From: Corbin Simpson <MostAwesomeDude@gmail.com>
Date: Mon, 16 Jun 2008 18:37:32 +0000 (-0700)
Subject: r300: Make LOD bias a persistent environment variable.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=27b7f896d4492021f8b8c35a69c28f5854ab1f90;p=mesa.git

r300: Make LOD bias a persistent environment variable.
Per airlied's suggestion.
---

diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index a86e4bc3444..55d3d55e900 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -1381,6 +1381,18 @@ static void r500SetupFragmentShaderTextures(GLcontext *ctx, int *tmu_mappings)
 	}
 }
 
+static GLuint r300CalculateTexLodBias(GLfloat bias)
+{
+	GLuint b;
+	b = (unsigned int)fabsf(ceilf(bias*31));
+	if (signbit(bias)) {
+		b ^= 0x3ff; /* 10 bits */
+	}
+	b <<= 3;
+	b &= R300_LOD_BIAS_MASK;
+	return b;
+}
+
 static void r300SetupTextures(GLcontext * ctx)
 {
 	int i, mtu;
@@ -1444,7 +1456,8 @@ static void r300SetupTextures(GLcontext * ctx)
 			r300->hw.tex.filter.cmd[R300_TEX_VALUE_0 +
 						hw_tmu] =
 			    gen_fixed_filter(t->filter) | (hw_tmu << 28);
-			r300->hw.tex.filter_1.cmd[R300_TEX_VALUE_0 + hw_tmu] = t->filter_1;
+			r300->hw.tex.filter_1.cmd[R300_TEX_VALUE_0 + hw_tmu] = t->filter_1
+				| r300CalculateTexLodBias(r300->LODBias);
 			r300->hw.tex.size.cmd[R300_TEX_VALUE_0 + hw_tmu] =
 			    t->size;
 			r300->hw.tex.format.cmd[R300_TEX_VALUE_0 +
diff --git a/src/mesa/drivers/dri/r300/r300_tex.c b/src/mesa/drivers/dri/r300/r300_tex.c
index a3d6f90ef6a..5f54bcad9a3 100644
--- a/src/mesa/drivers/dri/r300/r300_tex.c
+++ b/src/mesa/drivers/dri/r300/r300_tex.c
@@ -284,7 +284,6 @@ static r300TexObjPtr r300AllocTexObj(struct gl_texture_object *texObj)
 		r300SetTexWrap(t, texObj->WrapS, texObj->WrapT, texObj->WrapR);
 		r300SetTexFilter(t, texObj->MinFilter, texObj->MagFilter, texObj->MaxAnisotropy);
 		r300SetTexBorderColor(t, texObj->_BorderChan);
-		r300SetTexLodBias(t, texObj->LodBias);
 	}
 
 	return t;
@@ -1036,18 +1035,6 @@ static void r300TexEnv(GLcontext * ctx, GLenum target,
 			"no_neg_lod_bias") ? 0.0 : -16.0;
 		bias = CLAMP(bias, min, 16.0);
 
-		/* This next part feels quite hackish;
-		 * is there a cleaner way? */
-		GLenum target = r300TexUnitTarget(&ctx->Texture.Unit[ctx->Texture.CurrentUnit]);
-		if (target) {
-			struct gl_texture_object *texObj =
-				_mesa_select_tex_object(ctx, &ctx->Texture.Unit[ctx->Texture.CurrentUnit], target);
-			r300TexObjPtr t = (r300TexObjPtr) texObj->DriverData;
-			texObj->LodBias = bias;
-
-			r300SetTexLodBias(t, texObj->LodBias);
-		}
-
 		rmesa->LODBias = bias;
 
 		break;