Rework sprite API

.gitattributes

@@ -0,0 +1 @@
+*.png filter=lfs diff=lfs merge=lfs -text

examples/CMakeLists.txt

@@ -2,20 +2,37 @@ cmake_minimum_required(VERSION 3.28)
 
 set(CMAKE_FOLDER examples)
 
-add_executable(basic WIN32
+file(GLOB_RECURSE
-	basic.cpp
+	EXAMPLE_RESOURCES
+	RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+	CONFIGURE_DEPENDS
+
+	${CMAKE_CURRENT_SOURCE_DIR}/resources/**.png
 )
 
-target_link_libraries(basic
+foreach(RESOURCE_FILE ${EXAMPLE_RESOURCES})
-	PRIVATE
+	add_custom_command(
-		glerminal
+		OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${RESOURCE_FILE}
+		COMMAND ${CMAKE_COMMAND} -E copy
+			${CMAKE_CURRENT_SOURCE_DIR}/${RESOURCE_FILE}
+			${CMAKE_CURRENT_BINARY_DIR}/${RESOURCE_FILE}
+		DEPENDS
+			${CMAKE_CURRENT_SOURCE_DIR}/${RESOURCE_FILE}
+	)
+endforeach()
+
+file(GLOB_RECURSE
+	EXAMPLE_SOURCES
+	RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+	CONFIGURE_DEPENDS
+
+	${CMAKE_CURRENT_SOURCE_DIR}/*.cpp
 )
 
-add_executable(towers WIN32
+list(TRANSFORM EXAMPLE_RESOURCES PREPEND ${CMAKE_CURRENT_BINARY_DIR}/)
-	towers.cpp
-)
 
-target_link_libraries(towers
+foreach(SOURCE_FILE ${EXAMPLE_SOURCES})
-	PRIVATE
+	get_filename_component(SOURCE_FILENAME ${SOURCE_FILE} NAME_WLE)
-		glerminal
+	add_executable(${SOURCE_FILENAME} WIN32 ${SOURCE_FILE} ${EXAMPLE_RESOURCES})
-)
+	target_link_libraries(${SOURCE_FILENAME} PRIVATE glerminal)
+endforeach()

examples/atlas.cpp

@@ -0,0 +1,46 @@
+#include <glerminal.h>
+
+#include <cstdlib>
+
+namespace
+{
+	void init()
+	{
+		glerminal_load_sprites_file("resources/atlas.png");
+	}
+
+	void mainloop(float dt)
+	{
+		static float time = 1;
+
+		time += dt;
+
+		if (time < 1.0f)
+		{
+			return;
+		}
+		else
+		{
+			time = 0;
+		}
+
+		for (int i = 0; i < 40; i++)
+		{
+			for (int j = 0; j < 25; j++)
+			{
+				for (int k = 0; k < 256; k++)
+				{
+					glerminal_set(i, j, k, rand() % 4);
+					glerminal_offset(i, j, k, (rand() * rand()) % 64 - 32, (rand() * rand()) % 64 - 32);
+				}
+			}
+		}
+
+		glerminal_flush();
+	}
+}
+
+int main(int argc, char** argv)
+{
+	glerminal_run(init, mainloop);
+}

examples/basic.cpp

@@ -6,16 +6,7 @@ namespace
 {
 	void init()
 	{
-		glerminal_update_sprite(1, {
+		glerminal_load_sprites_file("resources/basic.png");
-			0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00,
-			0x5000FF00, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x5000FF00,
-			0x5000FF00, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x5000FF00,
-			0x5000FF00, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x5000FF00,
-			0x5000FF00, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x5000FF00,
-			0x5000FF00, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x5000FF00,
-			0x5000FF00, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x500000FF, 0x5000FF00,
-			0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00, 0x5000FF00
-		});
 	}
 
 	void mainloop(float dt)
@@ -39,7 +30,7 @@ namespace
 			{
 				for (int k = 0; k < 256; k++)
 				{
-					glerminal_set(i, j, k, rand() % 8 == 0);
+					glerminal_set(i, j, k, rand() % 3 == 0);
 					glerminal_offset(i, j, k, (rand() * rand()) % 64 - 32, (rand() * rand()) % 64 - 32);
 				}
 			}

examples/resources/atlas.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:93d9f6545bb2dc2dbb1fcc72875e104e7fa2bbeca6972dc133865dcfbf66e720
+size 120

examples/resources/basic.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:56e82b6fd40c3d880d1683d59a6a52f5e7b188d199aed22f375189eb1735e3a2
+size 120

examples/resources/towers.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:aba7635b3d53c74c5b177ddb02641a475664acc86344f884d350e61737d0f1ec
+size 98

examples/towers.cpp

@@ -7,64 +7,48 @@ namespace
 {
 	void init()
 	{
-		glerminal_update_sprite(1,
+		glerminal_load_sprites_file("resources/towers.png");
-			{
-				0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
-				0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
-				0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
-				0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
-				0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
-				0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
-				0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
-				0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
-			});
 
 		for (int i = 0; i < 256; i++)
 		{
-			constexpr unsigned char c = 32;
+			constexpr unsigned char c = 0;
 			const unsigned char v = (255 - c) * powf((i - 1) / 256.0f, 2.0f) + c;
-			const unsigned int j = (0xFF << 24) | (v << 16) | (v << 8) | v;
+			const unsigned int j = (0x7F << 24) | (v << 16) | (v << 8) | v;
 			glerminal_layer_color(i, j);
 			glerminal_layer_scale(i, i / 256.0f + 1);
 		}
-	}
-
-	void mainloop(float dt)
-	{
-		static float time = 1;
-
-		time += dt;
-
-		if (time < 0.15f)
-		{
-			return;
-		}
-		else
-		{
-			time = 0;
-		}
-
-		const int cx = rand() % 40;
-		const int cy = rand() % 25;
 
 		for (int i = 0; i < 40; i++)
 		{
 			for (int j = 0; j < 25; j++)
 			{
 				const int c = rand() % 224 + 32;
+				for (int k = 0; k < c; k++)
+				{
+					glerminal_set(i, j, k, 1);
+				}
+			}
+		}
+	}
+
+	void mainloop(float dt)
+	{
+		static float time = 0;
+
+		time += dt;
+
+		const float cx = 20.0f * cosf(time / 3.1415f) + 20.0f;
+		const float cy = 12.5f * sinf(time / 3.1415f) + 12.5f;
+
+		for (int i = 0; i < 40; i++)
+		{
+			for (int j = 0; j < 25; j++)
+			{
 				for (int k = 0; k < 256; k++)
 				{
-					if (k < c)
+					const float ox = 0.01f * k * (i - cx);
-					{
+					const float oy = 0.01f * k * (j - cy);
-						glerminal_set(i, j, k, 1);
+					glerminal_offset(i, j, k, ox + (1 + 0.004f * k) * cosf(i + k * 6.2832f / 128.0f + 3.1415f * time), oy + (1 + 0.004f * k) * sinf(j + k * 6.2832f / 128.0f + 3.1415f * time));
-						const float ox = 0.01f * k * (i - cx);
-						const float oy = 0.01f * k * (j - cy);
-						glerminal_offset(i, j, k, ox + (1 + 0.004f * k) * cosf(c * i + k * 6.28f / 128.0f), oy + (1 + 0.004f * k) * sinf(c * j + k * 6.28f / 128.0f));
-					}
-					else
-					{
-						glerminal_set(i, j, k, 0);
-					}
 				}
 			}
 		}

include/glerminal.h

@@ -6,20 +6,9 @@ extern "C"
 {
 #endif
 
-enum
-{
-	GLERMINAL_CELL_SIZE = 8,
-	GLERMINAL_CELL_AREA = GLERMINAL_CELL_SIZE * GLERMINAL_CELL_SIZE
-};
-
 typedef void (*glerminal_init_cb)();
 typedef void (*glerminal_main_cb)(float dt);
 
-typedef struct glerminal_sprite
-{
-	unsigned int data[GLERMINAL_CELL_AREA];
-} glerminal_sprite;
-
 /**
  * @brief Call init once, then run the application's mainloop
  * @param init initialization callback
@@ -71,12 +60,9 @@ void glerminal_layer_color(unsigned char layer, unsigned int color);
  */
 void glerminal_layer_scale(unsigned char layer, float scale);
 
-/**
+void glerminal_load_sprites_file(const char* filename);
- * @brief Upload sprite to the given sprite ID
+
- * @param id The ID of the sprite to change
+void glerminal_load_sprites_buffer(unsigned char width, unsigned char height, const unsigned int* buffer);
- * @param sprite The new sprite
- */
-void glerminal_update_sprite(unsigned char id, glerminal_sprite sprite);
 
 #ifdef __cplusplus
 }

source/glerminal-private.h

@@ -3,24 +3,23 @@
 
 #include "glerminal.h"
 
+#include <stb_image.h>
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
 
-#include <stdexcept>
-#ifdef _DEBUG
 #include <fstream>
-#endif
+#include <stdexcept>
 
 namespace glerminal
 {
 	constexpr unsigned int SCREEN_WIDTH = 1280;
 	constexpr unsigned int SCREEN_HEIGHT = 800;
-	constexpr unsigned int CELL_SIZE = GLERMINAL_CELL_SIZE;
+	constexpr unsigned int CELL_SIZE = 8;
 	constexpr unsigned int CELL_SCALE = 4;
+	constexpr unsigned int LAYER_COUNT = 256;
 	constexpr unsigned int GRID_WIDTH = SCREEN_WIDTH / (CELL_SIZE * CELL_SCALE);
 	constexpr unsigned int GRID_HEIGHT = SCREEN_HEIGHT / (CELL_SIZE * CELL_SCALE);
 	constexpr unsigned int GRID_AREA = GRID_WIDTH * GRID_HEIGHT;
-	constexpr unsigned int LAYER_COUNT = 256;
 
 	class glerminal
 	{
@@ -43,8 +42,7 @@ namespace glerminal
 		void offset(unsigned char x, unsigned char y, unsigned char layer, float x_offset, float y_offset);
 		void layer_color(unsigned char layer, unsigned int color);
 		void layer_scale(unsigned char layer, float scale);
-
+		void load_atlas(unsigned char w, unsigned char h, const unsigned int* data);
-		void update_sprite(unsigned char id, glerminal_sprite sprite);
 
 	private:
 		// glfw data

source/glerminal.cpp

@@ -1,3 +1,6 @@
+#define STB_IMAGE_IMPLEMENTATION
+#define STBI_ONLY_PNG
+#define STBI_MAX_DIMENSIONS 128
 #include "glerminal-private.h"
 
 #define GRID_SIZE_UNIFORM_NAME "grid_size"
@@ -255,10 +258,26 @@ namespace glerminal
 		m_layer_scales[layer] = scale;
 	}
 
-	void glerminal::update_sprite(unsigned char id, glerminal_sprite sprite)
+	void glerminal::load_atlas(unsigned char w, unsigned char h, const unsigned int* data)
 	{
-		// does this work?
+		// each row of the atlas
-		reinterpret_cast<glerminal_sprite*>(m_sprites)[id] = sprite;
+		for (int j = 0; j < h; j++)
+		{
+			// each column of the atlas
+			for (int i = 0; i < w; i++)
+			{
+				// each row of the individual sprite
+				for (int k = 0; k < CELL_SIZE; k++)
+				{
+					// offset from base address in atlas layout
+					const unsigned int src_offset = i + k * w + j * w * CELL_SIZE;
+					// offset from base address in array layout
+					const unsigned int dst_offset = k + i * CELL_SIZE + j * w * CELL_SIZE;
+
+					memcpy(m_sprites + CELL_SIZE * dst_offset, data + CELL_SIZE * src_offset, CELL_SIZE * sizeof(unsigned int));
+				}
+			}
+		}
 	}
 
 	void glerminal::init_glfw()
@@ -682,9 +701,29 @@ void glerminal_layer_scale(unsigned char layer, float scale)
 	GLERMINAL_G->layer_scale(layer, scale);
 }
 
-void glerminal_update_sprite(unsigned char id, glerminal_sprite sprite)
+void glerminal_load_sprites_file(const char* filename)
 {
 	if (!GLERMINAL_G) { return; }
 
-	GLERMINAL_G->update_sprite(id, sprite);
+	int w, h;
+	stbi_uc* const buffer = stbi_load(filename, &w, &h, nullptr, 4);
+
+	// verify atlas size is a multiple of CELL_SIZE in each dimension
+	if (w % glerminal::CELL_SIZE == 0 && h % glerminal::CELL_SIZE == 0)
+	{
+		GLERMINAL_G->load_atlas(w / glerminal::CELL_SIZE, h / glerminal::CELL_SIZE, reinterpret_cast<unsigned int*>(buffer));
+	}
+
+	stbi_image_free(buffer);
+}
+
+void glerminal_load_sprites_buffer(unsigned char width, unsigned char height, const unsigned int* buffer)
+{
+	if (!GLERMINAL_G) { return; }
+
+	// verify atlas size is a multiple of CELL_SIZE in each dimension
+	if (width % glerminal::CELL_SIZE == 0 && height % glerminal::CELL_SIZE == 0)
+	{
+		GLERMINAL_G->load_atlas(width / glerminal::CELL_SIZE, height / glerminal::CELL_SIZE, buffer);
+	}
 }