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Added the hint SDL_HINT_RENDER_LINE_METHOD to select the line rendering method

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This commit is contained in:
Sam Lantinga 2022-01-08 11:36:29 -08:00
parent 836a4ec7b1
commit 09ece861d1
3 changed files with 59 additions and 7 deletions
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42
src/render/SDL_render.c
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@ -896,6 +896,26 @@ void VerifyDrawQueueFunctions(const SDL_Renderer *renderer)
SDL_assert(renderer->RunCommandQueue != NULL);
}
static SDL_RenderLineMethod SDL_GetRenderLineMethod()
{
const char *hint = SDL_GetHint(SDL_HINT_RENDER_LINE_METHOD);
int method = 0;
if (hint) {
method = SDL_atoi(hint);
}
switch (method) {
case 1:
return SDL_RENDERLINEMETHOD_POINTS;
case 2:
return SDL_RENDERLINEMETHOD_LINES;
case 3:
return SDL_RENDERLINEMETHOD_GEOMETRY;
default:
return SDL_RENDERLINEMETHOD_POINTS;
}
}
SDL_Renderer *
SDL_CreateRenderer(SDL_Window * window, int index, Uint32 flags)
{
@ -1011,6 +1031,8 @@ SDL_CreateRenderer(SDL_Window * window, int index, Uint32 flags)
renderer->relative_scaling = SDL_GetHintBoolean(SDL_HINT_MOUSE_RELATIVE_SCALING, SDL_TRUE);
renderer->line_method = SDL_GetRenderLineMethod();
if (SDL_GetWindowFlags(window) & (SDL_WINDOW_HIDDEN|SDL_WINDOW_MINIMIZED)) {
renderer->hidden = SDL_TRUE;
} else {
@ -1062,6 +1084,9 @@ SDL_CreateSoftwareRenderer(SDL_Surface * surface)
/* new textures start at zero, so we start at 1 so first render doesn't flush by accident. */
renderer->render_command_generation = 1;
/* Software renderer always uses line method, for speed */
renderer->line_method = SDL_RENDERLINEMETHOD_LINES;
SDL_RenderSetViewport(renderer, NULL);
}
return renderer;
@ -2794,6 +2819,10 @@ static int plotLineLow(SDL_Renderer *renderer, float x0, float y0, float x1, flo
SDL_FPoint *points = SDL_small_alloc(SDL_FPoint, count, &isstack);
SDL_FPoint *tmp = points;
if (!points) {
return SDL_OutOfMemory();
}
if (dy < 0) {
yi = -1;
dy = -dy;
@ -2837,6 +2866,10 @@ static int plotLineHigh(SDL_Renderer *renderer, float x0, float y0, float x1, fl
SDL_FPoint *points = SDL_small_alloc(SDL_FPoint, count, &isstack);
SDL_FPoint *tmp = points;
if (!points) {
return SDL_OutOfMemory();
}
if (dx < 0) {
xi = -1;
dx = -dx;
@ -2999,8 +3032,6 @@ SDL_RenderDrawLinesF(SDL_Renderer * renderer,
const SDL_FPoint * points, int count)
{
int retval = 0;
int use_renderpoints;
int use_rendergeometry;
CHECK_RENDERER_MAGIC(renderer, -1);
@ -3018,12 +3049,9 @@ SDL_RenderDrawLinesF(SDL_Renderer * renderer,
}
#endif
use_renderpoints = 1;
use_rendergeometry = 1;
if (use_renderpoints) {
if (renderer->line_method == SDL_RENDERLINEMETHOD_POINTS) {
retval = RenderDrawLinesWithRectsF(renderer, points, count);
} else if (use_rendergeometry) {
} else if (renderer->line_method == SDL_RENDERLINEMETHOD_GEOMETRY) {
SDL_bool isstack1;
SDL_bool isstack2;
const float scale_x = renderer->scale.x;