Fixes gl state after HDR texture functions. (#1621)

Updates skybox demo to show how to do both HDR and non HDR skyboxes

Co-authored-by: Jeffery Myers <[email protected]>

3 files changed, 12 insertions, 6 deletions

diff --git a/examples/models/resources/shaders/glsl100/skybox.fs b/examples/models/resources/shaders/glsl100/skybox.fs
index 1269a96d..4aa4ec9c 100644
--- a/examples/models/resources/shaders/glsl100/skybox.fs
+++ b/examples/models/resources/shaders/glsl100/skybox.fs
@@ -8,6 +8,7 @@ varying vec3 fragPosition;
 // Input uniform values
 uniform samplerCube environmentMap;
 uniform bool vflipped;
+uniform bool doGamma;
 
 void main()
 {
@@ -19,9 +20,11 @@ void main()
 
     vec3 color = vec3(texelColor.x, texelColor.y, texelColor.z);
     
-    // Apply gamma correction
-    color = color/(color + vec3(1.0));
-    color = pow(color, vec3(1.0/2.2));
+    if (doGamma)// Apply gamma correction
+    {
+        color = color/(color + vec3(1.0));
+        color = pow(color, vec3(1.0/2.2));
+    }
 
     // Calculate final fragment color
     gl_FragColor = vec4(color, 1.0);
diff --git a/examples/models/resources/shaders/glsl330/skybox.fs b/examples/models/resources/shaders/glsl330/skybox.fs
index dd8078e0..800c1c6f 100644
--- a/examples/models/resources/shaders/glsl330/skybox.fs
+++ b/examples/models/resources/shaders/glsl330/skybox.fs
@@ -16,6 +16,7 @@ in vec3 fragPosition;
 // Input uniform values
 uniform samplerCube environmentMap;
 uniform bool vflipped;
+uniform bool doGamma;
 
 // Output fragment color
 out vec4 finalColor;
@@ -28,9 +29,11 @@ void main()
     if (vflipped) color = texture(environmentMap, vec3(fragPosition.x, -fragPosition.y, fragPosition.z)).rgb;
     else color = texture(environmentMap, fragPosition).rgb;
 
-    // Apply gamma correction
-    color = color/(color + vec3(1.0));
-    color = pow(color, vec3(1.0/2.2));
+    if (doGamma)// Apply gamma correction
+    { 
+        color = color/(color + vec3(1.0));
+        color = pow(color, vec3(1.0/2.2));
+    }
 
     // Calculate final fragment color
     finalColor = vec4(color, 1.0);
diff --git a/examples/models/resources/skybox.png b/examples/models/resources/skybox.png
new file mode 100644
index 00000000..36a79b2d
--- /dev/null
+++ b/examples/models/resources/skybox.png