glsl and render support for derivative maps

3 files changed, 56 insertions, 9 deletions

diff --git a/source/blender/gpu/intern/gpu_material.c b/source/blender/gpu/intern/gpu_material.c
index 274884000db..28624e9350c 100644
--- a/source/blender/gpu/intern/gpu_material.c
+++ b/source/blender/gpu/intern/gpu_material.c
@@ -906,6 +906,7 @@ static void do_material_tex(GPUShadeInput *shi)
 	int init_done = 0, iBumpSpacePrev;
 	GPUNodeLink *vNorg, *vNacc, *fPrevMagnitude;
 	int iFirstTimeNMap=1;
+	int found_deriv_map = 0;
 
 	GPU_link(mat, "set_value", GPU_uniform(&one), &stencil);
 
@@ -1043,6 +1044,8 @@ static void do_material_tex(GPUShadeInput *shi)
 
 			if(!(mat->scene->gm.flag & GAME_GLSL_NO_EXTRA_TEX) && (mtex->mapto & MAP_NORM)) {
 				if(tex->type==TEX_IMAGE) {
+					found_deriv_map = tex->imaflag & TEX_DERIVATIVEMAP;
+
 					if(tex->imaflag & TEX_NORMALMAP) {
 						/* normalmap image */
 						GPU_link(mat, "mtex_normal", texco, GPU_image(tex->ima, &tex->iuser), &tnor );
@@ -1082,9 +1085,10 @@ static void do_material_tex(GPUShadeInput *shi)
 							GPU_link(mat, "mtex_blend_normal", tnorfac, shi->vn, newnor, &shi->vn);
 						}
 						
-					} else if( mtex->texflag & (MTEX_3TAP_BUMP|MTEX_5TAP_BUMP)) {
+					} else if( (mtex->texflag & (MTEX_3TAP_BUMP|MTEX_5TAP_BUMP)) || found_deriv_map) {
 						/* ntap bumpmap image */
 						int iBumpSpace;
+						float ima_x, ima_y;
 						float hScale = 0.1f; // compatibility adjustment factor for all bumpspace types
 						float hScaleTex = 13.0f; // factor for scaling texspace bumps
 						
@@ -1142,9 +1146,24 @@ static void do_material_tex(GPUShadeInput *shi)
 							
 							iBumpSpacePrev = iBumpSpace;
 						}
+
+						// resolve texture resolution
+						if( (mtex->texflag & MTEX_BUMP_TEXTURESPACE) || found_deriv_map ) {
+							ImBuf *ibuf= BKE_image_get_ibuf(tex->ima, &tex->iuser);
+							ima_x= 512.0f; ima_y= 512.f;		// prevent calling textureSize, glsl 1.3 only
+							if(ibuf) {
+								ima_x= ibuf->x;
+								ima_y= ibuf->y;
+							}
+						}
 						
 						
-						if( mtex->texflag & MTEX_3TAP_BUMP )
+						if(found_deriv_map) {
+							GPU_link( mat, "mtex_bump_deriv", 
+							          texco, GPU_image(tex->ima, &tex->iuser), GPU_uniform(&ima_x), GPU_uniform(&ima_y), tnorfac,
+							          &dBs, &dBt );
+						}
+						else if( mtex->texflag & MTEX_3TAP_BUMP )
 							GPU_link( mat, "mtex_bump_tap3", 
 							          texco, GPU_image(tex->ima, &tex->iuser), tnorfac,
 							          &dBs, &dBt );
@@ -1155,12 +1174,6 @@ static void do_material_tex(GPUShadeInput *shi)
 						
 						
 						if( mtex->texflag & MTEX_BUMP_TEXTURESPACE ) {
-							float ima_x= 512.0f, ima_y= 512.f;		// prevent calling textureSize, glsl 1.3 only
-							ImBuf *ibuf= BKE_image_get_ibuf(tex->ima, &tex->iuser);
-							if(ibuf) {
-								ima_x= ibuf->x;
-								ima_y= ibuf->y;
-							}
 							
 							GPU_link( mat, "mtex_bump_apply_texspace",
 							          fDet, dBs, dBt, vR1, vR2, 
diff --git a/source/blender/gpu/intern/gpu_shader_material.glsl b/source/blender/gpu/intern/gpu_shader_material.glsl
index feb0a84fa87..0aae6d84a01 100644
--- a/source/blender/gpu/intern/gpu_shader_material.glsl
+++ b/source/blender/gpu/intern/gpu_shader_material.glsl
@@ -1226,6 +1226,22 @@ void mtex_bump_tap5( vec3 texco, sampler2D ima, float hScale,
 	dBt = hScale * (Hu - Hd);
 }
 
+void mtex_bump_deriv( vec3 texco, sampler2D ima, float ima_x, float ima_y, float hScale, 
+                     out float dBs, out float dBt ) 
+{
+	float s = 1;		// negate this if flipped texture coordinate
+	vec2 TexDx = dFdx(texco.xy);
+	vec2 TexDy = dFdy(texco.xy);
+	
+	// this variant using a derivative map is described here
+	// http://mmikkelsen3d.blogspot.com/2011/07/derivative-maps.html
+	vec2 dim = vec2(ima_x, ima_y);
+	vec2 dBduv = hScale*dim*(2*texture2D(ima, texco.xy).xy-1);
+	
+	dBs = dBduv.x*TexDx.x + s*dBduv.y*TexDx.y;
+	dBt = dBduv.x*TexDy.x + s*dBduv.y*TexDy.y;
+}
+
 void mtex_bump_apply( float fDet, float dBs, float dBt, vec3 vR1, vec3 vR2, vec3 vNacc_in,
 					  out vec3 vNacc_out, out vec3 perturbed_norm ) 
 {
diff --git a/source/blender/gpu/intern/gpu_shader_material.glsl.c b/source/blender/gpu/intern/gpu_shader_material.glsl.c
index b60f7f1555e..8b23e2b205d 100644
--- a/source/blender/gpu/intern/gpu_shader_material.glsl.c
+++ b/source/blender/gpu/intern/gpu_shader_material.glsl.c
@@ -1,6 +1,6 @@
 /* DataToC output of file <gpu_shader_material_glsl> */
 
-int datatoc_gpu_shader_material_glsl_size= 39207;
+int datatoc_gpu_shader_material_glsl_size= 39783;
 char datatoc_gpu_shader_material_glsl[]= {
  10,102,108,111, 97,116, 32,
 101,120,112, 95, 98,108,101,110,100,101,114, 40,102,108,111, 97,116, 32,102, 41, 10,123, 10,  9,114,101,116,117,114,110, 32,112,
@@ -838,6 +838,24 @@ char datatoc_gpu_shader_material_glsl[]= {
 119, 40, 32,116,101,120,116,117,114,101, 50, 68, 40,105,109, 97, 44, 32, 83, 84,117, 41, 44, 32, 72,117, 32, 41, 59, 10,  9, 10,
   9,100, 66,115, 32, 61, 32,104, 83, 99, 97,108,101, 32, 42, 32, 40, 72,114, 32, 45, 32, 72,108, 41, 59, 10,  9,100, 66,116, 32,
  61, 32,104, 83, 99, 97,108,101, 32, 42, 32, 40, 72,117, 32, 45, 32, 72,100, 41, 59, 10,125, 10, 10,118,111,105,100, 32,109,116,
+101,120, 95, 98,117,109,112, 95,100,101,114,105,118, 40, 32,118,101, 99, 51, 32,116,101,120, 99,111, 44, 32,115, 97,109,112,108,
+101,114, 50, 68, 32,105,109, 97, 44, 32,102,108,111, 97,116, 32,105,109, 97, 95,120, 44, 32,102,108,111, 97,116, 32,105,109, 97,
+ 95,121, 44, 32,102,108,111, 97,116, 32,104, 83, 99, 97,108,101, 44, 32, 10, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
+ 32, 32, 32, 32, 32, 32, 32, 32,111,117,116, 32,102,108,111, 97,116, 32,100, 66,115, 44, 32,111,117,116, 32,102,108,111, 97,116,
+ 32,100, 66,116, 32, 41, 32, 10,123, 10,  9,102,108,111, 97,116, 32,115, 32, 61, 32, 49, 59,  9,  9, 47, 47, 32,110,101,103, 97,
+116,101, 32,116,104,105,115, 32,105,102, 32,102,108,105,112,112,101,100, 32,116,101,120,116,117,114,101, 32, 99,111,111,114,100,
+105,110, 97,116,101, 10,  9,118,101, 99, 50, 32, 84,101,120, 68,120, 32, 61, 32,100, 70,100,120, 40,116,101,120, 99,111, 46,120,
+121, 41, 59, 10,  9,118,101, 99, 50, 32, 84,101,120, 68,121, 32, 61, 32,100, 70,100,121, 40,116,101,120, 99,111, 46,120,121, 41,
+ 59, 10,  9, 10,  9, 47, 47, 32,116,104,105,115, 32,118, 97,114,105, 97,110,116, 32,117,115,105,110,103, 32, 97, 32,100,101,114,
+105,118, 97,116,105,118,101, 32,109, 97,112, 32,105,115, 32,100,101,115, 99,114,105, 98,101,100, 32,104,101,114,101, 10,  9, 47,
+ 47, 32,104,116,116,112, 58, 47, 47,109,109,105,107,107,101,108,115,101,110, 51,100, 46, 98,108,111,103,115,112,111,116, 46, 99,
+111,109, 47, 50, 48, 49, 49, 47, 48, 55, 47,100,101,114,105,118, 97,116,105,118,101, 45,109, 97,112,115, 46,104,116,109,108, 10,
+  9,118,101, 99, 50, 32,100,105,109, 32, 61, 32,118,101, 99, 50, 40,105,109, 97, 95,120, 44, 32,105,109, 97, 95,121, 41, 59, 10,
+  9,118,101, 99, 50, 32,100, 66,100,117,118, 32, 61, 32,104, 83, 99, 97,108,101, 42,100,105,109, 42, 40, 50, 42,116,101,120,116,
+117,114,101, 50, 68, 40,105,109, 97, 44, 32,116,101,120, 99,111, 46,120,121, 41, 46,120,121, 45, 49, 41, 59, 10,  9, 10,  9,100,
+ 66,115, 32, 61, 32,100, 66,100,117,118, 46,120, 42, 84,101,120, 68,120, 46,120, 32, 43, 32,115, 42,100, 66,100,117,118, 46,121,
+ 42, 84,101,120, 68,120, 46,121, 59, 10,  9,100, 66,116, 32, 61, 32,100, 66,100,117,118, 46,120, 42, 84,101,120, 68,121, 46,120,
+ 32, 43, 32,115, 42,100, 66,100,117,118, 46,121, 42, 84,101,120, 68,121, 46,121, 59, 10,125, 10, 10,118,111,105,100, 32,109,116,
 101,120, 95, 98,117,109,112, 95, 97,112,112,108,121, 40, 32,102,108,111, 97,116, 32,102, 68,101,116, 44, 32,102,108,111, 97,116,
  32,100, 66,115, 44, 32,102,108,111, 97,116, 32,100, 66,116, 44, 32,118,101, 99, 51, 32,118, 82, 49, 44, 32,118,101, 99, 51, 32,
 118, 82, 50, 44, 32,118,101, 99, 51, 32,118, 78, 97, 99, 99, 95,105,110, 44, 10,  9,  9,  9,  9,  9, 32, 32,111,117,116, 32,118,