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[client] splash: pre-calculate & cache the radial gradient vectors

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This commit is contained in:
Geoffrey McRae 2022-05-27 10:23:10 +10:00
parent 1770defea2
commit 1e660fb7e1
1 changed files with 37 additions and 24 deletions
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61
client/src/overlay/splash.c
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@ -24,40 +24,39 @@
#include "../overlays.h" #include "../overlays.h"
#include "../main.h" #include "../main.h"
#include "overlay_utils.h" #include "overlay_utils.h"
#include "common/array.h"
#include "resources/lg-logo.svg.h" #include "resources/lg-logo.svg.h"
#include <math.h> #include <math.h>
#include <GL/gl.h> #include <GL/gl.h>
#define SEGMENTS 12
static bool l_show; static bool l_show;
static bool l_fadeDone; static bool l_fadeDone;
static float l_alpha; static float l_alpha;
static OverlayImage l_logo; static OverlayImage l_logo;
static float l_vectors[SEGMENTS][2];
static bool splash_init(void ** udata, const void * params) static void calcRadialVectors(float vectors[][2], int segments)
{ {
l_show = true; for (unsigned int i = 0; i < segments; ++i)
l_fadeDone = false; {
l_alpha = 1.0f; float angle = (i / (float)(segments - 1)) * M_PI * 2.0f;
vectors[i][0] = cos(angle);
overlayLoadSVG(b_lg_logo_svg, b_lg_logo_svg_size, &l_logo, 200, 200); vectors[i][1] = sin(angle);
}
return true;
}
static void splash_free(void * udata)
{
overlayFreeImage(&l_logo);
} }
static void drawRadialGradient(ImDrawList * list, int x, int y, int w, int h, static void drawRadialGradient(ImDrawList * list, int x, int y, int w, int h,
int steps, ImU32 innerColor, ImU32 outerColor) ImU32 innerColor, ImU32 outerColor,
float vectors[0][2], int segments)
{ {
const ImVec2 uv = list->_Data->TexUvWhitePixel; const ImVec2 uv = list->_Data->TexUvWhitePixel;
ImDrawList_PrimReserve(list, steps * 3, steps + 2); ImDrawList_PrimReserve(list, (segments - 1) * 3, segments + 1);
for(int i = 0; i < steps; ++i) for(int i = 0; i < segments - 1; ++i)
{ {
ImDrawList_PrimWriteIdx(list, list->_VtxCurrentIdx); ImDrawList_PrimWriteIdx(list, list->_VtxCurrentIdx);
ImDrawList_PrimWriteIdx(list, list->_VtxCurrentIdx + i + 1); ImDrawList_PrimWriteIdx(list, list->_VtxCurrentIdx + i + 1);
@ -69,17 +68,30 @@ static void drawRadialGradient(ImDrawList * list, int x, int y, int w, int h,
uv, uv,
innerColor); innerColor);
for (unsigned int i = 0; i < steps + 1; ++i) for (unsigned int i = 0; i < segments; ++i)
{
float angle = (i / (float)steps) * M_PI * 2.0f;
ImDrawList_PrimWriteVtx(list, ImDrawList_PrimWriteVtx(list,
(ImVec2){ (ImVec2){
x + cos(angle) * w, x + vectors[i][0] * w,
y + sin(angle) * h y + vectors[i][1] * h
}, },
uv, uv,
outerColor); outerColor);
} }
static bool splash_init(void ** udata, const void * params)
{
l_show = true;
l_fadeDone = false;
l_alpha = 1.0f;
overlayLoadSVG(b_lg_logo_svg, b_lg_logo_svg_size, &l_logo, 200, 200);
calcRadialVectors(l_vectors, ARRAY_LENGTH(l_vectors));
return true;
}
static void splash_free(void * udata)
{
overlayFreeImage(&l_logo);
} }
static int splash_render(void * udata, bool interactive, struct Rect * windowRects, static int splash_render(void * udata, bool interactive, struct Rect * windowRects,
@ -116,9 +128,10 @@ static int splash_render(void * udata, bool interactive, struct Rect * windowRec
drawRadialGradient(list, drawRadialGradient(list,
screen->x / 2, screen->y / 2, screen->x / 2, screen->y / 2,
screen->x , screen->y , screen->x , screen->y ,
12,
innerColor, innerColor,
outerColor); outerColor,
l_vectors,
ARRAY_LENGTH(l_vectors));
ImDrawList_AddImage( ImDrawList_AddImage(
list, list,