vo_opengl: rename tone-mapping=simple to reinhard

This is the canonical name for the algorithm. I simply didn't know it
before.

DOCS/man/vo.rst

@@ -1071,9 +1071,9 @@ Available video output drivers are:
 
         clip
             Hard-clip any out-of-range values (default)
-        simple
-            Very simple continuous curve. Preserves dynamic range and peak but
-            uses nonlinear contrast.
+        reinhard
+            Reinhard tone mapping algorithm. Very simple continuous curve.
+            Preserves dynamic range and peak but uses nonlinear contrast.
         gamma
             Fits a logarithmic transfer between the tone curves.
         linear
@@ -1084,7 +1084,7 @@ Available video output drivers are:
         Set tone mapping parameters. Ignored if the tone mapping algorithm is
         not tunable. This affects the following tone mapping algorithms:
 
-        simple
+        reinhard
             Specifies the local contrast coefficient at the display peak.
             Defaults to 0.5, which means that in-gamut values will be about
             half as bright as when clipping.

video/out/opengl/video.c

@@ -383,10 +383,10 @@ const struct m_sub_options gl_video_conf = {
         OPT_CHOICE_C("target-trc", target_trc, 0, mp_csp_trc_names),
         OPT_INTRANGE("target-brightness", target_brightness, 0, 1, 100000),
         OPT_CHOICE("hdr-tone-mapping", hdr_tone_mapping, 0,
-                   ({"clip",   TONE_MAPPING_CLIP},
-                    {"simple", TONE_MAPPING_SIMPLE},
-                    {"gamma",  TONE_MAPPING_GAMMA},
-                    {"linear", TONE_MAPPING_LINEAR})),
+                   ({"clip",     TONE_MAPPING_CLIP},
+                    {"reinhard", TONE_MAPPING_REINHARD},
+                    {"gamma",    TONE_MAPPING_GAMMA},
+                    {"linear",   TONE_MAPPING_LINEAR})),
         OPT_FLOAT("tone-mapping-param", tone_mapping_param, 0),
         OPT_FLAG("pbo", pbo, 0),
         SCALER_OPTS("scale",  SCALER_SCALE),

video/out/opengl/video.h

@@ -105,7 +105,7 @@ enum prescalers {
 
 enum tone_mapping {
     TONE_MAPPING_CLIP,
-    TONE_MAPPING_SIMPLE,
+    TONE_MAPPING_REINHARD,
     TONE_MAPPING_GAMMA,
     TONE_MAPPING_LINEAR,
 };

video/out/opengl/video_shaders.c

@@ -327,7 +327,7 @@ void pass_tone_map(struct gl_shader_cache *sc, float peak_src, float peak_dst,
         GLSL(color.rgb = clamp(color.rgb, 0.0, 1.0);)
         break;
 
-    case TONE_MAPPING_SIMPLE: {
+    case TONE_MAPPING_REINHARD: {
         float contrast = isnan(param) ? 0.5 : param,
               offset = (1.0 - contrast) / contrast;
         GLSLF("color.rgb = color.rgb / (color.rgb + vec3(%f));\n", offset);