add initial implementation of terminal renderer

CMakeLists.txt

@@ -8,4 +8,5 @@ if(NOT MSVC)
   add_subdirectory("examples/raylib-sidebar-scrolling-container")
   add_subdirectory("examples/cairo-pdf-rendering")
   add_subdirectory("examples/clay-official-website")
+  add_subdirectory("examples/terminal-example")
 endif()

examples/terminal-example/CMakeLists.txt

@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 3.27)
+project(clay_examples_terminal C)
+set(CMAKE_C_STANDARD 99)
+
+add_executable(clay_examples_terminal main.c)
+
+target_compile_options(clay_examples_terminal PUBLIC)
+target_include_directories(clay_examples_terminal PUBLIC .)
+
+target_link_libraries(clay_examples_terminal PUBLIC ${CURSES_LIBRARY})
+set(CMAKE_CXX_FLAGS_DEBUG "-Wall -Werror -DCLAY_DEBUG")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3")

examples/terminal-example/main.c

@@ -0,0 +1,54 @@
+// Must be defined in one file, _before_ #include "clay.h"
+#define CLAY_IMPLEMENTATION
+
+#include <unistd.h>
+#include "../../clay.h"
+#include "../../renderers/terminal/clay_renderer_terminal.c"
+
+const Clay_Color COLOR_LIGHT = (Clay_Color) {224, 215, 210, 255};
+const Clay_Color COLOR_RED = (Clay_Color) {168, 66, 28, 255};
+const Clay_Color COLOR_ORANGE = (Clay_Color) {225, 138, 50, 255};
+
+// An example function to begin the "root" of your layout tree
+Clay_RenderCommandArray CreateLayout() {
+	Clay_BeginLayout();
+
+	CLAY(CLAY_ID("OuterContainer"),
+	     CLAY_LAYOUT({.layoutDirection = CLAY_LEFT_TO_RIGHT, .sizing = {CLAY_SIZING_GROW(), CLAY_SIZING_GROW()}, }),
+	     CLAY_RECTANGLE({ .color = {0,0,0,255} })) {
+		CLAY(CLAY_ID("SideBar"),
+		     CLAY_LAYOUT({.layoutDirection = CLAY_TOP_TO_BOTTOM, .sizing = {.width = CLAY_SIZING_PERCENT(
+			     0.5), .height = CLAY_SIZING_PERCENT(1)}}),
+		     CLAY_RECTANGLE({.color = (Clay_Color) {255, 255, 255, 255}})
+		) {
+		}
+		CLAY(CLAY_ID("OtherSideBar"),
+		     CLAY_LAYOUT({.layoutDirection = CLAY_TOP_TO_BOTTOM, .sizing = {.width = CLAY_SIZING_PERCENT(
+			     0.5), .height = CLAY_SIZING_PERCENT(1)}}),
+		     CLAY_RECTANGLE({ .color = {0,0, 0, 255 }})
+		) {
+			// TODO font size is wrong, only one is allowed, but I don't know which it is
+			CLAY_TEXT(CLAY_STRING("0123456789 0123456 78901 234567 89012 34567 8901234567890 123456789"),
+			          CLAY_TEXT_CONFIG({ .fontId = 0, .fontSize = 24, .textColor = {255,255,255,255} }));
+		}
+	}
+
+	return Clay_EndLayout();
+}
+
+int main() {
+	uint64_t totalMemorySize = Clay_MinMemorySize();
+	Clay_Arena arena = Clay_CreateArenaWithCapacityAndMemory(totalMemorySize, malloc(totalMemorySize));
+	Clay_Initialize(arena, (Clay_Dimensions) { .width = 80, .height = 24 }); // TODO this is wrong, but I have no idea what the actual size of the terminal is in pixels
+	// Tell clay how to measure text
+	Clay_SetMeasureTextFunction(Console_MeasureText);
+
+	while(true) {
+		Clay_RenderCommandArray layout = CreateLayout();
+
+		Clay_Console_Render(layout);
+
+		fflush(stdout);
+		sleep(1);
+	}
+}

renderers/terminal/clay_renderer_terminal.c

@@ -0,0 +1,130 @@
+#include "stdint.h"
+#include "string.h"
+#include "stdio.h"
+#include "stdlib.h"
+#include "math.h"
+#ifdef CLAY_OVERFLOW_TRAP
+#include "signal.h"
+#endif
+
+#define gotoxy(x, y) printf("\033[%d;%dH", y+1, x+1)
+
+static inline void Console_DrawRectangle(int x0, int y0, int width, int height, Clay_Color color) {
+	if (color.r < 127 || color.g < 127 || color.b < 127 || color.a < 127) {
+		// For now there are only two colors,
+		return;
+	}
+
+	for (int y = y0; y < height; y++) {
+		for (int x = x0; x < width; x++) {
+			gotoxy(x, y);
+			// TODO there are only two colors actually drawn, the background and white
+			if (color.r < 127 || color.g < 127 || color.b < 127 || color.a < 127) {
+				printf(" ");
+			} else {
+				printf("▪");
+			}
+		}
+	}
+}
+
+static inline Clay_Dimensions Console_MeasureText(Clay_String *text, Clay_TextElementConfig *config) {
+	Clay_Dimensions textSize = { 0 };
+
+	// TODO this function is very wrong, it measures in characters, I have no idea what is the size in pixels
+
+	float maxTextWidth = 0.0f;
+	float lineTextWidth = 0;
+
+	float textHeight = 1;
+
+	for (int i = 0; i < text->length; ++i)
+	{
+		if (text->chars[i] == '\n') {
+			maxTextWidth = maxTextWidth > lineTextWidth ? maxTextWidth : lineTextWidth;
+			lineTextWidth = 0;
+			textHeight++;
+			continue;
+		}
+		lineTextWidth++;
+	}
+
+	maxTextWidth = maxTextWidth > lineTextWidth ? maxTextWidth : lineTextWidth;
+
+	textSize.width = maxTextWidth;
+	textSize.height = textHeight;
+
+	return textSize;
+}
+
+void Clay_Raylib_Initialize(int width, int height, const char *title, unsigned int flags) {
+	//TODO
+}
+
+void Clay_Console_Render(Clay_RenderCommandArray renderCommands)
+{
+	printf("\033[H\033[J"); // Clear
+
+	for (int j = 0; j < renderCommands.length; j++)
+	{
+		Clay_RenderCommand *renderCommand = Clay_RenderCommandArray_Get(&renderCommands, j);
+		Clay_BoundingBox boundingBox = renderCommand->boundingBox;
+		switch (renderCommand->commandType)
+		{
+			case CLAY_RENDER_COMMAND_TYPE_TEXT: {
+				Clay_String text = renderCommand->text;
+				int k = 0;
+				for (int i = 0; i < text.length; i++) {
+					if(text.chars[i] == '\n') {
+						k++;
+						continue;
+					}
+
+					gotoxy((int) boundingBox.x + i, (int) boundingBox.y + k);
+					printf("%c", text.chars[i]);
+				}
+				break;
+			}
+			case CLAY_RENDER_COMMAND_TYPE_SCISSOR_START: {
+				//TODO
+				break;
+			}
+			case CLAY_RENDER_COMMAND_TYPE_SCISSOR_END: {
+				//TODO
+				break;
+			}
+			case CLAY_RENDER_COMMAND_TYPE_RECTANGLE: {
+				Clay_RectangleElementConfig *config = renderCommand->config.rectangleElementConfig;
+				Console_DrawRectangle((int)boundingBox.x, (int)boundingBox.y, (int)boundingBox.width, (int)boundingBox.height, config->color);
+				break;
+			}
+			case CLAY_RENDER_COMMAND_TYPE_BORDER: {
+				Clay_BorderElementConfig *config = renderCommand->config.borderElementConfig;
+				// Left border
+				if (config->left.width > 0) {
+					Console_DrawRectangle((int)(boundingBox.x), (int)(boundingBox.y + config->cornerRadius.topLeft), (int)config->left.width, (int)(boundingBox.height - config->cornerRadius.topLeft - config->cornerRadius.bottomLeft), config->left.color);
+				}
+				// Right border
+				if (config->right.width > 0) {
+					Console_DrawRectangle((int)(boundingBox.x + boundingBox.width - config->right.width), (int)(boundingBox.y + config->cornerRadius.topRight), (int)config->right.width, (int)(boundingBox.height - config->cornerRadius.topRight - config->cornerRadius.bottomRight), config->right.color);
+				}
+				// Top border
+				if (config->top.width > 0) {
+					Console_DrawRectangle((int)(boundingBox.x + config->cornerRadius.topLeft), (int)(boundingBox.y), (int)(boundingBox.width - config->cornerRadius.topLeft - config->cornerRadius.topRight), (int)config->top.width, config->top.color);
+				}
+				// Bottom border
+				if (config->bottom.width > 0) {
+					Console_DrawRectangle((int)(boundingBox.x + config->cornerRadius.bottomLeft), (int)(boundingBox.y + boundingBox.height - config->bottom.width), (int)(boundingBox.width - config->cornerRadius.bottomLeft - config->cornerRadius.bottomRight), (int)config->bottom.width, config->bottom.color);
+				}
+				break;
+			}
+			default: {
+				printf("Error: unhandled render command.");
+#ifdef CLAY_OVERFLOW_TRAP
+				raise(SIGTRAP);
+#endif
+				exit(1);
+			}
+		}
+	}
+}