81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
#ifndef EVAS_ENGINE_GL_SHARED_H
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#define EVAS_ENGINE_GL_SHARED_H
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#include "../software_generic/Evas_Engine_Software_Shared.h"
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typedef enum _Evas_Engine_Info_Gl_Swap_Mode
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{
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EVAS_ENGINE_GL_SWAP_MODE_AUTO = 0,
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EVAS_ENGINE_GL_SWAP_MODE_FULL = 1,
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EVAS_ENGINE_GL_SWAP_MODE_COPY = 2,
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EVAS_ENGINE_GL_SWAP_MODE_DOUBLE = 3,
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EVAS_ENGINE_GL_SWAP_MODE_TRIPLE = 4,
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EVAS_ENGINE_GL_SWAP_MODE_QUADRUPLE = 5
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} Evas_Engine_Info_Gl_Swap_Mode;
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static inline Render_Engine_Swap_Mode
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evas_render_engine_gl_swap_mode_get(Evas_Engine_Info_Gl_Swap_Mode info_swap_mode)
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{
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Render_Engine_Swap_Mode swap_mode = MODE_FULL;
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const char *s;
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s = getenv("EVAS_GL_SWAP_MODE");
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if (s)
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{
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if ((!strcasecmp(s, "full")) || (!strcasecmp(s, "f")))
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swap_mode = MODE_FULL;
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else if ((!strcasecmp(s, "copy")) || (!strcasecmp(s, "c")))
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swap_mode = MODE_COPY;
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else if ((!strcasecmp(s, "double")) ||
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(!strcasecmp(s, "d")) || (!strcasecmp(s, "2")))
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swap_mode = MODE_DOUBLE;
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else if ((!strcasecmp(s, "triple")) ||
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(!strcasecmp(s, "t")) || (!strcasecmp(s, "3")))
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swap_mode = MODE_TRIPLE;
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else if ((!strcasecmp(s, "quadruple")) ||
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(!strcasecmp(s, "q")) || (!strcasecmp(s, "4")))
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swap_mode = MODE_QUADRUPLE;
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}
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else
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{
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// in most gl implementations - egl and glx here that we care about the TEND
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// to either swap or copy backbuffer and front buffer, but strictly that is
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// not true. technically backbuffer content is totally undefined after a swap
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// and thus you MUST re-render all of it, thus MODE_FULL
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swap_mode = MODE_FULL;
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// BUT... reality is that lmost every implementation copies or swaps so
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// triple buffer mode can be used as it is a superset of double buffer and
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// copy (though using those explicitly is more efficient). so let's play with
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// triple buffer mdoe as a default and see.
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// re->mode = MODE_TRIPLE;
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// XXX: note - the above seems to break on some older intel chipsets and
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// drivers. it seems we CANT depend on backbuffer staying around. bugger!
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switch (info_swap_mode)
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{
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case EVAS_ENGINE_GL_SWAP_MODE_FULL:
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swap_mode = MODE_FULL;
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break;
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case EVAS_ENGINE_GL_SWAP_MODE_COPY:
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swap_mode = MODE_COPY;
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break;
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case EVAS_ENGINE_GL_SWAP_MODE_DOUBLE:
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swap_mode = MODE_DOUBLE;
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break;
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case EVAS_ENGINE_GL_SWAP_MODE_TRIPLE:
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swap_mode = MODE_TRIPLE;
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break;
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case EVAS_ENGINE_GL_SWAP_MODE_QUADRUPLE:
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swap_mode = MODE_QUADRUPLE;
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break;
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default:
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swap_mode = MODE_AUTO;
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break;
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}
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}
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return swap_mode;
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}
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#endif
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