#include "brw_context.h"
#include "brw_defines.h"
#include "brw_multisample_state.h"
+#include "main/framebuffer.h"
void
gen6_get_sample_position(struct gl_context *ctx,
struct gl_framebuffer *fb,
GLuint index, GLfloat *result)
{
- switch (fb->Visual.samples) {
+ uint8_t bits;
+
+ switch (_mesa_geometric_samples(fb)) {
case 1:
result[0] = result[1] = 0.5f;
+ return;
+ case 2:
+ bits = brw_multisample_positions_1x_2x >> (8 * index);
break;
- case 4: {
- uint8_t val = (uint8_t)(brw_multisample_positions_4x[0] >> (8*index));
- result[0] = ((val >> 4) & 0xf) / 16.0f;
- result[1] = (val & 0xf) / 16.0f;
+ case 4:
+ bits = brw_multisample_positions_4x >> (8 * index);
break;
- }
- case 8: {
- uint8_t val = (uint8_t)(brw_multisample_positions_8x[index>>2] >> (8*(index & 3)));
- result[0] = ((val >> 4) & 0xf) / 16.0f;
- result[1] = (val & 0xf) / 16.0f;
+ case 8:
+ bits = brw_multisample_positions_8x[index >> 2] >> (8 * (index & 3));
break;
- }
default:
- assert(!"Not implemented");
+ unreachable("Not implemented");
}
+
+ /* Convert from U0.4 back to a floating point coordinate. */
+ result[0] = ((bits >> 4) & 0xf) / 16.0f;
+ result[1] = (bits & 0xf) / 16.0f;
+}
+
+/**
+ * Sample index layout shows the numbering of slots in a rectangular
+ * grid of samples with in a pixel. Sample number layout shows the
+ * rectangular grid of samples roughly corresponding to the real sample
+ * locations with in a pixel. Sample number layout matches the sample
+ * index layout in case of 2X and 4x MSAA, but they are different in
+ * case of 8X MSAA.
+ *
+ * 2X MSAA sample index / number layout
+ * ---------
+ * | 0 | 1 |
+ * ---------
+ *
+ * 4X MSAA sample index / number layout
+ * ---------
+ * | 0 | 1 |
+ * ---------
+ * | 2 | 3 |
+ * ---------
+ *
+ * 8X MSAA sample index layout 8x MSAA sample number layout
+ * --------- ---------
+ * | 0 | 1 | | 5 | 2 |
+ * --------- ---------
+ * | 2 | 3 | | 4 | 6 |
+ * --------- ---------
+ * | 4 | 5 | | 0 | 3 |
+ * --------- ---------
+ * | 6 | 7 | | 7 | 1 |
+ * --------- ---------
+ *
+ * A sample map is used to map sample indices to sample numbers.
+ */
+void
+gen6_set_sample_maps(struct gl_context *ctx)
+{
+ uint8_t map_2x[2] = {0, 1};
+ uint8_t map_4x[4] = {0, 1, 2, 3};
+ uint8_t map_8x[8] = {5, 2, 4, 6, 0, 3, 7, 1};
+
+ memcpy(ctx->Const.SampleMap2x, map_2x, sizeof(map_2x));
+ memcpy(ctx->Const.SampleMap4x, map_4x, sizeof(map_4x));
+ memcpy(ctx->Const.SampleMap8x, map_8x, sizeof(map_8x));
}
/**
uint32_t sample_positions_3210 = 0;
uint32_t sample_positions_7654 = 0;
+ assert(brw->gen < 8);
+
switch (num_samples) {
case 0:
case 1:
break;
case 4:
number_of_multisamples = MS_NUMSAMPLES_4;
- sample_positions_3210 = brw_multisample_positions_4x[0];
+ sample_positions_3210 = brw_multisample_positions_4x;
break;
case 8:
number_of_multisamples = MS_NUMSAMPLES_8;
sample_positions_7654 = brw_multisample_positions_8x[1];
break;
default:
- assert(!"Unrecognized num_samples in gen6_emit_3dstate_multisample");
- break;
+ unreachable("Unrecognized num_samples in gen6_emit_3dstate_multisample");
}
- /* 3DSTATE_MULTISAMPLE is nonpipelined. */
- intel_emit_post_sync_nonzero_flush(brw);
-
int len = brw->gen >= 7 ? 4 : 3;
BEGIN_BATCH(len);
OUT_BATCH(_3DSTATE_MULTISAMPLE << 16 | (len - 2));
ADVANCE_BATCH();
}
-
-/**
- * 3DSTATE_SAMPLE_MASK
- */
-void
-gen6_emit_3dstate_sample_mask(struct brw_context *brw,
- unsigned num_samples, float coverage,
- bool coverage_invert, unsigned sample_mask)
-{
- BEGIN_BATCH(2);
- OUT_BATCH(_3DSTATE_SAMPLE_MASK << 16 | (2 - 2));
- if (num_samples > 1) {
- int coverage_int = (int) (num_samples * coverage + 0.5);
- uint32_t coverage_bits = (1 << coverage_int) - 1;
- if (coverage_invert)
- coverage_bits ^= (1 << num_samples) - 1;
- OUT_BATCH(coverage_bits & sample_mask);
- } else {
- OUT_BATCH(1);
- }
- ADVANCE_BATCH();
-}
-
-
-static void upload_multisample_state(struct brw_context *brw)
+unsigned
+gen6_determine_sample_mask(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
- float coverage = 1.0;
+ float coverage = 1.0f;
float coverage_invert = false;
unsigned sample_mask = ~0u;
- /* _NEW_BUFFERS */
- unsigned num_samples = ctx->DrawBuffer->Visual.samples;
+ /* BRW_NEW_NUM_SAMPLES */
+ unsigned num_samples = brw->num_samples;
- /* _NEW_MULTISAMPLE */
if (ctx->Multisample._Enabled) {
if (ctx->Multisample.SampleCoverage) {
coverage = ctx->Multisample.SampleCoverageValue;
}
}
- gen6_emit_3dstate_multisample(brw, num_samples);
- gen6_emit_3dstate_sample_mask(brw, num_samples, coverage,
- coverage_invert, sample_mask);
+ if (num_samples > 1) {
+ int coverage_int = (int) (num_samples * coverage + 0.5f);
+ uint32_t coverage_bits = (1 << coverage_int) - 1;
+ if (coverage_invert)
+ coverage_bits ^= (1 << num_samples) - 1;
+ return coverage_bits & sample_mask;
+ } else {
+ return 1;
+ }
+}
+
+/**
+ * 3DSTATE_SAMPLE_MASK
+ */
+void
+gen6_emit_3dstate_sample_mask(struct brw_context *brw, unsigned mask)
+{
+ BEGIN_BATCH(2);
+ OUT_BATCH(_3DSTATE_SAMPLE_MASK << 16 | (2 - 2));
+ OUT_BATCH(mask);
+ ADVANCE_BATCH();
}
+static void
+upload_multisample_state(struct brw_context *brw)
+{
+ /* BRW_NEW_NUM_SAMPLES */
+ gen6_emit_3dstate_multisample(brw, brw->num_samples);
+ gen6_emit_3dstate_sample_mask(brw, gen6_determine_sample_mask(brw));
+}
const struct brw_tracked_state gen6_multisample_state = {
.dirty = {
- .mesa = _NEW_BUFFERS |
- _NEW_MULTISAMPLE,
- .brw = BRW_NEW_CONTEXT,
- .cache = 0
+ .mesa = _NEW_MULTISAMPLE,
+ .brw = BRW_NEW_CONTEXT |
+ BRW_NEW_NUM_SAMPLES,
},
.emit = upload_multisample_state
};