(material.diffuseMap, fragTex);
-#elif ifdef GLSL130
+#else
          vec4 color = texture2D(material.diffuseMap, fragTex);
 #endif
          if(color.a == 0.0) { discard; }
@@ -199,7 +213,7 @@ void main() {
     if(material.useSpecularMap) {
 #ifdef GLSL330
          baseSpecularColor = texture(material.specularMap, fragTex).xyz;
-#elif ifdef GLSL130
+#else
          baseSpecularColor = texture2D(material.specularMap, fragTex).xyz;
 #endif
     } else {
@@ -217,7 +231,7 @@ void main() {
     vec3 specularColor = specularFactor * baseSpecularColor * material.specular;
 #ifdef GLSL330
     fragColor = vec4(ambientColor + diffuseColor + specularColor, 1.0);
-#elif ifdef GLSL130
+#else
     gl_FragColor = vec4(ambientColor + diffuseColor + specularColor, 1.0);
 #endif
 }
-- 
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