From c4aa82e2fa52a807d1b1d90cc194c686c4b3a37b Mon Sep 17 00:00:00 2001
From: junjie020 <junjie020@163.com>
Date: Sat, 29 Dec 2018 17:29:49 +0800
Subject: [PATCH 1/3] fix bump example tangent lighting wrong

---
 examples/06-bump/fs_bump.sc           | 25 ++++++++++++-------
 examples/06-bump/vs_bump.sc           | 35 ++++++++++++++++-----------
 examples/06-bump/vs_bump_instanced.sc | 17 ++++++-------
 3 files changed, 44 insertions(+), 33 deletions(-)

diff --git a/examples/06-bump/fs_bump.sc b/examples/06-bump/fs_bump.sc
index 65154548b..b14028f96 100644
--- a/examples/06-bump/fs_bump.sc
+++ b/examples/06-bump/fs_bump.sc
@@ -1,4 +1,4 @@
-$input v_wpos, v_view, v_normal, v_tangent, v_bitangent, v_texcoord0 // in...
+$input v_wpos, v_view, v_normal, v_tangent, v_bitangent, v_texcoord0// in...
 
 /*
  * Copyright 2011-2018 Branimir Karadzic. All rights reserved.
@@ -15,7 +15,8 @@ uniform vec4 u_lightRgbInnerR[4];
 vec2 blinn(vec3 _lightDir, vec3 _normal, vec3 _viewDir)
 {
 	float ndotl = dot(_normal, _lightDir);
-	vec3 reflected = _lightDir - 2.0*ndotl*_normal; // reflect(_lightDir, _normal);
+	//vec3 reflected = _lightDir - 2.0*ndotl*_normal; // reflect(_lightDir, _normal);
+	vec3 reflected = 2.0*ndotl*_normal - _lightDir;
 	float rdotv = dot(reflected, _viewDir);
 	return vec2(ndotl, rdotv);
 }
@@ -45,25 +46,31 @@ vec3 calcLight(int _idx, mat3 _tbn, vec3 _wpos, vec3 _normal, vec3 _view)
 {
 	vec3 lp = u_lightPosRadius[_idx].xyz - _wpos;
 	float attn = 1.0 - smoothstep(u_lightRgbInnerR[_idx].w, 1.0, length(lp) / u_lightPosRadius[_idx].w);
-	vec3 lightDir = mul(_tbn, normalize(lp) );
+	vec3 lightDir = mul( normalize(lp), _tbn );
 	vec2 bln = blinn(lightDir, _normal, _view);
 	vec4 lc = lit(bln.x, bln.y, 1.0);
 	vec3 rgb = u_lightRgbInnerR[_idx].xyz * saturate(lc.y) * attn;
 	return rgb;
 }
 
+mat3 mtx3FromCols(vec3 c0, vec3 c1, vec3 c2)
+{
+#ifdef BGFX_SHADER_LANGUAGE_GLSL
+	return mat3(c0, c1, c2);
+#else
+	return transpose(mat3(c0, c1, c2));
+#endif
+}
+
+
 void main()
 {
-	mat3 tbn = mat3(
-				normalize(v_tangent),
-				normalize(v_bitangent),
-				normalize(v_normal)
-				);
+	mat3 tbn = mtx3FromCols(v_tangent, v_bitangent, v_normal);
 
 	vec3 normal;
 	normal.xy = texture2D(s_texNormal, v_texcoord0).xy * 2.0 - 1.0;
 	normal.z = sqrt(1.0 - dot(normal.xy, normal.xy) );
-	vec3 view = -normalize(v_view);
+	vec3 view = normalize(v_view);
 
 	vec3 lightColor;
 	lightColor =  calcLight(0, tbn, v_wpos, normal, view);
diff --git a/examples/06-bump/vs_bump.sc b/examples/06-bump/vs_bump.sc
index d41f87fc2..26a4831b2 100644
--- a/examples/06-bump/vs_bump.sc
+++ b/examples/06-bump/vs_bump.sc
@@ -8,30 +8,37 @@ $output v_wpos, v_view, v_normal, v_tangent, v_bitangent, v_texcoord0
 
 #include "../common/common.sh"
 
+mat3 mtx3FromCols(vec3 c0, vec3 c1, vec3 c2)
+{
+#ifdef BGFX_SHADER_LANGUAGE_GLSL
+	return mat3(c0, c1, c2);
+#else
+	return transpose(mat3(c0, c1, c2));
+#endif
+}
+
 void main()
 {
 	vec3 wpos = mul(u_model[0], vec4(a_position, 1.0) ).xyz;
+	v_wpos = wpos;
+
 	gl_Position = mul(u_viewProj, vec4(wpos, 1.0) );
 	
 	vec4 normal = a_normal * 2.0 - 1.0;
-	vec3 wnormal = mul(u_model[0], vec4(normal.xyz, 0.0) ).xyz;
-
 	vec4 tangent = a_tangent * 2.0 - 1.0;
+
+	vec3 wnormal = mul(u_model[0], vec4(normal.xyz, 0.0) ).xyz;
 	vec3 wtangent = mul(u_model[0], vec4(tangent.xyz, 0.0) ).xyz;
 
-	vec3 viewNormal = normalize(mul(u_view, vec4(wnormal, 0.0) ).xyz);
-	vec3 viewTangent = normalize(mul(u_view, vec4(wtangent, 0.0) ).xyz);
-	vec3 viewBitangent = cross(viewNormal, viewTangent) * tangent.w;
-	mat3 tbn = mat3(viewTangent, viewBitangent, viewNormal);
+	v_normal = normalize(wnormal);
+	v_tangent = normalize(wtangent);
+	v_bitangent = cross(v_normal, v_tangent) * tangent.w;
 
-	v_wpos = wpos;
-
-	vec3 view = mul(u_view, vec4(wpos, 0.0) ).xyz;
-	v_view = mul(view, tbn);
-
-	v_normal = viewNormal;
-	v_tangent = viewTangent;
-	v_bitangent = viewBitangent;
+	mat3 tbn = mtx3FromCols(v_tangent, v_bitangent, v_normal);
 
+	// eye position in world space
+	vec3 weyepos = mul(vec4(0.0, 0.0, 0.0, 1.0), u_view).xyz;	
+	// tangent space view dir
+	v_view = mul(weyepos - wpos, tbn);	
 	v_texcoord0 = a_texcoord0;
 }
diff --git a/examples/06-bump/vs_bump_instanced.sc b/examples/06-bump/vs_bump_instanced.sc
index 24c509732..addc850df 100644
--- a/examples/06-bump/vs_bump_instanced.sc
+++ b/examples/06-bump/vs_bump_instanced.sc
@@ -25,19 +25,16 @@ void main()
 	vec4 tangent = a_tangent * 2.0 - 1.0;
 	vec3 wtangent = instMul(model, vec4(tangent.xyz, 0.0) ).xyz;
 
-	vec3 viewNormal = normalize(mul(u_view, vec4(wnormal, 0.0) ).xyz);
-	vec3 viewTangent = normalize(mul(u_view, vec4(wtangent, 0.0) ).xyz);
-	vec3 viewBitangent = cross(viewNormal, viewTangent) * tangent.w;
-	mat3 tbn = mat3(viewTangent, viewBitangent, viewNormal);
+	v_normal = wnormal;
+	v_tangent = wtangent;
+	v_bitangent = cross(v_normal, v_tangent) * tangent.w;
+
+	mat3 tbn = mat3(v_tangent, v_bitangent, v_normal);
 
 	v_wpos = wpos;
 
-	vec3 view = mul(u_view, vec4(wpos, 0.0) ).xyz;
-	v_view = instMul(view, tbn);
-
-	v_normal = viewNormal;
-	v_tangent = viewTangent;
-	v_bitangent = viewBitangent;
+	vec3 weyepos = mul(vec4(0.0, 0.0, 0.0, 1.0), u_view).xyz;		
+	v_view = instMul(weyepos - wpos, tbn);
 
 	v_texcoord0 = a_texcoord0;
 }

From 9a39e66e2ba9ce8cb63317d3f8cc3e453fcebcf7 Mon Sep 17 00:00:00 2001
From: junjie020 <junjie020@163.com>
Date: Sat, 29 Dec 2018 17:58:43 +0800
Subject: [PATCH 2/3] add compile shader

---
 examples/runtime/shaders/dx11/fs_bump.bin     | Bin 3635 -> 3475 bytes
 examples/runtime/shaders/dx11/vs_bump.bin     | Bin 2090 -> 1866 bytes
 .../shaders/dx11/vs_bump_instanced.bin        | Bin 2172 -> 1796 bytes
 examples/runtime/shaders/dx9/fs_bump.bin      | Bin 2268 -> 2268 bytes
 examples/runtime/shaders/dx9/vs_bump.bin      | Bin 1083 -> 967 bytes
 .../runtime/shaders/dx9/vs_bump_instanced.bin | Bin 1077 -> 937 bytes
 examples/runtime/shaders/essl/fs_bump.bin     | Bin 4783 -> 4751 bytes
 examples/runtime/shaders/essl/vs_bump.bin     | Bin 1743 -> 1474 bytes
 .../shaders/essl/vs_bump_instanced.bin        | Bin 1936 -> 1801 bytes
 examples/runtime/shaders/glsl/fs_bump.bin     | Bin 4465 -> 4433 bytes
 examples/runtime/shaders/glsl/vs_bump.bin     | Bin 1593 -> 1348 bytes
 .../shaders/glsl/vs_bump_instanced.bin        | Bin 1756 -> 1627 bytes
 examples/runtime/shaders/metal/fs_bump.bin    | Bin 5288 -> 5291 bytes
 examples/runtime/shaders/metal/vs_bump.bin    | Bin 2130 -> 1856 bytes
 .../shaders/metal/vs_bump_instanced.bin       | Bin 2350 -> 2111 bytes
 15 files changed, 0 insertions(+), 0 deletions(-)

diff --git a/examples/runtime/shaders/dx11/fs_bump.bin b/examples/runtime/shaders/dx11/fs_bump.bin
index c6f5a6f8318d0e6f416debba73094e0f091fd10a..5a9df80533a0501f36b2a60f0066ee71f583b5ce 100644
GIT binary patch
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diff --git a/examples/runtime/shaders/dx11/vs_bump.bin b/examples/runtime/shaders/dx11/vs_bump.bin
index 8f0f9a6b85821355dca49792e29680390ab0983d..0db2911f3397ca33effc4ba373964aaf2e880625 100644
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diff --git a/examples/runtime/shaders/dx11/vs_bump_instanced.bin b/examples/runtime/shaders/dx11/vs_bump_instanced.bin
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diff --git a/examples/runtime/shaders/dx9/fs_bump.bin b/examples/runtime/shaders/dx9/fs_bump.bin
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GIT binary patch
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diff --git a/examples/runtime/shaders/dx9/vs_bump.bin b/examples/runtime/shaders/dx9/vs_bump.bin
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diff --git a/examples/runtime/shaders/dx9/vs_bump_instanced.bin b/examples/runtime/shaders/dx9/vs_bump_instanced.bin
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diff --git a/examples/runtime/shaders/essl/fs_bump.bin b/examples/runtime/shaders/essl/fs_bump.bin
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diff --git a/examples/runtime/shaders/essl/vs_bump.bin b/examples/runtime/shaders/essl/vs_bump.bin
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diff --git a/examples/runtime/shaders/essl/vs_bump_instanced.bin b/examples/runtime/shaders/essl/vs_bump_instanced.bin
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diff --git a/examples/runtime/shaders/glsl/fs_bump.bin b/examples/runtime/shaders/glsl/fs_bump.bin
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diff --git a/examples/runtime/shaders/glsl/vs_bump.bin b/examples/runtime/shaders/glsl/vs_bump.bin
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diff --git a/examples/runtime/shaders/glsl/vs_bump_instanced.bin b/examples/runtime/shaders/glsl/vs_bump_instanced.bin
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diff --git a/examples/runtime/shaders/metal/fs_bump.bin b/examples/runtime/shaders/metal/fs_bump.bin
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diff --git a/examples/runtime/shaders/metal/vs_bump.bin b/examples/runtime/shaders/metal/vs_bump.bin
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diff --git a/examples/runtime/shaders/metal/vs_bump_instanced.bin b/examples/runtime/shaders/metal/vs_bump_instanced.bin
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From 75d1ffedad45e1463f666bfee1ac8511c7b951a2 Mon Sep 17 00:00:00 2001
From: junjie020 <junjie020@163.com>
Date: Sat, 29 Dec 2018 17:58:53 +0800
Subject: [PATCH 3/3] fix shader mk

---
 scripts/shader.mk | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/scripts/shader.mk b/scripts/shader.mk
index e8ca61d33..df8bfede1 100644
--- a/scripts/shader.mk
+++ b/scripts/shader.mk
@@ -121,17 +121,20 @@ BIN += $(CS_BIN)
 ASM += $(CS_ASM)
 endif
 
-$(BUILD_INTERMEDIATE_DIR)/vs_%.bin : $(SHADERS_DIR)vs_%.sc
+$(BUILD_INTERMEDIATE_DIR):
+	mkdir -p $@
+
+$(BUILD_INTERMEDIATE_DIR)/vs_%.bin : $(SHADERS_DIR)vs_%.sc	| $(BUILD_INTERMEDIATE_DIR)
 	@echo [$(<)]
 	$(SILENT) $(SHADERC) $(VS_FLAGS) --type vertex --depends -o $(@) -f $(<) --disasm
 	$(SILENT) cp $(@) $(BUILD_OUTPUT_DIR)/$(@F)
 
-$(BUILD_INTERMEDIATE_DIR)/fs_%.bin : $(SHADERS_DIR)fs_%.sc
+$(BUILD_INTERMEDIATE_DIR)/fs_%.bin : $(SHADERS_DIR)fs_%.sc | $(BUILD_INTERMEDIATE_DIR)
 	@echo [$(<)]
 	$(SILENT) $(SHADERC) $(FS_FLAGS) --type fragment --depends -o $(@) -f $(<) --disasm
 	$(SILENT) cp $(@) $(BUILD_OUTPUT_DIR)/$(@F)
 
-$(BUILD_INTERMEDIATE_DIR)/cs_%.bin : $(SHADERS_DIR)cs_%.sc
+$(BUILD_INTERMEDIATE_DIR)/cs_%.bin : $(SHADERS_DIR)cs_%.sc | $(BUILD_INTERMEDIATE_DIR)
 	@echo [$(<)]
 	$(SILENT) $(SHADERC) $(CS_FLAGS) --type compute --depends -o $(@) -f $(<) --disasm
 	$(SILENT) cp $(@) $(BUILD_OUTPUT_DIR)/$(@F)