D13910: Workbench: Port shaders to use GPUShaderCreateInfo

Also adds a few things to GPUShader for easily create shaders.
Heavy usage of macros to compose the createInfo and avoid
duplications and copy paste bugs.
This makes the link between the shader request functions
(in workbench_shader.cc) and the actual createInfo a bit
obscure since the names are composed and not searchable.

Reviewed By: jbakker
Differential Revision: https://developer.blender.org/D13910

1 files changed, 33 insertions, 0 deletions

diff --git a/source/blender/draw/intern/shaders/common_view_clipping_lib.glsl b/source/blender/draw/intern/shaders/common_view_clipping_lib.glsl
new file mode 100644
index 00000000000..d55808c42d2
--- /dev/null
+++ b/source/blender/draw/intern/shaders/common_view_clipping_lib.glsl
@@ -0,0 +1,33 @@
+
+#pragma BLENDER_REQUIRE(common_view_lib.glsl)
+
+#if defined(GPU_VERTEX_SHADER) || defined(GPU_GEOMETRY_SHADER)
+
+void view_clipping_distances(vec3 wpos)
+{
+#  ifdef USE_WORLD_CLIP_PLANES
+  vec4 pos = vec4(wpos, 1.0);
+  gl_ClipDistance[0] = dot(drw_view.clip_planes[0], pos);
+  gl_ClipDistance[1] = dot(drw_view.clip_planes[1], pos);
+  gl_ClipDistance[2] = dot(drw_view.clip_planes[2], pos);
+  gl_ClipDistance[3] = dot(drw_view.clip_planes[3], pos);
+  gl_ClipDistance[4] = dot(drw_view.clip_planes[4], pos);
+  gl_ClipDistance[5] = dot(drw_view.clip_planes[5], pos);
+#  endif
+}
+
+/* Kept as define for compiler compatibility. */
+#  ifdef USE_WORLD_CLIP_PLANES
+#    define view_clipping_distances_set(c) \
+      gl_ClipDistance[0] = (c).gl_ClipDistance[0]; \
+      gl_ClipDistance[1] = (c).gl_ClipDistance[1]; \
+      gl_ClipDistance[2] = (c).gl_ClipDistance[2]; \
+      gl_ClipDistance[3] = (c).gl_ClipDistance[3]; \
+      gl_ClipDistance[4] = (c).gl_ClipDistance[4]; \
+      gl_ClipDistance[5] = (c).gl_ClipDistance[5];
+
+#  else
+#    define view_clipping_distances_set(c)
+#  endif
+
+#endif