diff --git a/src/pc/gfx/gfx_vulkan.cpp b/src/pc/gfx/gfx_vulkan.cpp
index 94222fb..c862ac8 100644
--- a/src/pc/gfx/gfx_vulkan.cpp
+++ b/src/pc/gfx/gfx_vulkan.cpp
@@ -317,6 +317,10 @@ static std::string gfx_vulkan_create_fragment_shader(CCFeatures features) {
 
     src += ";\n";
 
+    if(features.opt_texture_edge && features.opt_alpha) {
+        src += "if (texel.a > 0.3) texel.a = 1.0; else discard;";
+    }
+
     if(uses_alpha) {
         src += "out_color = texel;\n";
     } else {
@@ -498,7 +502,9 @@ static std::tuple<VkPipeline, VkPipelineLayout, VkDescriptorSetLayout> gfx_vulka
     const std::array dynamic_states = { VK_DYNAMIC_STATE_VIEWPORT,
                                         VK_DYNAMIC_STATE_SCISSOR,
                                         VK_DYNAMIC_STATE_DEPTH_WRITE_ENABLE,
-                                        VK_DYNAMIC_STATE_DEPTH_TEST_ENABLE };
+                                        VK_DYNAMIC_STATE_DEPTH_TEST_ENABLE,
+                                        VK_DYNAMIC_STATE_DEPTH_BIAS,
+                                        VK_DYNAMIC_STATE_DEPTH_BIAS_ENABLE };
 
     VkPipelineDynamicStateCreateInfo dynamic_state = {};
     dynamic_state.sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
@@ -1233,8 +1239,6 @@ static void gfx_vulkan_renderer_start_frame(void) {
 static void gfx_vulkan_renderer_select_texture(int tile, uint32_t texture_id) {
     last_tile = tile;
     bound_textures[last_tile] = texture_id;
-
-    printf("selecting texture %d in slot %d\n", texture_id, tile);
 }
 
 static VkCommandBuffer gfx_vulkan_begin_singletime_commands() {
@@ -1457,6 +1461,11 @@ static void gfx_vulkan_renderer_set_depth_mask(bool z_upd) {
 }
 
 static void gfx_vulkan_renderer_set_zmode_decal(bool zmode_decal) {
+    vkCmdSetDepthBiasEnable(current_cmd, zmode_decal);
+
+    if(zmode_decal) {
+        vkCmdSetDepthBias(current_cmd, -2, 0, -2);
+    }
 }
 
 static void gfx_vulkan_renderer_set_viewport(int x, int y, int width, int height) {