1 /*
2 * video output handling using plugin_lib
3 * (C) Gražvydas "notaz" Ignotas, 2011
4 *
5 * This work is licensed under the terms of any of these licenses
6 * (at your option):
7 * - GNU GPL, version 2 or later.
8 * - GNU LGPL, version 2.1 or later.
9 * See the COPYING file in the top-level directory.
10 */
11
12 #include <string.h>
13 #include "gpu.h"
14 #include "../../frontend/plugin_lib.h"
15
16 static const struct rearmed_cbs *cbs;
17
vout_init(void)18 int vout_init(void)
19 {
20 return 0;
21 }
22
vout_finish(void)23 int vout_finish(void)
24 {
25 return 0;
26 }
27
check_mode_change(int force)28 static void check_mode_change(int force)
29 {
30 static uint32_t old_status;
31 static int old_h;
32 int w = gpu.screen.hres;
33 int h = gpu.screen.h;
34 int w_out = w;
35 int h_out = h;
36
37 gpu.state.enhancement_active =
38 gpu.get_enhancement_bufer != NULL && gpu.state.enhancement_enable
39 && w <= 512 && h <= 256 && !gpu.status.rgb24;
40
41 if (gpu.state.enhancement_active) {
42 w_out *= 2;
43 h_out *= 2;
44 }
45
46 gpu.state.downscale_active =
47 gpu.get_downscale_buffer != NULL && gpu.state.downscale_enable
48 && (w >= 512 || h >= 256);
49
50 if (gpu.state.downscale_active) {
51 w_out = w < 512 ? w : 320;
52 h_out = h < 256 ? h : h / 2;
53 }
54
55 // width|rgb24 change?
56 if (force || (gpu.status.reg ^ old_status) & ((7<<16)|(1<<21)) || h != old_h)
57 {
58 old_status = gpu.status.reg;
59 old_h = h;
60
61 cbs->pl_vout_set_mode(w_out, h_out, w, h, gpu.status.rgb24 ? 24 : 16);
62 }
63 }
64
vout_update(void)65 void vout_update(void)
66 {
67 int x = gpu.screen.x & ~1; // alignment needed by blitter
68 int y = gpu.screen.y;
69 int w = gpu.screen.w;
70 int h = gpu.screen.h;
71 uint16_t *vram = gpu.vram;
72 int vram_h = 512;
73
74 if (w == 0 || h == 0)
75 return;
76
77 check_mode_change(0);
78 if (gpu.state.enhancement_active)
79 vram = gpu.get_enhancement_bufer(&x, &y, &w, &h, &vram_h);
80
81 if (gpu.state.downscale_active)
82 vram = gpu.get_downscale_buffer(&x, &y, &w, &h, &vram_h);
83
84 if (y + h > vram_h) {
85 if (y + h - vram_h > h / 2) {
86 // wrap
87 h -= vram_h - y;
88 y = 0;
89 }
90 else
91 // clip
92 h = vram_h - y;
93 }
94
95 vram += y * 1024 + x;
96
97 cbs->pl_vout_flip(vram, 1024, gpu.status.rgb24, w, h);
98 }
99
vout_blank(void)100 void vout_blank(void)
101 {
102 int w = gpu.screen.hres;
103 int h = gpu.screen.h;
104
105 check_mode_change(0);
106 if (gpu.state.enhancement_active) {
107 w *= 2;
108 h *= 2;
109 }
110 cbs->pl_vout_flip(NULL, 1024, gpu.status.rgb24, w, h);
111 }
112
GPUopen(void ** unused)113 long GPUopen(void **unused)
114 {
115 gpu.frameskip.active = 0;
116 gpu.frameskip.frame_ready = 1;
117
118 cbs->pl_vout_open();
119 check_mode_change(1);
120 vout_update();
121 return 0;
122 }
123
GPUclose(void)124 long GPUclose(void)
125 {
126 cbs->pl_vout_close();
127 return 0;
128 }
129
vout_set_config(const struct rearmed_cbs * cbs_)130 void vout_set_config(const struct rearmed_cbs *cbs_)
131 {
132 cbs = cbs_;
133 }
134
135 // vim:shiftwidth=2:expandtab
136