update image material to support cubemaps

materials/image.mat

@@ -5,6 +5,10 @@ material {
             type : sampler2d,
             name : image
         },
+        {
+            type : samplerCubemap,
+            name : cubeMap
+        },
         {
             type : mat4,
             name : transform,
@@ -17,6 +21,14 @@ material {
         {
             type : int,
             name : showImage
+        },
+        {
+            type : int,
+            name : isCubeMap
+        },
+        {
+            type : int,
+            name : cubeMapFace
         }
     ],
     variables : [
@@ -36,14 +48,45 @@ vertex {
 }
 
 fragment {
+    vec3 getDirectionForCubeFace(int face, vec2 uv) {
+        vec2 st = uv * 2.0 - 1.0; // Convert [0,1] to [-1,1]
+        
+        if (face == 0) {        // +X
+            return normalize(vec3(1.0, -st.y, -st.x));
+        } else if (face == 1) { // -X
+            return normalize(vec3(-1.0, -st.y, st.x));
+        } else if (face == 2) { // +Y
+            return normalize(vec3(st.x, 1.0, st.y));
+        } else if (face == 3) { // -Y
+            return normalize(vec3(st.x, -1.0, -st.y));
+        } else if (face == 4) { // +Z
+            return normalize(vec3(st.x, -st.y, 1.0));
+        } else {                // -Z (face == 5)
+            return normalize(vec3(-st.x, -st.y, -1.0));
+        }
+    }
+
     void material(inout MaterialInputs material) {
-       prepareMaterial(material);
+        prepareMaterial(material);
-       highp vec2 uv = (materialParams.transform * vec4(saturate(variable_imageUV.st), 1.0, 1.0)).st;
+        highp vec2 uv = (materialParams.transform * vec4(saturate(variable_imageUV.st), 1.0, 1.0)).st;
+        
         if (materialParams.showImage == 0 || uv.s > 1.0 || uv.s < 0.0 || uv.t < 0.0 || uv.t > 1.0) {
             material.baseColor = materialParams.backgroundColor;
         } else {
-            uv.t = 1.0 - uv.t;
+            vec4 color;
-            vec4 color = max(texture(materialParams_image, uv.st), 0.0);
+            
+            if (materialParams.isCubeMap != 0) {
+                // Sample cubemap using direction vector for specified face
+                vec2 cubeUv = uv;
+                cubeUv.t = 1.0 - cubeUv.t; // Flip V coordinate
+                vec3 direction = getDirectionForCubeFace(materialParams.cubeMapFace, cubeUv);
+                color = max(texture(materialParams_cubeMap, direction), 0.0);
+            } else {
+                // Regular 2D texture sampling
+                uv.t = 1.0 - uv.t;
+                color = max(texture(materialParams_image, uv.st), 0.0);
+            }
+            
             color.rgb *= color.a;
             // Manual, pre-multiplied srcOver with opaque destination optimization
             material.baseColor.rgb = color.rgb + materialParams.backgroundColor.rgb * (1.0 - color.a);

thermion_dart/native/include/material/image.S

@@ -8,5 +8,5 @@ IMAGE_PACKAGE:
 IMAGE_IMAGE_OFFSET:
     .int 0
 IMAGE_IMAGE_SIZE:
-    .int 63850
+    .int 78666
 

thermion_dart/native/include/material/image.apple.S

@@ -8,5 +8,5 @@ _IMAGE_PACKAGE:
 _IMAGE_IMAGE_OFFSET:
     .int 0
 _IMAGE_IMAGE_SIZE:
-    .int 63850
+    .int 78666