Build with -Wfloat-conversion + fix all warnings

src/render/opengl/SDL_render_gl.c

@@ -1047,8 +1047,8 @@ static int SetDrawState(GL_RenderData *data, const SDL_RenderCommand *cmd, const
                          viewport->w, viewport->h);
         if (viewport->w && viewport->h) {
             data->glOrtho((GLdouble)0, (GLdouble)viewport->w,
-                          (GLdouble)istarget ? 0 : viewport->h,
-                          (GLdouble)istarget ? viewport->h : 0,
+                          (GLdouble)(istarget ? 0 : viewport->h),
+                          (GLdouble)(istarget ? viewport->h : 0),
                           0.0, 1.0);
         }
         data->glMatrixMode(GL_MODELVIEW);

src/render/psp/SDL_render_psp.c

@@ -128,10 +128,8 @@ typedef struct
     float x, y, z;
 } VertTCV;
 
-#define PI 3.14159265358979f
-
-#define radToDeg(x) ((x)*180.f / PI)
-#define degToRad(x) ((x)*PI / 180.f)
+#define radToDeg(x) ((x)*180.f / SDL_PI_F)
+#define degToRad(x) ((x)*SDL_PI_F / 180.f)
 
 static float MathAbs(float x)
 {
@@ -809,7 +807,7 @@ static int PSP_QueueCopy(SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_Tex
         float curX = x;
         const float endX = x + width;
         const float slice = 64.0f;
-        const size_t count = SDL_ceilf(width / slice);
+        const size_t count = (size_t)SDL_ceilf(width / slice);
         size_t i;
         float ustep = (u1 - u0) / width * slice;
 
@@ -877,7 +875,7 @@ static int PSP_QueueCopyEx(SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_T
 
     cmd->data.draw.count = 1;
 
-    MathSincos(degToRad(360 - angle), &s, &c);
+    MathSincos(degToRad((float)(360 - angle)), &s, &c);
 
     cw1 = c * -centerx;
     sw1 = s * -centerx;

src/render/vitagxm/SDL_render_vita_gxm.c

@@ -838,8 +838,8 @@ static int SetDrawState(VITA_GXM_RenderData *data, const SDL_RenderCommand *cmd)
     if (data->drawstate.viewport_dirty) {
         const SDL_Rect *viewport = &data->drawstate.viewport;
 
-        float sw = viewport->w / 2.;
-        float sh = viewport->h / 2.;
+        float sw = viewport->w / 2.f;
+        float sh = viewport->h / 2.f;
 
         float x_scale = sw;
         float x_off = viewport->x + sw;