Simplify fill shaders;

Now there's 2 instead of 3!  Behavior is the same, fill goes
layer-by-layer onto each view until either the texture or canvas run out
of layers.

etc/shaders.h

@@ -7,7 +7,6 @@
 #include "shaders/equirect.frag.h"
 #include "shaders/fill.vert.h"
 #include "shaders/fill_array.frag.h"
-#include "shaders/fill_layer.frag.h"
 #include "shaders/animator.comp.h"
 #include "shaders/blender.comp.h"
 #include "shaders/timewizard.comp.h"

etc/shaders/fill_array.frag

@@ -1,11 +1,12 @@
 #version 460
 #extension GL_EXT_multiview : require
 #extension GL_GOOGLE_include_directive : require
+#extension GL_EXT_samplerless_texture_functions : require
 
 #include "lovr.glsl"
 
 layout(set = 1, binding = 1) uniform texture2DArray ArrayTexture;
 
 vec4 lovrmain() {
-  return Color * getPixel(ArrayTexture, UV, ViewIndex);
+  return Color * getPixel(ArrayTexture, UV, min(ViewIndex, textureSize(ArrayTexture, 0).z - 1));
 }

etc/shaders/fill_layer.frag

@@ -1,11 +0,0 @@
-#version 460
-#extension GL_EXT_multiview : require
-#extension GL_GOOGLE_include_directive : require
-
-#include "lovr.glsl"
-
-layout(set = 1, binding = 1) uniform texture2DArray ArrayTexture;
-
-vec4 lovrmain() {
-  return Color * getPixel(ArrayTexture, UV, 0);
-}

src/api/l_graphics.c

@@ -56,9 +56,8 @@ StringEntry lovrDefaultShader[] = {
   [SHADER_FONT] = ENTRY("font"),
   [SHADER_CUBEMAP] = ENTRY("cubemap"),
   [SHADER_EQUIRECT] = ENTRY("equirect"),
-  [SHADER_FILL] = ENTRY("fill"),
+  [SHADER_FILL_2D] = ENTRY("fill2d"),
   [SHADER_FILL_ARRAY] = ENTRY("fillarray"),
-  [SHADER_FILL_LAYER] = ENTRY("filllayer"),
   [SHADER_LOGO] = ENTRY("logo"),
   { 0 }
 };

src/modules/graphics/graphics.c

@@ -1760,7 +1760,7 @@ ShaderSource lovrGraphicsGetDefaultShaderSource(DefaultShader type, ShaderStage
       [STAGE_VERTEX] = { lovr_shader_cubemap_vert, sizeof(lovr_shader_cubemap_vert) },
       [STAGE_FRAGMENT] = { lovr_shader_equirect_frag, sizeof(lovr_shader_equirect_frag) }
     },
-    [SHADER_FILL] = {
+    [SHADER_FILL_2D] = {
       [STAGE_VERTEX] = { lovr_shader_fill_vert, sizeof(lovr_shader_fill_vert) },
       [STAGE_FRAGMENT] = { lovr_shader_unlit_frag, sizeof(lovr_shader_unlit_frag) }
     },
@@ -1768,10 +1768,6 @@ ShaderSource lovrGraphicsGetDefaultShaderSource(DefaultShader type, ShaderStage
       [STAGE_VERTEX] = { lovr_shader_fill_vert, sizeof(lovr_shader_fill_vert) },
       [STAGE_FRAGMENT] = { lovr_shader_fill_array_frag, sizeof(lovr_shader_fill_array_frag) }
     },
-    [SHADER_FILL_LAYER] = {
-      [STAGE_VERTEX] = { lovr_shader_fill_vert, sizeof(lovr_shader_fill_vert) },
-      [STAGE_FRAGMENT] = { lovr_shader_fill_layer_frag, sizeof(lovr_shader_fill_layer_frag) }
-    },
     [SHADER_LOGO] = {
       [STAGE_VERTEX] = { lovr_shader_unlit_vert, sizeof(lovr_shader_unlit_vert) },
       [STAGE_FRAGMENT] = { lovr_shader_logo_frag, sizeof(lovr_shader_logo_frag) }
@@ -5693,22 +5689,9 @@ void lovrPassSkybox(Pass* pass, Texture* texture) {
 }
 
 void lovrPassFill(Pass* pass, Texture* texture) {
-  DefaultShader shader;
-
-  if (!texture || texture->info.layers == 1) {
-    shader = SHADER_FILL;
-  } else if (pass->viewCount > 1 && texture->info.layers > 1) {
-    lovrCheck(texture->info.layers == pass->viewCount, "Texture layer counts must match to fill between them");
-    shader = SHADER_FILL_ARRAY;
-  } else if (pass->viewCount == 1 && texture->info.layers > 1) {
-    shader = SHADER_FILL_LAYER;
-  } else {
-    lovrUnreachable();
-  }
-
   lovrPassDraw(pass, &(Draw) {
     .mode = MESH_TRIANGLES,
-    .shader = shader,
+    .shader = texture && texture->info.type == TEXTURE_ARRAY ? SHADER_FILL_ARRAY : SHADER_FILL_2D,
     .material = texture ? lovrTextureGetMaterial(texture) : NULL,
     .vertex.format = VERTEX_EMPTY,
     .count = 3

src/modules/graphics/graphics.h

@@ -281,9 +281,8 @@ typedef enum {
   SHADER_FONT,
   SHADER_CUBEMAP,
   SHADER_EQUIRECT,
-  SHADER_FILL,
+  SHADER_FILL_2D,
   SHADER_FILL_ARRAY,
-  SHADER_FILL_LAYER,
   SHADER_LOGO,
   SHADER_ANIMATOR,
   SHADER_BLENDER,