X-Git-Url: https://harrygodden.com/git/?a=blobdiff_plain;f=fishladder.c;h=2cd35291dafe2532d49037732b0353927e743be3;hb=8c0c078d020902e7a30a9cc01ab62e6bef80294a;hp=21df71c9713122eeb5b373191bb3d5b81547eb10;hpb=a2139aa4e0c3e4ac01cb3f3396abb6e21daed3e0;p=fishladder.git

diff --git a/fishladder.c b/fishladder.c
index 21df71c..2cd3529 100644
--- a/fishladder.c
+++ b/fishladder.c
@@ -3,6 +3,30 @@
 //#define VG_STEAM
 #include "vg/vg.h"
 
+SHADER_DEFINE( shader_tile_colour,
+
+	// VERTEX
+	"layout (location=0) in vec2 a_co;"
+	"uniform mat3 uPv;"
+	"uniform vec2 uOffset;"
+	""
+	"void main()"
+	"{"
+		"gl_Position = vec4( uPv * vec3( a_co + uOffset, 1.0 ), 1.0 );"
+	"}",
+	
+	// FRAGMENT
+	"out vec4 FragColor;"
+	"uniform vec4 uColour;"
+	""
+	"void main()"
+	"{"
+		"FragColor = uColour;"
+	"}"
+	,
+	UNIFORMS({ "uPv", "uOffset", "uColour" })
+)
+
 m3x3f m_projection;
 m3x3f m_view;
 m3x3f m_mdl;
@@ -16,18 +40,64 @@ struct world
 	*data;
 	
 	u32 w, h;
-};
+	
+	GLuint tile_vao;
+	GLuint tile_vbo;
+} world = { .w = 1, .h = 1 };
 
 int main( int argc, char *argv[] )
 {
 	vg_init( argc, argv, "FishLadder" );
 }
 
-void vg_register(void){}
-void vg_start(void){}
-void vg_free(void){}
+void vg_register(void)
+{
+	SHADER_INIT( shader_tile_colour );
+}
 
-void vg_update(void){}
+void vg_start(void)
+{
+	glGenVertexArrays( 1, &world.tile_vao );
+	glGenBuffers( 1, &world.tile_vbo );
+	
+	float quad_mesh[] =
+	{
+		0.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
+		0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f
+	};
+	
+	glBindVertexArray( world.tile_vao );
+	glBindBuffer( GL_ARRAY_BUFFER, world.tile_vbo );
+	glBufferData
+	(
+		GL_ARRAY_BUFFER,
+		sizeof( quad_mesh ),
+		quad_mesh,
+		GL_STATIC_DRAW
+	);
+	
+	glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void*)0 );
+	glEnableVertexAttribArray( 0 );
+	
+	VG_CHECK_GL();	
+}
+
+void vg_free(void)
+{
+	glDeleteVertexArrays( 1, &world.tile_vao );
+	glDeleteBuffers( 1, &world.tile_vbo );
+}
+
+void vg_update(void)
+{
+	float ratio = (float)vg_window_y / (float)vg_window_x;
+	float const size = 7.5f;
+	
+	m3x3_projection( m_projection, -size, size, size*ratio, -size*ratio );
+	m3x3_identity( m_view );
+	m3x3_mul( m_projection, m_view, vg_pv );
+	vg_projection_update();
+}
 
 void vg_render(void)
 {
@@ -36,6 +106,20 @@ void vg_render(void)
 	glDisable( GL_DEPTH_TEST );
 	glClearColor( 0.01f, 0.01f, 0.01f, 1.0f );
 	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+	
+	glBindVertexArray( world.tile_vao );
+	SHADER_USE( shader_tile_colour );
+	glUniformMatrix3fv( SHADER_UNIFORM( shader_tile_colour, "uPv" ), 1, GL_FALSE, (float *)vg_pv );
+	
+	for( int y = 0; y < world.h; y ++ )
+	{
+		for( int x = 0; x < world.w; x ++ )
+		{
+			glUniform2f( SHADER_UNIFORM( shader_tile_colour, "uOffset" ), (float)x, (float)y );
+			glUniform4f( SHADER_UNIFORM( shader_tile_colour, "uColour" ), 1.0f, 1.0f, 1.0f, 1.0f );
+			glDrawArrays( GL_TRIANGLES, 0, 6 );
+		}
+	}
 }
 
 void vg_ui(void){}
\ No newline at end of file