r300: No assertion when accessing incomplete texture images.

There used to be an assertion when a fragment program accesses an incomplete
texture image. Work around this assertion.
Note: I am unsure whether this workaround produces the desired result
(0,0,0,1) on all hardware.

3 files changed, 17 insertions, 16 deletions

diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index fe261dbbc6..fa0f55446b 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -602,12 +602,6 @@ extern int hw_tcl_on;
 /* Should but doesnt work */
 //#define CURRENT_VERTEX_SHADER(ctx) (R300_CONTEXT(ctx)->curr_vp)
 
-//#define TMU_ENABLED(ctx, unit) (hw_tcl_on ? ctx->Texture.Unit[unit]._ReallyEnabled && (OutputsWritten & (1<<(VERT_RESULT_TEX0+(unit)))) :
-//	(r300->state.render_inputs & (_TNL_BIT_TEX0<<(unit))))
-//#define TMU_ENABLED(ctx, unit) (hw_tcl_on ? ctx->Texture.Unit[unit]._ReallyEnabled && OutputsWritten & (1<<(VERT_RESULT_TEX0+(unit))) :
-//	ctx->Texture.Unit[unit]._ReallyEnabled && r300->state.render_inputs & (_TNL_BIT_TEX0<<(unit)))
-
-#define TMU_ENABLED(ctx, unit) (ctx->Texture.Unit[unit]._ReallyEnabled)
 
 /* r300_vertex_shader_state and r300_vertex_program should probably be merged together someday.
  * Keeping them them seperate for now should ensure fixed pipeline keeps functioning properly.
diff --git a/src/mesa/drivers/dri/r300/r300_reg.h b/src/mesa/drivers/dri/r300/r300_reg.h
index 1f4a2d2e64..1f65f9a7e7 100644
--- a/src/mesa/drivers/dri/r300/r300_reg.h
+++ b/src/mesa/drivers/dri/r300/r300_reg.h
@@ -325,7 +325,7 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
  * Most likely this is used to ignore rest of the program in cases
  * where group of verts arent visible. For some reason this "section"
  * is sometimes accepted other instruction that have no relationship with
- *position calculations. 
+ *position calculations.
  */
 #define R300_VAP_PVS_CNTL_1                 0x22D0
 #       define R300_PVS_CNTL_1_PROGRAM_START_SHIFT   0
@@ -566,8 +566,8 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define R300_RE_FOG_SCALE                     0x4294
 #define R300_RE_FOG_START                     0x4298
 
-/* Not sure why there are duplicate of factor and constant values. 
- * My best guess so far is that there are seperate zbiases for test and write. 
+/* Not sure why there are duplicate of factor and constant values.
+ * My best guess so far is that there are seperate zbiases for test and write.
  * Ordering might be wrong.
  * Some of the tests indicate that fgl has a fallback implementation of zbias
  * via pixel shaders.
@@ -909,7 +909,7 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 /* 32 bit chroma key */
 #define R300_TX_CHROMA_KEY_0                      0x4580
 /* ff00ff00 == { 0, 1.0, 0, 1.0 } */
-#define R300_TX_BORDER_COLOR_0              0x45C0 
+#define R300_TX_BORDER_COLOR_0              0x45C0
 
 /* END: Texture specification */
 
@@ -999,6 +999,7 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 #		define R300_FPITX_OP_KIL	2
 #		define R300_FPITX_OP_TXP	3
 #		define R300_FPITX_OP_TXB	4
+#	define R300_FPITX_OPCODE_MASK           (7 << 15)
 
 /* ALU
  * The ALU instructions register blocks are enumerated according to the order
diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index ef23a61618..4fd80e60fe 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -1239,7 +1239,7 @@ void r300_setup_textures(GLcontext *ctx)
 
 	/* We cannot let disabled tmu offsets pass DRM */
 	for(i=0; i < mtu; i++) {
-		if(TMU_ENABLED(ctx, i)) {
+		if (ctx->Texture.Unit[i]._ReallyEnabled) {
 
 #if 0 /* Enables old behaviour */
 			hw_tmu = i;
@@ -1299,6 +1299,7 @@ void r300_setup_textures(GLcontext *ctx)
 
 	for(i = 0; i < rp->tex.length; i++){
 		int unit;
+		int opcode;
 		unsigned long val;
 
 		unit = rp->tex.inst[i] >> R300_FPITX_IMAGE_SHIFT;
@@ -1307,13 +1308,18 @@ void r300_setup_textures(GLcontext *ctx)
 		val = rp->tex.inst[i];
 		val &= ~R300_FPITX_IMAGE_MASK;
 
-		if (((val >> R300_FPITX_OPCODE_SHIFT) & 7) == R300_FPITX_OP_KIL) {
+		opcode = (val & R300_FPITX_OPCODE_MASK) >> R300_FPITX_OPCODE_SHIFT;
+		if (opcode == R300_FPITX_OP_KIL) {
 			r300->hw.fpt.cmd[R300_FPT_INSTR_0+i] = val;
 		} else {
-			assert(tmu_mappings[unit] >= 0);
-
-			val |= tmu_mappings[unit] << R300_FPITX_IMAGE_SHIFT;
-			r300->hw.fpt.cmd[R300_FPT_INSTR_0+i] = val;
+			if (tmu_mappings[unit] >= 0) {
+				val |= tmu_mappings[unit] << R300_FPITX_IMAGE_SHIFT;
+				r300->hw.fpt.cmd[R300_FPT_INSTR_0+i] = val;
+			} else {
+				// We get here when the corresponding texture image is incomplete
+				// (e.g. incomplete mipmaps etc.)
+				r300->hw.fpt.cmd[R300_FPT_INSTR_0+i] = val;
+			}
 		}
 	}