diff --git a/NEW_RELEASE_NOTES.md b/NEW_RELEASE_NOTES.md
index 8c601cd27a..977e98846d 100644
--- a/NEW_RELEASE_NOTES.md
+++ b/NEW_RELEASE_NOTES.md
@@ -15,3 +15,4 @@ appropriate header in [RELEASE_NOTES.md](./RELEASE_NOTES.md).
 - matc: Add support for post-process materials in feature level 0
 - engine: Add `Material::getFeatureLevel()`
 - engine: Add missing `Material::getReflectionMode()` method in Java
+- engine: Support basic usage of post-processing materials on feature level 0
diff --git a/filament/backend/src/opengl/GLUtils.h b/filament/backend/src/opengl/GLUtils.h
index 0c7bca140e..dc9df7871a 100644
--- a/filament/backend/src/opengl/GLUtils.h
+++ b/filament/backend/src/opengl/GLUtils.h
@@ -373,16 +373,19 @@ constexpr inline GLenum getCullingMode(CullingMode mode) noexcept {
 constexpr inline std::pair<GLenum, GLenum> textureFormatToFormatAndType(
         TextureFormat format) noexcept {
     switch (format) {
-        case TextureFormat::RGB8:       return { GL_RGB,                GL_UNSIGNED_BYTE };
-        case TextureFormat::RGBA8:      return { GL_RGBA,               GL_UNSIGNED_BYTE };
-        case TextureFormat::RGB565:     return { GL_RGB,                GL_UNSIGNED_SHORT_5_6_5 };
-        case TextureFormat::RGB5_A1:    return { GL_RGBA,               GL_UNSIGNED_SHORT_5_5_5_1 };
-        case TextureFormat::RGBA4:      return { GL_RGBA,               GL_UNSIGNED_SHORT_4_4_4_4 };
-        case TextureFormat::DEPTH16:    return { GL_DEPTH_COMPONENT,    GL_UNSIGNED_SHORT };
-        case TextureFormat::DEPTH24:    return { GL_DEPTH_COMPONENT,    GL_UNSIGNED_INT };
+        case TextureFormat::R8:         return { 0x1909 /*GL_LUMINANCE*/, GL_UNSIGNED_BYTE };
+        case TextureFormat::RGB8:       return { GL_RGB,                  GL_UNSIGNED_BYTE };
+        case TextureFormat::SRGB8:      return { GL_RGB,                  GL_UNSIGNED_BYTE };
+        case TextureFormat::RGBA8:      return { GL_RGBA,                 GL_UNSIGNED_BYTE };
+        case TextureFormat::SRGB8_A8:   return { GL_RGBA,                 GL_UNSIGNED_BYTE };
+        case TextureFormat::RGB565:     return { GL_RGB,                  GL_UNSIGNED_SHORT_5_6_5 };
+        case TextureFormat::RGB5_A1:    return { GL_RGBA,                 GL_UNSIGNED_SHORT_5_5_5_1 };
+        case TextureFormat::RGBA4:      return { GL_RGBA,                 GL_UNSIGNED_SHORT_4_4_4_4 };
+        case TextureFormat::DEPTH16:    return { GL_DEPTH_COMPONENT,      GL_UNSIGNED_SHORT };
+        case TextureFormat::DEPTH24:    return { GL_DEPTH_COMPONENT,      GL_UNSIGNED_INT };
         case TextureFormat::DEPTH24_STENCIL8:
-                                        return { GL_DEPTH24_STENCIL8,   GL_UNSIGNED_INT_24_8 };
-        default:                        return { GL_NONE,               GL_NONE };
+                                        return { GL_DEPTH24_STENCIL8,     GL_UNSIGNED_INT_24_8 };
+        default:                        return { GL_NONE,                 GL_NONE };
     }
 }
 
diff --git a/filament/backend/src/opengl/OpenGLDriver.cpp b/filament/backend/src/opengl/OpenGLDriver.cpp
index bbfb76a26a..9e9f1c8ace 100644
--- a/filament/backend/src/opengl/OpenGLDriver.cpp
+++ b/filament/backend/src/opengl/OpenGLDriver.cpp
@@ -1290,7 +1290,9 @@ void OpenGLDriver::createRenderTargetR(Handle<HwRenderTarget> rth,
                 checkDimensions(rt->gl.color[i], color[i].level);
             }
         }
-        glDrawBuffers((GLsizei)maxDrawBuffers, bufs);
+        if (UTILS_LIKELY(!getContext().isES2())) {
+            glDrawBuffers((GLsizei)maxDrawBuffers, bufs);
+        }
         CHECK_GL_ERROR(utils::slog.e)
     }
 #endif
@@ -1782,6 +1784,10 @@ bool OpenGLDriver::isRenderTargetFormatSupported(TextureFormat format) {
     // support more formats, but it requires querying GL_INTERNALFORMAT_SUPPORTED which is not
     // available in OpenGL ES.
     auto& gl = mContext;
+    if (UTILS_UNLIKELY(gl.isES2())) {
+        auto [es2format, type] = textureFormatToFormatAndType(format);
+        return es2format != GL_NONE && type != GL_NONE;
+    }
     switch (format) {
         // Core formats.
         case TextureFormat::R8:
@@ -2276,8 +2282,16 @@ void OpenGLDriver::setTextureData(GLTexture* t, uint32_t level,
         return;
     }
 
-    GLenum const glFormat = getFormat(p.format);
-    GLenum const glType = getType(p.type);
+    GLenum glFormat;
+    GLenum glType;
+    if (mContext.isES2()) {
+        auto formatAndType = textureFormatToFormatAndType(t->format);
+        glFormat = formatAndType.first;
+        glType = formatAndType.second;
+    } else {
+        glFormat = getFormat(p.format);
+        glType = getType(p.type);
+    }
 
 #ifndef FILAMENT_SILENCE_NOT_SUPPORTED_BY_ES2
     if (!gl.isES2()) {
diff --git a/libs/filamat/src/shaders/CodeGenerator.cpp b/libs/filamat/src/shaders/CodeGenerator.cpp
index 214ca50f3f..e1dbd80ba2 100644
--- a/libs/filamat/src/shaders/CodeGenerator.cpp
+++ b/libs/filamat/src/shaders/CodeGenerator.cpp
@@ -164,11 +164,13 @@ utils::io::sstream& CodeGenerator::generateProlog(utils::io::sstream& out, Shade
         mFeatureLevel >= FeatureLevel::FEATURE_LEVEL_1) {
         if (stage == ShaderStage::VERTEX) {
             generateDefine(out, "VARYING", "out");
+            generateDefine(out, "ATTRIBUTE", "in");
         } else if (stage == ShaderStage::FRAGMENT) {
             generateDefine(out, "VARYING", "in");
         }
     } else {
         generateDefine(out, "VARYING", "varying");
+        generateDefine(out, "ATTRIBUTE", "attribute");
     }
 
     auto getShadingDefine = [](Shading shading) -> const char* {
diff --git a/shaders/src/post_process_inputs.vs b/shaders/src/post_process_inputs.vs
index 1bbb1256a0..8b51a54234 100644
--- a/shaders/src/post_process_inputs.vs
+++ b/shaders/src/post_process_inputs.vs
@@ -1,4 +1,4 @@
-LAYOUT_LOCATION(LOCATION_POSITION) in vec4 position;
+LAYOUT_LOCATION(LOCATION_POSITION) ATTRIBUTE vec4 position;
 
 struct PostProcessVertexInputs {