basic rewrite of nv30 demo

1 files changed, 94 insertions, 0 deletions

diff --git a/screen.c b/screen.c
new file mode 100644
index 0000000..ffd2efc
--- /dev/null
+++ b/screen.c
@@ -0,0 +1,94 @@
+/* Definitions for front buffer */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <xf86drm.h>
+#include <nouveau_drm.h>
+
+/* Global variables */
+
+int screen_width;
+int screen_height;	
+int screen_bpp;
+int screen_offset;
+
+int screen_pitch;
+
+uint32_t vram_base_phys = 0;
+uint32_t vram_size = 0;
+uint32_t tt_base_phys  = 0;
+uint32_t tt_size = 0;
+
+int drm_fd = -1;
+
+/* Local variables */
+
+static int drm_ready = 0;
+static drm_context_t drm_context;
+
+/* Local functions */
+
+static uint64_t get_param(unsigned int param);
+
+/* Functions */
+
+int screen_open(int width, int height, int bpp)
+{
+	int ret;
+
+	drm_fd = drmOpen("nouveau", 0);
+	if (drm_fd < 0) {
+		drmError(drm_fd, __func__);
+		fprintf(stderr, "failed to open drm\n");
+		return 1;
+	}
+
+	ret=drmCreateContext(drm_fd, &drm_context);
+	if (ret) {
+		drmError(ret, __func__);
+		fprintf(stderr, "failed to create context: %d\n", ret);
+		return 1;
+	}
+
+	screen_width = width;
+	screen_height = height;
+	screen_bpp = bpp;
+	screen_offset = 0;	/* Can we get front buffer offset in vram? */
+	screen_pitch = screen_width*(screen_bpp/8);
+	screen_pitch = (screen_pitch | 255)+1;	/* Align on 256 bytes boundary */
+
+	printf("Screen: %dx%dx%d, pitch=%d, offset=0x%08x\n",
+		screen_width, screen_height, screen_bpp,
+		screen_pitch, screen_offset
+	);
+
+	vram_base_phys = (uint32_t) get_param(NOUVEAU_GETPARAM_FB_PHYSICAL);
+	vram_size = (uint32_t) get_param(NOUVEAU_GETPARAM_FB_SIZE);
+	printf("VRAM:\t%p 0x%08x\n", vram_base_phys, vram_size);
+
+	tt_base_phys = (uint32_t) get_param(NOUVEAU_GETPARAM_AGP_PHYSICAL);
+	tt_size = (uint32_t) get_param(NOUVEAU_GETPARAM_AGP_SIZE);
+	printf("TT:\t%p 0x%08x\n", tt_base_phys, tt_size);
+
+	drm_ready=1;
+	return 0;
+}
+
+void screen_close(void)
+{
+	if (drm_ready) {
+		drmDestroyContext(drm_fd, drm_context);
+	}
+	if (drm_fd>=0) {
+		drmClose(drm_fd);
+	}
+}
+
+static uint64_t get_param(unsigned int param)
+{
+	struct drm_nouveau_getparam getp;
+
+	getp.param = param;
+	drmCommandWriteRead(drm_fd, DRM_NOUVEAU_GETPARAM, &getp, sizeof(getp));
+	return getp.value;
+}