Adds a vulkan triangle example

Uses xcb as WSI with minimum integration (resize, fullscreen, etc).

.gitignore

@@ -3,3 +3,4 @@ frag.spv
 
 render-nodes-minimal/render-nodes-minimal
 vulkan-minimal/vulkan-minimal
+vulkan-triangle/vulkan-triangle

Makefile

@@ -1,7 +1,9 @@
 all: Makefile
 	make -C render-nodes-minimal all
 	make -C vulkan-minimal all
+	make -C vulkan-triangle all
 
 clean:
 	make -C render-nodes-minimal clean
 	make -C vulkan-minimal clean
+	make -C vulkan-triangle clean

vulkan-triangle/Makefile

@@ -0,0 +1,26 @@
+TARGET=vulkan-triangle
+
+GLSL_VALIDATOR=../glslangValidator
+
+VULKAN_SO_NAME=vulkan_intel
+VULKAN_SO_PATH=~/devel/build/lib
+
+all: Makefile $(TARGET) vert.spv frag.spv
+
+vert.spv: shader.vert
+	$(GLSL_VALIDATOR) -V shader.vert
+
+frag.spv: shader.frag
+	$(GLSL_VALIDATOR) -V shader.frag
+
+$(TARGET): main.c vert.spv frag.spv
+	gcc -ggdb -O0 -Wall -std=c99 \
+		-DCURRENT_DIR=\"`pwd`\" \
+		`pkg-config --libs --cflags xcb` \
+		-L $(VULKAN_SO_PATH) \
+		-l$(VULKAN_SO_NAME) \
+		-o $(TARGET) \
+		main.c
+
+clean:
+	rm -f $(TARGET) vert.spv frag.spv

vulkan-triangle/shader.frag

@@ -0,0 +1,9 @@
+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+layout(location = 0) out highp vec4 outColor;
+layout(location = 0) in vec3 color;
+
+void main() {
+   outColor = vec4(color, 1.0);
+}

vulkan-triangle/shader.vert

@@ -0,0 +1,25 @@
+#version 450
+#extension GL_ARB_separate_shader_objects : enable
+
+out gl_PerVertex {
+   vec4 gl_Position;
+};
+
+vec2 positions[3] = vec2[](
+   vec2( 0.0, -0.5),
+   vec2( 0.5,  0.5),
+   vec2(-0.5,  0.5)
+);
+
+vec3 colors[3] = vec3[] (
+   vec3(1.0, 0.0, 0.0),
+   vec3(0.0, 1.0, 0.0),
+   vec3(0.0, 0.0, 1.0)
+);
+
+layout(location = 0) out vec3 color;
+
+void main() {
+   gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
+   color = colors[gl_VertexIndex];
+}