From 776580a6afff9c6403140737ea50f36e9323528a Mon Sep 17 00:00:00 2001
From: Corbin Simpson <MostAwesomeDude@gmail.com>
Date: Sun, 15 Jun 2008 23:54:32 -0700
Subject: [PATCH] r300: Enable LOD bias state emission. Properly set
 t->filter_1 for r300_state to emit. Expect buggies as people see LOD bias
 enabled for the first time...

---
 src/mesa/drivers/dri/r300/r300_tex.c | 65 +++++++++++++++++++++++++++---------
 1 file changed, 49 insertions(+), 16 deletions(-)

diff --git a/src/mesa/drivers/dri/r300/r300_tex.c b/src/mesa/drivers/dri/r300/r300_tex.c
index 317b961..85a6628 100644
--- a/src/mesa/drivers/dri/r300/r300_tex.c
+++ b/src/mesa/drivers/dri/r300/r300_tex.c
@@ -185,7 +185,6 @@ static GLuint aniso_filter(GLfloat anisotropy)
  */
 static void r300SetTexFilter(r300TexObjPtr t, GLenum minf, GLenum magf, GLfloat anisotropy)
 {
-	fprintf(stderr, "Here I am!\n");
 	t->filter &= ~(R300_TX_MIN_FILTER_MASK | R300_TX_MIN_FILTER_MIP_MASK | R300_TX_MAG_FILTER_MASK | R300_TX_MAX_ANISO_MASK);
 	t->filter_1 &= ~R300_EDGE_ANISO_EDGE_ONLY;
 
@@ -243,6 +242,19 @@ static void r300SetTexBorderColor(r300TexObjPtr t, GLubyte c[4])
 	t->pp_border_color = PACK_COLOR_8888(c[3], c[0], c[1], c[2]);
 }
 
+static void r300SetTexLodBias(r300TexObjPtr t, 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;
+
+	t->filter_1 |= b;
+}
+
 /**
  * Allocate space for and load the mesa images into the texture memory block.
  * This will happen before drawing with a new texture, or drawing with a
@@ -271,6 +283,7 @@ 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;
@@ -966,6 +979,33 @@ r300TexSubImage3D(GLcontext * ctx, GLenum target, GLint level,
 	t->dirty_images[0] |= (1 << level);
 }
 
+/* This feels like a prime target for code reuse, so I'm putting it here
+ * instead of inlining it in TexEnv. */
+static GLenum r300TexUnitTarget(struct gl_texture_unit *unit) {
+	if (unit->_ReallyEnabled & (TEXTURE_RECT_BIT)) {
+		return GL_TEXTURE_RECTANGLE_NV;
+	} else if (unit->_ReallyEnabled & (TEXTURE_1D_BIT)) {
+		return GL_TEXTURE_1D;
+	} else if (unit->_ReallyEnabled & (TEXTURE_2D_BIT)) {
+		return GL_TEXTURE_2D;
+	} else if (unit->_ReallyEnabled & (TEXTURE_3D_BIT)) {
+		return GL_TEXTURE_3D;
+	} else if (unit->_ReallyEnabled & (TEXTURE_CUBE_BIT)) {
+		return GL_TEXTURE_CUBE_MAP;
+	}
+	if (unit->Enabled & (TEXTURE_RECT_BIT)) {
+		return GL_TEXTURE_RECTANGLE_NV;
+	} else if (unit->Enabled & (TEXTURE_1D_BIT)) {
+		return GL_TEXTURE_1D;
+	} else if (unit->Enabled & (TEXTURE_2D_BIT)) {
+		return GL_TEXTURE_2D;
+	} else if (unit->Enabled & (TEXTURE_3D_BIT)) {
+		return GL_TEXTURE_3D;
+	} else if (unit->Enabled & (TEXTURE_CUBE_BIT)) {
+		return GL_TEXTURE_CUBE_MAP;
+	}
+}
+
 static void r300TexEnv(GLcontext * ctx, GLenum target,
 		       GLenum pname, const GLfloat * param)
 {
@@ -981,10 +1021,8 @@ static void r300TexEnv(GLcontext * ctx, GLenum target,
 	 */
 	switch (pname) {
 	case GL_TEXTURE_LOD_BIAS_EXT: {
-		fprintf(stderr, "LOD Bias: %f\n", *param);
 		/* Needs to be relocated in order to make sure we got the right tmu */
 		GLfloat bias, min;
-		GLuint b;
 
 		/* The R300's LOD bias is a signed 2's complement value with a
 		 * range of -16.0 <= bias < 16.0.
@@ -996,21 +1034,16 @@ static void r300TexEnv(GLcontext * ctx, GLenum target,
 			"no_neg_lod_bias") ? 0.0 : -16.0;
 		bias = CLAMP(bias, min, 16.0);
 
-		b = (unsigned int)fabsf(ceilf(bias*31));
-		if (signbit(bias)) {
-			b ^= 0x3ff; /* 10 bits */
-		}
-		fprintf(stderr, "LOD Bias (hex): 0x%x\n", b);
-		b <<= 3;
-		b &= R300_LOD_BIAS_MASK;
+		/* This next part feels quite hackish;
+		 * is there a cleaner way? */
+		struct gl_texture_object *texObj;
+		GLenum target = r300TexUnitTarget(&ctx->Texture.Unit[ctx->Texture.CurrentUnit]);
+		texObj = _mesa_select_tex_object(ctx, &ctx->Texture.Unit[ctx->Texture.CurrentUnit], target);
+		r300TexObjPtr t = (r300TexObjPtr) texObj->DriverData;
+		texObj->LodBias = bias;
 
-		int unit = 1;
+		r300SetTexLodBias(t, texObj->LodBias);
 
-		if (b != (rmesa->hw.tex.filter_1.cmd[R300_TEX_CMD_0 + unit] & R300_LOD_BIAS_MASK)) {
-			rmesa->hw.tex.filter_1.cmd[R300_TEX_CMD_0 + unit] &= ~R300_LOD_BIAS_MASK;
-			rmesa->hw.tex.filter_1.cmd[R300_TEX_CMD_0 + unit] |= b;
-			R300_STATECHANGE(rmesa, tex.filter_1);
-		}
 		break;
 	}
 
-- 
2.7.4