#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)
+{
+ 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:
+ bits = brw_multisample_positions_4x >> (8 * index);
+ break;
+ case 8:
+ bits = brw_multisample_positions_8x[index >> 2] >> (8 * (index & 3));
+ break;
+ default:
+ 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));
+}
/**
* 3DSTATE_MULTISAMPLE
gen6_emit_3dstate_multisample(struct brw_context *brw,
unsigned num_samples)
{
- struct intel_context *intel = &brw->intel;
-
- /* TODO: MSAA only implemented on Gen6 */
- if (intel->gen != 6) {
- assert(num_samples == 0);
+ uint32_t number_of_multisamples = 0;
+ uint32_t sample_positions_3210 = 0;
+ uint32_t sample_positions_7654 = 0;
+
+ assert(brw->gen < 8);
+
+ switch (num_samples) {
+ case 0:
+ case 1:
+ number_of_multisamples = MS_NUMSAMPLES_1;
+ break;
+ case 4:
+ number_of_multisamples = MS_NUMSAMPLES_4;
+ sample_positions_3210 = brw_multisample_positions_4x;
+ break;
+ case 8:
+ number_of_multisamples = MS_NUMSAMPLES_8;
+ sample_positions_3210 = brw_multisample_positions_8x[0];
+ sample_positions_7654 = brw_multisample_positions_8x[1];
+ break;
+ default:
+ unreachable("Unrecognized num_samples in gen6_emit_3dstate_multisample");
}
- int len = intel->gen >= 7 ? 4 : 3;
+ int len = brw->gen >= 7 ? 4 : 3;
BEGIN_BATCH(len);
OUT_BATCH(_3DSTATE_MULTISAMPLE << 16 | (len - 2));
- OUT_BATCH(MS_PIXEL_LOCATION_CENTER |
- (num_samples > 0 ? MS_NUMSAMPLES_4 : MS_NUMSAMPLES_1));
- OUT_BATCH(num_samples > 0 ? 0xae2ae662 : 0); /* positions for 4/8-sample */
- if (intel->gen >= 7)
- OUT_BATCH(0);
+ OUT_BATCH(MS_PIXEL_LOCATION_CENTER | number_of_multisamples);
+ OUT_BATCH(sample_positions_3210);
+ if (brw->gen >= 7)
+ OUT_BATCH(sample_positions_7654);
ADVANCE_BATCH();
}
+unsigned
+gen6_determine_sample_mask(struct brw_context *brw)
+{
+ struct gl_context *ctx = &brw->ctx;
+ float coverage = 1.0f;
+ float coverage_invert = false;
+ unsigned sample_mask = ~0u;
+
+ /* BRW_NEW_NUM_SAMPLES */
+ unsigned num_samples = brw->num_samples;
+
+ if (ctx->Multisample._Enabled) {
+ if (ctx->Multisample.SampleCoverage) {
+ coverage = ctx->Multisample.SampleCoverageValue;
+ coverage_invert = ctx->Multisample.SampleCoverageInvert;
+ }
+ if (ctx->Multisample.SampleMask) {
+ sample_mask = ctx->Multisample.SampleMaskValue;
+ }
+ }
+
+ 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 num_samples)
+gen6_emit_3dstate_sample_mask(struct brw_context *brw, unsigned mask)
{
- struct intel_context *intel = &brw->intel;
-
- /* TODO: MSAA only implemented on Gen6 */
- if (intel->gen != 6) {
- assert(num_samples == 0);
- }
-
BEGIN_BATCH(2);
OUT_BATCH(_3DSTATE_SAMPLE_MASK << 16 | (2 - 2));
- OUT_BATCH(num_samples > 0 ? 15 : 1);
+ OUT_BATCH(mask);
ADVANCE_BATCH();
}
-
-static void upload_multisample_state(struct brw_context *brw)
+static void
+upload_multisample_state(struct brw_context *brw)
{
- struct intel_context *intel = &brw->intel;
- struct gl_context *ctx = &intel->ctx;
- unsigned num_samples = 0;
-
- /* _NEW_BUFFERS */
- if (ctx->DrawBuffer->_ColorDrawBuffers[0])
- num_samples = ctx->DrawBuffer->_ColorDrawBuffers[0]->NumSamples;
-
- /* 3DSTATE_MULTISAMPLE is nonpipelined. */
- intel_emit_post_sync_nonzero_flush(intel);
-
- gen6_emit_3dstate_multisample(brw, num_samples);
- gen6_emit_3dstate_sample_mask(brw, num_samples);
+ /* 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,
- .brw = BRW_NEW_CONTEXT,
- .cache = 0
+ .mesa = _NEW_MULTISAMPLE,
+ .brw = BRW_NEW_CONTEXT |
+ BRW_NEW_NUM_SAMPLES,
},
.emit = upload_multisample_state
};
projects / mesa.git / blobdiff