From 75e61e5a6dc70107eaf784a369f225ca062fdcd5 Mon Sep 17 00:00:00 2001
From: Jeroen Bakker <jeroen@blender.org>
Date: Fri, 28 Jan 2022 15:00:26 +0100
Subject: Image Engine: Use GPUShaderCreateInfo.

Ported the image engine shaders to use the GPUShaderCreateInfo struct.
No functional changes.
---
 .../engines/image/shaders/image_engine_frag.glsl   | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 source/blender/draw/engines/image/shaders/image_engine_frag.glsl

(limited to 'source/blender/draw/engines/image/shaders/image_engine_frag.glsl')

diff --git a/source/blender/draw/engines/image/shaders/image_engine_frag.glsl b/source/blender/draw/engines/image/shaders/image_engine_frag.glsl
new file mode 100644
index 00000000000..bcdc8445b26
--- /dev/null
+++ b/source/blender/draw/engines/image/shaders/image_engine_frag.glsl
@@ -0,0 +1,45 @@
+#pragma BLENDER_REQUIRE(common_colormanagement_lib.glsl)
+
+/* Keep in sync with image_engine.c */
+#define IMAGE_DRAW_FLAG_SHOW_ALPHA (1 << 0)
+#define IMAGE_DRAW_FLAG_APPLY_ALPHA (1 << 1)
+#define IMAGE_DRAW_FLAG_SHUFFLING (1 << 2)
+#define IMAGE_DRAW_FLAG_DEPTH (1 << 3)
+
+#define Z_DEPTH_BORDER 1.0
+#define Z_DEPTH_IMAGE 0.75
+
+#define FAR_DISTANCE farNearDistances.x
+#define NEAR_DISTANCE farNearDistances.y
+
+bool is_border(vec2 uv)
+{
+  return (uv.x < 0.0 || uv.y < 0.0 || uv.x > maxUv.x || uv.y > maxUv.y);
+}
+
+void main()
+{
+  ivec2 uvs_clamped = ivec2(uv_screen);
+  vec4 tex_color = texelFetch(imageTexture, uvs_clamped, 0);
+
+  bool border = is_border(uv_image);
+  if (!border) {
+    if ((drawFlags & IMAGE_DRAW_FLAG_APPLY_ALPHA) != 0) {
+      if (!imgPremultiplied) {
+        tex_color.rgb *= tex_color.a;
+      }
+    }
+    if ((drawFlags & IMAGE_DRAW_FLAG_DEPTH) != 0) {
+      tex_color = smoothstep(FAR_DISTANCE, NEAR_DISTANCE, tex_color);
+    }
+
+    if ((drawFlags & IMAGE_DRAW_FLAG_SHUFFLING) != 0) {
+      tex_color = col * dot(tex_color, shuffle);
+    }
+    if ((drawFlags & IMAGE_DRAW_FLAG_SHOW_ALPHA) == 0) {
+      tex_color.a = 1.0;
+    }
+  }
+  fragColor = tex_color;
+  gl_FragDepth = border ? Z_DEPTH_BORDER : Z_DEPTH_IMAGE;
+}
-- 
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