From 8ea8da50d1f01fbbfce9e752d73a9303334555b4 Mon Sep 17 00:00:00 2001
From: Xavier Del Campo Romero <xavi.dcr@tutanota.com>
Date: Sun, 8 Nov 2020 02:34:04 +0100
Subject: Upload TIM files into VRAM

---
 src/gfx/inc/gfx.h | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 src/gfx/inc/gfx.h

(limited to 'src/gfx/inc')

diff --git a/src/gfx/inc/gfx.h b/src/gfx/inc/gfx.h
new file mode 100644
index 0000000..849fc8e
--- /dev/null
+++ b/src/gfx/inc/gfx.h
@@ -0,0 +1,82 @@
+#ifndef GFX_H
+#define GFX_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+enum
+{
+    SCREEN_X = 368,
+    SCREEN_Y = 240
+};
+
+/*   0-3   Texture page X Base   (N*64) (ie. in 64-halfword steps)    ;GPUSTAT.0-3
+  4     Texture page Y Base   (N*256) (ie. 0 or 256)               ;GPUSTAT.4
+  5-6   Semi Transparency     (0=B/2+F/2, 1=B+F, 2=B-F, 3=B+F/4)   ;GPUSTAT.5-6
+  7-8   Texture page colors   (0=4bit, 1=8bit, 2=15bit, 3=Reserved);GPUSTAT.7-8
+  9     Dither 24bit to 15bit (0=Off/strip LSBs, 1=Dither Enabled) ;GPUSTAT.9
+  10    Drawing to display area (0=Prohibited, 1=Allowed)          ;GPUSTAT.10
+  11    Texture Disable (0=Normal, 1=Disable if GP1(09h).Bit0=1)   ;GPUSTAT.15
+          (Above might be chipselect for (absent) second VRAM chip?)
+  12    Textured Rectangle X-Flip   (BIOS does set this bit on power-up...?)
+  13    Textured Rectangle Y-Flip   (BIOS does set it equal to GPUSTAT.13...?)
+  14-23 Not used (should be 0)
+  24-31 Command  (E1h)*/
+union gfx_common
+{
+    struct
+    {
+        uint32_t tpagex :4;
+        uint32_t tpagey :1;
+        uint32_t stp :2;
+        uint32_t bpp :2;
+        uint32_t dither :1;
+        uint32_t draw_to_disp :1;
+        uint32_t disable :1;
+        uint32_t xflip :1;
+        uint32_t yflip :1;
+        uint32_t :10;
+        uint8_t cmd;
+    };
+
+    uint32_t mask;
+};
+
+union gfx_sznext
+{
+    struct
+    {
+        uint32_t next :24;
+        uint32_t sz :8;
+    };
+
+    uint32_t cmd_next;
+};
+
+struct gfx_sprite
+{
+    union gfx_sznext sznext;
+    union gfx_common common;
+    uint8_t r, g, b;
+    uint8_t cmd;
+    uint16_t x, y;
+    uint16_t clutid;
+    uint8_t u, v;
+    uint16_t w, h;
+};
+
+int gfx_init(void);
+void gfx_draw(void);
+void gfx_sprite_init(struct gfx_sprite *s);
+void gfx_sprite_sort(struct gfx_sprite *s);
+int gfx_sprite_from_file(const char *path, struct gfx_sprite *s);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* GFX_H */
-- 
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