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[Renderers/SDL3] Add borders and rounded borders functionality.

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arnau.nau 2025-01-23 04:07:26 +01:00
parent 04d82465e7
commit e08950c2c7
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GPG Key ID: 88BBBBA8921839B2
1 changed files with 91 additions and 14 deletions
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103
renderers/SDL3/clay_renderer_SDL3.c
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@ -6,13 +6,12 @@
/* This needs to be global because the "MeasureText" callback doesn't have a
* user data parameter */
static TTF_Font *gFonts[1];
/* Global for convenience. Even in 4K this is enough for smooth curves (low radius or rect size coupled with
* no AA or low resolution might make it appear as jagged curves) */
static int NUM_CIRCLE_SEGMENTS = 16;
//all rendering is performed by a single SDL call, avoiding multiple RenderRect + plumbing choice for circles.
static void SDL_RenderRoundedRect(SDL_Renderer *renderer, const SDL_FRect rect, const float cornerRadius, const Clay_Color _color) {
/* Even in 4K this is enough for smooth curves (low radius or rect size coupled with
* no AA or low resolution might make it appear as jagged curves) */
const int NUM_CIRCLE_SEGMENTS = 16;
static void SDL_RenderFillRoundedRect(SDL_Renderer *renderer, const SDL_FRect rect, const float cornerRadius, const Clay_Color _color) {
const SDL_FColor color = { _color.r/255, _color.g/255, _color.b/255, _color.a/255 };
int indexCount = 0, vertexCount = 0;
@ -20,8 +19,10 @@ static void SDL_RenderRoundedRect(SDL_Renderer *renderer, const SDL_FRect rect,
const float minRadius = SDL_min(rect.w, rect.h) / 2.0f;
const float clampedRadius = SDL_min(cornerRadius, minRadius);
int totalVertices = 4 + (4 * (NUM_CIRCLE_SEGMENTS * 2)) + 2*4;
int totalIndices = 6 + (4 * (NUM_CIRCLE_SEGMENTS * 3)) + 6*4;
const int numCircleSegments = SDL_max(NUM_CIRCLE_SEGMENTS, (int) clampedRadius * 0.5f);
int totalVertices = 4 + (4 * (numCircleSegments * 2)) + 2*4;
int totalIndices = 6 + (4 * (numCircleSegments * 3)) + 6*4;
SDL_Vertex vertices[totalVertices];
int indices[totalIndices];
@ -40,8 +41,8 @@ static void SDL_RenderRoundedRect(SDL_Renderer *renderer, const SDL_FRect rect,
indices[indexCount++] = 3;
//define rounded corners as triangle fans
const float step = (SDL_PI_F/2) / NUM_CIRCLE_SEGMENTS;
for (int i = 0; i < NUM_CIRCLE_SEGMENTS; i++) {
const float step = (SDL_PI_F/2) / numCircleSegments;
for (int i = 0; i < numCircleSegments; i++) {
const float angle1 = (float)i * step;
const float angle2 = ((float)i + 1.0f) * step;
@ -53,7 +54,7 @@ static void SDL_RenderRoundedRect(SDL_Renderer *renderer, const SDL_FRect rect,
case 1: cx = rect.x + rect.w - clampedRadius; cy = rect.y + clampedRadius; signX = 1; signY = -1; break; // Top-right
case 2: cx = rect.x + rect.w - clampedRadius; cy = rect.y + rect.h - clampedRadius; signX = 1; signY = 1; break; // Bottom-right
case 3: cx = rect.x + clampedRadius; cy = rect.y + rect.h - clampedRadius; signX = -1; signY = 1; break; // Bottom-left
default: SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Invalid corner index"); return;
default: return;
}
vertices[vertexCount++] = (SDL_Vertex){ {cx + SDL_cosf(angle1) * clampedRadius * signX, cy + SDL_sinf(angle1) * clampedRadius * signY}, color, {0, 0} };
@ -111,6 +112,26 @@ static void SDL_RenderRoundedRect(SDL_Renderer *renderer, const SDL_FRect rect,
SDL_RenderGeometry(renderer, NULL, vertices, vertexCount, indices, indexCount);
}
static void SDL_RenderArc(SDL_Renderer *renderer, const SDL_FPoint center, const float radius, const float startAngle, const float endAngle, const float thickness, const Clay_Color color) {
SDL_SetRenderDrawColor(renderer, color.r, color.g, color.b, color.a);
const float radStart = startAngle * (SDL_PI_F / 180.0f);
const float radEnd = endAngle * (SDL_PI_F / 180.0f);
const int numCircleSegments = SDL_max(NUM_CIRCLE_SEGMENTS, (int)(radius * 0.5f));
const float angleStep = (radEnd - radStart) / numCircleSegments;
const float halfThickness = thickness * 0.5f;
for (float t = -halfThickness; t < halfThickness-0.5f; t += 0.5f) {
SDL_FPoint points[numCircleSegments + 1];
for (int i = 0; i <= numCircleSegments; i++) {
const float angle = radStart + i * angleStep;
points[i] = (SDL_FPoint){ center.x + SDL_cosf(angle) * (radius + t), center.y + SDL_sinf(angle) * (radius + t) };
}
SDL_RenderLines(renderer, points, numCircleSegments + 1);
}
}
static void SDL_RenderClayCommands(SDL_Renderer *renderer, Clay_RenderCommandArray *rcommands)
{
@ -126,9 +147,7 @@ static void SDL_RenderClayCommands(SDL_Renderer *renderer, Clay_RenderCommandArr
SDL_SetRenderDrawColor(renderer, color.r, color.g, color.b, color.a);
if (config->cornerRadius.topLeft > 0) {
//const float radius = (config->cornerRadius.topLeft * 2) / (float)((bounding_box.width > bounding_box.height) ? bounding_box.height : bounding_box.width);
//SDL_RenderRoundedRect(renderer, rect, radius, color);
SDL_RenderRoundedRect(renderer, rect, config->cornerRadius.topLeft, color);
SDL_RenderFillRoundedRect(renderer, rect, config->cornerRadius.topLeft, color);
} else {
SDL_RenderFillRect(renderer, &rect);
}
@ -146,6 +165,64 @@ static void SDL_RenderClayCommands(SDL_Renderer *renderer, Clay_RenderCommandArr
SDL_DestroySurface(surface);
SDL_DestroyTexture(texture);
} break;
case CLAY_RENDER_COMMAND_TYPE_BORDER: {
const Clay_BorderElementConfig *config = rcmd->config.borderElementConfig;
const float minRadius = SDL_min(rect.w, rect.h) / 2.0f;
const Clay_CornerRadius clampedRadii = {
.topLeft = SDL_min(config->cornerRadius.topLeft, minRadius),
.topRight = SDL_min(config->cornerRadius.topRight, minRadius),
.bottomLeft = SDL_min(config->cornerRadius.bottomLeft, minRadius),
.bottomRight = SDL_min(config->cornerRadius.bottomRight, minRadius)
};
//edges
if (config->left.width > 0) {
const float starting_y = rect.y + (float)clampedRadii.topLeft;
const float length = rect.h - (float)clampedRadii.topLeft - (float)clampedRadii.bottomLeft;
SDL_FRect line = { rect.x, starting_y, config->left.width, length };
SDL_SetRenderDrawColor(renderer, config->left.color.r, config->left.color.g, config->left.color.b, config->left.color.a);
SDL_RenderFillRect(renderer, &line);
}
if (config->right.width > 0) {
const float starting_x = rect.x + rect.w - (float)config->right.width;
const float starting_y = rect.y + (float)clampedRadii.topRight;
const float length = rect.h - (float)clampedRadii.topRight - (float)clampedRadii.bottomRight;
SDL_FRect line = { starting_x, starting_y, config->right.width, length };
SDL_RenderFillRect(renderer, &line);
}
if (config->top.width > 0) {
const float starting_x = rect.x + (float)clampedRadii.topLeft;
const float length = rect.w - (float)clampedRadii.topLeft - (float)clampedRadii.topRight;
SDL_FRect line = { starting_x, rect.y, length, config->top.width };
SDL_RenderFillRect(renderer, &line);
}
if (config->bottom.width > 0) {
const float starting_x = rect.x + (float)clampedRadii.bottomLeft;
const float starting_y = rect.y + rect.h - (float)config->bottom.width;
const float length = rect.w - (float)clampedRadii.bottomLeft - (float)clampedRadii.bottomRight;
SDL_FRect line = { starting_x, starting_y, length, config->bottom.width };
SDL_SetRenderDrawColor(renderer, config->bottom.color.r, config->bottom.color.g, config->bottom.color.b, config->bottom.color.a);
SDL_RenderFillRect(renderer, &line);
}
//corners
if (config->cornerRadius.topLeft > 0) {
SDL_RenderArc(renderer, (SDL_FPoint){rect.x + clampedRadii.topLeft, rect.y + clampedRadii.topLeft},
clampedRadii.topLeft, 180.0f, 270.0f, config->top.width, config->top.color);
}
if (config->cornerRadius.topRight > 0) {
SDL_RenderArc(renderer, (SDL_FPoint){rect.x + rect.w - clampedRadii.topRight - config->right.width, rect.y + clampedRadii.topRight},
clampedRadii.topRight, 270.0f, 360.0f, config->top.width, config->top.color);
}
if (config->cornerRadius.bottomLeft > 0) {
SDL_RenderArc(renderer, (SDL_FPoint){rect.x + clampedRadii.bottomLeft, rect.y + rect.h - clampedRadii.bottomLeft - config->bottom.width},
clampedRadii.bottomLeft, 90.0f, 180.0f, config->bottom.width, config->bottom.color);
}
if (config->cornerRadius.bottomRight > 0) {
SDL_RenderArc(renderer, (SDL_FPoint){rect.x + rect.w - clampedRadii.bottomRight - config->left.width, rect.y + rect.h - clampedRadii.bottomRight - config->bottom.width},
clampedRadii.bottomRight, 0.0f, 90.0f, config->bottom.width, config->bottom.color);
}
} break;
default:
SDL_Log("Unknown render command type: %d", rcmd->commandType);
}