Initial support for ARB_depth_texture

Currently only GL_DEPTH_COMPONENT16 are supported.  I don't know what the
hardware bits are to select the other formats, but it shouldn't be too hard
to figure out.

4 files changed, 77 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/r300/r300_context.c b/src/mesa/drivers/dri/r300/r300_context.c
index 14e0f052fd..d2ed3105d1 100644
--- a/src/mesa/drivers/dri/r300/r300_context.c
+++ b/src/mesa/drivers/dri/r300/r300_context.c
@@ -93,6 +93,8 @@ int hw_tcl_on = 1;
 
 const struct dri_extension card_extensions[] = {
   /* *INDENT-OFF* */
+  {"GL_ARB_depth_texture",		NULL},
+  {"GL_ARB_fragment_program",		NULL},
   {"GL_ARB_multisample",		GL_ARB_multisample_functions},
   {"GL_ARB_multitexture",		NULL},
   {"GL_ARB_texture_border_clamp",	NULL},
@@ -105,7 +107,6 @@ const struct dri_extension card_extensions[] = {
   {"GL_ARB_texture_mirrored_repeat",	NULL},
   {"GL_ARB_vertex_buffer_object",	GL_ARB_vertex_buffer_object_functions},
   {"GL_ARB_vertex_program",		GL_ARB_vertex_program_functions},
-  {"GL_ARB_fragment_program",		NULL},
   {"GL_EXT_blend_equation_separate",	GL_EXT_blend_equation_separate_functions},
   {"GL_EXT_blend_func_separate",	GL_EXT_blend_func_separate_functions},
   {"GL_EXT_blend_minmax",		GL_EXT_blend_minmax_functions},
@@ -130,6 +131,7 @@ const struct dri_extension card_extensions[] = {
   {"GL_NV_blend_square",		NULL},
   {"GL_NV_vertex_program",		GL_NV_vertex_program_functions},
   {"GL_SGIS_generate_mipmap",		NULL},
+  {"GL_SGIX_depth_texture",		NULL},
   {NULL,				NULL}
   /* *INDENT-ON* */
 };
diff --git a/src/mesa/drivers/dri/r300/r300_tex.c b/src/mesa/drivers/dri/r300/r300_tex.c
index 1805cecd0a..adf69a3c25 100644
--- a/src/mesa/drivers/dri/r300/r300_tex.c
+++ b/src/mesa/drivers/dri/r300/r300_tex.c
@@ -482,6 +482,25 @@ static const struct gl_texture_format *r300ChooseTextureFormat(GLcontext * ctx,
 	case GL_RGBA32F_ARB:
 		return &_mesa_texformat_rgba_float32;
 
+	case GL_DEPTH_COMPONENT:
+	case GL_DEPTH_COMPONENT16:
+	case GL_DEPTH_COMPONENT24:
+	case GL_DEPTH_COMPONENT32:
+#if 0
+		switch (type) {
+		case GL_UNSIGNED_BYTE:
+		case GL_UNSIGNED_SHORT:
+			return &_mesa_texformat_z16;
+		case GL_UNSIGNED_INT:
+			return &_mesa_texformat_z32;
+		case GL_UNSIGNED_INT_24_8_EXT:
+		default:
+			return &_mesa_texformat_z24_s8;
+		}
+#else
+		return &_mesa_texformat_z16;
+#endif
+
 	default:
 		_mesa_problem(ctx,
 			      "unexpected internalFormat 0x%x in r300ChooseTextureFormat",
@@ -1057,6 +1076,19 @@ static void r300TexParameter(GLcontext * ctx, GLenum target,
 		driSwapOutTextureObject((driTextureObject *) t);
 		break;
 
+	case GL_DEPTH_TEXTURE_MODE:
+		if (texObj->Image[0][texObj->BaseLevel]->TexFormat->BaseFormat 
+		    == GL_DEPTH_COMPONENT) {
+			r300SetDepthTexMode(texObj);
+			break;
+		} else {
+			/* If the texture isn't a depth texture, changing this
+			 * state won't cause any changes to the hardware.
+			 * Don't force a flush of texture state.
+			 */
+			return;
+		}
+
 	default:
 		return;
 	}
diff --git a/src/mesa/drivers/dri/r300/r300_tex.h b/src/mesa/drivers/dri/r300/r300_tex.h
index f67a8e6ba6..b86d45bfe0 100644
--- a/src/mesa/drivers/dri/r300/r300_tex.h
+++ b/src/mesa/drivers/dri/r300/r300_tex.h
@@ -35,6 +35,8 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #ifndef __r300_TEX_H__
 #define __r300_TEX_H__
 
+extern void r300SetDepthTexMode(struct gl_texture_object *tObj);
+
 extern void r300SetTexOffset(__DRIcontext *pDRICtx, GLint texname,
 			     unsigned long long offset, GLint depth,
 			     GLuint pitch);
diff --git a/src/mesa/drivers/dri/r300/r300_texstate.c b/src/mesa/drivers/dri/r300/r300_texstate.c
index 1d2909fd21..1c9851afb2 100644
--- a/src/mesa/drivers/dri/r300/r300_texstate.c
+++ b/src/mesa/drivers/dri/r300/r300_texstate.c
@@ -115,11 +115,45 @@ static const struct tx_table {
 	_ASSIGN(LUMINANCE_ALPHA_FLOAT16, R300_EASY_TX_FORMAT(X, X, X, Y, FL_I16A16)),
 	_ASSIGN(INTENSITY_FLOAT32, R300_EASY_TX_FORMAT(X, X, X, X, FL_I32)),
 	_ASSIGN(INTENSITY_FLOAT16, R300_EASY_TX_FORMAT(X, X, X, X, FL_I16)),
+	_ASSIGN(Z16, R300_EASY_TX_FORMAT(X, X, X, X, X16)),
+#if 0
+	_ASSIGN(Z24_S8, R300_EASY_TX_FORMAT(X, X, X, X, X24_Y8)),
+	_ASSIGN(Z32, R300_EASY_TX_FORMAT(X, X, X, X, X32)),
+#endif
 	/* *INDENT-ON* */
 };
 
 #undef _ASSIGN
 
+void r300SetDepthTexMode(struct gl_texture_object *tObj)
+{
+	r300TexObjPtr t;
+
+	if (!tObj)
+		return;
+
+	t = (r300TexObjPtr) tObj->DriverData;
+
+	switch (tObj->DepthMode) {
+	case GL_LUMINANCE:
+		t->format = R300_EASY_TX_FORMAT(X, X, X, X, X16);
+		break;
+	case GL_INTENSITY:
+		t->format = R300_EASY_TX_FORMAT(X, X, X, ONE, X16);
+		break;
+	case GL_ALPHA:
+		t->format = R300_EASY_TX_FORMAT(ZERO, ZERO, ZERO, X, X16);
+		break;
+	default:
+		/* Error...which should have already been caught by higher
+		 * levels of Mesa.
+		 */
+		ASSERT(0);
+		break;
+	}
+}
+
+
 /**
  * This function computes the number of bytes of storage needed for
  * the given texture object (all mipmap levels, all cube faces).
@@ -146,7 +180,12 @@ static void r300SetTexImages(r300ContextPtr rmesa,
 	 */
 	if (!t->image_override
 	    && VALID_FORMAT(baseImage->TexFormat->MesaFormat)) {
-		t->format = tx_table[baseImage->TexFormat->MesaFormat].format;
+		if (baseImage->TexFormat->BaseFormat == GL_DEPTH_COMPONENT) {
+			r300SetDepthTexMode(tObj);
+		} else {
+			t->format = tx_table[baseImage->TexFormat->MesaFormat].format;
+		}
+
 		t->filter |= tx_table[baseImage->TexFormat->MesaFormat].filter;
 	} else if (!t->image_override) {
 		_mesa_problem(NULL, "unexpected texture format in %s",