diff --git a/examples/basic.cpp b/examples/basic.cpp
index c1303e8..345439b 100644
--- a/examples/basic.cpp
+++ b/examples/basic.cpp
@@ -4,19 +4,27 @@ namespace
 {
 	void init()
 	{
-		glerminal_update_palette(0, 0xFF0000FF);
-		glerminal_update_palette(1, 0x00FF00FF);
+		glerminal_update_palette(0, 0x00000000);
+		glerminal_update_palette(1, 0xFF00001F);
+		glerminal_update_palette(2, 0x00FF001F);
 
-		glerminal_update_sprite(0, {
-			1, 1, 1, 1, 1, 1, 1, 1,
-			1, 0, 0, 0, 0, 0, 0, 0,
-			1, 0, 0, 0, 0, 0, 0, 0,
-			1, 0, 0, 0, 0, 0, 0, 0,
-			1, 0, 0, 0, 0, 0, 0, 0,
-			1, 0, 0, 0, 0, 0, 0, 0,
-			1, 0, 0, 0, 0, 0, 0, 0,
-			1, 0, 0, 0, 0, 0, 0, 0
+		glerminal_update_sprite(1, {
+			2, 2, 2, 2, 2, 2, 2, 2,
+			2, 1, 1, 1, 1, 1, 1, 2,
+			2, 1, 1, 1, 1, 1, 1, 2,
+			2, 1, 1, 1, 1, 1, 1, 2,
+			2, 1, 1, 1, 1, 1, 1, 2,
+			2, 1, 1, 1, 1, 1, 1, 2,
+			2, 1, 1, 1, 1, 1, 1, 2,
+			2, 2, 2, 2, 2, 2, 2, 2
 		});
+
+		glerminal_set(0, 0, 0, 1);
+		glerminal_set(1, 0, 0, 1);
+		glerminal_set(1, 0, 1, 1);
+		glerminal_set(2, 0, 0, 1);
+		glerminal_set(2, 0, 1, 1);
+		glerminal_set(2, 0, 2, 1);
 	}
 
 	void mainloop(float dt)
diff --git a/source/glerminal.cpp b/source/glerminal.cpp
index a416872..0c2cb56 100644
--- a/source/glerminal.cpp
+++ b/source/glerminal.cpp
@@ -25,18 +25,19 @@ namespace
 	constexpr char* VERTEX_SHADER_SOURCE =
 		"#version 400 core\n"
 		"layout (location = 0) in vec2 position;\n"
-		"layout (location = 1) in int sprite;\n"
+		"layout (location = 1) in ivec4 sprite[4];\n"
 		"uniform vec4 " SCREEN_SIZE_UNIFORM_NAME ";\n"
 		"out VS_OUT {\n"
-		"	flat int sprite;\n"
+		"	flat ivec4 sprite[4];\n"
 		"	vec2 texcoord;\n"
 		"} vs_out;\n"
 		"void main()\n"
 		"{\n"
 		"	vs_out.sprite = sprite;\n"
-		"	vs_out.texcoord = position + 1;\n"
+		"	vs_out.texcoord = vec2(position.x + 1, -position.y);\n"
 		"	vec2 cell_position = vec2(1 + gl_InstanceID - " SCREEN_SIZE_UNIFORM_NAME ".x * floor(gl_InstanceID * " SCREEN_SIZE_UNIFORM_NAME ".z), -floor((gl_InstanceID) * " SCREEN_SIZE_UNIFORM_NAME ".z));\n"
-		"	gl_Position = vec4((position + cell_position) * " SCREEN_SIZE_UNIFORM_NAME ".zw * 2 + vec2(-1, 1), 0, 1);\n"
+		"	vec2 temp = vec2((position + cell_position) * " SCREEN_SIZE_UNIFORM_NAME ".zw * 2 + vec2(-1, 1));\n"
+		"	gl_Position = vec4(temp.x, -temp.y, 0, 1);\n"
 		"}";
 
 	constexpr char* GEOMETRY_SHADER_SOURCE =
@@ -45,7 +46,7 @@ namespace
 		"layout (triangle_strip, max_vertices = 48) out;\n"
 		"layout (invocations = 16) in;\n"
 		"in VS_OUT {\n"
-		"	flat int sprite;\n"
+		"	flat ivec4 sprite[4];\n"
 		"	vec2 texcoord;\n"
 		"} gs_in[];\n"
 		"flat out int sprite;\n"
@@ -54,17 +55,17 @@ namespace
 		"{\n"
 		"	gl_Layer = gl_InvocationID;\n"
 		"	gl_Position = gl_in[0].gl_Position;\n"
-		"	sprite = gs_in[0].sprite;\n"
+		"	sprite = gs_in[0].sprite[gl_InvocationID / 16][gl_InvocationID % 16];\n"
 		"	texcoord = gs_in[0].texcoord;\n"
 		"	EmitVertex();\n"
 		"	gl_Layer = gl_InvocationID;\n"
 		"	gl_Position = gl_in[1].gl_Position;\n"
-		"	sprite = gs_in[1].sprite;\n"
+		"	sprite = gs_in[1].sprite[gl_InvocationID / 16][gl_InvocationID % 16];\n"
 		"	texcoord = gs_in[1].texcoord;\n"
 		"	EmitVertex();\n"
 		"	gl_Layer = gl_InvocationID;\n"
 		"	gl_Position = gl_in[2].gl_Position;\n"
-		"	sprite = gs_in[2].sprite;\n"
+		"	sprite = gs_in[2].sprite[gl_InvocationID / 16][gl_InvocationID % 16];\n"
 		"	texcoord = gs_in[2].texcoord;\n"
 		"	EmitVertex();\n"
 		"	EndPrimitive();\n"
@@ -100,10 +101,10 @@ namespace
 		"void main()\n"
 		"{\n"
 		"	vec3 current_color = vec3(0);\n"
-		"	for (int i = 15; i >= 0; i--)\n"
+		"	for (int i = 0; i < 16; i++)\n"
 		"	{\n"
 		"		vec4 texsample = texture(" LAYERS_UNIFORM_NAME ", vec3(texcoord, i));\n"
-		"		current_color = mix(current_color, texsample.xyz, texsample.w);\n"
+		"		current_color = mix(current_color, texsample.rgb, texsample.a);\n"
 		"	}\n"
 		"	FragColor = vec4(current_color, 1);\n"
 		"}";
@@ -195,7 +196,7 @@ namespace glerminal
 	{
 		if (x < GRID_WIDTH && y < GRID_HEIGHT && layer < LAYER_COUNT)
 		{
-			m_cells[x + y * GRID_WIDTH + layer * GRID_AREA] = sprite;
+			m_cells[layer + x * LAYER_COUNT + y * LAYER_COUNT * GRID_WIDTH] = sprite;
 		}
 	}
 
@@ -223,8 +224,8 @@ namespace glerminal
 		{
 			m_palette[4 * id + 0] = ((color >> 24) & 0xFF) / 255.0f;
 			m_palette[4 * id + 1] = ((color >> 16) & 0xFF) / 255.0f;
-			m_palette[4 * id + 2] = ((color >> 8) & 0xFF) / 255.0f;
-			m_palette[4 * id + 3] = ((color >> 0) & 0xFF) / 255.0f;
+			m_palette[4 * id + 2] = ((color >>  8) & 0xFF) / 255.0f;
+			m_palette[4 * id + 3] = ((color >>  0) & 0xFF) / 255.0f;
 		}
 	}
 
@@ -350,8 +351,17 @@ namespace glerminal
 		glBindBuffer(GL_ARRAY_BUFFER, m_instance_vbo);
 		glBufferData(GL_ARRAY_BUFFER, sizeof(m_cells), m_cells, GL_STREAM_DRAW);
 		glEnableVertexAttribArray(1);
-		glVertexAttribIPointer(1, 1, GL_UNSIGNED_BYTE, sizeof(*m_cells), reinterpret_cast<void*>(0));
+		glVertexAttribIPointer(1, 4, GL_UNSIGNED_BYTE, 16 * sizeof(*m_cells), reinterpret_cast<void*>(0));
 		glVertexAttribDivisor(1, 1);
+		glEnableVertexAttribArray(2);
+		glVertexAttribIPointer(2, 4, GL_UNSIGNED_BYTE, 16 * sizeof(*m_cells), reinterpret_cast<void*>(4));
+		glVertexAttribDivisor(2, 1);
+		glEnableVertexAttribArray(3);
+		glVertexAttribIPointer(3, 4, GL_UNSIGNED_BYTE, 16 * sizeof(*m_cells), reinterpret_cast<void*>(8));
+		glVertexAttribDivisor(3, 1);
+		glEnableVertexAttribArray(4);
+		glVertexAttribIPointer(4, 4, GL_UNSIGNED_BYTE, 16 * sizeof(*m_cells), reinterpret_cast<void*>(12));
+		glVertexAttribDivisor(4, 1);
 
 		// set up static vertex attributes
 		glGenVertexArrays(1, &m_screen_vao);