[canvas/surface cleanup]

- properly destroy gl canvas backend
- properly destroy gl surface

examples/win_canvas/main.c

@@ -238,6 +238,8 @@ int main()
 		frameTime = mp_get_time(MP_CLOCK_MONOTONIC) - startTime;
 	}
 
+	mg_canvas_destroy(canvas);
+	mg_surface_destroy(surface);
 	mp_terminate();
 
 	return(0);

src/gl_canvas.c

@@ -17,19 +17,20 @@ typedef struct mg_gl_canvas_backend
 	mg_canvas_backend interface;
 	mg_surface surface;
 
-	GLint dummyVertexBuffer;
-	GLint vertexBuffer;
-	GLint shapeBuffer;
-	GLint indexBuffer;
-	GLint tileCounterBuffer;
-	GLint tileArrayBuffer;
-	GLint clearCounterProgram;
-	GLint tileProgram;
-	GLint sortProgram;
-	GLint drawProgram;
-	GLint blitProgram;
+	GLuint vao;
+	GLuint dummyVertexBuffer;
+	GLuint vertexBuffer;
+	GLuint shapeBuffer;
+	GLuint indexBuffer;
+	GLuint tileCounterBuffer;
+	GLuint tileArrayBuffer;
+	GLuint clearCounterProgram;
+	GLuint tileProgram;
+	GLuint sortProgram;
+	GLuint drawProgram;
+	GLuint blitProgram;
 
-	GLint outTexture;
+	GLuint outTexture;
 
 	char* indexMapping;
 	char* vertexMapping;
@@ -255,7 +256,21 @@ void mg_gl_canvas_destroy(mg_canvas_backend* interface)
 {
 	mg_gl_canvas_backend* backend = (mg_gl_canvas_backend*)interface;
 
-	//TODO
+	glDeleteTextures(1, &backend->outTexture);
+
+	glDeleteBuffers(1, &backend->dummyVertexBuffer);
+	glDeleteBuffers(1, &backend->vertexBuffer);
+	glDeleteBuffers(1, &backend->shapeBuffer);
+	glDeleteBuffers(1, &backend->indexBuffer);
+	glDeleteBuffers(1, &backend->tileCounterBuffer);
+	glDeleteBuffers(1, &backend->tileArrayBuffer);
+
+	glDeleteVertexArrays(1, &backend->vao);
+
+	free(backend->shapeMapping);
+	free(backend->vertexMapping);
+	free(backend->indexMapping);
+	free(backend);
 }
 
 void mg_gl_canvas_atlas_upload(mg_canvas_backend* interface, mp_rect rect, u8* bytes)
@@ -391,9 +406,8 @@ mg_canvas_backend* mg_gl_canvas_create(mg_surface surface)
 
 		mg_surface_prepare(surface);
 
-		GLuint vao;
-		glGenVertexArrays(1, &vao);
-		glBindVertexArray(vao);
+		glGenVertexArrays(1, &backend->vao);
+		glBindVertexArray(backend->vao);
 
 		glGenBuffers(1, &backend->dummyVertexBuffer);
 		glBindBuffer(GL_ARRAY_BUFFER, backend->dummyVertexBuffer);
@@ -444,10 +458,7 @@ mg_canvas_backend* mg_gl_canvas_create(mg_surface surface)
 
 		if(err)
 		{
-			free(backend->shapeMapping);
-			free(backend->vertexMapping);
-			free(backend->indexMapping);
-			free(backend);
+			mg_gl_canvas_destroy((mg_canvas_backend*)backend);
 			backend = 0;
 		}
 		else

src/win32_gl_loader.h

@@ -37,6 +37,8 @@
 	GL_PROC(GLBINDBUFFER, glBindBuffer) \
 	GL_PROC(GLBUFFERDATA, glBufferData) \
 	GL_PROC(GLBUFFERSUBDATA, glBufferSubData) \
+	GL_PROC(GLDELETEVERTEXARRAYS, glDeleteVertexArrays) \
+	GL_PROC(GLDELETEBUFFERS, glDeleteBuffers) \
 	GL_PROC(GLUNIFORMMATRIX4FV, glUniformMatrix4fv) \
 	GL_PROC(GLVERTEXATTRIBPOINTER, glVertexAttribPointer) \
 	GL_PROC(GLENABLEVERTEXATTRIBARRAY, glEnableVertexAttribArray) \

src/win32_gl_surface.c

@@ -26,7 +26,13 @@ typedef struct mg_gl_surface
 void mg_gl_surface_destroy(mg_surface_data* interface)
 {
 	mg_gl_surface* surface = (mg_gl_surface*)interface;
-	//TODO
+
+	if(surface->glContext == wglGetCurrentContext())
+	{
+		wglMakeCurrent(NULL, NULL);
+	}
+	wglDeleteContext(surface->glContext);
+	free(surface);
 }
 
 void mg_gl_surface_prepare(mg_surface_data* interface)

todo.txt

@@ -3,7 +3,8 @@ Overview
 --------
 [x] Pan/Zoom on text example
 [.] Clean+Fixes of canvas code and examples
-[ ] Make backend selection easier
+
+[>] Make backend selection easier
 
 [ ] Image API and backend
 	[ ] Build image atlas on top
@@ -12,14 +13,15 @@ Overview
 [ ] Allow different versions of GL to co-exist
 [?] Backport canvas to GLES
 
+[ ] Back surface by child windows and implement moving frame/hiding/overlay
+
 [ ] Delegated drawing API+Impl
 
 Clean+Fixes
 -----------
 
 [x] Rename MG_GL_CANVAS_TILE_ARRAY_SIZE/LENGTH unambiguously and make it consistent between C and glsl code
-
-[.] Clean shaders (folder/filenames, version string, debug flags, ...)
+[x] Clean shaders (folder/filenames, version string, debug flags, ...)
 	[x] Simplify shader names, prefix embedded strings by "glsl_"
 	[x] Extract shader compilation in a function
 	[x] Add version strings/common structs in canvas code (maybe revisit later when we have multiple versions, but ok for now)
@@ -28,6 +30,10 @@ Clean+Fixes
 [x] Clean-up context on error and return nil handle
 	[/] Could return non-nil "invalid" handle and set error flags in handle
 
+[x] Destroy canvas backend properly
+[x] Destroy surface properly
+[ ] Destroy window properly
+
 [>] Make surface backend and canvas backend compile-time and run-time selections easier
 
 [ ] GL loader: allow using different GL versions (eg using a desktop GL surface and a GLES surface in the same app).