openGL desktop: error: conflicting declaration 'typedef float GLdouble'

[milahu]

im trying to compile MonkVG with openGL desktop

on openGL desktop, GLdouble == double on openGL mobile, GLdouble == float

(at least thats what i guess ...)

when i replace

sed -i 's|typedef float GLdouble;|typedef double GLdouble;|' glu/include/glu.h

then i hit another bug

in https://github.com/micahpearlman/MonkVG/blob/master/glu/libutil/project.c

    float in[4];
    float out[4];

should be

    GLdouble in[4];
    GLdouble out[4];

etc ...

more candidates

$ ~/bin/_rgrep -E '(^|[^a-zA-Z])float [a-zA-Z0-9]+\[(4|16)\]' 
./glu/libutil/project.c:249:    float in[4];
./glu/libutil/project.c:250:    float out[4];
./glu/libutil/project.c:284:    float finalMatrix[16];
./glu/libutil/project.c:285:    float in[4];
./glu/libutil/project.c:286:    float out[4];
./glu/libutil/project.c:325:    float finalMatrix[16];
./glu/libutil/project.c:326:    float in[4];
./glu/libutil/project.c:327:    float out[4];
./projects/MonkVG-Test-Quartz/tiger/test.c:6:static float overcolor[4] = {0,0,0,1};
./projects/MonkVG-Test-Quartz/tiger/main.c:132:         float color[4];
./projects/MonkVG-Test-Quartz/tiger/main.c:308:         float clearColor[4] = {1,1,1,1};
./projects/MonkVG-Test-iOS-OpenGL/tiger/test.c:6:static float overcolor[4] = {0,0,0,1};
./src/opengl/glPath.cpp:50:     void printMat44( float m[4][4] ) {
./src/opengl/glPaint.cpp:113:                           float finalcolor[4];
./src/opengl/glPaint.cpp:244:                           float finalcolor[4];
./src/opengl/glPaint.cpp:396:                           float finalcolor[4];
./src/opengl/glPaint.cpp:547:                           float finalcolor[4];

fix

sed -i -E 's,(^|[^a-zA-Z])float ([a-zA-Z0-9]+\[(4|16)\]),\1GLdouble \2,' glu/libutil/project.c

next problem: conflict in function type

 GLint GLAPIENTRY
 gluUnProject4(
     GLdouble winx, GLdouble winy, GLdouble winz, GLdouble clipw,
     const GLdouble modelMatrix[16], const GLdouble projMatrix[16], const GLint viewport[4],
-    GLclampd nearVal, GLclampd farVal,
+    GLdouble nearVal, GLdouble farVal,
     GLdouble *objx, GLdouble *objy, GLdouble *objz, GLdouble *objw
 )

fix

sed -i -E 's,GLclampd (nearVal|farVal),GLdouble \1,g' glu/libutil/project.c

not sure how to solve this for both desktop and mobile ...

now monkvg compiles : )

[micahpearlman]

In the olden days when I first implemented MonkVG for the original first versions of the iPhone & Android there was a significant performance hit using doubles over floats. Assuming this isn't an issue with modern hardware. shrug

[milahu]

there was a significant performance hit using doubles over floats

still should be ... gpu are optimized for float, except nvidia quadro, etc