Workbench Simplification Refactor

This patch is (almost) a complete rewrite of workbench engine.
The features remain unchanged but the code quality is greatly improved.
Hair shading is brighter but also more correct.

This also introduce the concept of `DRWShaderLibrary` to make a simple
include system inside the GLSL files.

Differential Revision: https://developer.blender.org/D7060

1 files changed, 0 insertions, 118 deletions

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_forward_transparent_accum_frag.glsl b/source/blender/draw/engines/workbench/shaders/workbench_forward_transparent_accum_frag.glsl
deleted file mode 100644
index 559dc07c107..00000000000
--- a/source/blender/draw/engines/workbench/shaders/workbench_forward_transparent_accum_frag.glsl
+++ /dev/null
@@ -1,118 +0,0 @@
-
-uniform float ImageTransparencyCutoff = 0.1;
-#ifdef TEXTURE_IMAGE_ARRAY
-uniform sampler2DArray image_tile_array;
-uniform sampler1DArray image_tile_data;
-#else
-uniform sampler2D image;
-#endif
-uniform bool imageNearest;
-uniform bool imagePremultiplied;
-
-uniform float alpha = 0.5;
-uniform vec2 invertedViewportSize;
-uniform vec4 viewvecs[3];
-
-uniform vec4 materialColorAndMetal;
-uniform float materialRoughness;
-
-uniform float shadowMultiplier = 0.5;
-uniform float lightMultiplier = 1.0;
-uniform float shadowShift = 0.1;
-uniform float shadowFocus = 1.0;
-
-#ifdef NORMAL_VIEWPORT_PASS_ENABLED
-in vec3 normal_viewport;
-#endif /* NORMAL_VIEWPORT_PASS_ENABLED */
-#ifdef V3D_SHADING_TEXTURE_COLOR
-in vec2 uv_interp;
-#endif
-#ifdef V3D_SHADING_VERTEX_COLOR
-in vec3 vertexColor;
-#endif
-#ifdef V3D_LIGHTING_MATCAP
-uniform sampler2D matcapDiffuseImage;
-uniform sampler2D matcapSpecularImage;
-#endif
-
-layout(std140) uniform world_block
-{
-  WorldData world_data;
-};
-
-layout(location = 0) out vec4 transparentAccum;
-layout(location = 1) out
-    float revealageAccum; /* revealage actually stored in transparentAccum.a */
-
-void main()
-{
-  vec4 base_color;
-
-#if defined(V3D_SHADING_TEXTURE_COLOR)
-#  ifdef TEXTURE_IMAGE_ARRAY
-  base_color = workbench_sample_texture_array(
-      image_tile_array, image_tile_data, uv_interp, imageNearest, imagePremultiplied);
-#  else
-  base_color = workbench_sample_texture(image, uv_interp, imageNearest, imagePremultiplied);
-#  endif
-  if (base_color.a < ImageTransparencyCutoff) {
-    discard;
-  }
-#elif defined(V3D_SHADING_VERTEX_COLOR)
-  base_color.rgb = vertexColor;
-#else
-  base_color.rgb = materialColorAndMetal.rgb;
-#endif /* V3D_SHADING_TEXTURE_COLOR */
-
-  vec2 uv_viewport = gl_FragCoord.xy * invertedViewportSize;
-  vec3 I_vs = view_vector_from_screen_uv(uv_viewport, viewvecs, ProjectionMatrix);
-
-#ifdef NORMAL_VIEWPORT_PASS_ENABLED
-  vec3 nor = normalize(normal_viewport);
-#endif
-
-  /* -------- SHADING --------- */
-#ifdef V3D_LIGHTING_FLAT
-  vec3 shaded_color = base_color.rgb;
-
-#elif defined(V3D_LIGHTING_MATCAP)
-  bool flipped = world_data.matcap_orientation != 0;
-  vec2 matcap_uv = matcap_uv_compute(I_vs, nor, flipped);
-  vec3 matcap_diffuse = textureLod(matcapDiffuseImage, matcap_uv, 0.0).rgb;
-#  ifdef V3D_SHADING_SPECULAR_HIGHLIGHT
-  vec3 matcap_specular = textureLod(matcapSpecularImage, matcap_uv, 0.0).rgb;
-#  else
-  vec3 matcap_specular = vec3(0.0);
-#  endif
-  vec3 shaded_color = matcap_diffuse * base_color.rgb + matcap_specular;
-
-#elif defined(V3D_LIGHTING_STUDIO)
-#  ifdef V3D_SHADING_SPECULAR_HIGHLIGHT
-  float metallic = materialColorAndMetal.a;
-  vec3 specular_color = mix(vec3(0.05), base_color.rgb, metallic);
-  vec3 diffuse_color = mix(base_color.rgb, vec3(0.0), metallic);
-#  else
-  vec3 specular_color = vec3(0.0);
-  vec3 diffuse_color = base_color.rgb;
-#  endif
-
-  vec3 shaded_color = get_world_lighting(
-      world_data, diffuse_color, specular_color, materialRoughness, nor, I_vs);
-#endif
-
-#ifdef V3D_SHADING_SHADOW
-  float light_factor = -dot(nor, world_data.shadow_direction_vs.xyz);
-  float shadow_mix = smoothstep(shadowFocus, shadowShift, light_factor);
-  shaded_color *= mix(lightMultiplier, shadowMultiplier, shadow_mix);
-#endif
-
-  /* Based on :
-   * McGuire and Bavoil, Weighted Blended Order-Independent Transparency, Journal of
-   * Computer Graphics Techniques (JCGT), vol. 2, no. 2, 122–141, 2013
-   */
-  /* Listing 4 */
-  float z = linear_zdepth(gl_FragCoord.z, viewvecs, ProjectionMatrix);
-  float weight = calculate_transparent_weight(z, alpha);
-  transparentAccum = vec4(shaded_color * weight, alpha);
-  revealageAccum = weight;
-}