X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=erebus2020;a=blobdiff_plain;f=liberebus%2Fsrc%2Ferebus.c;h=af2b2d9df078d2298a35e693a6e5f8521b6a53ad;hp=da0763520ed8de6017418bdf3c66531562354ef3;hb=399df0323dcd1cafe860565fd82598321aff52ee;hpb=2e09068ea0c58f8a464f8584b2bb4e9f23241e95

diff --git a/liberebus/src/erebus.c b/liberebus/src/erebus.c
index da07635..af2b2d9 100644
--- a/liberebus/src/erebus.c
+++ b/liberebus/src/erebus.c
@@ -1,10 +1,95 @@
+#include <stdio.h>
 #include "erebus.h"
 
-int erb_init(void)
+struct erb_rend {
+	int fb_width, fb_height, fb_npix;
+	float *fb_pixels;
+	int *fb_nsamples;
+};
+
+struct erb_rend *erb_create(void)
+{
+	struct erb_rend *erb;
+
+	if(!(erb = calloc(1, sizeof *erb))) {
+		return 0;
+	}
+	return erb;
+}
+
+void erb_destroy(struct erb_rend *erb)
 {
+	if(!erb) return;
+	free(erb->fb_pixels);
+	free(erb);
+}
+
+int erb_allocframe(struct erb_rend *erb, int width, int height)
+{
+	float *newfb;
+	int *newns;
+	int npix;
+
+	if(width == erb->fb_width && height == erb->fb_height) {
+		return 0;
+	}
+
+	npix = width * height;
+
+	if(!(newfb = malloc(npix * 3 * sizeof *erb->fb_pixels))) {
+		goto err;
+	}
+	if(!(newns = malloc(npix * sizeof *erb->fb_nsamples))) {
+		free(newfb);
+		goto err;
+	}
+
+	free(erb->fb_pixels);
+	free(erb->fb_nsamples);
+
+	erb->fb_pixels = newfb;
+	erb->fb_nsamples = newns;
+	erb->fb_width = width;
+	erb->fb_height = height;
+	erb->fb_npix = npix;
 	return 0;
+
+err:
+	fprintf(stderr, "erb_allocframe: failed to allocate %dx%d framebuffer\n", width, height);
+	return -1;
+}
+
+float *erb_getframe(struct erb_rend *erb)
+{
+	return erb->fb_pixels;
 }
 
-void erb_cleanup(void)
+void erb_begin(struct erb_rend *erb)
 {
+	memset(erb->fb_pixels, 0, erb->fb_npix * 3 * sizeof *erb->fb_pixels);
+	memset(erb->fb_nsamples, 0, erb->fb_npix * sizeof *erb->fb_nsamples);
+}
+
+float *erb_end(struct erb_rend *erb)
+{
+	int i, n;
+	float s;
+	float *pptr = erb->fb_pixels;
+	int *nptr = erb->fb_nsamples;
+
+	for(i=0; i<erb->fb_npix; i++) {
+		n = *nptr;
+		if(n > 1) {
+			s = 1.0f / n;
+			*pptr++ *= s;
+			*pptr++ *= s;
+			*pptr++ *= s;
+			*nptr++ = 1;
+		} else {
+			pptr += 3;
+			nptr++;
+		}
+	}
+
+	return erb->fb_pixels;
 }