UPBGE: Fix discard at edge option according to scale

fixes issue: #575

source/blender/gpu/intern/gpu_material.c

@@ -1376,6 +1376,7 @@ static void do_material_tex(GPUShadeInput *shi)
 					 GPU_image(tex->ima, &tex->iuser, false),
 					 GPU_select_uniform(&mtex->parallaxsteps, GPU_DYNAMIC_TEX_PARALLAXSTEP, NULL, ma),
 					 GPU_select_uniform(&mtex->parallaxbumpsc, GPU_DYNAMIC_TEX_PARALLAXBUMP, NULL, ma),
+					 GPU_select_uniform(mtex->size, GPU_DYNAMIC_TEX_UVSIZE, NULL, ma),
 					 GPU_uniform(&discard),
 					 GPU_uniform(&comp),
 					 &parco);

source/blender/gpu/shaders/gpu_shader_material.glsl

@@ -4097,7 +4097,7 @@ void node_output_world(vec4 surface, vec4 volume, out vec4 result)
 }
 
 void mtex_parallax(vec3 texco, vec3 vp, vec4 tangent, vec3 vn, sampler2D ima, float numsteps,
-				  float bumpscale, float discarduv, float comp, out vec3 ptexcoord)
+				  float bumpscale, vec3 scale, float discarduv, float comp, out vec3 ptexcoord)
 {
 	// Compute binormal/bitangent from tangent and normal.
 	vec3 binormal = cross(-vn, tangent.xyz) * tangent.w;
@@ -4158,8 +4158,8 @@ void mtex_parallax(vec3 texco, vec3 vp, vec4 tangent, vec3 vn, sampler2D ima, fl
 	vec2 finaltexuv = mix(texuv, texuvprelay, weight);
 
 	// Discard if uv is out of the range 0 to 1.
-	const vec2 clampmin = vec2(-0.5);
-	const vec2 clampmax = vec2(0.5);
+	vec2 clampmin = vec2(-0.5) * scale.xy;
+	vec2 clampmax = vec2(0.5) * scale.xy;
 
 	if ((discarduv == 1.0) &&
 		(finaltexuv.x - 0.5 < clampmin.x || finaltexuv.x - 0.5 > clampmax.x ||

source/blender/nodes/shader/nodes/node_shader_parallax.c

@@ -49,6 +49,7 @@ static int gpu_shader_parallax(GPUMaterial *mat, bNode *node, bNodeExecData *UNU
 		GPUNodeLink *texco;
 		GPUNodeLink *norm;
 		GPUNodeLink *outuv;
+		float one[3] = { 1.0f, 1.0f, 1.0f };
 
 		for (unsigned short i = 0; i < 3; ++i) {
 			if (!in[i].link) {
@@ -62,7 +63,7 @@ static int gpu_shader_parallax(GPUMaterial *mat, bNode *node, bNodeExecData *UNU
 		float comp = (float) node->custom1;
 		float discard = (float) node->custom2;
 		GPU_link(mat, "mtex_parallax", texco, GPU_builtin(GPU_VIEW_POSITION), GPU_attribute(CD_TANGENT, ""), norm, texlink,
-			in[1].link, in[2].link, GPU_uniform(&discard), GPU_uniform(&comp), &outuv);
+			in[1].link, in[2].link, GPU_uniform(one), GPU_uniform(&discard), GPU_uniform(&comp), &outuv);
 
 		GPU_link(mat, "parallax_uv_attribute", outuv, &out[0].link);