X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=narabu.cpp;h=0ac4f71d75ab58794da432e64c22ea0811cdb437;hb=daf421e32981645e551621551c6b82697ad078de;hp=898f7efeec4b343a7b011bcea85b8376a223873a;hpb=69e36d8b488476d9d0e23f5b54eb18a4f9b5fbdd;p=narabu

diff --git a/narabu.cpp b/narabu.cpp
index 898f7ef..0ac4f71 100644
--- a/narabu.cpp
+++ b/narabu.cpp
@@ -19,6 +19,11 @@ using namespace std::chrono;
 
 #define WIDTH 1280
 #define HEIGHT 720
+#define WIDTH_BLOCKS (WIDTH/8)
+#define WIDTH_BLOCKS_CHROMA (WIDTH/16)
+#define HEIGHT_BLOCKS (HEIGHT/8)
+#define NUM_BLOCKS (WIDTH_BLOCKS * HEIGHT_BLOCKS)
+#define NUM_BLOCKS_CHROMA (WIDTH_BLOCKS_CHROMA * HEIGHT_BLOCKS)
 
 const unsigned prob_bits = 12;
 const unsigned prob_scale = 1 << prob_bits;
@@ -54,10 +59,12 @@ optional<uint32_t> read_varint(const char **ptr, const char *end)
 	return nullopt;  // Error: EOF.
 }
 
+const unsigned num_blocks = ((NUM_BLOCKS + BLOCKS_PER_STREAM - 1) / BLOCKS_PER_STREAM);
+
 struct CoeffStream {
         uint src_offset, src_len;
 };
-CoeffStream streams[45 * 64];  // HACK
+CoeffStream streams[num_blocks * 64];
 
 int main(int argc, char **argv)
 {
@@ -202,8 +209,6 @@ int main(int argc, char **argv)
 	GLint num_blocks_pos = glGetUniformLocation(glsl_program_num, "num_blocks");
 	printf("%d err=0x%x pos=%d,%d,%d,%d\n", __LINE__, glGetError(), cum2sym_tex_pos, dsyms_tex_pos, out_tex_pos, sign_bias_pos);
 
-	unsigned num_blocks = (HEIGHT / 16);
-
 	// Bind the textures.
 	glUniform1i(cum2sym_tex_pos, 0);
 	glUniform1i(dsyms_tex_pos, 1);
@@ -218,20 +223,29 @@ int main(int argc, char **argv)
 	printf("%d err=0x%x\n", __LINE__, glGetError());
 
 	// Decode all luma blocks.
+	size_t last_src_offset = 0, last_src_len = 0;
 	for (unsigned y = 0; y < 8; ++y) {
                 for (unsigned x = 0; x < 8; ++x) {
 			unsigned coeff_num = y * 8 + x;
 
-			for (unsigned yb = 0; yb < HEIGHT; yb += 16) {
+			for (unsigned block_idx = 0; block_idx < NUM_BLOCKS; block_idx += BLOCKS_PER_STREAM) {
 				optional<uint32_t> num_rans_bytes = read_varint(&ptr, end);
 				if (!num_rans_bytes) {
-					fprintf(stderr, "Error parsing varint for block %d rANS bytes\n", yb);
+					fprintf(stderr, "Error parsing varint for block %d rANS bytes\n", block_idx);
 					exit(1);
 				}
 
-				CoeffStream *stream = &streams[coeff_num * num_blocks + (yb/16)];
-				stream->src_offset = ptr - coded.data();
-				stream->src_len = *num_rans_bytes;
+				CoeffStream *stream = &streams[coeff_num * num_blocks + block_idx / BLOCKS_PER_STREAM];
+				if (*num_rans_bytes == 0) {
+					// Repeat last stream.
+					stream->src_offset = last_src_offset;
+					stream->src_len = last_src_len;
+				} else {
+					stream->src_offset = ptr - coded.data();
+					stream->src_len = *num_rans_bytes;
+					last_src_offset = stream->src_offset;
+					last_src_len = last_src_len;
+				}
 
 				// TODO: check len
 				ptr += *num_rans_bytes;
@@ -266,7 +280,8 @@ int main(int argc, char **argv)
 
 #define PARALLEL_SLICES 1
 	steady_clock::time_point start = steady_clock::now();
-	for (int i = 0; i < 1000; ++i) {
+	unsigned num_iterations = 1000;
+	for (unsigned i = 0; i < num_iterations; ++i) {
 		unsigned num_slices = (WIDTH/8)*(HEIGHT/8)/BLOCKS_PER_STREAM;
 		glDispatchCompute(1, (num_slices+PARALLEL_SLICES-1)/PARALLEL_SLICES, 1);
 	}
@@ -368,5 +383,5 @@ int main(int argc, char **argv)
 	glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0); // unbind
 	
 	printf("foo = 0x%x\n", glGetError());
-	printf("Each iteration took %.3f ms.\n", 1e3 * duration<double>(now - start).count() / 1000);
+	printf("Each iteration took %.3f ms.\n", 1e3 * duration<double>(now - start).count() / num_iterations);
 }